Adding upstream version 1.16.10.upstream/1.16.10upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

694 files changed, 31279 insertions, 0 deletions

diff --git a/src/cmd/go/testdata/addmod.go b/src/cmd/go/testdata/addmod.go
new file mode 100644
index 0000000..09fc8e7
--- /dev/null
+++ b/src/cmd/go/testdata/addmod.go
@@ -0,0 +1,154 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// Addmod adds a module as a txtar archive to the testdata/mod directory.
+//
+// Usage:
+//
+//	go run addmod.go path@version...
+//
+// It should only be used for very small modules - we do not want to check
+// very large files into testdata/mod.
+//
+// It is acceptable to edit the archive afterward to remove or shorten files.
+// See mod/README for more information.
+//
+package main
+
+import (
+	"bytes"
+	"flag"
+	"fmt"
+	"io/fs"
+	"log"
+	"os"
+	exec "internal/execabs"
+	"path/filepath"
+	"strings"
+
+	"cmd/go/internal/txtar"
+)
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: go run addmod.go path@version...\n")
+	os.Exit(2)
+}
+
+var tmpdir string
+
+func fatalf(format string, args ...interface{}) {
+	os.RemoveAll(tmpdir)
+	log.Fatalf(format, args...)
+}
+
+const goCmd = "go"
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+	if flag.NArg() == 0 {
+		usage()
+	}
+
+	log.SetPrefix("addmod: ")
+	log.SetFlags(0)
+
+	var err error
+	tmpdir, err = os.MkdirTemp("", "addmod-")
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	run := func(command string, args ...string) string {
+		cmd := exec.Command(command, args...)
+		cmd.Dir = tmpdir
+		var stderr bytes.Buffer
+		cmd.Stderr = &stderr
+		out, err := cmd.Output()
+		if err != nil {
+			fatalf("%s %s: %v\n%s", command, strings.Join(args, " "), err, stderr.Bytes())
+		}
+		return string(out)
+	}
+
+	gopath := strings.TrimSpace(run("go", "env", "GOPATH"))
+	if gopath == "" {
+		fatalf("cannot find GOPATH")
+	}
+
+	exitCode := 0
+	for _, arg := range flag.Args() {
+		if err := os.WriteFile(filepath.Join(tmpdir, "go.mod"), []byte("module m\n"), 0666); err != nil {
+			fatalf("%v", err)
+		}
+		run(goCmd, "get", "-d", arg)
+		path := arg
+		if i := strings.Index(path, "@"); i >= 0 {
+			path = path[:i]
+		}
+		out := run(goCmd, "list", "-m", "-f={{.Path}} {{.Version}} {{.Dir}}", path)
+		f := strings.Fields(out)
+		if len(f) != 3 {
+			log.Printf("go list -m %s: unexpected output %q", arg, out)
+			exitCode = 1
+			continue
+		}
+		path, vers, dir := f[0], f[1], f[2]
+		mod, err := os.ReadFile(filepath.Join(gopath, "pkg/mod/cache/download", path, "@v", vers+".mod"))
+		if err != nil {
+			log.Printf("%s: %v", arg, err)
+			exitCode = 1
+			continue
+		}
+		info, err := os.ReadFile(filepath.Join(gopath, "pkg/mod/cache/download", path, "@v", vers+".info"))
+		if err != nil {
+			log.Printf("%s: %v", arg, err)
+			exitCode = 1
+			continue
+		}
+
+		a := new(txtar.Archive)
+		title := arg
+		if !strings.Contains(arg, "@") {
+			title += "@" + vers
+		}
+		a.Comment = []byte(fmt.Sprintf("module %s\n\n", title))
+		a.Files = []txtar.File{
+			{Name: ".mod", Data: mod},
+			{Name: ".info", Data: info},
+		}
+		dir = filepath.Clean(dir)
+		err = filepath.WalkDir(dir, func(path string, info fs.DirEntry, err error) error {
+			if !info.Type().IsRegular() {
+				return nil
+			}
+			name := info.Name()
+			if name == "go.mod" || strings.HasSuffix(name, ".go") {
+				data, err := os.ReadFile(path)
+				if err != nil {
+					return err
+				}
+				a.Files = append(a.Files, txtar.File{Name: strings.TrimPrefix(path, dir+string(filepath.Separator)), Data: data})
+			}
+			return nil
+		})
+		if err != nil {
+			log.Printf("%s: %v", arg, err)
+			exitCode = 1
+			continue
+		}
+
+		data := txtar.Format(a)
+		target := filepath.Join("mod", strings.ReplaceAll(path, "/", "_")+"_"+vers+".txt")
+		if err := os.WriteFile(target, data, 0666); err != nil {
+			log.Printf("%s: %v", arg, err)
+			exitCode = 1
+			continue
+		}
+	}
+	os.RemoveAll(tmpdir)
+	os.Exit(exitCode)
+}
diff --git a/src/cmd/go/testdata/failssh/ssh b/src/cmd/go/testdata/failssh/ssh
new file mode 100755
index 0000000..ecdbef9
--- /dev/null
+++ b/src/cmd/go/testdata/failssh/ssh
@@ -0,0 +1,2 @@
+#!/bin/sh
+exit 1
diff --git a/src/cmd/go/testdata/mod/README b/src/cmd/go/testdata/mod/README
new file mode 100644
index 0000000..43ddf77
--- /dev/null
+++ b/src/cmd/go/testdata/mod/README
@@ -0,0 +1,36 @@
+This directory holds Go modules served by a Go module proxy
+that runs on localhost during tests, both to make tests avoid
+requiring specific network servers and also to make them 
+significantly faster.
+
+A small go get'able test module can be added here by running
+
+	cd cmd/go/testdata
+	go run addmod.go path@vers
+
+where path and vers are the module path and version to add here.
+
+For interactive experimentation using this set of modules, run:
+
+	cd cmd/go
+	go test -proxy=localhost:1234 &
+	export GOPROXY=http://localhost:1234/mod
+
+and then run go commands as usual.
+
+Modules saved to this directory should be small: a few kilobytes at most.
+It is acceptable to edit the archives created by addmod.go to remove
+or shorten files. It is also acceptable to write module archives by hand: 
+they need not be backed by some public git repo.
+
+Each module archive is named path_vers.txt, where slashes in path
+have been replaced with underscores. The archive must contain
+two files ".info" and ".mod", to be served as the info and mod files
+in the proxy protocol (see https://research.swtch.com/vgo-module).
+The remaining files are served as the content of the module zip file.
+The path@vers prefix required of files in the zip file is added
+automatically by the proxy: the files in the archive have names without
+the prefix, like plain "go.mod", "x.go", and so on.
+
+See ../addmod.go and ../savedir.go for tools to generate txtar files,
+although again it is also fine to write them by hand.
diff --git a/src/cmd/go/testdata/mod/example.com_ambiguous_a_b_v0.0.0-empty.txt b/src/cmd/go/testdata/mod/example.com_ambiguous_a_b_v0.0.0-empty.txt
new file mode 100644
index 0000000..a869519
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_ambiguous_a_b_v0.0.0-empty.txt
@@ -0,0 +1,12 @@
+Module example.com/ambiguous/a/b is a suffix of example.com/a.
+This version contains no package.
+-- .mod --
+module example.com/ambiguous/a/b
+
+go 1.16
+-- .info --
+{"Version":"v0.0.0-empty"}
+-- go.mod --
+module example.com/ambiguous/a/b
+
+go 1.16
diff --git a/src/cmd/go/testdata/mod/example.com_ambiguous_a_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_ambiguous_a_v1.0.0.txt
new file mode 100644
index 0000000..bb43826
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_ambiguous_a_v1.0.0.txt
@@ -0,0 +1,18 @@
+Module example.com/ambiguous/a is a prefix of example.com/a/b.
+It contains package example.com/a/b.
+-- .mod --
+module example.com/ambiguous/a
+
+go 1.16
+
+require example.com/ambiguous/a/b v0.0.0-empty
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.com/ambiguous/a
+
+go 1.16
+
+require example.com/ambiguous/a/b v0.0.0-empty
+-- b/b.go --
+package b
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_a_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_a_v1.0.0.txt
new file mode 100644
index 0000000..d7bf647
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_a_v1.0.0.txt
@@ -0,0 +1,12 @@
+example.com/badchain/a v1.0.0
+
+-- .mod --
+module example.com/badchain/a
+
+require example.com/badchain/b v1.0.0
+-- .info --
+{"Version":"v1.0.0"}
+-- a.go --
+package a
+
+import _ "example.com/badchain/b"
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_a_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_a_v1.1.0.txt
new file mode 100644
index 0000000..92190d8
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_a_v1.1.0.txt
@@ -0,0 +1,12 @@
+example.com/badchain/a v1.1.0
+
+-- .mod --
+module example.com/badchain/a
+
+require example.com/badchain/b v1.1.0
+-- .info --
+{"Version":"v1.1.0"}
+-- a.go --
+package a
+
+import _ "example.com/badchain/b"
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_b_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_b_v1.0.0.txt
new file mode 100644
index 0000000..d42b8aa
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_b_v1.0.0.txt
@@ -0,0 +1,12 @@
+example.com/badchain/b v1.0.0
+
+-- .mod --
+module example.com/badchain/b
+
+require example.com/badchain/c v1.0.0
+-- .info --
+{"Version":"v1.0.0"}
+-- b.go --
+package b
+
+import _ "example.com/badchain/c"
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_b_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_b_v1.1.0.txt
new file mode 100644
index 0000000..6648184
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_b_v1.1.0.txt
@@ -0,0 +1,12 @@
+example.com/badchain/b v1.1.0
+
+-- .mod --
+module example.com/badchain/b
+
+require example.com/badchain/c v1.1.0
+-- .info --
+{"Version":"v1.1.0"}
+-- b.go --
+package b
+
+import _ "example.com/badchain/c"
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_c_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_c_v1.0.0.txt
new file mode 100644
index 0000000..9c717cb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_c_v1.0.0.txt
@@ -0,0 +1,8 @@
+example.com/badchain/c v1.0.0
+
+-- .mod --
+module example.com/badchain/c
+-- .info --
+{"Version":"v1.0.0"}
+-- c.go --
+package c
diff --git a/src/cmd/go/testdata/mod/example.com_badchain_c_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_badchain_c_v1.1.0.txt
new file mode 100644
index 0000000..36bc2c6
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_badchain_c_v1.1.0.txt
@@ -0,0 +1,8 @@
+example.com/badchain/c v1.1.0
+
+-- .mod --
+module badchain.example.com/c
+-- .info --
+{"Version":"v1.1.0"}
+-- c.go --
+package c
diff --git a/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-exclude.txt b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-exclude.txt
new file mode 100644
index 0000000..c883d8a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-exclude.txt
@@ -0,0 +1,28 @@
+example.com/cmd contains main packages.
+
+-- .info --
+{"Version":"v1.0.0-exclude"}
+-- .mod --
+module example.com/cmd
+
+go 1.16
+
+exclude rsc.io/quote v1.5.2
+-- go.mod --
+module example.com/cmd
+
+go 1.16
+
+exclude rsc.io/quote v1.5.2
+-- a/a.go --
+package main
+
+func main() {}
+-- b/b.go --
+package main
+
+func main() {}
+-- err/err.go --
+package err
+
+var X = DoesNotCompile
diff --git a/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-newerself.txt b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-newerself.txt
new file mode 100644
index 0000000..7670f29
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-newerself.txt
@@ -0,0 +1,28 @@
+example.com/cmd contains main packages.
+
+-- .info --
+{"Version":"v1.0.0-newerself"}
+-- .mod --
+module example.com/cmd
+
+go 1.16
+
+require example.com/cmd v1.0.0
+-- go.mod --
+module example.com/cmd
+
+go 1.16
+
+require example.com/cmd v1.0.0
+-- a/a.go --
+package main
+
+func main() {}
+-- b/b.go --
+package main
+
+func main() {}
+-- err/err.go --
+package err
+
+var X = DoesNotCompile
diff --git a/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-replace.txt b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-replace.txt
new file mode 100644
index 0000000..581a496
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0-replace.txt
@@ -0,0 +1,28 @@
+example.com/cmd contains main packages.
+
+-- .info --
+{"Version":"v1.0.0-replace"}
+-- .mod --
+module example.com/cmd
+
+go 1.16
+
+replace rsc.io/quote => rsc.io/quote v1.5.2
+-- go.mod --
+module example.com/cmd
+
+go 1.16
+
+replace rsc.io/quote => rsc.io/quote v1.5.2
+-- a/a.go --
+package main
+
+func main() {}
+-- b/b.go --
+package main
+
+func main() {}
+-- err/err.go --
+package err
+
+var X = DoesNotCompile
diff --git a/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0.txt
new file mode 100644
index 0000000..ee43938
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_cmd_v1.0.0.txt
@@ -0,0 +1,27 @@
+example.com/cmd contains main packages.
+
+v1.0.0 is the latest non-retracted version. Other versions contain errors or
+detectable problems.
+
+-- .info --
+{"Version":"v1.0.0"}
+-- .mod --
+module example.com/cmd
+
+go 1.16
+-- go.mod --
+module example.com/cmd
+
+go 1.16
+-- a/a.go --
+package main
+
+func main() {}
+-- b/b.go --
+package main
+
+func main() {}
+-- err/err.go --
+package err
+
+var X = DoesNotCompile
diff --git a/src/cmd/go/testdata/mod/example.com_cmd_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_cmd_v1.9.0.txt
new file mode 100644
index 0000000..9298afb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_cmd_v1.9.0.txt
@@ -0,0 +1,30 @@
+example.com/cmd contains main packages.
+
+-- .info --
+{"Version":"v1.9.0"}
+-- .mod --
+module example.com/cmd
+
+go 1.16
+
+// this is a bad version
+retract v1.9.0
+-- go.mod --
+module example.com/cmd
+
+go 1.16
+
+// this is a bad version
+retract v1.9.0
+-- a/a.go --
+package main
+
+func main() {}
+-- b/b.go --
+package main
+
+func main() {}
+-- err/err.go --
+package err
+
+var X = DoesNotCompile
diff --git a/src/cmd/go/testdata/mod/example.com_dotgo.go_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_dotgo.go_v1.0.0.txt
new file mode 100644
index 0000000..4f7f4d7
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_dotgo.go_v1.0.0.txt
@@ -0,0 +1,16 @@
+This module's path ends with ".go".
+Based on github.com/nats-io/nats.go.
+Used in regression tests for golang.org/issue/32483.
+
+-- .mod --
+module example.com/dotgo.go
+
+go 1.13
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.com/dotgo.go
+
+go 1.13
+-- dotgo.go --
+package dotgo
diff --git a/src/cmd/go/testdata/mod/example.com_downgrade_v2.0.0.txt b/src/cmd/go/testdata/mod/example.com_downgrade_v2.0.0.txt
new file mode 100644
index 0000000..88d50e5
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_downgrade_v2.0.0.txt
@@ -0,0 +1,9 @@
+example.com/downgrade v2.0.0
+written by hand
+
+-- .mod --
+module example.com/downgrade
+
+require rsc.io/quote v1.5.2
+-- .info --
+{"Version":"v2.0.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_downgrade_v2_v2.0.1.txt b/src/cmd/go/testdata/mod/example.com_downgrade_v2_v2.0.1.txt
new file mode 100644
index 0000000..a4d665f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_downgrade_v2_v2.0.1.txt
@@ -0,0 +1,13 @@
+example.com/downgrade/v2 v2.0.1
+written by hand
+
+-- .mod --
+module example.com/downgrade/v2
+
+require rsc.io/quote v1.5.2
+-- .info --
+{"Version":"v2.0.1"}
+-- go.mod --
+module example.com/downgrade/v2
+
+require rsc.io/quote v1.5.2
diff --git a/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v1.0.0.txt
new file mode 100644
index 0000000..435578d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v1.0.0.txt
@@ -0,0 +1,8 @@
+Module example.com/incompatiblewithsub has an incompatible version
+and a package in a subdirectory.
+-- .info --
+{"Version":"v1.0.0"}
+-- .mod --
+module example.com/incompatiblewithsub
+-- sub/sub.go --
+package sub
diff --git a/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v2.0.0+incompatible.txt b/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v2.0.0+incompatible.txt
new file mode 100644
index 0000000..198ec17
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_incompatiblewithsub_v2.0.0+incompatible.txt
@@ -0,0 +1,8 @@
+Module example.com/incompatiblewithsub has an incompatible version
+and a package in a subdirectory.
+-- .info --
+{"Version":"v2.0.0+incompatible"}
+-- .mod --
+module example.com/incompatiblewithsub
+-- sub/sub.go --
+package sub
diff --git a/src/cmd/go/testdata/mod/example.com_invalidpath_v1_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_invalidpath_v1_v1.0.0.txt
new file mode 100644
index 0000000..7d9d130
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_invalidpath_v1_v1.0.0.txt
@@ -0,0 +1,13 @@
+example.com/invalidpath/v1 v1.0.0
+written by hand
+
+-- .mod --
+module example.com/invalidpath/v1
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.com/invalidpath/v1
+-- version.go --
+package version
+
+const V = "v1.0.0"
diff --git a/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.0.0.txt
new file mode 100644
index 0000000..1ecfa0b
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.0.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for package moved into a parent module.
+
+-- .mod --
+module example.com/join/subpkg
+-- .info --
+{"Version": "v1.0.0"}
+-- x.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.1.0.txt
new file mode 100644
index 0000000..9eb823a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_join_subpkg_v1.1.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for package moved into a parent module.
+
+-- .mod --
+module example.com/join/subpkg
+
+require example.com/join v1.1.0
+-- .info --
+{"Version": "v1.1.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_join_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_join_v1.0.0.txt
new file mode 100644
index 0000000..84c68b1
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_join_v1.0.0.txt
@@ -0,0 +1,7 @@
+Written by hand.
+Test case for package moved into a parent module.
+
+-- .mod --
+module example.com/join
+-- .info --
+{"Version": "v1.0.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_join_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_join_v1.1.0.txt
new file mode 100644
index 0000000..5f92036
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_join_v1.1.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for package moved into a parent module.
+
+-- .mod --
+module example.com/join
+-- .info --
+{"Version": "v1.1.0"}
+-- subpkg/x.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.0.txt b/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.0.txt
new file mode 100644
index 0000000..25bd3d9
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.0.txt
@@ -0,0 +1,14 @@
+example.com/latemigrate/v2 v2.0.0
+written by hand
+
+This repository migrated to modules in v2.0.1 after v2.0.0 was already tagged.
+All versions require rsc.io/quote so we can test downgrades.
+
+v2.0.0 is technically part of example.com/latemigrate as v2.0.0+incompatible.
+Proxies may serve it as part of the version list for example.com/latemigrate/v2.
+'go get' must be able to ignore these versions.
+
+-- .mod --
+module example.com/latemigrate
+-- .info --
+{"Version":"v2.0.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.1.txt b/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.1.txt
new file mode 100644
index 0000000..be427a3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_latemigrate_v2_v2.0.1.txt
@@ -0,0 +1,20 @@
+example.com/latemigrate/v2 v2.0.1
+written by hand
+
+This repository migrated to modules in v2.0.1 after v2.0.0 was already tagged.
+All versions require rsc.io/quote so we can test downgrades.
+
+v2.0.1 belongs to example.com/latemigrate/v2.
+
+-- .mod --
+module example.com/latemigrate/v2
+
+require rsc.io/quote v1.3.0
+-- .info --
+{"Version":"v2.0.1"}
+-- go.mod --
+module example.com/latemigrate/v2
+
+require rsc.io/quote v1.3.0
+-- late.go --
+package late
diff --git a/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.0.txt
new file mode 100644
index 0000000..15f3f69
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.0.txt
@@ -0,0 +1,11 @@
+The deprecated package is present in this version (which is @latest) but
+is deleted in a newer prerelease version.
+
+-- .mod --
+module example.com/missingpkg
+-- .info --
+{"Version":"v1.0.0"}
+-- lib.go --
+package lib
+-- deprecated/deprecated.go --
+package deprecated
diff --git a/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.1-beta.txt b/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.1-beta.txt
new file mode 100644
index 0000000..44580fe
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_missingpkg_v1.0.1-beta.txt
@@ -0,0 +1,8 @@
+The deprecated package is deleted in this version.
+
+-- .mod --
+module example.com/missingpkg
+-- .info --
+{"Version":"v1.0.1-beta"}
+-- lib.go --
+package lib
diff --git a/src/cmd/go/testdata/mod/example.com_nest_sub_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_nest_sub_v1.0.0.txt
new file mode 100644
index 0000000..90f1459
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_nest_sub_v1.0.0.txt
@@ -0,0 +1,12 @@
+Written by hand.
+Test case for nested modules without an explicit relationship.
+This is nested below the top-level module.
+
+-- .mod --
+module example.com/nest/sub
+-- .info --
+{"Version": "v1.0.0"}
+-- go.mod --
+module example.com/nest/sub
+-- y/y.go --
+package y
diff --git a/src/cmd/go/testdata/mod/example.com_nest_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_nest_v1.0.0.txt
new file mode 100644
index 0000000..593caf1
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_nest_v1.0.0.txt
@@ -0,0 +1,12 @@
+Written by hand.
+Test case for nested modules without an explicit relationship.
+This is the top-level module.
+
+-- .mod --
+module example.com/nest
+-- .info --
+{"Version": "v1.0.0"}
+-- go.mod --
+module example.com/nest
+-- sub/x/x.go --
+package x
diff --git a/src/cmd/go/testdata/mod/example.com_nest_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_nest_v1.1.0.txt
new file mode 100644
index 0000000..5a01550
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_nest_v1.1.0.txt
@@ -0,0 +1,12 @@
+Written by hand.
+Test case for nested modules without an explicit relationship.
+This is the top-level module.
+
+-- .mod --
+module example.com/nest
+-- .info --
+{"Version": "v1.1.0"}
+-- go.mod --
+module example.com/nest
+-- sub/x/x.go --
+package x
diff --git a/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.0.txt
new file mode 100644
index 0000000..829065d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.0.txt
@@ -0,0 +1,10 @@
+example.com/newcycle/a v1.0.0
+
+Transitively requires v1.0.1 of itself via example.com/newcycle/b
+
+-- .mod --
+module example.com/newcycle/a
+
+require example.com/newcycle/b v1.0.0
+-- .info --
+{"Version":"v1.0.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.1.txt b/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.1.txt
new file mode 100644
index 0000000..a03f4b4
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_newcycle_a_v1.0.1.txt
@@ -0,0 +1,10 @@
+example.com/newcycle/a v1.0.1
+
+Transitively requires itself via example.com/newcycle/b
+
+-- .mod --
+module example.com/newcycle/a
+
+require example.com/newcycle/b v1.0.0
+-- .info --
+{"Version":"v1.0.1"}
diff --git a/src/cmd/go/testdata/mod/example.com_newcycle_b_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_newcycle_b_v1.0.0.txt
new file mode 100644
index 0000000..ff9e1f5
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_newcycle_b_v1.0.0.txt
@@ -0,0 +1,8 @@
+example.com/newcycle/b v1.0.0
+
+-- .mod --
+module example.com/newcycle/b
+
+require example.com/newcycle/a v1.0.1
+-- .info --
+{"Version":"v1.0.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_noroot_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_noroot_v1.0.0.txt
new file mode 100644
index 0000000..aa5febf
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_noroot_v1.0.0.txt
@@ -0,0 +1,8 @@
+A module which has no root package.
+
+-- .mod --
+module example.com/noroot
+-- .info --
+{"Version":"v1.0.0"}
+-- pkg/pkg.go --
+package pkg
diff --git a/src/cmd/go/testdata/mod/example.com_noroot_v1.0.1.txt b/src/cmd/go/testdata/mod/example.com_noroot_v1.0.1.txt
new file mode 100644
index 0000000..9b93717
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_noroot_v1.0.1.txt
@@ -0,0 +1,8 @@
+A module which has no root package.
+
+-- .mod --
+module example.com/noroot
+-- .info --
+{"Version":"v1.0.1"}
+-- pkg/pkg.go --
+package pkg
diff --git a/src/cmd/go/testdata/mod/example.com_notags_v0.0.0-20190507143103-cc8cbe209b64.txt b/src/cmd/go/testdata/mod/example.com_notags_v0.0.0-20190507143103-cc8cbe209b64.txt
new file mode 100644
index 0000000..259774d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_notags_v0.0.0-20190507143103-cc8cbe209b64.txt
@@ -0,0 +1,9 @@
+Written by hand.
+The "latest" version of a module without any tags.
+
+-- .mod --
+module example.com/notags
+-- .info --
+{"Version":"v0.0.0-20190507143103-cc8cbe209b64","Time":"2019-05-07T07:31:03-07:00"}
+-- notags.go --
+package notags
diff --git a/src/cmd/go/testdata/mod/example.com_printversion_v0.1.0.txt b/src/cmd/go/testdata/mod/example.com_printversion_v0.1.0.txt
new file mode 100644
index 0000000..606322a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_printversion_v0.1.0.txt
@@ -0,0 +1,33 @@
+example.com/printversion v0.1.0
+
+-- .mod --
+module example.com/printversion
+-- .info --
+{"Version":"v0.1.0"}
+-- README.txt --
+There is no go.mod file for this version of the module.
+-- printversion.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+
+	_ "example.com/version"
+)
+
+func main() {
+	info, _ := debug.ReadBuildInfo()
+	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
+	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
+	if r := info.Main.Replace; r != nil {
+		fmt.Fprintf(os.Stdout, "\t(replaced by %s %s)\n", r.Path, r.Version)
+	}
+	for _, m := range info.Deps {
+		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
+		if r := m.Replace; r != nil {
+			fmt.Fprintf(os.Stdout, "\t(replaced by %s %s)\n", r.Path, r.Version)
+		}
+	}
+}
diff --git a/src/cmd/go/testdata/mod/example.com_printversion_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_printversion_v1.0.0.txt
new file mode 100644
index 0000000..b9b71e9
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_printversion_v1.0.0.txt
@@ -0,0 +1,41 @@
+example.com/printversion v1.0.0
+
+-- .mod --
+module example.com/printversion
+
+require example.com/version v1.0.0
+replace example.com/version v1.0.0 => ../oops v0.0.0
+exclude example.com/version v1.1.0
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.com/printversion
+
+require example.com/version v1.0.0
+replace example.com/version v1.0.0 => ../oops v0.0.0
+exclude example.com/version v1.0.1
+-- printversion.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+
+	_ "example.com/version"
+)
+
+func main() {
+	info, _ := debug.ReadBuildInfo()
+	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
+	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
+	if r := info.Main.Replace; r != nil {
+		fmt.Fprintf(os.Stdout, "\t(replaced by %s %s)\n", r.Path, r.Version)
+	}
+	for _, m := range info.Deps {
+		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
+		if r := m.Replace; r != nil {
+			fmt.Fprintf(os.Stdout, "\t(replaced by %s %s)\n", r.Path, r.Version)
+		}
+	}
+}
diff --git a/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.0.0-20190430073000-30950c05d534.txt b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.0.0-20190430073000-30950c05d534.txt
new file mode 100644
index 0000000..047ceb6
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.0.0-20190430073000-30950c05d534.txt
@@ -0,0 +1,13 @@
+example.com/pseudoupgrade v0.0.0-20190429073000-30950c05d534
+written by hand
+
+-- .mod --
+module example.com/pseudoupgrade
+
+-- .info --
+{"Version":"v0.0.0-20190430073000-30950c05d534","Name":"v0.0.0-20190430073000-30950c05d534","Short":"30950c05d534","Time":"2019-04-30T07:30:00Z"}
+
+-- pseudoupgrade.go --
+package pseudoupgrade
+
+const X = 1
diff --git a/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.0.txt b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.0.txt
new file mode 100644
index 0000000..7ddb0dc
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.0.txt
@@ -0,0 +1,13 @@
+example.com/pseudoupgrade v0.1.0
+written by hand
+
+-- .mod --
+module example.com/pseudoupgrade
+
+-- .info --
+{"Version":"v0.1.0","Name":"","Short":"","Time":"2019-04-29T07:30:30Z"}
+
+-- pseudoupgrade.go --
+package pseudoupgrade
+
+const X = 1
diff --git a/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.1-0.20190429073117-b5426c86b553.txt b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.1-0.20190429073117-b5426c86b553.txt
new file mode 100644
index 0000000..b3f48bb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_pseudoupgrade_v0.1.1-0.20190429073117-b5426c86b553.txt
@@ -0,0 +1,13 @@
+example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553
+written by hand
+
+-- .mod --
+module example.com/pseudoupgrade
+
+-- .info --
+{"Version":"v0.1.1-0.20190429073117-b5426c86b553","Name":"v0.1.1-0.20190429073117-b5426c86b553","Short":"b5426c86b553","Time":"2019-04-29T07:31:00Z"}
+
+-- pseudoupgrade.go --
+package pseudoupgrade
+
+const X = 1
diff --git a/src/cmd/go/testdata/mod/example.com_quote_v1.5.2.txt b/src/cmd/go/testdata/mod/example.com_quote_v1.5.2.txt
new file mode 100644
index 0000000..05f7ae2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_quote_v1.5.2.txt
@@ -0,0 +1,9 @@
+This module is a replacement for rsc.io/quote, but its go.mod file declares
+a module path different from its location and the original module.
+
+-- .mod --
+module rsc.io/Quote
+
+go 1.14
+-- .info --
+{"Version":"v1.5.2"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_ambiguous_nested_v1.9.0-bad.txt b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_nested_v1.9.0-bad.txt
new file mode 100644
index 0000000..f8e623d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_nested_v1.9.0-bad.txt
@@ -0,0 +1,10 @@
+-- .mod --
+module example.com/retract/ambiguous/nested
+
+go 1.16
+
+retract v1.9.0-bad // nested modules are bad
+-- .info --
+{"Version":"v1.9.0-bad"}
+-- nested.go --
+package nested
diff --git a/src/cmd/go/testdata/mod/example.com_retract_ambiguous_other_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_other_v1.0.0.txt
new file mode 100644
index 0000000..5ee0139
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_other_v1.0.0.txt
@@ -0,0 +1,12 @@
+-- .mod --
+module example.com/retract/ambiguous/other
+
+go 1.16
+
+require example.com/retract/ambiguous v1.0.0
+-- .info --
+{"Version":"v1.0.0"}
+-- other.go --
+package other
+
+import _ "example.com/retract/ambiguous/nested"
diff --git a/src/cmd/go/testdata/mod/example.com_retract_ambiguous_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_v1.0.0.txt
new file mode 100644
index 0000000..c8eeb16
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_ambiguous_v1.0.0.txt
@@ -0,0 +1,9 @@
+-- .mod --
+module example.com/retract/ambiguous
+
+go 1.16
+-- .info --
+{"Version":"v1.0.0"}
+-- nested/nested.go --
+package nested
+
diff --git a/src/cmd/go/testdata/mod/example.com_retract_incompatible_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_retract_incompatible_v1.0.0.txt
new file mode 100644
index 0000000..a987685
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_incompatible_v1.0.0.txt
@@ -0,0 +1,19 @@
+The v1.0.0 release of example.com/retract/incompatible retracts
+v2.0.0+incompatible.
+
+-- .mod --
+module example.com/retract/incompatible
+
+go 1.16
+
+retract v2.0.0+incompatible
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.com/retract/incompatible
+
+go 1.16
+
+retract v2.0.0+incompatible
+-- incompatible.go --
+package incompatible
diff --git a/src/cmd/go/testdata/mod/example.com_retract_incompatible_v2.0.0+incompatible.txt b/src/cmd/go/testdata/mod/example.com_retract_incompatible_v2.0.0+incompatible.txt
new file mode 100644
index 0000000..c668dbb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_incompatible_v2.0.0+incompatible.txt
@@ -0,0 +1,9 @@
+The v1.0.0 release of example.com/retract/incompatible retracts
+v2.0.0+incompatible.
+
+-- .mod --
+module example.com/retract/incompatible
+-- .info --
+{"Version":"v2.0.0+incompatible"}
+-- incompatible.go --
+package incompatible
diff --git a/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.0.0.txt
new file mode 100644
index 0000000..1d8d810
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.0.0.txt
@@ -0,0 +1,10 @@
+This version should be retracted, but the go.mod file for the version that would
+contain the retraction is not available.
+-- .mod --
+module example.com/retract/missingmod
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0"}
+-- missingmod.go --
+package missingmod
diff --git a/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.9.0.txt
new file mode 100644
index 0000000..bba919e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_missingmod_v1.9.0.txt
@@ -0,0 +1,4 @@
+The go.mod file at this version will be loaded to check for retractions
+of earlier versions. However, the .mod file is not available.
+-- .info --
+{"Version":"v1.9.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-block.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-block.txt
new file mode 100644
index 0000000..c4a53e1
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-block.txt
@@ -0,0 +1,6 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-block"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-blockwithcomment.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-blockwithcomment.txt
new file mode 100644
index 0000000..92573b6
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-blockwithcomment.txt
@@ -0,0 +1,6 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-blockwithcomment"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-empty.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-empty.txt
new file mode 100644
index 0000000..1f0894a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-empty.txt
@@ -0,0 +1,8 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-empty"}
+-- empty.go --
+package empty
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-long.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-long.txt
new file mode 100644
index 0000000..1b5e753
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-long.txt
@@ -0,0 +1,8 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-long"}
+-- empty.go --
+package empty
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline1.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline1.txt
new file mode 100644
index 0000000..b1ffe27
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline1.txt
@@ -0,0 +1,8 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-multiline1"}
+-- empty.go --
+package empty
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline2.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline2.txt
new file mode 100644
index 0000000..72f80b3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-multiline2.txt
@@ -0,0 +1,8 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-multiline2"}
+-- empty.go --
+package empty
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-order.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-order.txt
new file mode 100644
index 0000000..1b04504
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-order.txt
@@ -0,0 +1,6 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-order"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-unprintable.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-unprintable.txt
new file mode 100644
index 0000000..9496124
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.0-unprintable.txt
@@ -0,0 +1,8 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0-unprintable"}
+-- empty.go --
+package empty
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.1-order.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.1-order.txt
new file mode 100644
index 0000000..3be7d5b
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.0.1-order.txt
@@ -0,0 +1,6 @@
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+-- .info --
+{"Version":"v1.0.1-order"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.9.0.txt
new file mode 100644
index 0000000..6975d4e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rationale_v1.9.0.txt
@@ -0,0 +1,48 @@
+Module example.com/retract/description retracts all versions of itself.
+The rationale comments have various problems.
+
+-- .mod --
+module example.com/retract/rationale
+
+go 1.14
+
+retract (
+	v1.0.0-empty
+
+	// short description
+	// more
+	//
+	// detail
+	v1.0.0-multiline1 // suffix
+	// after not included
+)
+
+// short description
+// more
+//
+// detail
+retract v1.0.0-multiline2 // suffix
+
+// loooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooooong
+retract v1.0.0-long
+
+// Ends with a BEL character. Beep!
+retract v1.0.0-unprintable
+
+// block comment
+retract (
+	v1.0.0-block
+
+	// inner comment
+	v1.0.0-blockwithcomment
+)
+
+retract (
+	[v1.0.0-order, v1.0.0-order] // degenerate range
+	v1.0.0-order // single version
+
+	v1.0.1-order // single version
+	[v1.0.1-order, v1.0.1-order] // degenerate range
+)
+-- .info --
+{"Version":"v1.9.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rename_v1.0.0-bad.txt b/src/cmd/go/testdata/mod/example.com_retract_rename_v1.0.0-bad.txt
new file mode 100644
index 0000000..25c4ff1
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rename_v1.0.0-bad.txt
@@ -0,0 +1,16 @@
+Module example.com/retract/rename is renamed in a later version.
+
+This happens frequently when a repository is renamed or when a go.mod file
+is added for the first time with a custom module path.
+-- .info --
+{"Version":"v1.0.0-bad"}
+-- .mod --
+module example.com/retract/rename
+
+go 1.16
+-- go.mod --
+module example.com/retract/rename
+
+go 1.16
+-- rename.go --
+package rename
diff --git a/src/cmd/go/testdata/mod/example.com_retract_rename_v1.9.0-new.txt b/src/cmd/go/testdata/mod/example.com_retract_rename_v1.9.0-new.txt
new file mode 100644
index 0000000..9c08f71
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_rename_v1.9.0-new.txt
@@ -0,0 +1,22 @@
+Module example.com/retract/rename is renamed in this version.
+
+This happens frequently when a repository is renamed or when a go.mod file
+is added for the first time with a custom module path.
+-- .info --
+{"Version":"v1.9.0-new"}
+-- .mod --
+module example.com/retract/newname
+
+go 1.16
+
+// bad
+retract v1.0.0-bad
+-- go.mod --
+module example.com/retract/newname
+
+go 1.16
+
+// bad
+retract v1.0.0-bad
+-- newname.go --
+package newname
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_all_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_all_v1.9.0.txt
new file mode 100644
index 0000000..4dc486b
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_all_v1.9.0.txt
@@ -0,0 +1,14 @@
+Module example.com/retract/self/prev is a module that retracts its own
+latest version.
+
+No unretracted versions are available.
+
+-- .mod --
+module example.com/retract/self/all
+
+go 1.15
+
+retract v1.9.0 // bad
+
+-- .info --
+{"Version":"v1.9.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.0.0.txt
new file mode 100644
index 0000000..04c2845
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.0.0.txt
@@ -0,0 +1,16 @@
+Module example.com/retract/self/prerelease is a module that retracts its own
+latest version and all other release version.
+
+A pre-release version higher than the highest release version is still
+available, and that should be matched by @latest.
+
+-- .mod --
+module example.com/retract/self/prerelease
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.0.txt
new file mode 100644
index 0000000..7c1c047
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.0.txt
@@ -0,0 +1,19 @@
+Module example.com/retract/self/prerelease is a module that retracts its own
+latest version and all other release version.
+
+A pre-release version higher than the highest release version is still
+available, and that should be matched by @latest.
+
+-- .mod --
+module example.com/retract/self/prerelease
+
+go 1.15
+
+retract v1.0.0 // bad
+retract v1.9.0 // self
+
+-- .info --
+{"Version":"v1.9.0"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.1-pre.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.1-pre.txt
new file mode 100644
index 0000000..abf44fd
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prerelease_v1.9.1-pre.txt
@@ -0,0 +1,16 @@
+Module example.com/retract/self/prerelease is a module that retracts its own
+latest version and all other release version.
+
+A pre-release version higher than the highest release version is still
+available, and that should be matched by @latest.
+
+-- .mod --
+module example.com/retract/self/prerelease
+
+go 1.15
+
+-- .info --
+{"Version":"v1.9.1-pre"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.0.0-bad.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.0.0-bad.txt
new file mode 100644
index 0000000..095063d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.0.0-bad.txt
@@ -0,0 +1,14 @@
+See example.com_retract_self_prev_v1.9.0.txt.
+
+This version is retracted.
+
+-- .mod --
+module example.com/retract/self/prev
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0-bad"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.1.0.txt
new file mode 100644
index 0000000..27c3a39
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.1.0.txt
@@ -0,0 +1,14 @@
+See example.com_retract_self_pref_v1.9.0.txt.
+
+This version is the latest (only) non-retracted version.
+
+-- .mod --
+module example.com/retract/self/prev
+
+go 1.15
+
+-- .info --
+{"Version":"v1.1.0"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.9.0.txt
new file mode 100644
index 0000000..03d6168
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_prev_v1.9.0.txt
@@ -0,0 +1,18 @@
+Module example.com/retract/self/prev is a module that retracts its own
+latest version, as well as an earlier version.
+
+A previous unretracted release version, v1.1.0, is still available.
+
+-- .mod --
+module example.com/retract/self/prev
+
+go 1.15
+
+retract v1.0.0-bad // bad
+retract v1.9.0 // self
+
+-- .info --
+{"Version":"v1.9.0"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v0.0.0-20200325131415-0123456789ab b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v0.0.0-20200325131415-0123456789ab
new file mode 100644
index 0000000..f9ab41e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v0.0.0-20200325131415-0123456789ab
@@ -0,0 +1,20 @@
+See example.com_retract_self_pseudo_v1.9.0.txt.
+
+This version is not retracted. It should be returned by the proxy's
+@latest endpoint. It should match the @latest version query.
+
+TODO(golang.org/issue/24031): the proxy and proxy.golang.org both return
+the highest release version from the @latest endpoint, even if that
+version is retracted, so there is no way for the go command to
+discover an unretracted pseudo-version.
+
+-- .mod --
+module example.com/retract/self/pseudo
+
+go 1.15
+
+-- .info --
+{"Version":"v0.0.0-20200325131415-01234567890ab"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.0.0-bad.txt b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.0.0-bad.txt
new file mode 100644
index 0000000..d47eda0
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.0.0-bad.txt
@@ -0,0 +1,14 @@
+See example.com_retract_self_pseudo_v1.9.0.txt.
+
+This version is retracted.
+
+-- .mod --
+module example.com/retract/self/pseudo
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0-bad"}
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.9.0.txt b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.9.0.txt
new file mode 100644
index 0000000..db09cc6
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_self_pseudo_v1.9.0.txt
@@ -0,0 +1,16 @@
+Module example.com/retract/self/pseudo is a module that retracts its own
+latest version, as well as an earlier version.
+
+An unretracted pseudo-version is available.
+
+-- .mod --
+module example.com/retract/self/pseudo
+
+go 1.15
+
+retract v1.0.0-bad // bad
+retract v1.9.0 // self
+
+-- .info --
+{"Version":"v1.9.0"}
+
diff --git a/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-bad.txt b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-bad.txt
new file mode 100644
index 0000000..2f996cf
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-bad.txt
@@ -0,0 +1,10 @@
+-- .mod --
+module example.com/retract
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0-bad"}
+
+-- retract.go --
+package retract
diff --git a/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-good.txt b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-good.txt
new file mode 100644
index 0000000..78152bb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-good.txt
@@ -0,0 +1,10 @@
+-- .mod --
+module example.com/retract
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0-good"}
+
+-- retract.go --
+package retract
diff --git a/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-unused.txt b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-unused.txt
new file mode 100644
index 0000000..3bc9e35
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_v1.0.0-unused.txt
@@ -0,0 +1,10 @@
+-- .mod --
+module example.com/retract
+
+go 1.15
+
+-- .info --
+{"Version":"v1.0.0-unused"}
+
+-- retract.go --
+package retract
diff --git a/src/cmd/go/testdata/mod/example.com_retract_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_retract_v1.1.0.txt
new file mode 100644
index 0000000..18d6d83
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_retract_v1.1.0.txt
@@ -0,0 +1,13 @@
+-- .mod --
+module example.com/retract
+
+go 1.15
+
+retract v1.0.0-bad // bad
+retract v1.0.0-unused // bad
+
+-- .info --
+{"Version":"v1.1.0"}
+
+-- retract.go --
+package retract
diff --git a/src/cmd/go/testdata/mod/example.com_split-incompatible_subpkg_v0.1.0.txt b/src/cmd/go/testdata/mod/example.com_split-incompatible_subpkg_v0.1.0.txt
new file mode 100644
index 0000000..8f9e491
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split-incompatible_subpkg_v0.1.0.txt
@@ -0,0 +1,14 @@
+Written by hand.
+Test case for getting a package that has been moved to a nested module,
+with a +incompatible verison (and thus no go.mod file) at the root module.
+
+-- .mod --
+module example.com/split-incompatible/subpkg
+-- .info --
+{"Version": "v0.1.0"}
+-- go.mod --
+module example.com/split-incompatible/subpkg
+
+go 1.16
+-- subpkg.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.0.0+incompatible.txt b/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.0.0+incompatible.txt
new file mode 100644
index 0000000..35c3f27
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.0.0+incompatible.txt
@@ -0,0 +1,10 @@
+Written by hand.
+Test case for getting a package that has been moved to a nested module,
+with a +incompatible verison (and thus no go.mod file) at the root module.
+
+-- .mod --
+module example.com/split-incompatible
+-- .info --
+{"Version": "v2.0.0+incompatible"}
+-- subpkg/subpkg.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.1.0-pre+incompatible.txt b/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.1.0-pre+incompatible.txt
new file mode 100644
index 0000000..917fc0f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split-incompatible_v2.1.0-pre+incompatible.txt
@@ -0,0 +1,10 @@
+Written by hand.
+Test case for getting a package that has been moved to a nested module,
+with a +incompatible verison (and thus no go.mod file) at the root module.
+
+-- .mod --
+module example.com/split-incompatible
+-- .info --
+{"Version": "v2.1.0-pre+incompatible"}
+-- README.txt --
+subpkg has moved to module example.com/split-incompatible/subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_split_subpkg_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_split_subpkg_v1.1.0.txt
new file mode 100644
index 0000000..b197b66
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split_subpkg_v1.1.0.txt
@@ -0,0 +1,11 @@
+Written by hand.
+Test case for getting a package that has been moved to a different module.
+
+-- .mod --
+module example.com/split/subpkg
+
+require example.com/split v1.1.0
+-- .info --
+{"Version": "v1.1.0"}
+-- x.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_split_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_split_v1.0.0.txt
new file mode 100644
index 0000000..b706e59
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split_v1.0.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for getting a package that has been moved to a different module.
+
+-- .mod --
+module example.com/split
+-- .info --
+{"Version": "v1.0.0"}
+-- subpkg/x.go --
+package subpkg
diff --git a/src/cmd/go/testdata/mod/example.com_split_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_split_v1.1.0.txt
new file mode 100644
index 0000000..d38971f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_split_v1.1.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for getting a package that has been moved to a different module.
+
+-- .mod --
+module example.com/split
+
+require example.com/split/subpkg v1.1.0
+-- .info --
+{"Version": "v1.1.0"}
diff --git a/src/cmd/go/testdata/mod/example.com_stack_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_stack_v1.0.0.txt
new file mode 100644
index 0000000..787b7ae
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_stack_v1.0.0.txt
@@ -0,0 +1,18 @@
+Module with a function that prints file name for the top stack frame.
+Different versions of this module are identical, but they should return
+different file names with -trimpath.
+-- .mod --
+module example.com/stack
+
+go 1.14
+-- .info --
+{"Version":"v1.0.0"}
+-- stack.go --
+package stack
+
+import "runtime"
+
+func TopFile() string {
+	_, file, _, _ := runtime.Caller(0)
+	return file
+}
diff --git a/src/cmd/go/testdata/mod/example.com_stack_v1.0.1.txt b/src/cmd/go/testdata/mod/example.com_stack_v1.0.1.txt
new file mode 100644
index 0000000..c715dd2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_stack_v1.0.1.txt
@@ -0,0 +1,18 @@
+Module with a function that prints file name for the top stack frame.
+Different versions of this module are identical, but they should return
+different file names with -trimpath.
+-- .mod --
+module example.com/stack
+
+go 1.14
+-- .info --
+{"Version":"v1.0.1"}
+-- stack.go --
+package stack
+
+import "runtime"
+
+func TopFile() string {
+	_, file, _, _ := runtime.Caller(0)
+	return file
+}
diff --git a/src/cmd/go/testdata/mod/example.com_tools_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_tools_v1.0.0.txt
new file mode 100644
index 0000000..22e36b9
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_tools_v1.0.0.txt
@@ -0,0 +1,12 @@
+-- .info --
+{"Version": "v1.0.0"}
+-- .mod --
+module example.com/tools
+-- cmd/hello/hello.go --
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello")
+}
diff --git a/src/cmd/go/testdata/mod/example.com_usemissingpre_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_usemissingpre_v1.0.0.txt
new file mode 100644
index 0000000..5e1c5c8
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_usemissingpre_v1.0.0.txt
@@ -0,0 +1,13 @@
+This module requires example.com/missingpkg at a prerelease version, which
+is newer than @latest.
+
+-- .mod --
+module example.com/usemissingpre
+
+require example.com/missingpkg v1.0.1-beta
+-- .info --
+{"Version":"v1.0.0"}
+-- use.go --
+package use
+
+import _ "example.com/missingpkg"
diff --git a/src/cmd/go/testdata/mod/example.com_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_v1.0.0.txt
new file mode 100644
index 0000000..263287d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_v1.0.0.txt
@@ -0,0 +1,9 @@
+Written by hand.
+Test case for module at root of domain.
+
+-- .mod --
+module example.com
+-- .info --
+{"Version": "v1.0.0"}
+-- x.go --
+package x
diff --git a/src/cmd/go/testdata/mod/example.com_version_v1.0.0.txt b/src/cmd/go/testdata/mod/example.com_version_v1.0.0.txt
new file mode 100644
index 0000000..d8c45b5
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_version_v1.0.0.txt
@@ -0,0 +1,11 @@
+example.com/version v1.0.0
+written by hand
+
+-- .mod --
+module example.com/version
+-- .info --
+{"Version":"v1.0.0"}
+-- version.go --
+package version
+
+const V = "v1.0.0"
diff --git a/src/cmd/go/testdata/mod/example.com_version_v1.0.1.txt b/src/cmd/go/testdata/mod/example.com_version_v1.0.1.txt
new file mode 100644
index 0000000..3bfdb0e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_version_v1.0.1.txt
@@ -0,0 +1,11 @@
+example.com/version v1.0.1
+written by hand
+
+-- .mod --
+module example.com/version
+-- .info --
+{"Version":"v1.0.1"}
+-- version.go --
+package version
+
+const V = "v1.0.1"
diff --git a/src/cmd/go/testdata/mod/example.com_version_v1.1.0.txt b/src/cmd/go/testdata/mod/example.com_version_v1.1.0.txt
new file mode 100644
index 0000000..8109a9a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.com_version_v1.1.0.txt
@@ -0,0 +1,11 @@
+example.com/version v1.1.0
+written by hand
+
+-- .mod --
+module example.com/version
+-- .info --
+{"Version":"v1.1.0"}
+-- version.go --
+package version
+
+const V = "v1.1.0"
diff --git a/src/cmd/go/testdata/mod/example.net_ambiguous_nested_v0.1.0.txt b/src/cmd/go/testdata/mod/example.net_ambiguous_nested_v0.1.0.txt
new file mode 100644
index 0000000..8c9de7a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_ambiguous_nested_v0.1.0.txt
@@ -0,0 +1,19 @@
+Written by hand.
+
+Test module containing a package that is also provided by a nested module tagged
+with the same version.
+
+-- .mod --
+module example.net/ambiguous/nested
+
+go 1.16
+-- .info --
+{"Version": "v0.1.0"}
+-- go.mod --
+module example.net/ambiguous/nested
+
+go 1.16
+-- pkg/pkg.go --
+// Package pkg exists in both example.net/ambiguous v0.1.0
+// and example.net/ambiguous/nested v0.1.0
+package pkg
diff --git a/src/cmd/go/testdata/mod/example.net_ambiguous_v0.1.0.txt b/src/cmd/go/testdata/mod/example.net_ambiguous_v0.1.0.txt
new file mode 100644
index 0000000..8fa6d83
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_ambiguous_v0.1.0.txt
@@ -0,0 +1,19 @@
+Written by hand.
+
+Test module containing a package that is also provided by a nested module tagged
+with the same version.
+
+-- .mod --
+module example.net/ambiguous
+
+go 1.16
+-- .info --
+{"Version": "v0.1.0"}
+-- go.mod --
+module example.net/ambiguous
+
+go 1.16
+-- nested/pkg/pkg.go --
+// Package pkg exists in both example.net/ambiguous v0.1.0
+// and example.net/ambiguous/nested v0.1.0
+package pkg
diff --git a/src/cmd/go/testdata/mod/example.net_ambiguous_v0.2.0.txt b/src/cmd/go/testdata/mod/example.net_ambiguous_v0.2.0.txt
new file mode 100644
index 0000000..7589ad7
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_ambiguous_v0.2.0.txt
@@ -0,0 +1,18 @@
+Written by hand.
+
+Test module containing a package that is also provided by a nested module tagged
+with the same version.
+
+-- .mod --
+module example.net/ambiguous
+
+go 1.16
+-- .info --
+{"Version": "v0.2.0"}
+-- go.mod --
+module example.net/ambiguous
+
+go 1.16
+-- nested/pkg/README.txt --
+// Package pkg no longer exists in this module at v0.2.0.
+// Find it in module example.net/ambiguous/nested instead.
diff --git a/src/cmd/go/testdata/mod/example.net_pkgadded_v1.0.0.txt b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.0.0.txt
new file mode 100644
index 0000000..207e86a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.0.0.txt
@@ -0,0 +1,17 @@
+Written by hand.
+Test module with a root package added in v1.1.0
+and a subpackage added in v1.2.0.
+
+-- .mod --
+module example.net/pkgadded
+
+go 1.16
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module example.net/pkgadded
+
+go 1.16
+-- README.txt --
+We will add the package example.net/pkgadded in v1.1.0,
+and example.net/pkgadded/subpkg in v1.2.0.
diff --git a/src/cmd/go/testdata/mod/example.net_pkgadded_v1.1.0.txt b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.1.0.txt
new file mode 100644
index 0000000..1c88de2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.1.0.txt
@@ -0,0 +1,19 @@
+Written by hand.
+Test module with a root package added in v1.1.0
+and a subpackage added in v1.2.0.
+
+-- .mod --
+module example.net/pkgadded
+
+go 1.16
+-- .info --
+{"Version":"v1.1.0"}
+-- go.mod --
+module example.net/pkgadded
+
+go 1.16
+-- README.txt --
+We will add the package example.net/pkgadded/subpkg in v1.2.0.
+-- pkgadded.go --
+// Package pkgadded was added in v1.1.0.
+package pkgadded
diff --git a/src/cmd/go/testdata/mod/example.net_pkgadded_v1.2.0.txt b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.2.0.txt
new file mode 100644
index 0000000..922951a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/example.net_pkgadded_v1.2.0.txt
@@ -0,0 +1,20 @@
+Written by hand.
+Test module with a root package added in v1.1.0
+and a subpackage added in v1.2.0.
+
+-- .mod --
+module example.net/pkgadded
+
+go 1.16
+-- .info --
+{"Version":"v1.2.0"}
+-- go.mod --
+module example.net/pkgadded
+
+go 1.16
+-- pkgadded.go --
+// Package pkgadded was added in v1.1.0.
+package pkgadded
+-- subpkg/subpkg.go --
+// Package subpkg was added in v1.2.0.
+package subpkg
diff --git a/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.0.0-20190619020302-197a620e0c9a.txt b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.0.0-20190619020302-197a620e0c9a.txt
new file mode 100644
index 0000000..c2709c1
--- /dev/null
+++ b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.0.0-20190619020302-197a620e0c9a.txt
@@ -0,0 +1,10 @@
+module github.com/dmitshur-test/modtest5@v0.0.0-20190619020302-197a620e0c9a
+
+-- .mod --
+module github.com/dmitshur-test/modtest5
+-- .info --
+{"Version":"v0.0.0-20190619020302-197a620e0c9a","Time":"2019-06-18T19:03:02-07:00"}
+-- p.go --
+package p
+
+const v = 1
diff --git a/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.0.20190619023908-3da23a9deb9e.txt b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.0.20190619023908-3da23a9deb9e.txt
new file mode 100644
index 0000000..22e47f3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.0.20190619023908-3da23a9deb9e.txt
@@ -0,0 +1,10 @@
+module github.com/dmitshur-test/modtest5@v0.5.0-alpha.0.20190619023908-3da23a9deb9e
+
+-- .mod --
+module github.com/dmitshur-test/modtest5
+-- .info --
+{"Version":"v0.5.0-alpha.0.20190619023908-3da23a9deb9e","Time":"2019-06-18T19:39:08-07:00"}
+-- p.go --
+package p
+
+const v = 3
diff --git a/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.txt b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.txt
new file mode 100644
index 0000000..4f088cc
--- /dev/null
+++ b/src/cmd/go/testdata/mod/github.com_dmitshur-test_modtest5_v0.5.0-alpha.txt
@@ -0,0 +1,10 @@
+module github.com/dmitshur-test/modtest5@v0.5.0-alpha
+
+-- .mod --
+module github.com/dmitshur-test/modtest5
+-- .info --
+{"Version":"v0.5.0-alpha","Time":"2019-06-18T19:04:46-07:00"}
+-- p.go --
+package p
+
+const v = 2
diff --git a/src/cmd/go/testdata/mod/golang.org_notx_useinternal_v0.1.0.txt b/src/cmd/go/testdata/mod/golang.org_notx_useinternal_v0.1.0.txt
new file mode 100644
index 0000000..0420a1a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/golang.org_notx_useinternal_v0.1.0.txt
@@ -0,0 +1,13 @@
+written by hand — attempts to use a prohibited internal package
+(https://golang.org/s/go14internal)
+
+-- .mod --
+module golang.org/notx/useinternal
+-- .info --
+{"Version":"v0.1.0","Name":"","Short":"","Time":"2018-07-25T17:24:00Z"}
+-- go.mod --
+module golang.org/notx/useinternal
+-- useinternal.go --
+package useinternal
+
+import _ "golang.org/x/internal/subtle"
diff --git a/src/cmd/go/testdata/mod/golang.org_x_internal_v0.1.0.txt b/src/cmd/go/testdata/mod/golang.org_x_internal_v0.1.0.txt
new file mode 100644
index 0000000..5737e95
--- /dev/null
+++ b/src/cmd/go/testdata/mod/golang.org_x_internal_v0.1.0.txt
@@ -0,0 +1,43 @@
+written by hand — loosely derived from golang.org/x/crypto/internal/subtle,
+but splitting the internal package across a module boundary
+
+-- .mod --
+module golang.org/x/internal
+-- .info --
+{"Version":"v0.1.0","Name":"","Short":"","Time":"2018-07-25T17:24:00Z"}
+-- go.mod --
+module golang.org/x/internal
+-- subtle/aliasing.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build !appengine
+
+// This is a tiny version of golang.org/x/crypto/internal/subtle.
+
+package subtle
+
+import "unsafe"
+
+func AnyOverlap(x, y []byte) bool {
+	return len(x) > 0 && len(y) > 0 &&
+		uintptr(unsafe.Pointer(&x[0])) <= uintptr(unsafe.Pointer(&y[len(y)-1])) &&
+		uintptr(unsafe.Pointer(&y[0])) <= uintptr(unsafe.Pointer(&x[len(x)-1]))
+}
+-- subtle/aliasing_appengine.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build appengine
+
+package subtle
+
+import "reflect"
+
+func AnyOverlap(x, y []byte) bool {
+	return len(x) > 0 && len(y) > 0 &&
+		reflect.ValueOf(&x[0]).Pointer() <= reflect.ValueOf(&y[len(y)-1]).Pointer() &&
+		reflect.ValueOf(&y[0]).Pointer() <= reflect.ValueOf(&x[len(x)-1]).Pointer()
+}
diff --git a/src/cmd/go/testdata/mod/golang.org_x_text_v0.0.0-20170915032832-14c0d48ead0c.txt b/src/cmd/go/testdata/mod/golang.org_x_text_v0.0.0-20170915032832-14c0d48ead0c.txt
new file mode 100644
index 0000000..f4f50cd
--- /dev/null
+++ b/src/cmd/go/testdata/mod/golang.org_x_text_v0.0.0-20170915032832-14c0d48ead0c.txt
@@ -0,0 +1,47 @@
+written by hand - just enough to compile rsc.io/sampler, rsc.io/quote
+
+-- .mod --
+module golang.org/x/text
+-- .info --
+{"Version":"v0.0.0-20170915032832-14c0d48ead0c","Name":"v0.0.0-20170915032832-14c0d48ead0c","Short":"14c0d48ead0c","Time":"2017-09-15T03:28:32Z"}
+-- go.mod --
+module golang.org/x/text
+-- unused/unused.go --
+package unused
+-- language/lang.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This is a tiny version of golang.org/x/text.
+
+package language
+
+import "strings"
+
+type Tag string
+
+func Make(s string) Tag { return Tag(s) }
+
+func (t Tag) String() string { return string(t) }
+
+func NewMatcher(tags []Tag) Matcher { return &matcher{tags} }
+
+type Matcher interface {
+	Match(...Tag) (Tag, int, int)
+}
+
+type matcher struct {
+	tags []Tag
+}
+
+func (m *matcher) Match(prefs ...Tag) (Tag, int, int) {
+	for _, pref := range prefs {
+		for _, tag := range m.tags {
+			if tag == pref || strings.HasPrefix(string(pref), string(tag+"-")) || strings.HasPrefix(string(tag), string(pref+"-")) {
+				return tag, 0, 0
+			}
+		}
+	}
+	return m.tags[0], 0, 0
+}
diff --git a/src/cmd/go/testdata/mod/golang.org_x_text_v0.3.0.txt b/src/cmd/go/testdata/mod/golang.org_x_text_v0.3.0.txt
new file mode 100644
index 0000000..5561afa
--- /dev/null
+++ b/src/cmd/go/testdata/mod/golang.org_x_text_v0.3.0.txt
@@ -0,0 +1,47 @@
+written by hand - just enough to compile rsc.io/sampler, rsc.io/quote
+
+-- .mod --
+module golang.org/x/text
+-- .info --
+{"Version":"v0.3.0","Name":"","Short":"","Time":"2017-09-16T03:28:32Z"}
+-- go.mod --
+module golang.org/x/text
+-- unused/unused.go --
+package unused
+-- language/lang.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// This is a tiny version of golang.org/x/text.
+
+package language
+
+import "strings"
+
+type Tag string
+
+func Make(s string) Tag { return Tag(s) }
+
+func (t Tag) String() string { return string(t) }
+
+func NewMatcher(tags []Tag) Matcher { return &matcher{tags} }
+
+type Matcher interface {
+	Match(...Tag) (Tag, int, int)
+}
+
+type matcher struct {
+	tags []Tag
+}
+
+func (m *matcher) Match(prefs ...Tag) (Tag, int, int) {
+	for _, pref := range prefs {
+		for _, tag := range m.tags {
+			if tag == pref || strings.HasPrefix(string(pref), string(tag+"-")) || strings.HasPrefix(string(tag), string(pref+"-")) {
+				return tag, 0, 0
+			}
+		}
+	}
+	return m.tags[0], 0, 0
+}
diff --git a/src/cmd/go/testdata/mod/golang.org_x_useinternal_v0.1.0.txt b/src/cmd/go/testdata/mod/golang.org_x_useinternal_v0.1.0.txt
new file mode 100644
index 0000000..3fcba44
--- /dev/null
+++ b/src/cmd/go/testdata/mod/golang.org_x_useinternal_v0.1.0.txt
@@ -0,0 +1,13 @@
+written by hand — uses an internal package from another module
+(https://golang.org/s/go14internal)
+
+-- .mod --
+module golang.org/x/useinternal
+-- .info --
+{"Version":"v0.1.0","Name":"","Short":"","Time":"2018-07-25T17:24:00Z"}
+-- go.mod --
+module golang.org/x/useinternal
+-- useinternal.go --
+package useinternal
+
+import _ "golang.org/x/internal/subtle"
diff --git a/src/cmd/go/testdata/mod/gopkg.in_dummy.v2-unstable_v2.0.0.txt b/src/cmd/go/testdata/mod/gopkg.in_dummy.v2-unstable_v2.0.0.txt
new file mode 100644
index 0000000..f174159
--- /dev/null
+++ b/src/cmd/go/testdata/mod/gopkg.in_dummy.v2-unstable_v2.0.0.txt
@@ -0,0 +1,9 @@
+gopkg.in/dummy.v2-unstable v2.0.0
+written by hand
+
+-- .mod --
+module gopkg.in/dummy.v2-unstable
+-- .info --
+{"Version":"v2.0.0"}
+-- dummy.go --
+package dummy
diff --git a/src/cmd/go/testdata/mod/not-rsc.io_quote_v0.1.0-nomod.txt b/src/cmd/go/testdata/mod/not-rsc.io_quote_v0.1.0-nomod.txt
new file mode 100644
index 0000000..efff088
--- /dev/null
+++ b/src/cmd/go/testdata/mod/not-rsc.io_quote_v0.1.0-nomod.txt
@@ -0,0 +1,59 @@
+Constructed by hand.
+(derived from rsc.io/quote@e7a685a342, but without an explicit go.mod file.)
+
+-- .mod --
+module "not-rsc.io/quote"
+-- .info --
+{"Version":"v0.1.0-nomod","Time":"2018-02-14T00:51:33Z"}
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory. Share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.0.txt b/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.0.txt
new file mode 100644
index 0000000..40616c6
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.0.txt
@@ -0,0 +1,11 @@
+patch.example.com/depofdirectpatch v1.0.0
+written by hand
+
+-- .mod --
+module patch.example.com/depofdirectpatch
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module patch.example.com/depofdirectpatch
+-- depofdirectpatch.go --
+package depofdirectpatch
diff --git a/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.1.txt b/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.1.txt
new file mode 100644
index 0000000..e075028
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_depofdirectpatch_v1.0.1.txt
@@ -0,0 +1,11 @@
+patch.example.com/depofdirectpatch v1.0.1
+written by hand
+
+-- .mod --
+module patch.example.com/depofdirectpatch
+-- .info --
+{"Version":"v1.0.1"}
+-- go.mod --
+module patch.example.com/depofdirectpatch
+-- depofdirectpatch.go --
+package depofdirectpatch
diff --git a/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.0.txt b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.0.txt
new file mode 100644
index 0000000..1e775fb
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.0.txt
@@ -0,0 +1,21 @@
+patch.example.com/direct v1.0.0
+written by hand
+
+-- .mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+)
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+)
+-- direct.go --
+package direct
+
+import _ "patch.example.com/indirect"
diff --git a/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.1.txt b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.1.txt
new file mode 100644
index 0000000..64912b7
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.0.1.txt
@@ -0,0 +1,27 @@
+patch.example.com/direct v1.0.1
+written by hand
+
+-- .mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+	patch.example.com/depofdirectpatch v1.0.0
+)
+-- .info --
+{"Version":"v1.0.1"}
+-- go.mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+	patch.example.com/depofdirectpatch v1.0.0
+)
+-- direct.go --
+package direct
+
+import _ "patch.example.com/indirect"
+-- usedepofdirectpatch/unused.go --
+package usedepofdirectpatch
+
+import _ "patch.example.com/depofdirectpatch"
diff --git a/src/cmd/go/testdata/mod/patch.example.com_direct_v1.1.0.txt b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.1.0.txt
new file mode 100644
index 0000000..406e3b9
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_direct_v1.1.0.txt
@@ -0,0 +1,21 @@
+patch.example.com/direct v1.1.0
+written by hand
+
+-- .mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+)
+-- .info --
+{"Version":"v1.1.0"}
+-- go.mod --
+module patch.example.com/direct
+
+require (
+	patch.example.com/indirect v1.0.0
+)
+-- direct.go --
+package direct
+
+import _ "patch.example.com/indirect"
diff --git a/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.0.txt b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.0.txt
new file mode 100644
index 0000000..ea7f5e2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.0.txt
@@ -0,0 +1,11 @@
+patch.example.com/indirect v1.0.0
+written by hand
+
+-- .mod --
+module patch.example.com/indirect
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module patch.example.com/indirect
+-- direct.go --
+package indirect
diff --git a/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.1.txt b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.1.txt
new file mode 100644
index 0000000..8c6cf8e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.0.1.txt
@@ -0,0 +1,11 @@
+patch.example.com/indirect v1.0.1
+written by hand
+
+-- .mod --
+module patch.example.com/indirect
+-- .info --
+{"Version":"v1.0.1"}
+-- go.mod --
+module patch.example.com/indirect
+-- direct.go --
+package indirect
diff --git a/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.1.0.txt b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.1.0.txt
new file mode 100644
index 0000000..f7229d4
--- /dev/null
+++ b/src/cmd/go/testdata/mod/patch.example.com_indirect_v1.1.0.txt
@@ -0,0 +1,11 @@
+patch.example.com/indirect v1.1.0
+written by hand
+
+-- .mod --
+module patch.example.com/indirect
+-- .info --
+{"Version":"v1.1.0"}
+-- go.mod --
+module patch.example.com/indirect
+-- direct.go --
+package indirect
diff --git a/src/cmd/go/testdata/mod/rsc.io_!c!g!o_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_!c!g!o_v1.0.0.txt
new file mode 100644
index 0000000..6276147
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_!c!g!o_v1.0.0.txt
@@ -0,0 +1,19 @@
+rsc.io/CGO v1.0.0
+
+-- .mod --
+module rsc.io/CGO
+-- .info --
+{"Version":"v1.0.0","Name":"","Short":"","Time":"2018-08-01T18:23:45Z"}
+-- go.mod --
+module rsc.io/CGO
+-- cgo.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package CGO
+
+// #cgo CFLAGS: -I${SRCDIR}
+import "C"
+
+var V = 0
diff --git a/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.2.txt b/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.2.txt
new file mode 100644
index 0000000..21185c3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.2.txt
@@ -0,0 +1,88 @@
+rsc.io/QUOTE v1.5.2
+
+-- .mod --
+module rsc.io/QUOTE
+
+require rsc.io/quote v1.5.2
+-- .info --
+{"Version":"v1.5.2","Name":"","Short":"","Time":"2018-07-15T16:25:34Z"}
+-- go.mod --
+module rsc.io/QUOTE
+
+require rsc.io/quote v1.5.2
+-- QUOTE/quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// PACKAGE QUOTE COLLECTS LOUD SAYINGS.
+package QUOTE
+
+import (
+	"strings"
+
+	"rsc.io/quote"
+)
+
+// HELLO RETURNS A GREETING.
+func HELLO() string {
+	return strings.ToUpper(quote.Hello())
+}
+
+// GLASS RETURNS A USEFUL PHRASE FOR WORLD TRAVELERS.
+func GLASS() string {
+	return strings.ToUpper(quote.GLASS())
+}
+
+// GO RETURNS A GO PROVERB.
+func GO() string {
+	return strings.ToUpper(quote.GO())
+}
+
+// OPT RETURNS AN OPTIMIZATION TRUTH.
+func OPT() string {
+	return strings.ToUpper(quote.OPT())
+}
+-- QUOTE/quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package QUOTE
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHELLO(t *testing.T) {
+	hello := "HELLO, WORLD"
+	if out := HELLO(); out != hello {
+		t.Errorf("HELLO() = %q, want %q", out, hello)
+	}
+}
+
+func TestGLASS(t *testing.T) {
+	glass := "I CAN EAT GLASS AND IT DOESN'T HURT ME."
+	if out := GLASS(); out != glass {
+		t.Errorf("GLASS() = %q, want %q", out, glass)
+	}
+}
+
+func TestGO(t *testing.T) {
+	go1 := "DON'T COMMUNICATE BY SHARING MEMORY, SHARE MEMORY BY COMMUNICATING."
+	if out := GO(); out != go1 {
+		t.Errorf("GO() = %q, want %q", out, go1)
+	}
+}
+
+func TestOPT(t *testing.T) {
+	opt := "IF A PROGRAM IS TOO SLOW, IT MUST HAVE A LOOP."
+	if out := OPT(); out != opt {
+		t.Errorf("OPT() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.3-!p!r!e.txt b/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.3-!p!r!e.txt
new file mode 100644
index 0000000..54bac2d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_!q!u!o!t!e_v1.5.3-!p!r!e.txt
@@ -0,0 +1,88 @@
+rsc.io/QUOTE v1.5.3-PRE (sigh)
+
+-- .mod --
+module rsc.io/QUOTE
+
+require rsc.io/quote v1.5.2
+-- .info --
+{"Version":"v1.5.3-PRE","Name":"","Short":"","Time":"2018-07-15T16:25:34Z"}
+-- go.mod --
+module rsc.io/QUOTE
+
+require rsc.io/quote v1.5.2
+-- QUOTE/quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// PACKAGE QUOTE COLLECTS LOUD SAYINGS.
+package QUOTE
+
+import (
+	"strings"
+
+	"rsc.io/quote"
+)
+
+// HELLO RETURNS A GREETING.
+func HELLO() string {
+	return strings.ToUpper(quote.Hello())
+}
+
+// GLASS RETURNS A USEFUL PHRASE FOR WORLD TRAVELERS.
+func GLASS() string {
+	return strings.ToUpper(quote.GLASS())
+}
+
+// GO RETURNS A GO PROVERB.
+func GO() string {
+	return strings.ToUpper(quote.GO())
+}
+
+// OPT RETURNS AN OPTIMIZATION TRUTH.
+func OPT() string {
+	return strings.ToUpper(quote.OPT())
+}
+-- QUOTE/quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package QUOTE
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHELLO(t *testing.T) {
+	hello := "HELLO, WORLD"
+	if out := HELLO(); out != hello {
+		t.Errorf("HELLO() = %q, want %q", out, hello)
+	}
+}
+
+func TestGLASS(t *testing.T) {
+	glass := "I CAN EAT GLASS AND IT DOESN'T HURT ME."
+	if out := GLASS(); out != glass {
+		t.Errorf("GLASS() = %q, want %q", out, glass)
+	}
+}
+
+func TestGO(t *testing.T) {
+	go1 := "DON'T COMMUNICATE BY SHARING MEMORY, SHARE MEMORY BY COMMUNICATING."
+	if out := GO(); out != go1 {
+		t.Errorf("GO() = %q, want %q", out, go1)
+	}
+}
+
+func TestOPT(t *testing.T) {
+	opt := "IF A PROGRAM IS TOO SLOW, IT MUST HAVE A LOOP."
+	if out := OPT(); out != opt {
+		t.Errorf("OPT() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_badfile1_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badfile1_v1.0.0.txt
new file mode 100644
index 0000000..9d23e7d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badfile1_v1.0.0.txt
@@ -0,0 +1,14 @@
+rsc.io/badfile1 v1.0.0
+written by hand
+this is part of the badfile test but is a valid zip file.
+
+-- .mod --
+module rsc.io/badfile1
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module rsc.io/badfile1
+-- α.go --
+package α
+-- .gitignore --
+-- x/y/z/.gitignore --
diff --git a/src/cmd/go/testdata/mod/rsc.io_badfile2_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badfile2_v1.0.0.txt
new file mode 100644
index 0000000..58e1e1c
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badfile2_v1.0.0.txt
@@ -0,0 +1,12 @@
+rsc.io/badfile1 v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badfile2
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module rsc.io/badfile2
+-- ☺.go --
+package smiley
+
diff --git a/src/cmd/go/testdata/mod/rsc.io_badfile3_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badfile3_v1.0.0.txt
new file mode 100644
index 0000000..a008448
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badfile3_v1.0.0.txt
@@ -0,0 +1,12 @@
+rsc.io/badfile3 v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badfile3
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module rsc.io/badfile3
+-- x?y.go --
+package x
+
diff --git a/src/cmd/go/testdata/mod/rsc.io_badfile4_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badfile4_v1.0.0.txt
new file mode 100644
index 0000000..e28844d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badfile4_v1.0.0.txt
@@ -0,0 +1,15 @@
+rsc.io/badfile4 v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badfile4
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module rsc.io/badfile4
+-- x/Y.go --
+package x
+-- x/y.go --
+package x
+
+
diff --git a/src/cmd/go/testdata/mod/rsc.io_badfile5_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badfile5_v1.0.0.txt
new file mode 100644
index 0000000..3c7903a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badfile5_v1.0.0.txt
@@ -0,0 +1,13 @@
+rsc.io/badfile5 v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badfile5
+-- .info --
+{"Version":"v1.0.0"}
+-- go.mod --
+module rsc.io/badfile5
+-- x/y/z/w.go --
+package z
+-- x/Y/zz/ww.go --
+package zz
diff --git a/src/cmd/go/testdata/mod/rsc.io_badmod_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badmod_v1.0.0.txt
new file mode 100644
index 0000000..993ceb7
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badmod_v1.0.0.txt
@@ -0,0 +1,11 @@
+rsc.io/badmod v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badmod
+hello world
+-- .info --
+{"Version":"v1.0.0"}
+-- x.go --
+package x
+
diff --git a/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.0.txt
new file mode 100644
index 0000000..d62db26
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.0.txt
@@ -0,0 +1,14 @@
+rsc.io/badsum@v1.0.0
+
+This module would match the hard-coded hash for rsc.io/badsum v1.0.0
+in modfetch/notary.go if not for the "break hash" line.
+
+-- .mod --
+module "rsc.io/badsum"
+-- .info --
+{"Version":"v1.0.0","Time":"2018-02-14T00:45:20Z"}
+-- go.mod --
+module "rsc.io/badsum"
+-- badsum.go --
+package badsum
+// break hash
diff --git a/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.1.txt b/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.1.txt
new file mode 100644
index 0000000..5fea50a
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badsum_v1.0.1.txt
@@ -0,0 +1,14 @@
+rsc.io/badsum@v1.0.1
+
+This module would match the hard-coded hash for rsc.io/badsum v1.0.1/go.mod
+in modfetch/notary.go if not for the "break hash" line.
+
+-- .mod --
+module "rsc.io/badsum"
+# break hash
+-- .info --
+{"Version":"v1.0.1","Time":"2018-02-14T00:45:20Z"}
+-- go.mod --
+module "rsc.io/badsum"
+-- badsum.go --
+package badsum
diff --git a/src/cmd/go/testdata/mod/rsc.io_badzip_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_badzip_v1.0.0.txt
new file mode 100644
index 0000000..07a38fa
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_badzip_v1.0.0.txt
@@ -0,0 +1,11 @@
+rsc.io/badzip v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/badzip
+-- .info --
+{"Version":"v1.0.0"}
+-- x.go --
+package x
+-- /rsc.io/badzip@v1.0.0.txt --
+This file should not be here.
diff --git a/src/cmd/go/testdata/mod/rsc.io_breaker_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_breaker_v1.0.0.txt
new file mode 100644
index 0000000..a103e3f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_breaker_v1.0.0.txt
@@ -0,0 +1,11 @@
+rsc.io/breaker v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/breaker
+-- .info --
+{"Version":"v1.0.0"}
+-- breaker.go --
+package breaker
+
+const X = 1
diff --git a/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0+incompatible.txt b/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0+incompatible.txt
new file mode 100644
index 0000000..59d8bac
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0+incompatible.txt
@@ -0,0 +1,11 @@
+rsc.io/breaker v2.0.0+incompatible
+written by hand
+
+-- .mod --
+module rsc.io/breaker
+-- .info --
+{"Version":"v2.0.0+incompatible", "Name": "7307b307f4f0dde421900f8e5126fadac1e13aed", "Short": "7307b307f4f0"}
+-- breaker.go --
+package breaker
+
+const XX = 2
diff --git a/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0.txt
new file mode 100644
index 0000000..59d8bac
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_breaker_v2.0.0.txt
@@ -0,0 +1,11 @@
+rsc.io/breaker v2.0.0+incompatible
+written by hand
+
+-- .mod --
+module rsc.io/breaker
+-- .info --
+{"Version":"v2.0.0+incompatible", "Name": "7307b307f4f0dde421900f8e5126fadac1e13aed", "Short": "7307b307f4f0"}
+-- breaker.go --
+package breaker
+
+const XX = 2
diff --git a/src/cmd/go/testdata/mod/rsc.io_fortune_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_fortune_v1.0.0.txt
new file mode 100644
index 0000000..d8a71f3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_fortune_v1.0.0.txt
@@ -0,0 +1,15 @@
+rsc.io/fortune v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/fortune
+-- .info --
+{"Version":"v1.0.0"}
+-- fortune.go --
+package main
+
+import "rsc.io/quote"
+
+func main() {
+	println(quote.Hello())
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_fortune_v2_v2.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_fortune_v2_v2.0.0.txt
new file mode 100644
index 0000000..3acd637
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_fortune_v2_v2.0.0.txt
@@ -0,0 +1,21 @@
+rsc.io/fortune v2.0.0
+written by hand
+
+-- .mod --
+module rsc.io/fortune/v2
+-- .info --
+{"Version":"v2.0.0"}
+-- fortune.go --
+package main
+
+import "rsc.io/quote"
+
+func main() {
+	println(quote.Hello())
+}
+-- fortune_test.go --
+package main
+
+import "testing"
+
+func TestFortuneV2(t *testing.T) {}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005133-e7a685a342c0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005133-e7a685a342c0.txt
new file mode 100644
index 0000000..8ae173e
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005133-e7a685a342c0.txt
@@ -0,0 +1,60 @@
+rsc.io/quote@e7a685a342
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v0.0.0-20180214005133-e7a685a342c0","Name":"e7a685a342c001acc3eb7f5eafa82980480042c7","Short":"e7a685a342c0","Time":"2018-02-14T00:51:33Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory. Share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005840-23179ee8a569.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005840-23179ee8a569.txt
new file mode 100644
index 0000000..bc626ba
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180214005840-23179ee8a569.txt
@@ -0,0 +1,86 @@
+rsc.io/quote@v0.0.0-20180214005840-23179ee8a569
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180214005840-23179ee8a569","Name":"23179ee8a569bb05d896ae05c6503ec69a19f99f","Short":"23179ee8a569","Time":"2018-02-14T00:58:40Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180628003336-dd9747d19b04.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180628003336-dd9747d19b04.txt
new file mode 100644
index 0000000..bbc8097
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180628003336-dd9747d19b04.txt
@@ -0,0 +1,100 @@
+rsc.io/quote@dd9747d
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180628003336-dd9747d19b04","Name":"dd9747d19b041365fbddf0399ddba6bff5eb1b3e","Short":"dd9747d19b04","Time":"2018-06-28T00:33:36Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+AN EVEN WORSE CHANGE!
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709153244-fd906ed3b100.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709153244-fd906ed3b100.txt
new file mode 100644
index 0000000..e461ed4
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709153244-fd906ed3b100.txt
@@ -0,0 +1,86 @@
+rsc.io/quote@v2.0.0
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180709153244-fd906ed3b100","Name":"fd906ed3b100e47181ffa9ec36d82294525c9109","Short":"fd906ed3b100","Time":"2018-07-09T15:32:44Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func HelloV2() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func GlassV2() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func GoV2() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func OptV2() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709160352-0d003b9c4bfa.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709160352-0d003b9c4bfa.txt
new file mode 100644
index 0000000..c1d511f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709160352-0d003b9c4bfa.txt
@@ -0,0 +1,98 @@
+rsc.io/quote@v0.0.0-20180709160352-0d003b9c4bfa
+
+-- .mod --
+module rsc.io/quote
+
+require rsc.io/sampler v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180709160352-0d003b9c4bfa","Name":"0d003b9c4bfac881641be8eb1598b782a467a97f","Short":"0d003b9c4bfa","Time":"2018-07-09T16:03:52Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module rsc.io/quote
+
+require rsc.io/sampler v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/quote/v2"
+
+// Hello returns a greeting.
+func Hello() string {
+	return quote.HelloV2()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return quote.GlassV2()
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return quote.GoV2()
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return quote.OptV2()
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162749-b44a0b17b2d1.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162749-b44a0b17b2d1.txt
new file mode 100644
index 0000000..f7f794d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162749-b44a0b17b2d1.txt
@@ -0,0 +1,104 @@
+rsc.io/quote@v0.0.0-20180709162749-b44a0b17b2d1
+
+-- .mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v2 v2.0.1
+	rsc.io/sampler v1.3.0
+)
+-- .info --
+{"Version":"v0.0.0-20180709162749-b44a0b17b2d1","Name":"b44a0b17b2d1fe4c98a8d0e7a68c9bf9e762799a","Short":"b44a0b17b2d1","Time":"2018-07-09T16:27:49Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v2 v2.0.1
+	rsc.io/sampler v1.3.0
+)
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/quote/v2"
+
+// Hello returns a greeting.
+func Hello() string {
+	return quote.HelloV2()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return quote.GlassV2()
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return quote.GoV2()
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return quote.OptV2()
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162816-fe488b867524.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162816-fe488b867524.txt
new file mode 100644
index 0000000..2d5d8b4
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162816-fe488b867524.txt
@@ -0,0 +1,104 @@
+rsc.io/quote@v0.0.0-20180709162816-fe488b867524
+
+-- .mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v2 v2.0.1
+	rsc.io/sampler v1.3.0
+)
+-- .info --
+{"Version":"v0.0.0-20180709162816-fe488b867524","Name":"fe488b867524806e861c3f4f43ae6946a42ca3f1","Short":"fe488b867524","Time":"2018-07-09T16:28:16Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v2 v2.0.1
+	rsc.io/sampler v1.3.0
+)
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/quote/v2"
+
+// Hello returns a greeting.
+func Hello() string {
+	return quote.HelloV2()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return quote.GlassV2()
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return quote.GoV2()
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return quote.OptV2()
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162918-a91498bed0a7.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162918-a91498bed0a7.txt
new file mode 100644
index 0000000..853a8c2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180709162918-a91498bed0a7.txt
@@ -0,0 +1,98 @@
+rsc.io/quote@v0.0.0-20180709162918-a91498bed0a7
+
+-- .mod --
+module rsc.io/quote
+
+require rsc.io/sampler v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180709162918-a91498bed0a7","Name":"a91498bed0a73d4bb9c1fb2597925f7883bc40a7","Short":"a91498bed0a7","Time":"2018-07-09T16:29:18Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module rsc.io/quote
+
+require rsc.io/sampler v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/quote/v3"
+
+// Hello returns a greeting.
+func Hello() string {
+	return quote.HelloV3()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return quote.GlassV3()
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return quote.GoV3()
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return quote.OptV3()
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180710144737-5d9f230bcfba.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180710144737-5d9f230bcfba.txt
new file mode 100644
index 0000000..2ebeac3
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v0.0.0-20180710144737-5d9f230bcfba.txt
@@ -0,0 +1,104 @@
+rsc.io/quote@v0.0.0-20180710144737-5d9f230bcfba
+
+-- .mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v3 v3.0.0
+	rsc.io/sampler v1.3.0
+)
+-- .info --
+{"Version":"v0.0.0-20180710144737-5d9f230bcfba","Name":"5d9f230bcfbae514bb6c2215694c2ce7273fc604","Short":"5d9f230bcfba","Time":"2018-07-10T14:47:37Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module rsc.io/quote
+
+require (
+	rsc.io/quote/v3 v3.0.0
+	rsc.io/sampler v1.3.0
+)
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/quote/v3"
+
+// Hello returns a greeting.
+func Hello() string {
+	return quote.HelloV3()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return quote.GlassV3()
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return quote.GoV3()
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return quote.OptV3()
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.0.0.txt
new file mode 100644
index 0000000..9a07937
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.0.0.txt
@@ -0,0 +1,35 @@
+rsc.io/quote@v1.0.0
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v1.0.0","Name":"f488df80bcdbd3e5bafdc24ad7d1e79e83edd7e6","Short":"f488df80bcdb","Time":"2018-02-14T00:45:20Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.1.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.1.0.txt
new file mode 100644
index 0000000..0c41605
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.1.0.txt
@@ -0,0 +1,48 @@
+rsc.io/quote@v1.1.0
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v1.1.0","Name":"cfd7145f43f92a8d56b4a3dd603795a3291381a9","Short":"cfd7145f43f9","Time":"2018-02-14T00:46:44Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.0.txt
new file mode 100644
index 0000000..e714f0b
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.0.txt
@@ -0,0 +1,61 @@
+rsc.io/quote@v1.2.0
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v1.2.0","Name":"d8a3de91045c932a1c71e545308fe97571d6d65c","Short":"d8a3de91045c","Time":"2018-02-14T00:47:51Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+// Go returns a Go proverb.
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory. Share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.1.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.1.txt
new file mode 100644
index 0000000..89d5191
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.2.1.txt
@@ -0,0 +1,60 @@
+rsc.io/quote@v1.2.1
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v1.2.1","Name":"5c1f03b64ab7aa958798a569a31924655dc41e76","Short":"5c1f03b64ab7","Time":"2018-02-14T00:54:20Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.3.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.3.0.txt
new file mode 100644
index 0000000..d62766c
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.3.0.txt
@@ -0,0 +1,73 @@
+rsc.io/quote@v1.3.0
+
+-- .mod --
+module "rsc.io/quote"
+-- .info --
+{"Version":"v1.3.0","Name":"84de74b35823c1e49634f2262f1a58cfc951ebae","Short":"84de74b35823","Time":"2018-02-14T00:54:53Z"}
+-- go.mod --
+module "rsc.io/quote"
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.4.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.4.0.txt
new file mode 100644
index 0000000..698ff8d
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.4.0.txt
@@ -0,0 +1,79 @@
+rsc.io/quote@v1.4.0
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.0.0
+-- .info --
+{"Version":"v1.4.0","Name":"19e8b977bd2f437798c2cc2dcfe8a1c0f169481b","Short":"19e8b977bd2f","Time":"2018-02-14T00:56:05Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.0.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.0.txt
new file mode 100644
index 0000000..e7fcdbc
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.0.txt
@@ -0,0 +1,79 @@
+rsc.io/quote@v1.5.0
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v1.5.0","Name":"3ba1e30dc83bd52c990132b9dfb1688a9d22de13","Short":"3ba1e30dc83b","Time":"2018-02-14T00:58:15Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import "testing"
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.1.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.1.txt
new file mode 100644
index 0000000..eed051b
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.1.txt
@@ -0,0 +1,86 @@
+rsc.io/quote@23179ee8a569
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v1.5.1","Name":"23179ee8a569bb05d896ae05c6503ec69a19f99f","Short":"23179ee8a569","Time":"2018-02-14T00:58:40Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.2.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.2.txt
new file mode 100644
index 0000000..8671f6f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.2.txt
@@ -0,0 +1,98 @@
+rsc.io/quote@v1.5.2
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v1.5.2","Name":"c4d4236f92427c64bfbcf1cc3f8142ab18f30b22","Short":"c4d4236f9242","Time":"2018-02-14T15:44:20Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.3-pre1.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.3-pre1.txt
new file mode 100644
index 0000000..212ef13
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v1.5.3-pre1.txt
@@ -0,0 +1,100 @@
+rsc.io/quote@v1.5.3-pre1
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v1.5.3-pre1","Name":"2473dfd877c95382420e47686aa9076bf58c79e0","Short":"2473dfd877c9","Time":"2018-06-28T00:32:53Z"}
+-- buggy/buggy_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package buggy
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Fatal("buggy!")
+}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// A CHANGE!
+
+// Hello returns a greeting.
+func Hello() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func Glass() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func Go() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func Opt() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v2.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v2.0.0.txt
new file mode 100644
index 0000000..e461ed4
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v2.0.0.txt
@@ -0,0 +1,86 @@
+rsc.io/quote@v2.0.0
+
+-- .mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- .info --
+{"Version":"v0.0.0-20180709153244-fd906ed3b100","Name":"fd906ed3b100e47181ffa9ec36d82294525c9109","Short":"fd906ed3b100","Time":"2018-07-09T15:32:44Z"}
+-- go.mod --
+module "rsc.io/quote"
+
+require "rsc.io/sampler" v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func HelloV2() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func GlassV2() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func GoV2() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func OptV2() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v2_v2.0.1.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v2_v2.0.1.txt
new file mode 100644
index 0000000..d51128c
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v2_v2.0.1.txt
@@ -0,0 +1,86 @@
+rsc.io/quote/v2@v2.0.1
+
+-- .mod --
+module rsc.io/quote/v2
+
+require rsc.io/sampler v1.3.0
+-- .info --
+{"Version":"v2.0.1","Name":"754f68430672776c84704e2d10209a6ec700cd64","Short":"754f68430672","Time":"2018-07-09T16:25:34Z"}
+-- go.mod --
+module rsc.io/quote/v2
+
+require rsc.io/sampler v1.3.0
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func HelloV2() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func GlassV2() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func GoV2() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func OptV2() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+-- quote_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package quote
+
+import (
+	"os"
+	"testing"
+)
+
+func init() {
+	os.Setenv("LC_ALL", "en")
+}
+
+func TestHello(t *testing.T) {
+	hello := "Hello, world."
+	if out := Hello(); out != hello {
+		t.Errorf("Hello() = %q, want %q", out, hello)
+	}
+}
+
+func TestGlass(t *testing.T) {
+	glass := "I can eat glass and it doesn't hurt me."
+	if out := Glass(); out != glass {
+		t.Errorf("Glass() = %q, want %q", out, glass)
+	}
+}
+
+func TestGo(t *testing.T) {
+	go1 := "Don't communicate by sharing memory, share memory by communicating."
+	if out := Go(); out != go1 {
+		t.Errorf("Go() = %q, want %q", out, go1)
+	}
+}
+
+func TestOpt(t *testing.T) {
+	opt := "If a program is too slow, it must have a loop."
+	if out := Opt(); out != opt {
+		t.Errorf("Opt() = %q, want %q", out, opt)
+	}
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_quote_v3_v3.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_quote_v3_v3.0.0.txt
new file mode 100644
index 0000000..0afe1f0
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_quote_v3_v3.0.0.txt
@@ -0,0 +1,45 @@
+rsc.io/quote/v3@v3.0.0
+
+-- .mod --
+module rsc.io/quote/v3
+
+require rsc.io/sampler v1.3.0
+
+-- .info --
+{"Version":"v3.0.0","Name":"d88915d7e77ed0fd35d0a022a2f244e2202fd8c8","Short":"d88915d7e77e","Time":"2018-07-09T15:34:46Z"}
+-- go.mod --
+module rsc.io/quote/v3
+
+require rsc.io/sampler v1.3.0
+
+-- quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote // import "rsc.io/quote"
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func HelloV3() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func GlassV3() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a Go proverb.
+func GoV3() string {
+	return "Don't communicate by sharing memory, share memory by communicating."
+}
+
+// Opt returns an optimization truth.
+func OptV3() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.0.0.txt
new file mode 100644
index 0000000..c4b6a71
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.0.0.txt
@@ -0,0 +1,20 @@
+rsc.io/sampler@v1.0.0
+
+-- .mod --
+module "rsc.io/sampler"
+-- .info --
+{"Version":"v1.0.0","Name":"60bef405c52117ad21d2adb10872b95cf17f8fca","Short":"60bef405c521","Time":"2018-02-13T18:05:54Z"}
+-- go.mod --
+module "rsc.io/sampler"
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts.
+package sampler // import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func Hello() string {
+	return "Hello, world."
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.0.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.0.txt
new file mode 100644
index 0000000..98c35fa
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.0.txt
@@ -0,0 +1,138 @@
+rsc.io/sampler@v1.2.0
+
+-- .mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- .info --
+{"Version":"v1.2.0","Name":"25f24110b153246056eccc14a3a4cd81afaff586","Short":"25f24110b153","Time":"2018-02-13T18:13:45Z"}
+-- go.mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- hello.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations by Google Translate.
+
+package sampler
+
+var hello = newText(`
+
+English: en: Hello, world.
+French: fr: Bonjour le monde.
+Spanish: es: Hola Mundo.
+
+`)
+-- hello_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var helloTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"Hello, world.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Bonjour la monde.",
+	},
+}
+
+func TestHello(t *testing.T) {
+	for _, tt := range helloTests {
+		text := Hello(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Hello(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts.
+package sampler // import "rsc.io/sampler"
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// DefaultUserPrefs returns the default user language preferences.
+// It consults the $LC_ALL, $LC_MESSAGES, and $LANG environment
+// variables, in that order.
+func DefaultUserPrefs() []language.Tag {
+	var prefs []language.Tag
+	for _, k := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if env := os.Getenv(k); env != "" {
+			prefs = append(prefs, language.Make(env))
+		}
+	}
+	return prefs
+}
+
+// Hello returns a localized greeting.
+// If no prefs are given, Hello uses DefaultUserPrefs.
+func Hello(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return hello.find(prefs)
+}
+
+// A text is a localized text.
+type text struct {
+	byTag   map[string]string
+	matcher language.Matcher
+}
+
+// newText creates a new localized text, given a list of translations.
+func newText(s string) *text {
+	t := &text{
+		byTag: make(map[string]string),
+	}
+	var tags []language.Tag
+	for _, line := range strings.Split(s, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		f := strings.Split(line, ": ")
+		if len(f) != 3 {
+			continue
+		}
+		tag := language.Make(f[1])
+		tags = append(tags, tag)
+		t.byTag[tag.String()] = f[2]
+	}
+	t.matcher = language.NewMatcher(tags)
+	return t
+}
+
+// find finds the text to use for the given language tag preferences.
+func (t *text) find(prefs []language.Tag) string {
+	tag, _, _ := t.matcher.Match(prefs...)
+	s := t.byTag[tag.String()]
+	if strings.HasPrefix(s, "RTL ") {
+		s = "\u200F" + strings.TrimPrefix(s, "RTL ") + "\u200E"
+	}
+	return s
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.1.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.1.txt
new file mode 100644
index 0000000..7982ccc
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.2.1.txt
@@ -0,0 +1,134 @@
+generated by ./addmod.bash rsc.io/sampler@v1.2.1
+
+-- .mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- .info --
+{"Version":"v1.2.1","Name":"cac3af4f8a0ab40054fa6f8d423108a63a1255bb","Short":"cac3af4f8a0a","Time":"2018-02-13T18:16:22Z"}
+-- hello.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations by Google Translate.
+
+package sampler
+
+var hello = newText(`
+
+English: en: Hello, world.
+French: fr: Bonjour le monde.
+Spanish: es: Hola Mundo.
+
+`)
+-- hello_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var helloTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"Hello, world.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Bonjour le monde.",
+	},
+}
+
+func TestHello(t *testing.T) {
+	for _, tt := range helloTests {
+		text := Hello(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Hello(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts.
+package sampler // import "rsc.io/sampler"
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// DefaultUserPrefs returns the default user language preferences.
+// It consults the $LC_ALL, $LC_MESSAGES, and $LANG environment
+// variables, in that order.
+func DefaultUserPrefs() []language.Tag {
+	var prefs []language.Tag
+	for _, k := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if env := os.Getenv(k); env != "" {
+			prefs = append(prefs, language.Make(env))
+		}
+	}
+	return prefs
+}
+
+// Hello returns a localized greeting.
+// If no prefs are given, Hello uses DefaultUserPrefs.
+func Hello(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return hello.find(prefs)
+}
+
+// A text is a localized text.
+type text struct {
+	byTag   map[string]string
+	matcher language.Matcher
+}
+
+// newText creates a new localized text, given a list of translations.
+func newText(s string) *text {
+	t := &text{
+		byTag: make(map[string]string),
+	}
+	var tags []language.Tag
+	for _, line := range strings.Split(s, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		f := strings.Split(line, ": ")
+		if len(f) != 3 {
+			continue
+		}
+		tag := language.Make(f[1])
+		tags = append(tags, tag)
+		t.byTag[tag.String()] = f[2]
+	}
+	t.matcher = language.NewMatcher(tags)
+	return t
+}
+
+// find finds the text to use for the given language tag preferences.
+func (t *text) find(prefs []language.Tag) string {
+	tag, _, _ := t.matcher.Match(prefs...)
+	s := t.byTag[tag.String()]
+	if strings.HasPrefix(s, "RTL ") {
+		s = "\u200F" + strings.TrimPrefix(s, "RTL ") + "\u200E"
+	}
+	return s
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.0.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.0.txt
new file mode 100644
index 0000000..febe51f
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.0.txt
@@ -0,0 +1,202 @@
+rsc.io/sampler@v1.3.0
+
+-- .mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- .info --
+{"Version":"v1.3.0","Name":"0cc034b51e57ed7832d4c67d526f75a900996e5c","Short":"0cc034b51e57","Time":"2018-02-13T19:05:03Z"}
+-- glass.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations from Frank da Cruz, Ethan Mollick, and many others.
+// See http://kermitproject.org/utf8.html.
+// http://www.oocities.org/nodotus/hbglass.html
+// https://en.wikipedia.org/wiki/I_Can_Eat_Glass
+
+package sampler
+
+var glass = newText(`
+
+English: en: I can eat glass and it doesn't hurt me.
+French: fr: Je peux manger du verre, ça ne me fait pas mal.
+Spanish: es: Puedo comer vidrio, no me hace daño.
+
+`)
+-- glass_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+	_ "rsc.io/testonly"
+)
+
+var glassTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"I can eat glass and it doesn't hurt me.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Je peux manger du verre, ça ne me fait pas mal.",
+	},
+}
+
+func TestGlass(t *testing.T) {
+	for _, tt := range glassTests {
+		text := Glass(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Glass(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- go.mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- hello.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations by Google Translate.
+
+package sampler
+
+var hello = newText(`
+
+English: en: Hello, world.
+French: fr: Bonjour le monde.
+Spanish: es: Hola Mundo.
+
+`)
+-- hello_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var helloTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"Hello, world.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Bonjour le monde.",
+	},
+}
+
+func TestHello(t *testing.T) {
+	for _, tt := range helloTests {
+		text := Hello(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Hello(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts.
+package sampler // import "rsc.io/sampler"
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// DefaultUserPrefs returns the default user language preferences.
+// It consults the $LC_ALL, $LC_MESSAGES, and $LANG environment
+// variables, in that order.
+func DefaultUserPrefs() []language.Tag {
+	var prefs []language.Tag
+	for _, k := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if env := os.Getenv(k); env != "" {
+			prefs = append(prefs, language.Make(env))
+		}
+	}
+	return prefs
+}
+
+// Hello returns a localized greeting.
+// If no prefs are given, Hello uses DefaultUserPrefs.
+func Hello(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return hello.find(prefs)
+}
+
+// Glass returns a localized silly phrase.
+// If no prefs are given, Glass uses DefaultUserPrefs.
+func Glass(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return glass.find(prefs)
+}
+
+// A text is a localized text.
+type text struct {
+	byTag   map[string]string
+	matcher language.Matcher
+}
+
+// newText creates a new localized text, given a list of translations.
+func newText(s string) *text {
+	t := &text{
+		byTag: make(map[string]string),
+	}
+	var tags []language.Tag
+	for _, line := range strings.Split(s, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		f := strings.Split(line, ": ")
+		if len(f) != 3 {
+			continue
+		}
+		tag := language.Make(f[1])
+		tags = append(tags, tag)
+		t.byTag[tag.String()] = f[2]
+	}
+	t.matcher = language.NewMatcher(tags)
+	return t
+}
+
+// find finds the text to use for the given language tag preferences.
+func (t *text) find(prefs []language.Tag) string {
+	tag, _, _ := t.matcher.Match(prefs...)
+	s := t.byTag[tag.String()]
+	if strings.HasPrefix(s, "RTL ") {
+		s = "\u200F" + strings.TrimPrefix(s, "RTL ") + "\u200E"
+	}
+	return s
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.1.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.1.txt
new file mode 100644
index 0000000..a293f10
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.3.1.txt
@@ -0,0 +1,201 @@
+rsc.io/sampler@v1.3.1
+
+-- .mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- .info --
+{"Version":"v1.3.1","Name":"f545d0289d06e2add4556ea6a15fc4938014bf87","Short":"f545d0289d06","Time":"2018-02-14T16:34:12Z"}
+-- glass.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations from Frank da Cruz, Ethan Mollick, and many others.
+// See http://kermitproject.org/utf8.html.
+// http://www.oocities.org/nodotus/hbglass.html
+// https://en.wikipedia.org/wiki/I_Can_Eat_Glass
+
+package sampler
+
+var glass = newText(`
+
+English: en: I can eat glass and it doesn't hurt me.
+French: fr: Je peux manger du verre, ça ne me fait pas mal.
+Spanish: es: Puedo comer vidrio, no me hace daño.
+
+`)
+-- glass_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var glassTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"I can eat glass and it doesn't hurt me.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Je peux manger du verre, ça ne me fait pas mal.",
+	},
+}
+
+func TestGlass(t *testing.T) {
+	for _, tt := range glassTests {
+		text := Glass(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Glass(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- go.mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- hello.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations by Google Translate.
+
+package sampler
+
+var hello = newText(`
+
+English: en: Hello, world.
+French: fr: Bonjour le monde.
+Spanish: es: Hola Mundo.
+
+`)
+-- hello_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var helloTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"Hello, world.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Bonjour le monde.",
+	},
+}
+
+func TestHello(t *testing.T) {
+	for _, tt := range helloTests {
+		text := Hello(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Hello(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts in a variety of languages.
+package sampler // import "rsc.io/sampler"
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// DefaultUserPrefs returns the default user language preferences.
+// It consults the $LC_ALL, $LC_MESSAGES, and $LANG environment
+// variables, in that order.
+func DefaultUserPrefs() []language.Tag {
+	var prefs []language.Tag
+	for _, k := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if env := os.Getenv(k); env != "" {
+			prefs = append(prefs, language.Make(env))
+		}
+	}
+	return prefs
+}
+
+// Hello returns a localized greeting.
+// If no prefs are given, Hello uses DefaultUserPrefs.
+func Hello(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return hello.find(prefs)
+}
+
+// Glass returns a localized silly phrase.
+// If no prefs are given, Glass uses DefaultUserPrefs.
+func Glass(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return glass.find(prefs)
+}
+
+// A text is a localized text.
+type text struct {
+	byTag   map[string]string
+	matcher language.Matcher
+}
+
+// newText creates a new localized text, given a list of translations.
+func newText(s string) *text {
+	t := &text{
+		byTag: make(map[string]string),
+	}
+	var tags []language.Tag
+	for _, line := range strings.Split(s, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		f := strings.Split(line, ": ")
+		if len(f) != 3 {
+			continue
+		}
+		tag := language.Make(f[1])
+		tags = append(tags, tag)
+		t.byTag[tag.String()] = f[2]
+	}
+	t.matcher = language.NewMatcher(tags)
+	return t
+}
+
+// find finds the text to use for the given language tag preferences.
+func (t *text) find(prefs []language.Tag) string {
+	tag, _, _ := t.matcher.Match(prefs...)
+	s := t.byTag[tag.String()]
+	if strings.HasPrefix(s, "RTL ") {
+		s = "\u200F" + strings.TrimPrefix(s, "RTL ") + "\u200E"
+	}
+	return s
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_sampler_v1.99.99.txt b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.99.99.txt
new file mode 100644
index 0000000..5036d20
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_sampler_v1.99.99.txt
@@ -0,0 +1,140 @@
+rsc.io/sampler@v1.99.99
+
+-- .mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- .info --
+{"Version":"v1.99.99","Name":"732a3c400797d8835f2af34a9561f155bef85435","Short":"732a3c400797","Time":"2018-02-13T22:20:19Z"}
+-- go.mod --
+module "rsc.io/sampler"
+
+require "golang.org/x/text" v0.0.0-20170915032832-14c0d48ead0c
+-- hello.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Translations by Google Translate.
+
+package sampler
+
+var hello = newText(`
+
+English: en: 99 bottles of beer on the wall, 99 bottles of beer, ...
+
+`)
+-- hello_test.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package sampler
+
+import (
+	"testing"
+
+	"golang.org/x/text/language"
+)
+
+var helloTests = []struct {
+	prefs []language.Tag
+	text  string
+}{
+	{
+		[]language.Tag{language.Make("en-US"), language.Make("fr")},
+		"Hello, world.",
+	},
+	{
+		[]language.Tag{language.Make("fr"), language.Make("en-US")},
+		"Bonjour le monde.",
+	},
+}
+
+func TestHello(t *testing.T) {
+	for _, tt := range helloTests {
+		text := Hello(tt.prefs...)
+		if text != tt.text {
+			t.Errorf("Hello(%v) = %q, want %q", tt.prefs, text, tt.text)
+		}
+	}
+}
+-- sampler.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package sampler shows simple texts.
+package sampler // import "rsc.io/sampler"
+
+import (
+	"os"
+	"strings"
+
+	"golang.org/x/text/language"
+)
+
+// DefaultUserPrefs returns the default user language preferences.
+// It consults the $LC_ALL, $LC_MESSAGES, and $LANG environment
+// variables, in that order.
+func DefaultUserPrefs() []language.Tag {
+	var prefs []language.Tag
+	for _, k := range []string{"LC_ALL", "LC_MESSAGES", "LANG"} {
+		if env := os.Getenv(k); env != "" {
+			prefs = append(prefs, language.Make(env))
+		}
+	}
+	return prefs
+}
+
+// Hello returns a localized greeting.
+// If no prefs are given, Hello uses DefaultUserPrefs.
+func Hello(prefs ...language.Tag) string {
+	if len(prefs) == 0 {
+		prefs = DefaultUserPrefs()
+	}
+	return hello.find(prefs)
+}
+
+func Glass() string {
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// A text is a localized text.
+type text struct {
+	byTag   map[string]string
+	matcher language.Matcher
+}
+
+// newText creates a new localized text, given a list of translations.
+func newText(s string) *text {
+	t := &text{
+		byTag: make(map[string]string),
+	}
+	var tags []language.Tag
+	for _, line := range strings.Split(s, "\n") {
+		line = strings.TrimSpace(line)
+		if line == "" {
+			continue
+		}
+		f := strings.Split(line, ": ")
+		if len(f) != 3 {
+			continue
+		}
+		tag := language.Make(f[1])
+		tags = append(tags, tag)
+		t.byTag[tag.String()] = f[2]
+	}
+	t.matcher = language.NewMatcher(tags)
+	return t
+}
+
+// find finds the text to use for the given language tag preferences.
+func (t *text) find(prefs []language.Tag) string {
+	tag, _, _ := t.matcher.Match(prefs...)
+	s := t.byTag[tag.String()]
+	if strings.HasPrefix(s, "RTL ") {
+		s = "\u200F" + strings.TrimPrefix(s, "RTL ") + "\u200E"
+	}
+	return s
+}
diff --git a/src/cmd/go/testdata/mod/rsc.io_testonly_v1.0.0.txt b/src/cmd/go/testdata/mod/rsc.io_testonly_v1.0.0.txt
new file mode 100644
index 0000000..dfb8ca2
--- /dev/null
+++ b/src/cmd/go/testdata/mod/rsc.io_testonly_v1.0.0.txt
@@ -0,0 +1,9 @@
+rsc.io/testonly v1.0.0
+written by hand
+
+-- .mod --
+module rsc.io/testonly
+-- .info --
+{"Version":"v1.0.0"}
+-- testonly.go --
+package testonly
diff --git a/src/cmd/go/testdata/modlegacy/src/new/go.mod b/src/cmd/go/testdata/modlegacy/src/new/go.mod
new file mode 100644
index 0000000..d0dd46d
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/go.mod
@@ -0,0 +1 @@
+module "new/v2"
diff --git a/src/cmd/go/testdata/modlegacy/src/new/new.go b/src/cmd/go/testdata/modlegacy/src/new/new.go
new file mode 100644
index 0000000..e99c47a
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/new.go
@@ -0,0 +1,3 @@
+package new
+
+import _ "new/v2/p2"
diff --git a/src/cmd/go/testdata/modlegacy/src/new/p1/p1.go b/src/cmd/go/testdata/modlegacy/src/new/p1/p1.go
new file mode 100644
index 0000000..4539f40
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/p1/p1.go
@@ -0,0 +1,7 @@
+package p1
+
+import _ "old/p2"
+import _ "new/v2"
+import _ "new/v2/p2"
+import _ "new/sub/v2/x/v1/y" // v2 is module, v1 is directory in module
+import _ "new/sub/inner/x"   // new/sub/inner/go.mod overrides new/sub/go.mod
diff --git a/src/cmd/go/testdata/modlegacy/src/new/p2/p2.go b/src/cmd/go/testdata/modlegacy/src/new/p2/p2.go
new file mode 100644
index 0000000..9b9052f
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/p2/p2.go
@@ -0,0 +1 @@
+package p2
diff --git a/src/cmd/go/testdata/modlegacy/src/new/sub/go.mod b/src/cmd/go/testdata/modlegacy/src/new/sub/go.mod
new file mode 100644
index 0000000..484d20c
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/sub/go.mod
@@ -0,0 +1 @@
+module new/sub/v2
diff --git a/src/cmd/go/testdata/modlegacy/src/new/sub/inner/go.mod b/src/cmd/go/testdata/modlegacy/src/new/sub/inner/go.mod
new file mode 100644
index 0000000..ba39345
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/sub/inner/go.mod
@@ -0,0 +1 @@
+module new/sub/inner
diff --git a/src/cmd/go/testdata/modlegacy/src/new/sub/inner/x/x.go b/src/cmd/go/testdata/modlegacy/src/new/sub/inner/x/x.go
new file mode 100644
index 0000000..823aafd
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/sub/inner/x/x.go
@@ -0,0 +1 @@
+package x
diff --git a/src/cmd/go/testdata/modlegacy/src/new/sub/x/v1/y/y.go b/src/cmd/go/testdata/modlegacy/src/new/sub/x/v1/y/y.go
new file mode 100644
index 0000000..789ca71
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/new/sub/x/v1/y/y.go
@@ -0,0 +1 @@
+package y
diff --git a/src/cmd/go/testdata/modlegacy/src/old/p1/p1.go b/src/cmd/go/testdata/modlegacy/src/old/p1/p1.go
new file mode 100644
index 0000000..9052748
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/old/p1/p1.go
@@ -0,0 +1,5 @@
+package p1
+
+import _ "old/p2"
+import _ "new/p1"
+import _ "new"
diff --git a/src/cmd/go/testdata/modlegacy/src/old/p2/p2.go b/src/cmd/go/testdata/modlegacy/src/old/p2/p2.go
new file mode 100644
index 0000000..9b9052f
--- /dev/null
+++ b/src/cmd/go/testdata/modlegacy/src/old/p2/p2.go
@@ -0,0 +1 @@
+package p2
diff --git a/src/cmd/go/testdata/savedir.go b/src/cmd/go/testdata/savedir.go
new file mode 100644
index 0000000..d469c31
--- /dev/null
+++ b/src/cmd/go/testdata/savedir.go
@@ -0,0 +1,79 @@
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build ignore
+
+// Savedir archives a directory tree as a txtar archive printed to standard output.
+//
+// Usage:
+//
+//	go run savedir.go /path/to/dir >saved.txt
+//
+// Typically the tree is later extracted during a test with tg.extract("testdata/saved.txt").
+//
+package main
+
+import (
+	"flag"
+	"fmt"
+	"io/fs"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+	"unicode/utf8"
+
+	"../internal/txtar"
+)
+
+func usage() {
+	fmt.Fprintf(os.Stderr, "usage: go run savedir.go dir >saved.txt\n")
+	os.Exit(2)
+}
+
+const goCmd = "vgo"
+
+func main() {
+	flag.Usage = usage
+	flag.Parse()
+	if flag.NArg() != 1 {
+		usage()
+	}
+
+	log.SetPrefix("savedir: ")
+	log.SetFlags(0)
+
+	dir := flag.Arg(0)
+
+	a := new(txtar.Archive)
+	dir = filepath.Clean(dir)
+	filepath.WalkDir(dir, func(path string, info fs.DirEntry, err error) error {
+		if path == dir {
+			return nil
+		}
+		name := info.Name()
+		if strings.HasPrefix(name, ".") {
+			if info.IsDir() {
+				return filepath.SkipDir
+			}
+			return nil
+		}
+		if !info.Type().IsRegular() {
+			return nil
+		}
+		data, err := os.ReadFile(path)
+		if err != nil {
+			log.Fatal(err)
+		}
+		if !utf8.Valid(data) {
+			log.Printf("%s: ignoring invalid UTF-8 data", path)
+			return nil
+		}
+		a.Files = append(a.Files, txtar.File{Name: strings.TrimPrefix(path, dir+string(filepath.Separator)), Data: data})
+		return nil
+	})
+
+	data := txtar.Format(a)
+	os.Stdout.Write(data)
+}
diff --git a/src/cmd/go/testdata/script/README b/src/cmd/go/testdata/script/README
new file mode 100644
index 0000000..d658ceb
--- /dev/null
+++ b/src/cmd/go/testdata/script/README
@@ -0,0 +1,310 @@
+This directory holds test scripts *.txt run during 'go test cmd/go'.
+To run a specific script foo.txt
+
+	go test cmd/go -run=Script/^foo$
+
+In general script files should have short names: a few words, not whole sentences.
+The first word should be the general category of behavior being tested,
+often the name of a go subcommand (list, build, test, ...) or concept (vendor, pattern).
+
+Each script is a text archive (go doc cmd/go/internal/txtar).
+The script begins with an actual command script to run
+followed by the content of zero or more supporting files to
+create in the script's temporary file system before it starts executing.
+
+As an example, run_hello.txt says:
+
+	# hello world
+	go run hello.go
+	stderr 'hello world'
+	! stdout .
+
+	-- hello.go --
+	package main
+	func main() { println("hello world") }
+
+Each script runs in a fresh temporary work directory tree, available to scripts as $WORK.
+Scripts also have access to these other environment variables:
+
+	GOARCH=<target GOARCH>
+	GOCACHE=<actual GOCACHE being used outside the test>
+	GOEXE=<executable file suffix: .exe on Windows, empty on other systems>
+	GOEXPSTRING=<value of objabi.Expstring(), from GOEXPERIMENT when toolchain built>
+	GOOS=<target GOOS>
+	GOPATH=$WORK/gopath
+	GOPROXY=<local module proxy serving from cmd/go/testdata/mod>
+	GOROOT=<actual GOROOT>
+	GOROOT_FINAL=<actual GOROOT_FINAL>
+	TESTGO_GOROOT=<GOROOT used to build cmd/go, for use in tests that may change GOROOT>
+	HOME=/no-home
+	PATH=<actual PATH>
+	TMPDIR=$WORK/tmp
+	GODEBUG=<actual GODEBUG>
+	devnull=<value of os.DevNull>
+	goversion=<current Go version; for example, 1.12>
+	:=<OS-specific path list separator>
+
+The scripts' supporting files are unpacked relative to $GOPATH/src (aka $WORK/gopath/src)
+and then the script begins execution in that directory as well. Thus the example above runs
+in $WORK/gopath/src with GOPATH=$WORK/gopath and $WORK/gopath/src/hello.go
+containing the listed contents.
+
+The lines at the top of the script are a sequence of commands to be executed
+by a tiny script engine in ../../script_test.go (not the system shell).
+The script stops and the overall test fails if any particular command fails.
+
+Each line is parsed into a sequence of space-separated command words,
+with environment variable expansion and # marking an end-of-line comment.
+Adding single quotes around text keeps spaces in that text from being treated
+as word separators and also disables environment variable expansion.
+Inside a single-quoted block of text, a repeated single quote indicates
+a literal single quote, as in:
+
+	'Don''t communicate by sharing memory.'
+
+A line beginning with # is a comment and conventionally explains what is
+being done or tested at the start of a new phase in the script.
+
+The command prefix ! indicates that the command on the rest of the line
+(typically go or a matching predicate) must fail, not succeed. Only certain
+commands support this prefix. They are indicated below by [!] in the synopsis.
+
+The command prefix ? indicates that the command on the rest of the line
+may or may not succeed, but the test should continue regardless.
+Commands that support this prefix are indicated by [?].
+
+The command prefix [cond] indicates that the command on the rest of the line
+should only run when the condition is satisfied. The available conditions are:
+
+ - GOOS and GOARCH values, like [386], [windows], and so on.
+ - Compiler names, like [gccgo], [gc].
+ - Test environment details:
+   - [short] for testing.Short()
+   - [cgo], [msan], [race] for whether cgo, msan, and the race detector can be used
+   - [net] for whether the external network can be used
+   - [link] for testenv.HasLink()
+   - [root] for os.Geteuid() == 0
+   - [symlink] for testenv.HasSymlink()
+   - [case-sensitive] for whether the file system is case-sensitive
+   - [exec:prog] for whether prog is available for execution (found by exec.LookPath)
+   - [GODEBUG:value] for whether value is one of the comma-separated entries in the GODEBUG variable
+   - [buildmode:value] for whether -buildmode=value is supported
+
+A condition can be negated: [!short] means to run the rest of the line
+when testing.Short() is false. Multiple conditions may be given for a single
+command, for example, '[linux] [amd64] skip'. The command will run if all conditions
+are satisfied.
+
+The commands are:
+
+- [! | ?] cc args... [&]
+  Run the C compiler, the platform specific flags (i.e. `go env GOGCCFLAGS`) will be
+  added automatically before args.
+
+- cd dir
+  Change to the given directory for future commands.
+
+- chmod perm path...
+  Change the permissions of the files or directories named by the path arguments
+  to be equal to perm. Only numerical permissions are supported.
+
+- cmp file1 file2
+  Check that the named files have the same content.
+  By convention, file1 is the actual data and file2 the expected data.
+  File1 can be "stdout" or "stderr" to use the standard output or standard error
+  from the most recent exec or go command.
+  (If the files have differing content, the failure prints a diff.)
+
+- cmpenv file1 file2
+  Like cmp, but environment variables are substituted in the file contents
+  before the comparison. For example, $GOOS is replaced by the target GOOS.
+
+- [! | ?] cp src... dst
+  Copy the listed files to the target file or existing directory.
+  src can include "stdout" or "stderr" to use the standard output or standard error
+  from the most recent exec or go command.
+
+- env [-r] [key=value...]
+  With no arguments, print the environment to stdout
+  (useful for debugging and for verifying initial state).
+  Otherwise add the listed key=value pairs to the environment.
+  The -r flag causes the values to be escaped using regexp.QuoteMeta
+  before being recorded.
+
+- [! | ?] exec program [args...] [&]
+  Run the given executable program with the arguments.
+  It must (or must not) succeed.
+  Note that 'exec' does not terminate the script (unlike in Unix shells).
+
+  If the last token is '&', the program executes in the background. The standard
+  output and standard error of the previous command is cleared, but the output
+  of the background process is buffered — and checking of its exit status is
+  delayed — until the next call to 'wait', 'skip', or 'stop' or the end of the
+  test. If any background processes remain at the end of the test, they
+  are terminated using os.Interrupt (if supported) or os.Kill and the test
+  must not depend upon their exit status.
+
+- [!] exists [-readonly] [-exec] file...
+  Each of the listed files or directories must (or must not) exist.
+  If -readonly is given, the files or directories must be unwritable.
+  If -exec is given, the files or directories must be executable.
+
+- [! | ?] go args... [&]
+  Run the (test copy of the) go command with the given arguments.
+  It must (or must not) succeed.
+
+- [!] grep [-count=N] [-q] pattern file
+  The file's content must (or must not) match the regular expression pattern.
+  For positive matches, -count=N specifies an exact number of matches to require.
+  The -q flag disables printing the file content on a mismatch.
+
+- mkdir path...
+  Create the listed directories, if they do not already exists.
+
+- rm file...
+  Remove the listed files or directories.
+
+- skip [message]
+  Mark the test skipped, including the message if given.
+
+- [!] stale path...
+  The packages named by the path arguments must (or must not)
+  be reported as "stale" by the go command.
+
+- [!] stderr [-count=N] pattern
+  Apply the grep command (see above) to the standard error
+  from the most recent exec, go, or wait command.
+
+- [!] stdout [-count=N] pattern
+  Apply the grep command (see above) to the standard output
+  from the most recent exec, go, wait, or env command.
+
+- stop [message]
+  Stop the test early (marking it as passing), including the message if given.
+
+- symlink file -> target
+  Create file as a symlink to target. The -> (like in ls -l output) is required.
+
+- wait
+  Wait for all 'exec' and 'go' commands started in the background (with the '&'
+  token) to exit, and display success or failure status for them.
+  After a call to wait, the 'stderr' and 'stdout' commands will apply to the
+  concatenation of the corresponding streams of the background commands,
+  in the order in which those commands were started.
+
+When TestScript runs a script and the script fails, by default TestScript shows
+the execution of the most recent phase of the script (since the last # comment)
+and only shows the # comments for earlier phases. For example, here is a
+multi-phase script with a bug in it:
+
+	# GOPATH with p1 in d2, p2 in d2
+	env GOPATH=$WORK/d1${:}$WORK/d2
+
+	# build & install p1
+	env
+	go install -i p1
+	! stale p1
+	! stale p2
+
+	# modify p2 - p1 should appear stale
+	cp $WORK/p2x.go $WORK/d2/src/p2/p2.go
+	stale p1 p2
+
+	# build & install p1 again
+	go install -i p11
+	! stale p1
+	! stale p2
+
+	-- $WORK/d1/src/p1/p1.go --
+	package p1
+	import "p2"
+	func F() { p2.F() }
+	-- $WORK/d2/src/p2/p2.go --
+	package p2
+	func F() {}
+	-- $WORK/p2x.go --
+	package p2
+	func F() {}
+	func G() {}
+
+The bug is that the final phase installs p11 instead of p1. The test failure looks like:
+
+	$ go test -run=Script
+	--- FAIL: TestScript (3.75s)
+	    --- FAIL: TestScript/install_rebuild_gopath (0.16s)
+	        script_test.go:223:
+	            # GOPATH with p1 in d2, p2 in d2 (0.000s)
+	            # build & install p1 (0.087s)
+	            # modify p2 - p1 should appear stale (0.029s)
+	            # build & install p1 again (0.022s)
+	            > go install -i p11
+	            [stderr]
+	            can't load package: package p11: cannot find package "p11" in any of:
+	            	/Users/rsc/go/src/p11 (from $GOROOT)
+	            	$WORK/d1/src/p11 (from $GOPATH)
+	            	$WORK/d2/src/p11
+	            [exit status 1]
+	            FAIL: unexpected go command failure
+
+	        script_test.go:73: failed at testdata/script/install_rebuild_gopath.txt:15 in $WORK/gopath/src
+
+	FAIL
+	exit status 1
+	FAIL	cmd/go	4.875s
+	$
+
+Note that the commands in earlier phases have been hidden, so that the relevant
+commands are more easily found, and the elapsed time for a completed phase
+is shown next to the phase heading. To see the entire execution, use "go test -v",
+which also adds an initial environment dump to the beginning of the log.
+
+Note also that in reported output, the actual name of the per-script temporary directory
+has been consistently replaced with the literal string $WORK.
+
+The cmd/go test flag -testwork (which must appear on the "go test" command line after
+standard test flags) causes each test to log the name of its $WORK directory and other
+environment variable settings and also to leave that directory behind when it exits,
+for manual debugging of failing tests:
+
+	$ go test -run=Script -work
+	--- FAIL: TestScript (3.75s)
+	    --- FAIL: TestScript/install_rebuild_gopath (0.16s)
+	        script_test.go:223:
+	            WORK=/tmp/cmd-go-test-745953508/script-install_rebuild_gopath
+	            GOARCH=
+	            GOCACHE=/Users/rsc/Library/Caches/go-build
+	            GOOS=
+	            GOPATH=$WORK/gopath
+	            GOROOT=/Users/rsc/go
+	            HOME=/no-home
+	            TMPDIR=$WORK/tmp
+	            exe=
+
+	            # GOPATH with p1 in d2, p2 in d2 (0.000s)
+	            # build & install p1 (0.085s)
+	            # modify p2 - p1 should appear stale (0.030s)
+	            # build & install p1 again (0.019s)
+	            > go install -i p11
+	            [stderr]
+	            can't load package: package p11: cannot find package "p11" in any of:
+	            	/Users/rsc/go/src/p11 (from $GOROOT)
+	            	$WORK/d1/src/p11 (from $GOPATH)
+	            	$WORK/d2/src/p11
+	            [exit status 1]
+	            FAIL: unexpected go command failure
+
+	        script_test.go:73: failed at testdata/script/install_rebuild_gopath.txt:15 in $WORK/gopath/src
+
+	FAIL
+	exit status 1
+	FAIL	cmd/go	4.875s
+	$
+
+	$ WORK=/tmp/cmd-go-test-745953508/script-install_rebuild_gopath
+	$ cd $WORK/d1/src/p1
+	$ cat p1.go
+	package p1
+	import "p2"
+	func F() { p2.F() }
+	$
+
diff --git a/src/cmd/go/testdata/script/bug.txt b/src/cmd/go/testdata/script/bug.txt
new file mode 100644
index 0000000..b9bbaaa
--- /dev/null
+++ b/src/cmd/go/testdata/script/bug.txt
@@ -0,0 +1,46 @@
+# Verify that go bug creates the appropriate URL issue body
+
+[!linux] skip
+
+go install
+env BROWSER=$GOPATH/bin/browser
+go bug
+exists $TMPDIR/browser
+grep '^go version' $TMPDIR/browser
+grep '^GOROOT/bin/go version: go version' $TMPDIR/browser
+grep '^GOROOT/bin/go tool compile -V: compile version' $TMPDIR/browser
+grep '^uname -sr: Linux' $TMPDIR/browser
+
+-- go.mod --
+module browser
+
+-- main.go --
+package main
+
+import (
+	"fmt"
+	"net/url"
+	"os"
+	"path/filepath"
+)
+
+func main() {
+	u, err := url.Parse(os.Args[1])
+	if err != nil {
+		panic(err)
+	}
+	body, err := url.PathUnescape(u.Query().Get("body"))
+	if err != nil {
+		panic(err)
+	}
+	out := filepath.Join(os.TempDir(), "browser")
+	f, err := os.Create(out)
+	if err != nil {
+		panic(err)
+	}
+	fmt.Fprintln(f, body)
+	if err := f.Close(); err != nil {
+		panic(err)
+	}
+}
+
diff --git a/src/cmd/go/testdata/script/build_GOTMPDIR.txt b/src/cmd/go/testdata/script/build_GOTMPDIR.txt
new file mode 100644
index 0000000..1073517
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_GOTMPDIR.txt
@@ -0,0 +1,50 @@
+# Set GOCACHE to a clean directory to ensure that 'go build' has work to report.
+[!windows] env GOCACHE=$WORK/gocache
+[windows] env GOCACHE=$WORK\gocache
+
+# 'go build' should use GOTMPDIR if set.
+[!windows] env GOTMPDIR=$WORK/my-favorite-tmpdir
+[windows] env GOTMPDIR=$WORK\my-favorite-tmpdir
+mkdir $GOTMPDIR
+go build -x hello.go
+stderr ^WORK=.*my-favorite-tmpdir
+
+# Make GOTMPDIR a regular file. This prevents the creation of work directories,
+# so we can check that certain commands don't create them.
+# This simulates running on a full disk or a read-only volume.
+rm $GOTMPDIR
+cp hello.go $GOTMPDIR # any file will do
+
+# 'go build' should fail if GOTMPDIR is read-only.
+! go build -x .
+stderr '^go: creating work dir: \w+ '$GOTMPDIR
+
+# 'go list' should only fail if it needs to build something.
+go list -x .
+! stderr 'creating work dir'
+stdout m
+go list -m all
+stdout m
+! go list -x -export .
+stderr '^go: creating work dir: \w+ '$GOTMPDIR
+
+# 'go clean -cache' and 'go clean -modcache' should not fail.
+go clean -x -cache
+! stderr 'creating work dir'
+go clean -x -modcache
+! stderr 'creating work dir'
+
+# 'go env' should not fail for specific variables.
+# Without arguments, it needs to initialize a builder to load cgo flags, and
+# that uses a temporary directory.
+! go env
+stderr '^go: creating work dir: \w+ '$GOTMPDIR
+go env GOROOT
+
+-- go.mod --
+module m
+
+go 1.15
+-- hello.go --
+package main
+func main() { println("hello") }
diff --git a/src/cmd/go/testdata/script/build_acl_windows.txt b/src/cmd/go/testdata/script/build_acl_windows.txt
new file mode 100644
index 0000000..13a3ba2
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_acl_windows.txt
@@ -0,0 +1,44 @@
+[!windows] stop
+[!exec:icacls] skip
+[!exec:powershell] skip
+
+# Create $WORK\guest and give the Guests group full access.
+# Files created within that directory will have different security attributes by default.
+mkdir $WORK\guest
+exec icacls $WORK\guest /grant '*S-1-5-32-546:(oi)(ci)f'
+
+env TMP=$WORK\guest
+env TEMP=$WORK\guest
+
+# Build a binary using the guest directory as an intermediate
+cd TestACL
+go build -o main.exe main.go
+# Build the same binary, but write it to the guest directory.
+go build -o $TMP\main.exe main.go
+
+# Read ACLs for the files.
+exec powershell -Command 'Get-Acl main.exe | Select -expand AccessToString'
+cp stdout $WORK\exe-acl.txt
+exec powershell -Command 'Get-Acl main.go | Select -expand AccessToString'
+cp stdout $WORK\src-acl.txt
+cd $TMP
+exec powershell -Command 'Get-Acl main.exe | Select -expand AccessToString'
+cp stdout $WORK\guest-acl.txt
+
+cd $WORK
+
+# The executable written to the source directory should have the same ACL as the source file.
+cmp $WORK\exe-acl.txt $WORK\src-acl.txt
+
+# The file written to the guest-allowed directory should give Guests control.
+grep 'BUILTIN\\Guests\s+Allow' $WORK\guest-acl.txt
+
+# The file written to the ordinary directory should not.
+! grep 'BUILTIN\\Guests\s+Allow' $WORK\exe-acl.txt
+
+
+-- TestACL/go.mod --
+module TestACL
+-- TestACL/main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_arm.txt b/src/cmd/go/testdata/script/build_arm.txt
new file mode 100644
index 0000000..ff2a364
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_arm.txt
@@ -0,0 +1,13 @@
+[short] skip 'skipping cross-compile in short mode'
+
+env GOARCH=arm
+env GOOS=linux
+env GOARM=5
+
+go build hello.go
+! stderr 'unable to find math.a'
+
+-- hello.go --
+package main
+
+func main() {}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/build_cache_arch_mode.txt b/src/cmd/go/testdata/script/build_cache_arch_mode.txt
new file mode 100644
index 0000000..931827f
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_arch_mode.txt
@@ -0,0 +1,21 @@
+# Issue 9737: verify that GOARM affects the computed build ID
+
+[short] skip
+
+# arm
+env GOOS=linux
+env GOARCH=arm
+env GOARM=5
+go install mycmd
+env GOARM=7
+stale mycmd
+
+
+-- go.mod --
+module mycmd
+
+go 1.16
+-- x.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_cache_compile.txt b/src/cmd/go/testdata/script/build_cache_compile.txt
new file mode 100644
index 0000000..64b391f
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_compile.txt
@@ -0,0 +1,21 @@
+env GO111MODULE=off
+[short] skip
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# Building trivial non-main package should run compiler the first time.
+go build -x lib.go
+stderr '(compile|gccgo)( |\.exe).*lib\.go'
+
+# ... but not again ...
+go build -x lib.go
+! stderr '(compile|gccgo)( |\.exe).*lib\.go'
+
+# ... unless we use -a.
+go build -a -x lib.go
+stderr '(compile|gccgo)( |\.exe)'
+
+-- lib.go --
+package lib
diff --git a/src/cmd/go/testdata/script/build_cache_disabled.txt b/src/cmd/go/testdata/script/build_cache_disabled.txt
new file mode 100644
index 0000000..8b005c8
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_disabled.txt
@@ -0,0 +1,50 @@
+# The build cache is required to build anything. It also may be needed to
+# initialize the build system, which is needed for commands like 'go env'.
+# However, there are lots of commands the cache is not needed for, and we
+# shouldn't require it when it won't be used.
+#
+# TODO(golang.org/issue/39882): commands below should work, too.
+# * go clean -modcache
+# * go env
+# * go fix
+# * go fmt
+# * go generate
+# * go get -d
+# * go list (without -export or -compiled)
+
+env GOCACHE=off
+
+# Commands that don't completely load packages should work.
+go doc fmt
+stdout Printf
+
+! go tool compile -h
+stderr usage:
+
+go version
+stdout '^go version'
+
+
+# Module commands that don't load packages should work.
+go mod init m
+exists go.mod
+
+go mod edit -require rsc.io/quote@v1.5.2
+
+go mod download rsc.io/quote
+
+go mod graph
+stdout rsc.io/quote
+
+go mod verify
+
+
+# Commands that load but don't build packages should work.
+go fmt .
+
+go doc .
+
+-- main.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_cache_gomips.txt b/src/cmd/go/testdata/script/build_cache_gomips.txt
new file mode 100644
index 0000000..0cbf16a
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_gomips.txt
@@ -0,0 +1,40 @@
+env GO111MODULE=off
+[short] skip # rebuilds std for mips
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# Building for mipsle without setting GOMIPS will use floating point registers.
+env GOARCH=mipsle
+env GOOS=linux
+go build -gcflags=-S f.go
+stderr ADDD.F[0-9]+,.F[0-9]+,.F[0-9]+
+
+# Clean cache
+go clean -cache
+
+# Building with GOMIPS=softfloat will not use floating point registers
+env GOMIPS=softfloat
+go build -gcflags=-S f.go
+! stderr ADDD.F[0-9]+,.F[0-9]+,.F[0-9]+
+
+# Clean cache
+go clean -cache
+
+# Build without setting GOMIPS
+env GOMIPS=
+go build -gcflags=-S f.go
+stderr ADDD.F[0-9]+,.F[0-9]+,.F[0-9]+
+
+# Building with GOMIPS should still not use floating point registers.
+env GOMIPS=softfloat
+go build -gcflags=-S f.go
+! stderr ADDD.F[0-9]+,.F[0-9]+,.F[0-9]+
+
+-- f.go --
+package f
+
+func F(x float64) float64 {
+     return x + x
+}
diff --git a/src/cmd/go/testdata/script/build_cache_link.txt b/src/cmd/go/testdata/script/build_cache_link.txt
new file mode 100644
index 0000000..b9c740a
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_link.txt
@@ -0,0 +1,26 @@
+env GO111MODULE=off
+[short] skip
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# Building a main package should run the compiler and linker ...
+go build -o $devnull -x main.go
+stderr '(compile|gccgo)( |\.exe).*main\.go'
+stderr '(link|gccgo)( |\.exe)'
+
+# ... and then the linker again ...
+go build -o $devnull -x main.go
+! stderr '(compile|gccgo)( |\.exe).*main\.go'
+stderr '(link|gccgo)( |\.exe)'
+
+# ... but the output binary can serve as a cache.
+go build -o main$GOEXE -x main.go
+stderr '(link|gccgo)( |\.exe)'
+go build -o main$GOEXE -x main.go
+! stderr '(link|gccgo)( |\.exe)'
+
+-- main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_cache_output.txt b/src/cmd/go/testdata/script/build_cache_output.txt
new file mode 100644
index 0000000..0d94bf6
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_output.txt
@@ -0,0 +1,67 @@
+env GO111MODULE=off
+env GODEBUG=gocachetest=1
+
+[!gc] skip
+[short] skip # clears cache, rebuilds too much
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# Building a trivial non-main package should run compiler the first time.
+go build -x -gcflags=-m lib.go
+stderr 'compile( |\.exe"?)'
+stderr 'lib.go:2.* can inline f'
+
+# ... but not the second, even though it still prints the compiler output.
+go build -x -gcflags=-m lib.go
+! stderr 'compile( |\.exe"?)'
+stderr 'lib.go:2.* can inline f'
+
+# Building a trivial main package should run the compiler and linker the first time.
+go build -x -gcflags=-m -ldflags='-v -w' main.go
+stderr 'compile( |\.exe"?)'
+stderr 'main.go:2.* can inline main' # from compiler
+stderr 'link(\.exe"?)? -'
+stderr '\d+ symbols' # from linker
+
+# ... but not the second, even though it still prints the compiler and linker output.
+go build -x -gcflags=-m -ldflags='-v -w' main.go
+! stderr 'compile( |\.exe"?)'
+stderr 'main.go:2.* can inline main' # from compiler
+! stderr 'link(\.exe"?)? -'
+stderr '\d+ symbols' # from linker
+
+# Running a test should run the compiler, linker, and the test the first time.
+go test -v -x -gcflags=-m -ldflags=-v p
+stderr 'compile( |\.exe"?)'
+stderr 'p_test.go:.*can inline Test' # from compile of p_test
+stderr 'testmain\.go:.*inlin' # from compile of testmain
+stderr 'link(\.exe"?)? -'
+stderr '\d+ symbols' # from linker
+stderr 'p\.test( |\.exe"?)'
+stdout 'TEST' # from test
+
+# ... but not the second, even though it still prints the compiler, linker, and test output.
+go test -v -x -gcflags=-m -ldflags=-v p
+! stderr 'compile( |\.exe"?)'
+stderr 'p_test.go:.*can inline Test' # from compile of p_test
+stderr 'testmain\.go:.*inlin' # from compile of testmain
+! stderr 'link(\.exe"?)? -'
+stderr '\d+ symbols' # from linker
+! stderr 'p\.test( |\.exe"?)'
+stdout 'TEST' # from test
+
+
+-- lib.go --
+package p
+func f(x *int) *int { return x }
+
+-- main.go --
+package main
+func main() {}
+
+-- p/p_test.go --
+package p
+import "testing"
+func Test(t *testing.T) {println("TEST")}
diff --git a/src/cmd/go/testdata/script/build_cache_trimpath.txt b/src/cmd/go/testdata/script/build_cache_trimpath.txt
new file mode 100644
index 0000000..9a4b9d7
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cache_trimpath.txt
@@ -0,0 +1,47 @@
+[short] skip
+env GO111MODULE=on
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+cd $WORK
+go build -o a.out
+
+# Varying -trimpath should cause a rebuild.
+go build -x -o a.out -trimpath
+stderr '(compile|gccgo)( |\.exe)'
+stderr 'link( |\.exe)'
+
+# Two distinct versions of the same module with identical content should
+# still be cached separately.
+# Verifies golang.org/issue/35412.
+go get -d example.com/stack@v1.0.0
+go run -trimpath printstack.go
+stdout '^example.com/stack@v1.0.0/stack.go$'
+go get -d example.com/stack@v1.0.1
+go run -trimpath printstack.go
+stdout '^example.com/stack@v1.0.1/stack.go$'
+
+-- $WORK/hello.go --
+package main
+func main() { println("hello") }
+
+-- $WORK/printstack.go --
+// +build ignore
+
+package main
+
+import (
+	"fmt"
+
+	"example.com/stack"
+)
+
+func main() {
+	fmt.Println(stack.TopFile())
+}
+-- $WORK/go.mod --
+module m
+
+go 1.14
diff --git a/src/cmd/go/testdata/script/build_cd_gopath_different.txt b/src/cmd/go/testdata/script/build_cd_gopath_different.txt
new file mode 100644
index 0000000..a7a4bf4
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cd_gopath_different.txt
@@ -0,0 +1,73 @@
+[gccgo] skip 'gccgo does not support -ldflags -X'
+env GO111MODULE=off
+go build run_go.go
+
+# Apply identity function to GOPATH
+exec ./run_go$GOEXE $GOPATH/src/my.pkg/main $GOPATH IDENTITY build -o $WORK/tmp/a.exe -ldflags -X=my.pkg.Text=linkXworked
+exec $WORK/tmp/a.exe
+stderr 'linkXworked'
+rm $WORK/tmp/a.exe
+
+[!windows] stop 'rest of the tests only apply to Windows'
+
+# Replace '\' with '/' in GOPATH
+exec ./run_go$GOEXE $GOPATH/src/my.pkg/main $GOPATH REPLACE_SLASH build -o $WORK/tmp/a.exe -ldflags -X=my.pkg.Text=linkXworked
+exec $WORK/tmp/a.exe
+stderr 'linkXworked'
+rm $WORK/tmp/a.exe
+
+# Apply identity function to GOPATH
+exec ./run_go$GOEXE $GOPATH/src/my.pkg/main $GOPATH UPPER build -o $WORK/tmp/a.exe -ldflags -X=my.pkg.Text=linkXworked
+exec $WORK/tmp/a.exe
+stderr 'linkXworked'
+rm $WORK/tmp/a.exe
+
+# Apply identity function to GOPATH
+exec ./run_go$GOEXE $GOPATH/src/my.pkg/main $GOPATH LOWER build -o $WORK/tmp/a.exe -ldflags -X=my.pkg.Text=linkXworked
+exec $WORK/tmp/a.exe
+stderr 'linkXworked'
+rm $WORK/tmp/a.exe
+
+-- run_go.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func main() {
+	dir := os.Args[1]
+	gopath := os.Args[2]
+	switch os.Args[3] {
+		case "IDENTITY":
+		case "REPLACE_SLASH": gopath = strings.ReplaceAll(gopath, `\`, `/`)
+		case "UPPER": gopath = strings.ToUpper(gopath)
+		case "LOWER": gopath = strings.ToLower(gopath)
+		default: fmt.Fprintln(os.Stderr, "bad op"); os.Exit(1)
+	}
+	cmd := exec.Command("go", os.Args[4:]...)
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+-- my.pkg/main/main.go --
+package main
+
+import "my.pkg"
+
+func main() {
+	println(pkg.Text)
+}
+-- my.pkg/pkg.go --
+package pkg
+
+var Text = "unset"
diff --git a/src/cmd/go/testdata/script/build_cgo_consistent_results.txt b/src/cmd/go/testdata/script/build_cgo_consistent_results.txt
new file mode 100644
index 0000000..88a24de
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_cgo_consistent_results.txt
@@ -0,0 +1,23 @@
+[short] skip
+[!cgo] skip
+
+[solaris] skip "skipping on Solaris; see golang.org/issue/13247"
+[illumos] skip "skipping on Solaris; see golang.org/issue/13247"
+
+go build -o $WORK/exe1$GOEXE cgotest
+go build -x -o $WORK/exe2$GOEXE cgotest
+
+# TODO(matloob): skip if stderr does not contain '-fdebug-prefix-map=\$WORK'
+
+cmp $WORK/exe1$GOEXE $WORK/exe2$GOEXE
+
+-- go.mod --
+module cgotest
+
+go 1.16
+-- m.go --
+package cgotest
+
+import "C"
+
+var _ C.int
diff --git a/src/cmd/go/testdata/script/build_darwin_cc_arch.txt b/src/cmd/go/testdata/script/build_darwin_cc_arch.txt
new file mode 100644
index 0000000..2b81b4c
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_darwin_cc_arch.txt
@@ -0,0 +1,24 @@
+# Test that we pass -arch flag to C compiler on Darwin (issue 43692).
+
+[!darwin] skip
+[!cgo] skip
+
+# clear CC, in case user sets it
+env CC=
+
+env CGO_ENABLED=1
+
+env GOARCH=amd64
+go build -n -x c.go
+stderr 'clang.*-arch x86_64'
+
+env GOARCH=arm64
+go build -n -x c.go
+stderr 'clang.*-arch arm64'
+
+-- c.go --
+package main
+
+import "C"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_dash_n_cgo.txt b/src/cmd/go/testdata/script/build_dash_n_cgo.txt
new file mode 100644
index 0000000..3f49ef6
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_dash_n_cgo.txt
@@ -0,0 +1,18 @@
+# Tests golang.org/issue/14944
+
+[!cgo] skip
+
+go build -n foo.go
+! stderr 'os.Stat .* no such file or directory' # there shouldn't be a stat of the archive file
+
+-- foo.go --
+package main
+
+/*
+#include <limits.h>
+*/
+import "C"
+
+func main() {
+        println(C.INT_MAX)
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/build_dash_o_dev_null.txt b/src/cmd/go/testdata/script/build_dash_o_dev_null.txt
new file mode 100644
index 0000000..e415fc2
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_dash_o_dev_null.txt
@@ -0,0 +1,13 @@
+# Issue #25579
+
+[short] skip
+
+go build -o $devnull hello.go
+! exists 'hello'$GOEXE
+
+-- hello.go --
+package main
+
+func main() {
+	println("hello, world")
+}
diff --git a/src/cmd/go/testdata/script/build_dash_x.txt b/src/cmd/go/testdata/script/build_dash_x.txt
new file mode 100644
index 0000000..6fd5bbe
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_dash_x.txt
@@ -0,0 +1,49 @@
+[short] skip
+[!cgo] skip
+
+[!exec:/usr/bin/env] skip
+[!exec:bash] skip
+[!exec:cat] skip
+
+mkdir $WORK/tmp/cache
+env GOCACHE=$WORK/tmp/cache
+
+# Before building our test main.go, ensure that an up-to-date copy of
+# runtime/cgo is present in the cache. If it isn't, the 'go build' step below
+# will fail with "can't open import". See golang.org/issue/29004.
+#
+# (The fix in golang.org/issue/29004 didn't completely fix the underlying issue:
+# cmd/go/internal/load adds a bunch of implicit dependencies
+# based on various heuristics, and, due to a bug described in
+# https://golang.org/issue/31544#issuecomment-490607180,
+# those implicit dependencies are not added early enough during
+# loading to properly affect the import graph.)
+go build runtime/cgo
+
+go build -x -o main main.go
+cp stderr commands.txt
+exec cat header.txt commands.txt
+cp stdout test.sh
+
+exec ./main
+cmp stderr hello.txt
+rm ./main
+
+exec /usr/bin/env bash -x test.sh
+exec ./main
+cmp stderr hello.txt
+
+grep '^WORK=(.*)\n' commands.txt
+
+-- main.go --
+package main
+
+import "C"
+
+func main() {
+	print("hello\n")
+}
+-- header.txt --
+set -e
+-- hello.txt --
+hello
diff --git a/src/cmd/go/testdata/script/build_exe.txt b/src/cmd/go/testdata/script/build_exe.txt
new file mode 100644
index 0000000..a994d17
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_exe.txt
@@ -0,0 +1,25 @@
+# go build with -o and -buildmode=exe should report an error on a non-main package.
+
+! go build -buildmode=exe -o out$GOEXE ./not_main
+stderr '-buildmode=exe requires exactly one main package'
+! exists out$GOEXE
+! go build -buildmode=exe -o out$GOEXE ./main_one ./main_two
+stderr '-buildmode=exe requires exactly one main package'
+! exists out$GOEXE
+
+-- go.mod --
+module m
+
+go 1.16
+-- not_main/not_main.go --
+package not_main
+
+func F() {}
+-- main_one/main_one.go --
+package main
+
+func main() {}
+-- main_two/main_two.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_gcflags.txt b/src/cmd/go/testdata/script/build_gcflags.txt
new file mode 100644
index 0000000..b472374
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_gcflags.txt
@@ -0,0 +1,22 @@
+env GO111MODULE=off
+
+# Test that the user can override default code generation flags.
+
+[gccgo] skip  # gccgo does not use -gcflags
+[!cgo] skip
+[!linux] skip  # test only works if c-archive implies -shared
+[short] skip
+
+env GOCACHE=$WORK/gocache  # Looking for compile commands, so need a clean cache.
+go build -x -n -buildmode=c-archive -gcflags=all=-shared=false ./override.go
+stderr '^.*/compile (.* )?-shared (.* )?-shared=false'
+
+-- override.go --
+package main
+
+import "C"
+
+//export GoFunc
+func GoFunc() {}
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_gopath_order.txt b/src/cmd/go/testdata/script/build_gopath_order.txt
new file mode 100644
index 0000000..caf2502
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_gopath_order.txt
@@ -0,0 +1,36 @@
+# golang.org/issue/14176#issuecomment-179895769
+# golang.org/issue/14192
+# -I arguments to compiler could end up not in GOPATH order,
+# leading to unexpected import resolution in the compiler.
+
+env GO111MODULE=off
+env GOPATH=$WORK/p1${:}$WORK/p2
+mkdir $WORK/p1/src/foo $WORK/p2/src/baz
+mkdir $WORK/p2/pkg/${GOOS}_${GOARCH} $WORK/p1/src/bar
+cp foo.go $WORK/p1/src/foo/foo.go
+cp baz.go $WORK/p2/src/baz/baz.go
+cp foo.a $WORK/p2/pkg/${GOOS}_${GOARCH}/foo.a
+cp bar.go $WORK/p1/src/bar/bar.go
+
+go install -x bar
+
+# add in baz.a to the mix
+mkdir $WORK/p1/pkg/${GOOS}_${GOARCH}
+cp baz.a $WORK/p1/pkg/${GOOS}_${GOARCH}/baz.a
+env GOPATH=$WORK/p1${:}$WORK/p2
+go install -x bar
+env GOPATH=$WORK/p2${:}$WORK/p1
+go install -x bar
+
+-- foo.go --
+package foo
+-- baz.go --
+package baz
+-- foo.a --
+bad
+-- baz.a --
+bad
+-- bar.go --
+package bar
+import _ "baz"
+import _ "foo"
diff --git a/src/cmd/go/testdata/script/build_i.txt b/src/cmd/go/testdata/script/build_i.txt
new file mode 100644
index 0000000..0e7ebed
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_i.txt
@@ -0,0 +1,41 @@
+env GO111MODULE=off
+
+# Test that 'go build -i' installs dependencies of the requested package.
+
+[short] skip
+
+# Since we are checking installation of dependencies, use a clean cache
+# to ensure that multiple runs of the test do not interfere.
+env GOCACHE=$WORK/cache
+
+# The initial 'go build -i' for bar should install its dependency foo.
+
+go build -v -i x/y/bar
+stderr 'x/y/foo'    # should be rebuilt
+go build -v -i x/y/bar
+! stderr 'x/y/foo'  # should already be installed
+
+# After modifying the source files, both packages should be rebuild.
+
+cp x/y/foo/foo.go.next x/y/foo/foo.go
+cp x/y/bar/bar.go.next x/y/bar/bar.go
+
+go build -v -i x/y/bar
+stderr 'x/y/foo'    # should be rebuilt
+go build -v -i x/y/bar
+! stderr 'x/y/foo'  # should already be installed
+
+-- x/y/foo/foo.go --
+package foo
+func F() {}
+-- x/y/bar/bar.go --
+package bar
+import "x/y/foo"
+func F() { foo.F() }
+-- x/y/foo/foo.go.next --
+package foo
+func F() { F() }
+-- x/y/bar/bar.go.next --
+package main
+import "x/y/foo"
+func main() { foo.F() }
diff --git a/src/cmd/go/testdata/script/build_i_deprecate.txt b/src/cmd/go/testdata/script/build_i_deprecate.txt
new file mode 100644
index 0000000..71356e5
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_i_deprecate.txt
@@ -0,0 +1,24 @@
+# Check that deprecation warnings are printed when the -i flag is used.
+# TODO(golang.org/issue/41696): remove the -i flag after Go 1.16, and this test.
+
+go build -n -i
+stderr '^go build: -i flag is deprecated$'
+
+go install -n -i
+stderr '^go install: -i flag is deprecated$'
+
+go test -n -i
+stderr '^go test: -i flag is deprecated$'
+
+
+# 'go clean -i' should not print a deprecation warning.
+# It will continue working.
+go clean -i .
+! stderr .
+
+-- go.mod --
+module m
+
+go 1.16
+-- m.go --
+package m
diff --git a/src/cmd/go/testdata/script/build_import_comment.txt b/src/cmd/go/testdata/script/build_import_comment.txt
new file mode 100644
index 0000000..b500340
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_import_comment.txt
@@ -0,0 +1,68 @@
+# Test in GOPATH mode first.
+env GO111MODULE=off
+cd m
+
+# Import comment matches
+go build -n works.go
+
+# Import comment mismatch
+! go build -n wrongplace.go
+stderr 'wrongplace expects import "my/x"'
+
+# Import comment syntax error
+! go build -n bad.go
+stderr 'cannot parse import comment'
+
+# Import comment conflict
+! go build -n conflict.go
+stderr 'found import comments'
+
+
+# Test in module mode.
+# We ignore import comments, so these commands should succeed.
+env GO111MODULE=on
+
+# Import comment matches
+go build -n works.go
+
+# Import comment mismatch
+go build -n wrongplace.go
+
+# Import comment syntax error
+go build -n bad.go
+
+# Import comment conflict
+go build -n conflict.go
+
+-- m/go.mod --
+module m
+
+go 1.16
+-- m/bad.go --
+package p
+
+import "m/bad"
+-- m/conflict.go --
+package p
+
+import "m/conflict"
+-- m/works.go --
+package p
+
+import _ "m/works/x"
+-- m/wrongplace.go --
+package p
+
+import "m/wrongplace"
+-- m/bad/bad.go --
+package bad // import
+-- m/conflict/a.go --
+package conflict // import "a"
+-- m/conflict/b.go --
+package conflict /* import "b" */
+-- m/works/x/x.go --
+package x // import "m/works/x"
+-- m/works/x/x1.go --
+package x // important! not an import comment
+-- m/wrongplace/x.go --
+package x // import "my/x"
diff --git a/src/cmd/go/testdata/script/build_import_cycle.txt b/src/cmd/go/testdata/script/build_import_cycle.txt
new file mode 100644
index 0000000..16e4e87
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_import_cycle.txt
@@ -0,0 +1,13 @@
+# mod_import_cycle covers this error in module mode.
+env GO111MODULE=off
+
+! go build selfimport
+stderr -count=1 'import cycle not allowed'
+
+go list -e -f '{{.Error}}' selfimport # Don't hang forever
+stdout -count=1 'import cycle not allowed'
+
+-- selfimport/selfimport.go --
+package selfimport
+
+import "selfimport"
diff --git a/src/cmd/go/testdata/script/build_internal.txt b/src/cmd/go/testdata/script/build_internal.txt
new file mode 100644
index 0000000..25aa18c
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_internal.txt
@@ -0,0 +1,63 @@
+# Test internal package errors are handled
+cd testinternal3
+go list .
+stdout 'testinternal3'
+
+# Test internal cache
+cd ../testinternal4
+! go build testinternal4/p
+stderr 'internal'
+
+# Test internal packages outside GOROOT are respected
+cd ../testinternal2
+! go build -v .
+stderr 'p\.go:3:8: use of internal package .*internal/w not allowed'
+
+[gccgo] skip # gccgo does not have GOROOT
+cd ../testinternal
+! go build -v .
+stderr 'p\.go:3:8: use of internal package net/http/internal not allowed'
+
+-- testinternal/go.mod --
+module testinternal
+
+go 1.16
+-- testinternal/p.go --
+package p
+
+import _ "net/http/internal"
+-- testinternal2/go.mod --
+module testinternal2
+
+go 1.16
+-- testinternal2/p.go --
+package p
+
+import _ "./x/y/z/internal/w"
+-- testinternal2/x/y/z/internal/w/w.go --
+package w
+-- testinternal3/go.mod --
+module testinternal3
+
+go 1.16
+-- testinternal3/t.go --
+package t
+
+import _ "internal/does-not-exist"
+-- testinternal4/go.mod --
+module testinternal4
+
+go 1.16
+-- testinternal4/p/p.go --
+package p
+
+import (
+	_ "testinternal4/q/internal/x"
+	_ "testinternal4/q/j"
+)
+-- testinternal4/q/internal/x/x.go --
+package x
+-- testinternal4/q/j/j.go --
+package j
+
+import _ "testinternal4/q/internal/x"
diff --git a/src/cmd/go/testdata/script/build_issue6480.txt b/src/cmd/go/testdata/script/build_issue6480.txt
new file mode 100644
index 0000000..cf1e9ea
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_issue6480.txt
@@ -0,0 +1,128 @@
+# "go test -c -test.bench=XXX errors" should not hang.
+# "go test -c" should also produce reproducible binaries.
+# "go test -c" should also appear to write a new binary every time,
+# even if it's really just updating the mtime on an existing up-to-date binary.
+
+[gccgo] skip
+[short] skip
+
+# Install some commands to compare mtimes
+env GOBIN=$WORK/tmp/bin
+go install m/now m/mtime m/before
+
+# Initial builds
+go test -c -test.bench=XXX errors
+go test -c -o errors2.test errors
+cmp errors.test$GOEXE errors2.test # // errors2.test has no exeSuffix because -o above doesn't have it
+
+# Check errors.test mtime is updated
+exec $GOBIN/now
+cp stdout start_time.txt
+go test -x -c -test.bench=XXX errors
+! stderr '[\\/]link|gccgo' # make sure up-to-date test binary is not relinked
+exec $GOBIN/mtime errors.test$GOEXE
+cp stdout errors1_mod_time.txt
+exec $GOBIN/before start_time.txt errors1_mod_time.txt
+rm start_time.txt errors1_mod_time.txt
+
+# Check errors2.test mtime is updated
+exec $GOBIN/now
+cp stdout start_time.txt
+go test -x -c -o errors2.test errors
+! stderr '[\\/]link|gccgo' # make sure up-to-date test binary is not relinked
+exec $GOBIN/mtime errors2.test
+cp stdout errors2_mod_time.txt
+exec $GOBIN/before start_time.txt errors2_mod_time.txt
+
+-- go.mod --
+module m
+
+go 1.16
+-- now/now.go --
+// Writes time.Now() to a file
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+)
+
+func main() {
+	if err := json.NewEncoder(os.Stdout).Encode(time.Now()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+-- mtime/mtime.go --
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+)
+
+func main() {
+	info, err := os.Stat(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.NewEncoder(os.Stdout).Encode(info.ModTime()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+-- before/before.go --
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+)
+
+func truncateLike(t, p time.Time) time.Time {
+	nano := p.UnixNano()
+	d := 1 * time.Nanosecond
+	for nano%int64(d) == 0 && d < 1*time.Second {
+		d *= 10
+	}
+	for nano%int64(d) == 0 && d < 2*time.Second {
+		d *= 2
+	}
+	return t.Truncate(d)
+}
+
+func main() {
+	var t1 time.Time
+	b1, err := os.ReadFile(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.Unmarshal(b1, &t1); err != nil  {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	var t2 time.Time
+	b2, err := os.ReadFile(os.Args[2])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.Unmarshal(b2, &t2); err != nil  {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	t1 = truncateLike(t1, t2)
+	if !t1.Before(t2) {
+		fmt.Fprintf(os.Stderr, "time in %v (%v) is not before time in %v (%v)", os.Args[1], t1, os.Args[2], t2)
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/go/testdata/script/build_link_x_import_path_escape.txt b/src/cmd/go/testdata/script/build_link_x_import_path_escape.txt
new file mode 100644
index 0000000..f1de1e4
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_link_x_import_path_escape.txt
@@ -0,0 +1,22 @@
+[gccgo] skip 'gccgo does not support -ldflags -X'
+
+go build -o linkx$GOEXE -ldflags -X=my.pkg.Text=linkXworked my.pkg/main
+exec ./linkx$GOEXE
+stderr '^linkXworked$'
+
+-- go.mod --
+module my.pkg
+
+go 1.16
+-- main/main.go --
+package main
+
+import "my.pkg"
+
+func main() {
+	println(pkg.Text)
+}
+-- pkg.go --
+package pkg
+
+var Text = "unset"
diff --git a/src/cmd/go/testdata/script/build_multi_main.txt b/src/cmd/go/testdata/script/build_multi_main.txt
new file mode 100644
index 0000000..8afd8b8
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_multi_main.txt
@@ -0,0 +1,43 @@
+# Verify build -o can output multiple executables to a directory.
+
+mkdir $WORK/bin
+go build -o $WORK/bin ./cmd/c1 ./cmd/c2
+! stderr 'multiple packages'
+
+! go build -o $WORK/bin ./pkg1 ./pkg1
+stderr 'no main packages'
+
+! go build ./cmd/c1
+stderr 'already exists and is a directory'
+
+# Verify build -o output correctly local packages
+mkdir $WORK/local
+go build -o $WORK/local ./exec.go
+exists $WORK/local/exec$GOEXE
+
+-- go.mod --
+module exmod
+
+-- cmd/c1/main.go --
+package main
+
+func main() {}
+
+-- cmd/c2/main.go --
+package main
+
+func main() {}
+
+-- pkg1/pkg1.go --
+package pkg1
+
+-- pkg2/pkg2.go --
+package pkg2
+
+-- exec.go --
+package main
+
+func main() {}
+
+-- c1$GOEXE/keep.txt --
+Create c1 directory.
diff --git a/src/cmd/go/testdata/script/build_n_cgo.txt b/src/cmd/go/testdata/script/build_n_cgo.txt
new file mode 100644
index 0000000..7aa77ae
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_n_cgo.txt
@@ -0,0 +1,17 @@
+[!cgo] skip
+
+# Test that nothing is prepended to $WORK path prefix.
+# See issue golang.org/issue/37012.
+go build -n
+! stderr '[/\\]\$WORK'
+
+-- go.mod --
+module m
+
+go 1.16
+-- main.go --
+package main
+
+import "C"
+
+var _ C.int
diff --git a/src/cmd/go/testdata/script/build_no_go.txt b/src/cmd/go/testdata/script/build_no_go.txt
new file mode 100644
index 0000000..b61d752
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_no_go.txt
@@ -0,0 +1,41 @@
+! go build ./empty/test
+stderr 'no non-test Go files in '
+
+! go build ./empty/xtest
+stderr 'no non-test Go files in '
+
+! go build ./empty/testxtest
+stderr 'no non-test Go files in '
+
+! go build ./exclude
+stderr 'build constraints exclude all Go files in '
+
+! go build ./exclude/ignore
+stderr 'no Go files in '
+
+! go build ./exclude/empty
+stderr 'no Go files in '
+
+-- go.mod --
+module m
+
+go 1.16
+-- empty/test/test_test.go --
+package p
+-- empty/testxtest/test_test.go --
+package p
+-- empty/testxtest/xtest_test.go --
+package p_test
+-- empty/xtest/xtest_test.go --
+package p_test
+-- exclude/empty/x.txt --
+-- exclude/ignore/_x.go --
+package x
+-- exclude/x.go --
+// +build linux,!linux
+
+package x
+-- exclude/x_linux.go --
+// +build windows
+
+package x
diff --git a/src/cmd/go/testdata/script/build_nocache.txt b/src/cmd/go/testdata/script/build_nocache.txt
new file mode 100644
index 0000000..1059cad
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_nocache.txt
@@ -0,0 +1,40 @@
+env GO111MODULE=off
+
+# As of Go 1.12, the module cache is required.
+
+# If none of the variables we use to locate GOCACHE are set, the cache is off
+# and we cannot build.
+env GOCACHE=
+env XDG_CACHE_HOME=
+env HOME=
+[plan9] env home=
+[windows] env LocalAppData=
+! go build -o triv triv.go
+stderr 'build cache is required, but could not be located: GOCACHE is not defined and .*'
+
+# If GOCACHE is set but is not an absolute path, and we cannot build.
+env GOCACHE=test
+! go build -o triv triv.go
+stderr 'build cache is required, but could not be located: GOCACHE is not an absolute path'
+
+# An explicit GOCACHE=off also disables builds.
+env GOCACHE=off
+! go build -o triv triv.go
+stderr 'build cache is disabled by GOCACHE=off'
+
+# If GOCACHE is set to an unwritable directory, we should diagnose it as such.
+[windows] stop # Does not support unwritable directories.
+[root] skip # Can write to unwritable directories.
+
+mkdir $WORK/unwritable/home
+chmod 0555 $WORK/unwritable/home
+[!plan9] env HOME=$WORK/unwritable/home
+[plan9] env home=$WORK/unwritable/home
+
+env GOCACHE=$WORK/unwritable/home
+! go build -o triv triv.go
+stderr 'failed to initialize build cache.* permission denied'
+
+-- triv.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/build_output.txt b/src/cmd/go/testdata/script/build_output.txt
new file mode 100644
index 0000000..1e82950
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_output.txt
@@ -0,0 +1,117 @@
+[gccgo] skip 'gccgo has no standard packages'
+[short] skip
+
+[!windows] env NONEXE='.exe'
+[windows] env NONEXE=''
+
+env GOBIN=$WORK/tmp/bin
+go install m/isarchive &
+
+go build x.go
+exists -exec x$GOEXE
+rm x$GOEXE
+! exists x$NONEXE
+
+go build -o myprog x.go
+! exists x
+! exists x.exe
+exists -exec myprog
+! exists myprogr.exe
+
+! exists bin
+go build -o bin/x x.go
+exists -exec bin/x
+rm bin
+
+! exists bin
+go build -o bin/ x.go
+exists -exec bin/x$GOEXE
+rm bin
+
+[windows] ! exists bin
+[windows] go build -o bin\x x.go
+[windows] exists -exec bin\x
+[windows] rm bin
+
+[windows] ! exists bin
+[windows] go build -o bin\ x.go
+[windows] exists -exec bin\x.exe
+[windows] rm bin
+
+! exists bin
+mkdir bin
+go build -o bin x.go
+exists -exec bin/x$GOEXE
+rm bin
+
+go build p.go
+! exists p
+! exists p.a
+! exists p.o
+! exists p.exe
+
+wait # for isarchive
+
+go build -o p.a p.go
+exists p.a
+exec $GOBIN/isarchive p.a
+
+go build cmd/gofmt
+exists -exec gofmt$GOEXE
+rm gofmt$GOEXE
+! exists gofmt$NONEXE
+
+go build -o mygofmt cmd/gofmt
+exists -exec mygofmt
+! exists mygofmt.exe
+! exists gofmt
+! exists gofmt.exe
+
+go build sync/atomic
+! exists atomic
+! exists atomic.exe
+
+go build -o myatomic.a sync/atomic
+exists myatomic.a
+exec $GOBIN/isarchive myatomic.a
+! exists atomic
+! exists atomic.a
+! exists atomic.exe
+
+! go build -o whatever cmd/gofmt sync/atomic
+stderr 'multiple packages'
+
+-- go.mod --
+module m
+
+go 1.16
+-- x.go --
+package main
+
+func main() {}
+-- p.go --
+package p
+-- isarchive/isarchive.go --
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io"
+	"os"
+)
+
+func main() {
+	f, err := os.Open(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	buf := make([]byte, 100)
+	io.ReadFull(f, buf)
+	f.Close()
+	if !bytes.HasPrefix(buf, []byte("!<arch>\n")) {
+		fmt.Fprintf(os.Stderr, "file %s exists but is not an archive\n", os.Args[1])
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/go/testdata/script/build_overlay.txt b/src/cmd/go/testdata/script/build_overlay.txt
new file mode 100644
index 0000000..b11cd96
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_overlay.txt
@@ -0,0 +1,308 @@
+[short] skip
+
+# Test building in overlays.
+# TODO(#39958): add a test case where the destination file in the replace map
+#   isn't a go file. Either completely exclude that case in fs.IsDirWithGoFiles
+#   if the compiler doesn't allow it, or test that it works all the way.
+# TODO(#39958): add a test that both gc and gccgo assembly files can include .h
+#   files.
+
+# The main package (m) is contained in an overlay. It imports m/dir2 which has one
+# file in an overlay and one file outside the overlay, which in turn imports m/dir,
+# which only has source files in the overlay.
+
+cd m
+
+! go build .
+go build -overlay overlay.json -o main$GOEXE .
+exec ./main$goexe
+stdout '^hello$'
+
+go build -overlay overlay.json -o print_abspath$GOEXE ./printpath
+exec ./print_abspath$GOEXE
+stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go
+
+go build -overlay overlay.json -o print_trimpath$GOEXE -trimpath ./printpath
+exec ./print_trimpath$GOEXE
+stdout ^m[/\\]printpath[/\\]main.go
+
+go build -overlay overlay.json -o print_trimpath_two_files$GOEXE printpath/main.go printpath/other.go
+exec ./print_trimpath_two_files$GOEXE
+stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go
+stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]other.go
+
+go build -overlay overlay.json -o main_cgo_replace$GOEXE ./cgo_hello_replace
+exec ./main_cgo_replace$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -overlay overlay.json -o main_cgo_quote$GOEXE ./cgo_hello_quote
+exec ./main_cgo_quote$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -overlay overlay.json -o main_cgo_angle$GOEXE ./cgo_hello_angle
+exec ./main_cgo_angle$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -overlay overlay.json -o main_call_asm$GOEXE ./call_asm
+exec ./main_call_asm$GOEXE
+! stdout .
+
+# Change the contents of a file in the overlay and ensure that makes the target stale
+go install -overlay overlay.json ./test_cache
+go list -overlay overlay.json -f '{{.Stale}}' ./test_cache
+stdout '^false$'
+cp overlay/test_cache_different.go overlay/test_cache.go
+go list -overlay overlay.json -f '{{.Stale}}' ./test_cache
+stdout '^true$'
+
+go list -compiled -overlay overlay.json -f '{{range .CompiledGoFiles}}{{. | printf "%s\n"}}{{end}}' ./cgo_hello_replace
+cp stdout compiled_cgo_sources.txt
+go run ../print_line_comments.go compiled_cgo_sources.txt
+stdout $GOPATH[/\\]src[/\\]m[/\\]cgo_hello_replace[/\\]cgo_hello_replace.go
+! stdout $GOPATH[/\\]src[/\\]m[/\\]overlay[/\\]hello.c
+
+# Run same tests but with gccgo.
+env GO111MODULE=off
+[!exec:gccgo] stop
+
+! go build -compiler=gccgo .
+go build -compiler=gccgo -overlay overlay.json -o main_gccgo$GOEXE .
+exec ./main_gccgo$goexe
+stdout '^hello$'
+
+go build -compiler=gccgo -overlay overlay.json -o print_abspath_gccgo$GOEXE ./printpath
+exec ./print_abspath_gccgo$GOEXE
+stdout $WORK[/\\]gopath[/\\]src[/\\]m[/\\]printpath[/\\]main.go
+
+go build -compiler=gccgo -overlay overlay.json -o print_trimpath_gccgo$GOEXE -trimpath ./printpath
+exec ./print_trimpath_gccgo$GOEXE
+stdout ^\.[/\\]printpath[/\\]main.go
+
+
+go build -compiler=gccgo  -overlay overlay.json -o main_cgo_replace_gccgo$GOEXE ./cgo_hello_replace
+exec ./main_cgo_replace_gccgo$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -compiler=gccgo  -overlay overlay.json -o main_cgo_quote_gccgo$GOEXE ./cgo_hello_quote
+exec ./main_cgo_quote_gccgo$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -compiler=gccgo  -overlay overlay.json -o main_cgo_angle_gccgo$GOEXE ./cgo_hello_angle
+exec ./main_cgo_angle_gccgo$GOEXE
+stdout '^hello cgo\r?\n'
+
+go build -compiler=gccgo -overlay overlay.json -o main_call_asm_gccgo$GOEXE ./call_asm
+exec ./main_call_asm_gccgo$GOEXE
+! stdout .
+
+
+-- m/go.mod --
+// TODO(matloob): how do overlays work with go.mod (especially if mod=readonly)
+module m
+
+go 1.16
+
+-- m/dir2/h.go --
+package dir2
+
+func PrintMessage() {
+	printMessage()
+}
+-- m/dir/foo.txt --
+The build action code currently expects the package directory
+to exist, so it can run the compiler in that directory.
+TODO(matloob): Remove this requirement.
+-- m/printpath/about.txt --
+the actual code is in the overlay
+-- m/overlay.json --
+{
+	"Replace": {
+		"f.go": "overlay/f.go",
+		"dir/g.go": "overlay/dir_g.go",
+		"dir2/i.go": "overlay/dir2_i.go",
+		"printpath/main.go": "overlay/printpath.go",
+		"printpath/other.go": "overlay2/printpath2.go",
+		"call_asm/asm_gc.s": "overlay/asm_gc.s",
+		"call_asm/asm_gccgo.s": "overlay/asm_gccgo.s",
+		"test_cache/main.go": "overlay/test_cache.go",
+		"cgo_hello_replace/cgo_header.h": "overlay/cgo_head.h",
+		"cgo_hello_replace/hello.c": "overlay/hello.c",
+		"cgo_hello_quote/cgo_hello.go": "overlay/cgo_hello_quote.go",
+		"cgo_hello_quote/cgo_header.h": "overlay/cgo_head.h",
+		"cgo_hello_angle/cgo_hello.go": "overlay/cgo_hello_angle.go",
+		"cgo_hello_angle/cgo_header.h": "overlay/cgo_head.h"
+	}
+}
+-- m/cgo_hello_replace/cgo_hello_replace.go --
+package main
+
+// #include "cgo_header.h"
+import "C"
+
+func main() {
+	C.say_hello()
+}
+-- m/cgo_hello_replace/cgo_header.h --
+ // Test that this header is replaced with one that has the proper declaration.
+void say_goodbye();
+
+-- m/cgo_hello_replace/hello.c --
+#include <stdio.h>
+
+void say_goodbye() { puts("goodbye cgo\n"); fflush(stdout); }
+
+-- m/overlay/f.go --
+package main
+
+import "m/dir2"
+
+func main() {
+	dir2.PrintMessage()
+}
+-- m/call_asm/main.go --
+package main
+
+func foo() // There will be a "missing function body" error if the assembly file isn't found.
+
+func main() {
+	foo()
+}
+-- m/overlay/dir_g.go --
+package dir
+
+import "fmt"
+
+func PrintMessage() {
+	fmt.Println("hello")
+}
+-- m/overlay/printpath.go --
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+	"runtime"
+)
+
+func main() {
+	_, file, _, _ := runtime.Caller(0)
+
+	// Since https://golang.org/cl/214286, the runtime's debug paths are
+	// slash-separated regardless of platform, so normalize them to system file
+	// paths.
+	fmt.Println(filepath.FromSlash(file))
+}
+-- m/overlay2/printpath2.go --
+package main
+
+import (
+	"fmt"
+	"path/filepath"
+	"runtime"
+)
+
+func init() {
+	_, file, _, _ := runtime.Caller(0)
+	fmt.Println(filepath.FromSlash(file))
+}
+-- m/overlay/dir2_i.go --
+package dir2
+
+import "m/dir"
+
+func printMessage() {
+	dir.PrintMessage()
+}
+-- m/overlay/cgo_hello_quote.go --
+package main
+
+// #include "cgo_header.h"
+import "C"
+
+func main() {
+	C.say_hello()
+}
+-- m/overlay/cgo_hello_angle.go --
+package main
+
+// #include <cgo_header.h>
+import "C"
+
+func main() {
+	C.say_hello()
+}
+-- m/overlay/cgo_head.h --
+void say_hello();
+-- m/overlay/hello.c --
+#include <stdio.h>
+
+void say_hello() { puts("hello cgo\n"); fflush(stdout); }
+-- m/overlay/asm_gc.s --
+// +build !gccgo
+
+TEXT ·foo(SB),0,$0
+	RET
+
+-- m/overlay/asm_gccgo.s --
+// +build gccgo
+
+.globl main.foo
+.text
+main.foo:
+	ret
+
+-- m/overlay/test_cache.go --
+package foo
+
+import "fmt"
+
+func bar() {
+	fmt.Println("something")
+}
+-- m/overlay/test_cache_different.go --
+package foo
+
+import "fmt"
+
+func bar() {
+	fmt.Println("different")
+}
+-- m/cgo_hello_quote/hello.c --
+#include <stdio.h>
+
+void say_hello() { puts("hello cgo\n"); fflush(stdout); }
+-- m/cgo_hello_angle/hello.c --
+#include <stdio.h>
+
+void say_hello() { puts("hello cgo\n"); fflush(stdout); }
+
+-- print_line_comments.go --
+package main
+
+import (
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"strings"
+)
+
+func main() {
+	compiledGoFilesArg := os.Args[1]
+	b, err := ioutil.ReadFile(compiledGoFilesArg)
+	if err != nil {
+		log.Fatal(err)
+	}
+	compiledGoFiles := strings.Split(strings.TrimSpace(string(b)), "\n")
+	for _, f := range compiledGoFiles {
+		b, err := ioutil.ReadFile(f)
+		if err != nil {
+			log.Fatal(err)
+		}
+		for _, line := range strings.Split(string(b), "\n") {
+			if strings.HasPrefix(line, "#line") || strings.HasPrefix(line, "//line") {
+				fmt.Println(line)
+			}
+		}
+	}
+}
diff --git a/src/cmd/go/testdata/script/build_package_not_stale_trailing_slash.txt b/src/cmd/go/testdata/script/build_package_not_stale_trailing_slash.txt
new file mode 100644
index 0000000..38a151e
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_package_not_stale_trailing_slash.txt
@@ -0,0 +1,13 @@
+# Tests Issue #12690
+
+[gccgo] skip 'gccgo does not have GOROOT'
+
+! stale runtime
+! stale os
+! stale io
+
+env GOROOT=$GOROOT'/'
+
+! stale runtime
+! stale os
+! stale io
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/build_patterns_outside_gopath.txt b/src/cmd/go/testdata/script/build_patterns_outside_gopath.txt
new file mode 100644
index 0000000..6a600cf
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_patterns_outside_gopath.txt
@@ -0,0 +1,36 @@
+# Tests issue #18778
+[short] skip
+
+cd pkgs
+
+env GO111MODULE=off
+go build ./...
+! stdout .
+go test ./...
+stdout '^ok'
+go list ./...
+stdout 'pkgs$'
+stdout 'pkgs/a'
+
+-- pkgs/go.mod --
+module pkgs
+
+go 1.16
+-- pkgs/a.go --
+package x
+-- pkgs/a_test.go --
+package x_test
+
+import "testing"
+
+func TestX(t *testing.T) {
+}
+-- pkgs/a/a.go --
+package a
+-- pkgs/a/a_test.go --
+package a_test
+
+import "testing"
+
+func TestA(t *testing.T) {
+}
diff --git a/src/cmd/go/testdata/script/build_plugin_non_main.txt b/src/cmd/go/testdata/script/build_plugin_non_main.txt
new file mode 100644
index 0000000..e0bbbef
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_plugin_non_main.txt
@@ -0,0 +1,13 @@
+# Plugins are not supported on all platforms.
+[!buildmode:plugin] skip
+
+go build -n testdep
+! go build -buildmode=plugin testdep
+stderr '-buildmode=plugin requires exactly one main package'
+
+-- go.mod --
+module testdep
+
+go 1.16
+-- testdep.go --
+package p
diff --git a/src/cmd/go/testdata/script/build_relative_pkgdir.txt b/src/cmd/go/testdata/script/build_relative_pkgdir.txt
new file mode 100644
index 0000000..0716bcd
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_relative_pkgdir.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=off
+
+# Regression test for golang.org/issue/21309: accept relative -pkgdir argument.
+
+[short] skip
+
+mkdir $WORK/gocache
+env GOCACHE=$WORK/gocache
+go build -i -pkgdir=. runtime
diff --git a/src/cmd/go/testdata/script/build_relative_tmpdir.txt b/src/cmd/go/testdata/script/build_relative_tmpdir.txt
new file mode 100644
index 0000000..3e98a67
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_relative_tmpdir.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=off
+
+# If GOTMPDIR is relative, 'go build' should derive an absolute $WORK directory.
+cd $WORK
+mkdir tmp
+env GOTMPDIR=tmp
+go build -work a
+stderr 'WORK=\$WORK' # the test script itself converts the absolute directory back to $WORK
+
+# Similarly if TMP/TMPDIR is relative.
+env GOTMPDIR=
+env TMP=tmp    # Windows
+env TMPDIR=tmp # Unix
+go build -work a
+stderr 'WORK=\$WORK'
+
+-- a/a.go --
+package a
diff --git a/src/cmd/go/testdata/script/build_runtime_gcflags.txt b/src/cmd/go/testdata/script/build_runtime_gcflags.txt
new file mode 100644
index 0000000..da1b65f
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_runtime_gcflags.txt
@@ -0,0 +1,11 @@
+env GO111MODULE=off
+[short] skip # rebuilds all of std
+
+# Set up fresh GOCACHE.
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+# Verify the standard library (specifically runtime/internal/atomic) can be
+# built with -gcflags when -n is given. See golang.org/issue/29346.
+go build -n -gcflags=all='-l' std
+stderr 'compile.* -l .* runtime/internal/atomic'
diff --git a/src/cmd/go/testdata/script/build_tag_goexperiment.txt b/src/cmd/go/testdata/script/build_tag_goexperiment.txt
new file mode 100644
index 0000000..26ad029
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_tag_goexperiment.txt
@@ -0,0 +1,104 @@
+# compile_ext will fail if the buildtags that are enabled (or not enabled) for the
+# framepointer and fieldtrack experiments are not consistent with the value of
+# GOEXPSTRING (which comes from objabi.Expstring()).
+
+[short] skip
+go run m
+
+-- expt_main.go --
+package main
+
+import (
+	"os"
+	"strings"
+)
+
+func main() {
+  fp()
+  ft()
+}
+
+func hasExpEntry(s string) bool {
+	// script_test.go defines GOEXPSTRING to be the value of
+	// objabi.Expstring(), which gives the enabled experiments baked into the
+	// toolchain.
+	g := os.Getenv("GOEXPSTRING")
+	for _, f := range strings.Split(g, ",") {
+		if f == s {
+			return true
+		}
+	}
+	return false
+}
+
+-- fp_off.go --
+// +build !goexperiment.framepointer
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func fp() {
+	if hasExpEntry("framepointer") {
+		fmt.Println("in !framepointer build, but objabi.Expstring() has 'framepointer'")
+		os.Exit(1)
+	}
+}
+
+-- fp_on.go --
+// +build goexperiment.framepointer
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func fp() {
+	if !hasExpEntry("framepointer") {
+		fmt.Println("in framepointer build, but objabi.Expstring() does not have 'framepointer', is", os.Getenv("GOEXPSTRING"))
+		os.Exit(1)
+	}
+}
+
+-- ft_off.go --
+// +build !goexperiment.fieldtrack
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func ft() {
+	if hasExpEntry("fieldtrack") {
+		fmt.Println("in !fieldtrack build, but objabi.Expstring() has 'fieldtrack'")
+		os.Exit(1)
+	}
+}
+
+-- ft_on.go --
+// +build goexperiment.fieldtrack
+
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func ft() {
+	if !hasExpEntry("fieldtrack") {
+		fmt.Println("in fieldtrack build, but objabi.Expstring() does not have 'fieldtrack', is", os.Getenv("GOEXPSTRING"))
+		os.Exit(1)
+	}
+}
+
+-- go.mod --
+module m
+go 1.14
diff --git a/src/cmd/go/testdata/script/build_tags_no_comma.txt b/src/cmd/go/testdata/script/build_tags_no_comma.txt
new file mode 100644
index 0000000..f3eb282
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_tags_no_comma.txt
@@ -0,0 +1,4 @@
+[gccgo] skip 'gccgo has no standard packages'
+go build -tags 'tag1 tag2' math
+! go build -tags 'tag1,tag2 tag3' math
+stderr 'space-separated list contains comma'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/build_test_only.txt b/src/cmd/go/testdata/script/build_test_only.txt
new file mode 100644
index 0000000..8693a80
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_test_only.txt
@@ -0,0 +1,19 @@
+# Named explicitly, test-only packages should be reported as
+# unbuildable/uninstallable, even if there is a wildcard also matching.
+! go build m/testonly m/testonly...
+stderr 'no non-test Go files in'
+! go install ./testonly
+stderr 'no non-test Go files in'
+
+# Named through a wildcard, the test-only packages should be silently ignored.
+go build m/testonly...
+go install ./testonly...
+
+-- go.mod --
+module m
+
+go 1.16
+-- testonly/t_test.go --
+package testonly
+-- testonly2/t.go --
+package testonly2
diff --git a/src/cmd/go/testdata/script/build_trimpath.txt b/src/cmd/go/testdata/script/build_trimpath.txt
new file mode 100644
index 0000000..2c3bee8
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_trimpath.txt
@@ -0,0 +1,162 @@
+[short] skip
+
+# If GOROOT_FINAL is set, 'go build -trimpath' bakes that into the resulting
+# binary instead of GOROOT. Explicitly unset it here.
+env GOROOT_FINAL=
+
+# Set up two identical directories that can be used as GOPATH.
+env GO111MODULE=on
+mkdir $WORK/a/src/paths $WORK/b/src/paths
+cp paths.go $WORK/a/src/paths
+cp paths.go $WORK/b/src/paths
+cp overlay.json $WORK/a/src/paths
+cp overlay.json $WORK/b/src/paths
+cp go.mod $WORK/a/src/paths/
+cp go.mod $WORK/b/src/paths/
+
+
+# A binary built without -trimpath should contain the module root dir
+# and GOROOT for debugging and stack traces.
+cd $WORK/a/src/paths
+go build -o $WORK/paths-dbg.exe .
+exec $WORK/paths-dbg.exe $WORK/paths-dbg.exe
+stdout 'binary contains module root: true'
+stdout 'binary contains GOROOT: true'
+
+# A binary built with -trimpath should not contain the current workspace
+# or GOROOT.
+go build -trimpath -o $WORK/paths-a.exe .
+exec $WORK/paths-a.exe $WORK/paths-a.exe
+stdout 'binary contains module root: false'
+stdout 'binary contains GOROOT: false'
+
+# A binary from an external module built with -trimpath should not contain
+# the current workspace or GOROOT.
+go get -trimpath rsc.io/fortune
+exec $WORK/paths-a.exe $GOPATH/bin/fortune$GOEXE
+stdout 'binary contains module root: false'
+stdout 'binary contains GOROOT: false'
+go mod edit -droprequire rsc.io/fortune
+
+# Two binaries built from identical packages in different directories
+# should be identical.
+cd $WORK/b/src/paths
+go build -trimpath -o $WORK/paths-b.exe
+cmp -q $WORK/paths-a.exe $WORK/paths-b.exe
+
+
+# Same sequence of tests but with overlays.
+# A binary built without -trimpath should contain the module root dir
+# and GOROOT for debugging and stack traces.
+cd $WORK/a/src/paths
+go build -overlay overlay.json -o $WORK/paths-dbg.exe ./overlaydir
+exec $WORK/paths-dbg.exe $WORK/paths-dbg.exe
+stdout 'binary contains module root: true'
+stdout 'binary contains GOROOT: true'
+
+# A binary built with -trimpath should not contain the current workspace
+# or GOROOT.
+go build -overlay overlay.json -trimpath -o $WORK/paths-a.exe ./overlaydir
+exec $WORK/paths-a.exe $WORK/paths-a.exe
+stdout 'binary contains module root: false'
+stdout 'binary contains GOROOT: false'
+
+# Two binaries built from identical packages in different directories
+# should be identical.
+cd $WORK/b/src/paths
+go build -overlay overlay.json -trimpath -o $WORK/paths-b.exe ./overlaydir
+cmp -q $WORK/paths-a.exe $WORK/paths-b.exe
+
+
+# Same sequence of tests but in GOPATH mode.
+# A binary built without -trimpath should contain GOPATH and GOROOT.
+env GO111MODULE=off
+cd $WORK
+env GOPATH=$WORK/a
+go build -o paths-dbg.exe paths
+exec ./paths-dbg.exe paths-dbg.exe
+stdout 'binary contains GOPATH: true'
+stdout 'binary contains GOROOT: true'
+
+# A binary built with -trimpath should not contain GOPATH or GOROOT.
+go build -trimpath -o paths-a.exe paths
+exec ./paths-a.exe paths-a.exe
+stdout 'binary contains GOPATH: false'
+stdout 'binary contains GOROOT: false'
+
+# Two binaries built from identical packages in different GOPATH roots
+# should be identical.
+env GOPATH=$WORK/b
+go build -trimpath -o paths-b.exe paths
+cmp -q paths-a.exe paths-b.exe
+
+
+# Same sequence of tests but with gccgo.
+# gccgo does not support builds in module mode.
+[!exec:gccgo] stop
+env GOPATH=$WORK/a
+
+# A binary built with gccgo without -trimpath should contain the current
+# GOPATH and GOROOT.
+go build -compiler=gccgo -o paths-dbg.exe paths
+exec ./paths-dbg.exe paths-dbg.exe
+stdout 'binary contains GOPATH: true'
+stdout 'binary contains GOROOT: false' # gccgo doesn't load std from GOROOT.
+
+# A binary built with gccgo with -trimpath should not contain GOPATH or GOROOT.
+go build -compiler=gccgo -trimpath -o paths-a.exe paths
+exec ./paths-a.exe paths-a.exe
+stdout 'binary contains GOPATH: false'
+stdout 'binary contains GOROOT: false'
+
+# Two binaries built from identical packages in different directories
+# should be identical.
+env GOPATH=$WORK/b
+go build -compiler=gccgo -trimpath -o paths-b.exe paths
+cmp -q paths-a.exe paths-b.exe
+
+-- paths.go --
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+func main() {
+	exe := os.Args[1]
+	data, err := ioutil.ReadFile(exe)
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	if os.Getenv("GO111MODULE") == "on" {
+		out, err := exec.Command("go", "env", "GOMOD").Output()
+		if err != nil {
+			log.Fatal(err)
+		}
+		modRoot := filepath.Dir(strings.TrimSpace(string(out)))
+		check(data, "module root", modRoot)
+	} else {
+		check(data, "GOPATH", os.Getenv("GOPATH"))
+	}
+	check(data, "GOROOT", os.Getenv("GOROOT"))
+}
+
+func check(data []byte, desc, dir string) {
+	containsDir := bytes.Contains(data, []byte(dir))
+	containsSlashDir := bytes.Contains(data, []byte(filepath.ToSlash(dir)))
+	fmt.Printf("binary contains %s: %v\n", desc, containsDir || containsSlashDir)
+}
+-- overlay.json --
+{ "Replace": { "overlaydir/paths.go": "paths.go" } }
+-- go.mod --
+module paths
+
+go 1.14
diff --git a/src/cmd/go/testdata/script/build_trimpath_cgo.txt b/src/cmd/go/testdata/script/build_trimpath_cgo.txt
new file mode 100644
index 0000000..3187b4d
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_trimpath_cgo.txt
@@ -0,0 +1,184 @@
+# This test builds a cgo binary and verifies the source directory path
+# does not appear in the binary, either literally or in compressed DWARF.
+# TODO(golang.org/issue/36072): ideally we should build a binary from identical
+# sources in different directories and verify the binary and all intermediate
+# files are identical.
+
+[short] skip
+[!cgo] skip
+
+# Check that the source path appears when -trimpath is not used.
+go build -o hello.exe .
+grep -q gopath[/\\]src hello.exe
+go run ./list-dwarf hello.exe
+stdout gopath[/\\]src
+
+# Check that the source path does not appear when -trimpath is used.
+[aix] stop # can't inspect XCOFF binaries
+go build -trimpath -o hello.exe .
+! grep -q gopath[/\\]src hello.exe
+go run ./list-dwarf hello.exe
+! stdout gopath/src
+
+
+# Do the above, with the cgo (but not .c) sources in an overlay
+# Check that the source path appears when -trimpath is not used.
+mkdir $WORK/overlay
+cp hello.go $WORK/overlay/hello.go
+mkdir hello_overlay
+cp hello.c hello_overlay/hello.c
+go build -overlay overlay.json -o hello_overlay.exe ./hello_overlay
+grep -q gopath[/\\]src hello_overlay.exe
+! grep -q $WORK[/\\]overlay hello_overlay.exe
+go run ./list-dwarf hello_overlay.exe
+stdout gopath[/\\]src
+! stdout $WORK[/\\]overlay
+
+# Check that the source path does not appear when -trimpath is used.
+go build -overlay overlay.json -trimpath -o hello_overlay.exe ./hello_overlay
+! grep -q gopath[/\\]src hello_overlay.exe
+! grep -q $WORK[/\\]overlay hello_overlay.exe
+go run ./list-dwarf hello_overlay.exe
+! stdout gopath/src
+! stdout $WORK[/\\]overlay
+
+-- go.mod --
+module m
+
+go 1.14
+-- overlay.json --
+{
+	"Replace": {
+		"hello_overlay/hello.go": "../../overlay/hello.go"
+	}
+}
+-- hello.c --
+#include <stdio.h>
+
+void say_hello() { puts("Hello, world!\n"); }
+
+-- hello.go --
+package main
+
+// void say_hello();
+import "C"
+
+func main() {
+	C.say_hello()
+}
+
+-- list-dwarf/list-dwarf.go --
+package main
+
+import (
+	"debug/dwarf"
+	"fmt"
+	"io"
+	"log"
+	"os"
+	"sort"
+)
+
+func main() {
+	files, err := run(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	for _, file := range files {
+		fmt.Println(file)
+	}
+}
+
+func run(exePath string) ([]string, error) {
+	dwarfData, err := readDWARF(exePath)
+	if err != nil {
+		return nil, err
+	}
+
+	dwarfReader := dwarfData.Reader()
+	files := make(map[string]bool)
+	for {
+		e, err := dwarfReader.Next()
+		if err != nil {
+			return nil, err
+		}
+		if e == nil {
+			break
+		}
+		lr, err := dwarfData.LineReader(e)
+		if err != nil {
+			return nil, err
+		}
+		if lr == nil {
+			continue
+		}
+
+		var le dwarf.LineEntry
+		for {
+			if err := lr.Next(&le); err != nil {
+				if err == io.EOF {
+					break
+				}
+				return nil, err
+			}
+			files[le.File.Name] = true
+		}
+	}
+
+	sortedFiles := make([]string, 0, len(files))
+	for file := range files {
+		sortedFiles = append(sortedFiles, file)
+	}
+	sort.Strings(sortedFiles)
+	return sortedFiles, nil
+}
+-- list-dwarf/read_darwin.go --
+package main
+
+import (
+	"debug/dwarf"
+	"debug/macho"
+)
+
+func readDWARF(exePath string) (*dwarf.Data, error) {
+	machoFile, err := macho.Open(exePath)
+	if err != nil {
+		return nil, err
+	}
+	defer machoFile.Close()
+	return machoFile.DWARF()
+}
+-- list-dwarf/read_elf.go --
+// +build android dragonfly freebsd illumos linux netbsd openbsd solaris
+
+package main
+
+import (
+	"debug/dwarf"
+	"debug/elf"
+)
+
+func readDWARF(exePath string) (*dwarf.Data, error) {
+	elfFile, err := elf.Open(exePath)
+	if err != nil {
+		return nil, err
+	}
+	defer elfFile.Close()
+	return elfFile.DWARF()
+}
+-- list-dwarf/read_windows.go --
+package main
+
+import (
+	"debug/dwarf"
+	"debug/pe"
+)
+
+func readDWARF(exePath string) (*dwarf.Data, error) {
+	peFile, err := pe.Open(exePath)
+	if err != nil {
+		return nil, err
+	}
+	defer peFile.Close()
+	return peFile.DWARF()
+}
diff --git a/src/cmd/go/testdata/script/build_unsupported_goos.txt b/src/cmd/go/testdata/script/build_unsupported_goos.txt
new file mode 100644
index 0000000..d61e420
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_unsupported_goos.txt
@@ -0,0 +1,6 @@
+[gccgo] skip # gccgo assumes cross-compilation is always possible
+
+env GOOS=windwos
+
+! go build -n exclude
+stderr 'unsupported GOOS/GOARCH pair'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/build_vendor.txt b/src/cmd/go/testdata/script/build_vendor.txt
new file mode 100644
index 0000000..f430ff2
--- /dev/null
+++ b/src/cmd/go/testdata/script/build_vendor.txt
@@ -0,0 +1,42 @@
+# Build
+env GO111MODULE=off
+go build vend/x
+! stdout .
+! stderr .
+
+-- vend/dir1/dir1.go --
+package dir1
+-- vend/subdir/bad.go --
+package subdir
+
+import _ "r"
+-- vend/subdir/good.go --
+package subdir
+
+import _ "p"
+-- vend/vendor/p/p.go --
+package p
+-- vend/vendor/q/q.go --
+package q
+-- vend/vendor/vend/dir1/dir2/dir2.go --
+package dir2
+-- vend/x/invalid/invalid.go --
+package invalid
+
+import "vend/x/invalid/vendor/foo"
+-- vend/x/vendor/p/p/p.go --
+package p
+
+import _ "notfound"
+-- vend/x/vendor/p/p.go --
+package p
+-- vend/x/vendor/r/r.go --
+package r
+-- vend/x/x.go --
+package x
+
+import _ "p"
+import _ "q"
+import _ "r"
+import _ "vend/dir1"      // not vendored
+import _ "vend/dir1/dir2" // vendored
diff --git a/src/cmd/go/testdata/script/cache_unix.txt b/src/cmd/go/testdata/script/cache_unix.txt
new file mode 100644
index 0000000..0e07ba6
--- /dev/null
+++ b/src/cmd/go/testdata/script/cache_unix.txt
@@ -0,0 +1,36 @@
+env GO111MODULE=off
+
+# Integration test for cache directory calculation (cmd/go/internal/cache).
+
+[windows] skip
+[darwin] skip
+[plan9] skip
+
+mkdir $WORK/gocache
+mkdir $WORK/xdg
+mkdir $WORK/home
+
+# Set GOCACHE, XDG_CACHE_HOME, and HOME.
+env GOCACHE=$WORK/gocache
+env XDG_CACHE_HOME=$WORK/xdg
+env HOME=$WORK/home
+
+# With all three set, we should prefer GOCACHE.
+go env GOCACHE
+stdout '\$WORK/gocache$'
+
+# Without GOCACHE, we should prefer XDG_CACHE_HOME over HOME.
+env GOCACHE=
+go env GOCACHE
+stdout '\$WORK/xdg/go-build$$'
+
+# With only HOME set, we should use $HOME/.cache.
+env XDG_CACHE_HOME=
+go env GOCACHE
+stdout '\$WORK/home/.cache/go-build$'
+
+# With no guidance from the environment, we must disable the cache, but that
+# should not cause commands that do not write to the cache to fail.
+env HOME=
+go env GOCACHE
+stdout 'off'
diff --git a/src/cmd/go/testdata/script/cache_vet.txt b/src/cmd/go/testdata/script/cache_vet.txt
new file mode 100644
index 0000000..928024e
--- /dev/null
+++ b/src/cmd/go/testdata/script/cache_vet.txt
@@ -0,0 +1,22 @@
+env GO111MODULE=off
+
+[short] skip
+[GODEBUG:gocacheverify=1] skip
+[gccgo] skip  # gccgo has no standard packages
+
+# Start with a clean build cache:
+# test failures may be masked if the cache has just the right entries already.
+env GOCACHE=$WORK/cache
+
+# Run 'go vet os/user' once to warm up the cache.
+go vet os/user
+
+# Check that second vet reuses cgo-derived inputs.
+# The first command could be build instead of vet,
+# except that if the cache is empty and there's a net.a
+# in GOROOT/pkg, the build will not bother to regenerate
+# and cache the cgo outputs, whereas vet always will.
+
+go vet -x os/user
+! stderr '^(clang|gcc)'  # should not have run compiler
+! stderr '[\\/]cgo '     # should not have run cgo
diff --git a/src/cmd/go/testdata/script/cgo_asm_error.txt b/src/cmd/go/testdata/script/cgo_asm_error.txt
new file mode 100644
index 0000000..7aaa713
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_asm_error.txt
@@ -0,0 +1,25 @@
+[!cgo] skip
+
+# Test that cgo package can't contain a go assembly file.
+
+# Ensure the build fails and reports that the package has a Go assembly file.
+! go build cgoasm
+stderr 'package using cgo has Go assembly file'
+
+-- go.mod --
+module cgoasm
+
+go 1.16
+-- p.go --
+package p
+
+/*
+// hi
+*/
+import "C"
+
+func F() {}
+-- p.s --
+TEXT asm(SB),$0
+	RET
+
diff --git a/src/cmd/go/testdata/script/cgo_bad_directives.txt b/src/cmd/go/testdata/script/cgo_bad_directives.txt
new file mode 100644
index 0000000..6bf3beb
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_bad_directives.txt
@@ -0,0 +1,129 @@
+[!cgo] skip
+[short] skip
+
+cp x.go.txt x.go
+
+# Only allow //go:cgo_ldflag .* in cgo-generated code
+[gc] cp x_gc.go.txt x.go
+[gc] ! go build x
+[gc] stderr '//go:cgo_ldflag .* only allowed in cgo-generated code'
+
+# Ignore _* files
+rm x.go
+! go build .
+stderr 'no Go files'
+cp cgo_yy.go.txt _cgo_yy.go
+! go build .
+stderr 'no Go files' #_* files are ignored...
+
+[gc] ! go build _cgo_yy.go # ... but if forced, the comment is rejected
+# Actually, today there is a separate issue that _ files named
+# on the command line are ignored. Once that is fixed,
+# we want to see the cgo_ldflag error.
+[gc] stderr '//go:cgo_ldflag only allowed in cgo-generated code|no Go files'
+
+rm _cgo_yy.go
+
+# Reject #cgo CFLAGS: -fplugin=foo.so
+cp x.go.txt x.go
+cp y_fplugin.go.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: -fplugin=foo.so'
+
+# Reject #cgo CFLAGS: -lbar -fplugin=foo.so
+cp y_lbar_fplugin.go.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: -fplugin=foo.so'
+
+# Reject #cgo pkg-config: -foo
+cp y_pkgconfig_dash_foo.txt y.go
+! go build x
+stderr 'invalid pkg-config package name: -foo'
+
+# Reject #cgo pkg-config: @foo
+cp y_pkgconfig_at_foo.txt y.go
+! go build x
+stderr 'invalid pkg-config package name: @foo'
+
+# Reject #cgo CFLAGS: @foo
+cp y_cflags_at_foo.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: @foo'
+
+# Reject #cgo CFLAGS: -D
+cp y_cflags_dash_d.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: -D without argument'
+
+# Note that -I @foo is allowed because we rewrite it into -I /path/to/src/@foo
+# before the check is applied. There's no such rewrite for -D.
+
+# Reject #cgo CFLAGS: -D @foo
+cp y_cflags_dash_d_space_at_foo.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: -D @foo'
+
+# Reject #cgo CFLAGS -D@foo
+cp y_cflags_dash_d_at_foo.txt y.go
+! go build x
+stderr 'invalid flag in #cgo CFLAGS: -D@foo'
+
+# Check for CFLAGS in commands
+env CGO_CFLAGS=-D@foo
+cp y_no_cflags.txt y.go
+go build -n x
+stderr '-D@foo'
+
+-- go.mod --
+module x
+
+go 1.16
+-- x_gc.go.txt --
+package x
+
+//go:cgo_ldflag "-fplugin=foo.so"
+
+import "C"
+-- cgo_yy.go.txt --
+package x
+
+//go:cgo_ldflag "-fplugin=foo.so"
+
+import "C"
+-- x.go.txt --
+package x
+-- y_fplugin.go.txt --
+package x
+// #cgo CFLAGS: -fplugin=foo.so
+import "C"
+-- y_lbar_fplugin.go.txt --
+package x
+// #cgo CFLAGS: -Ibar -fplugin=foo.so
+import "C"
+-- y_pkgconfig_dash_foo.txt --
+package x
+// #cgo pkg-config: -foo
+import "C"
+-- y_pkgconfig_at_foo.txt --
+package x
+// #cgo pkg-config: @foo
+import "C"
+-- y_cflags_at_foo.txt --
+package x
+// #cgo CFLAGS: @foo
+import "C"
+-- y_cflags_dash_d.txt --
+package x
+// #cgo CFLAGS: -D
+import "C"
+-- y_cflags_dash_d_space_at_foo.txt --
+package x
+// #cgo CFLAGS: -D @foo
+import "C"
+-- y_cflags_dash_d_at_foo.txt --
+package x
+// #cgo CFLAGS: -D@foo
+import "C"
+-- y_no_cflags.txt --
+package x
+import "C"
diff --git a/src/cmd/go/testdata/script/cgo_depends_on_syscall.txt b/src/cmd/go/testdata/script/cgo_depends_on_syscall.txt
new file mode 100644
index 0000000..bd4777c
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_depends_on_syscall.txt
@@ -0,0 +1,15 @@
+[!cgo] skip
+[!race] skip
+
+go list -race -deps foo
+stdout syscall
+
+-- go.mod --
+module foo
+
+go 1.16
+-- foo.go --
+package foo
+
+// #include <stdio.h>
+import "C"
diff --git a/src/cmd/go/testdata/script/cgo_flag_contains_space.txt b/src/cmd/go/testdata/script/cgo_flag_contains_space.txt
new file mode 100644
index 0000000..a3372bb
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_flag_contains_space.txt
@@ -0,0 +1,16 @@
+[short] skip
+[!cgo] skip
+
+env GOCACHE=$WORK/gocache  # Looking for compile flags, so need a clean cache.
+go build -x -n main.go
+stderr '"-I[^"]+c flags"' # find quoted c flags
+! stderr '"-I[^"]+c flags".*"-I[^"]+c flags"' # don't find too many quoted c flags per line
+stderr '"-L[^"]+ld flags"' # find quoted ld flags
+! stderr '"-L[^"]+c flags".*"-L[^"]+c flags"' # don't find too many quoted ld flags per line
+
+-- main.go --
+package main
+// #cgo CFLAGS: -I"c flags"
+// #cgo LDFLAGS: -L"ld flags"
+import "C"
+func main() {}
diff --git a/src/cmd/go/testdata/script/cgo_path.txt b/src/cmd/go/testdata/script/cgo_path.txt
new file mode 100644
index 0000000..be9609e
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_path.txt
@@ -0,0 +1,43 @@
+[!cgo] skip
+
+# Set CC explicitly to something that requires a PATH lookup.
+# Normally, the default is gcc or clang, but if CC was set during make.bash,
+# that becomes the default.
+[exec:clang] env CC=clang
+[exec:gcc] env CC=gcc
+[!exec:clang] [!exec:gcc] skip 'Unknown C compiler'
+
+env GOCACHE=$WORK/gocache  # Looking for compile flags, so need a clean cache.
+[!windows] env PATH=.:$PATH
+[!windows] chmod 0755 p/gcc p/clang
+[!windows] exists -exec p/gcc p/clang
+[windows] exists -exec p/gcc.bat p/clang.bat
+! exists p/bug.txt
+! go build -x
+stderr '^cgo: exec (clang|gcc): (clang|gcc) resolves to executable relative to current directory \(.[/\\](clang|gcc)(.bat)?\)$'
+! exists p/bug.txt
+
+-- go.mod --
+module m
+
+-- m.go --
+package m
+
+import _ "m/p"
+
+-- p/p.go --
+package p
+
+// #define X 1
+import "C"
+
+-- p/gcc --
+#!/bin/sh
+echo ran gcc >bug.txt
+-- p/clang --
+#!/bin/sh
+echo ran clang >bug.txt
+-- p/gcc.bat --
+echo ran gcc >bug.txt
+-- p/clang.bat --
+echo ran clang >bug.txt
diff --git a/src/cmd/go/testdata/script/cgo_path_space.txt b/src/cmd/go/testdata/script/cgo_path_space.txt
new file mode 100644
index 0000000..654295d
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_path_space.txt
@@ -0,0 +1,56 @@
+# Check that if the PATH directory containing the C compiler has a space,
+# we can still use that compiler with cgo.
+# Verifies #43808.
+[!cgo] skip
+
+# Set CC explicitly to something that requires a PATH lookup.
+# Normally, the default is gcc or clang, but if CC was set during make.bash,
+# that becomes the default.
+[exec:clang] env CC=clang
+[exec:gcc] env CC=gcc
+[!exec:clang] [!exec:gcc] skip 'Unknown C compiler'
+
+[!windows] chmod 0755 $WORK/'program files'/clang
+[!windows] chmod 0755 $WORK/'program files'/gcc
+[!windows] exists -exec $WORK/'program files'/clang
+[!windows] exists -exec $WORK/'program files'/gcc
+[!windows] env PATH=$WORK/'program files':$PATH
+[windows] exists -exec $WORK/'program files'/gcc.bat
+[windows] exists -exec $WORK/'program files'/clang.bat
+[windows] env PATH=$WORK\'program files';%PATH%
+
+! exists $WORK/log.txt
+? go build -x
+exists $WORK/log.txt
+rm $WORK/log.txt
+
+# TODO(#41400, #43078): when CC is set explicitly, it should be allowed to
+# contain spaces separating arguments, and it should be possible to quote
+# arguments with spaces (including the path), as in CGO_CFLAGS and other
+# variables. For now, this doesn't work.
+[!windows] env CC=$WORK/'program files'/gcc
+[windows] env CC=$WORK\'program files'\gcc.bat
+! go build -x
+! exists $WORK/log.txt
+
+-- go.mod --
+module m
+
+-- m.go --
+package m
+
+// #define X 1
+import "C"
+
+-- $WORK/program files/gcc --
+#!/bin/sh
+
+echo ok >$WORK/log.txt
+-- $WORK/program files/clang --
+#!/bin/sh
+
+echo ok >$WORK/log.txt
+-- $WORK/program files/gcc.bat --
+echo ok >%WORK%\log.txt
+-- $WORK/program files/clang.bat --
+echo ok >%WORK%\log.txt
diff --git a/src/cmd/go/testdata/script/cgo_syso_issue29253.txt b/src/cmd/go/testdata/script/cgo_syso_issue29253.txt
new file mode 100644
index 0000000..4fb5cca
--- /dev/null
+++ b/src/cmd/go/testdata/script/cgo_syso_issue29253.txt
@@ -0,0 +1,31 @@
+env GO111MODULE=off
+[short] skip
+
+# This test tests that we can link in-package syso files that provides symbols
+# for cgo. See issue 29253.
+[!cgo] stop
+[!gc] stop
+cc -c -o pkg/o.syso ext.c
+go build main.go
+
+-- ext.c --
+// +build ignore
+
+int f() { return 42; }
+-- pkg/pkg.go --
+package pkg
+
+// extern int f(void);
+import "C"
+
+func init() {
+	if v := C.f(); v != 42 {
+		panic(v)
+	}
+}
+-- main.go --
+package main
+
+import _ "pkg"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/clean_binary.txt b/src/cmd/go/testdata/script/clean_binary.txt
new file mode 100644
index 0000000..7335f8a
--- /dev/null
+++ b/src/cmd/go/testdata/script/clean_binary.txt
@@ -0,0 +1,78 @@
+# Build something to create the executable, including several cases
+[short] skip
+
+# --------------------- clean executables -------------------------
+
+# case1: test file-named executable 'main'
+env GO111MODULE=on
+
+! exists main$GOEXE
+go build main.go
+exists -exec main$GOEXE
+go clean
+! exists main$GOEXE
+
+# case2: test module-named executable 'a.b.c'
+! exists a.b.c$GOEXE
+go build
+exists -exec a.b.c$GOEXE
+go clean
+! exists a.b.c$GOEXE
+
+# case3: directory-named executable 'src'
+env GO111MODULE=off
+
+! exists src$GOEXE
+go build
+exists -exec src$GOEXE
+go clean
+! exists src$GOEXE
+
+# --------------------- clean test files -------------------------
+
+# case1: test file-named test file
+env GO111MODULE=on
+
+! exists main.test$GOEXE
+go test -c main_test.go
+exists -exec main.test$GOEXE
+go clean
+! exists main.test$GOEXE
+
+# case2: test module-named test file
+! exists a.b.c.test$GOEXE
+go test -c
+exists -exec a.b.c.test$GOEXE
+go clean
+! exists a.b.c.test$GOEXE
+
+# case3: test directory-based test file
+env GO111MODULE=off
+
+! exists src.test$GOEXE
+go test -c
+exists -exec src.test$GOEXE
+go clean
+! exists src.test$GOEXE
+
+-- main.go --
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello!")
+}
+
+-- main_test.go --
+package main
+
+import "testing"
+
+func TestSomething(t *testing.T) {
+}
+
+-- go.mod --
+module example.com/a.b.c/v2
+
+go 1.12
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/clean_cache_n.txt b/src/cmd/go/testdata/script/clean_cache_n.txt
new file mode 100644
index 0000000..4497b36
--- /dev/null
+++ b/src/cmd/go/testdata/script/clean_cache_n.txt
@@ -0,0 +1,25 @@
+# We're testing cache behavior, so start with a clean GOCACHE.
+env GOCACHE=$WORK/cache
+
+# Build something so that the cache gets populates
+go build main.go
+
+# Check that cache contains directories before running
+exists $GOCACHE/00
+
+# Run go clean -cache -n and ensure that directories weren't deleted
+go clean -cache -n
+exists $GOCACHE/00
+
+# Re-run go clean cache without the -n flag go ensure that directories were properly removed
+go clean -cache
+! exists $GOCACHE/00
+
+-- main.go --
+package main
+
+import "fmt"
+
+func main() {
+	fmt.Println("hello!")
+}
diff --git a/src/cmd/go/testdata/script/clean_testcache.txt b/src/cmd/go/testdata/script/clean_testcache.txt
new file mode 100644
index 0000000..b3f32fe
--- /dev/null
+++ b/src/cmd/go/testdata/script/clean_testcache.txt
@@ -0,0 +1,26 @@
+env GO111MODULE=off
+[short] skip
+
+# go clean -testcache
+# should work (see golang.org/issue/29757).
+cd x
+go test x_test.go
+go clean -testcache
+go test x_test.go
+! stdout 'cached'
+
+# golang.org/issue/29100: 'go clean -testcache' should succeed
+# if the cache directory doesn't exist at all.
+# It should not write a testexpire.txt file, since there are no
+# test results that need to be invalidated in the first place.
+env GOCACHE=$WORK/nonexistent
+go clean -testcache
+! exists $WORK/nonexistent
+
+-- x/x_test.go --
+package x_test
+import (
+    "testing"
+)
+func TestMain(t *testing.T) {
+}
diff --git a/src/cmd/go/testdata/script/cmd_import_error.txt b/src/cmd/go/testdata/script/cmd_import_error.txt
new file mode 100644
index 0000000..dea76f4
--- /dev/null
+++ b/src/cmd/go/testdata/script/cmd_import_error.txt
@@ -0,0 +1,16 @@
+env GO111MODULE=on
+
+# Regression test for golang.org/issue/31031:
+# Importing or loading a non-existent package in cmd/ should print
+# a clear error in module mode.
+
+! go list cmd/unknown
+stderr '^package cmd/unknown is not in GOROOT \('$GOROOT'[/\\]src[/\\]cmd[/\\]unknown\)$'
+
+go list -f '{{range .DepsErrors}}{{.Err}}{{end}}' x.go
+stdout '^package cmd/unknown is not in GOROOT \('$GOROOT'[/\\]src[/\\]cmd[/\\]unknown\)$'
+
+-- x.go --
+package x
+
+import _ "cmd/unknown"
diff --git a/src/cmd/go/testdata/script/cover_asm.txt b/src/cmd/go/testdata/script/cover_asm.txt
new file mode 100644
index 0000000..57f76d6
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_asm.txt
@@ -0,0 +1,33 @@
+[short] skip
+[gccgo] skip # gccgo has no cover tool
+
+# Test cover for a package that has an assembly function.
+
+go test -outputdir=$WORK -coverprofile=cover.out coverasm
+go tool cover -func=$WORK/cover.out
+stdout '\tg\t*100.0%' # Check g is 100% covered.
+! stdout '\tf\t*[0-9]' # Check for no coverage on the assembly function
+
+-- go.mod --
+module coverasm
+
+go 1.16
+-- p.go --
+package p
+
+func f()
+
+func g() {
+	println("g")
+}
+-- p.s --
+// empty asm file,
+// so go test doesn't complain about declaration of f in p.go.
+-- p_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {
+	g()
+}
diff --git a/src/cmd/go/testdata/script/cover_atomic_pkgall.txt b/src/cmd/go/testdata/script/cover_atomic_pkgall.txt
new file mode 100644
index 0000000..c3bc67d
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_atomic_pkgall.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+
+[short] skip
+
+go test -coverpkg=all -covermode=atomic x
+stdout ok[\s\S]+?coverage
+
+[!race] stop
+
+go test -coverpkg=all -race x
+stdout ok[\s\S]+?coverage
+
+-- x/x.go --
+package x
+
+import _ "sync/atomic"
+
+func F() {}
+
+-- x/x_test.go --
+package x
+
+import "testing"
+
+func TestF(t *testing.T) { F() }
diff --git a/src/cmd/go/testdata/script/cover_blank_func_decl.txt b/src/cmd/go/testdata/script/cover_blank_func_decl.txt
new file mode 100644
index 0000000..e7d5250
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_blank_func_decl.txt
@@ -0,0 +1,35 @@
+[short] skip
+go test -cover coverblank
+stdout 'coverage: 100.0% of statements'
+
+
+-- go.mod --
+module coverblank
+
+go 1.16
+-- a.go --
+package coverblank
+
+func _() {
+	println("unreachable")
+}
+
+type X int
+
+func (x X) Print() {
+	println(x)
+}
+
+func (x X) _() {
+	println("unreachable")
+}
+
+-- a_test.go --
+package coverblank
+
+import "testing"
+
+func TestX(t *testing.T) {
+	var x X
+	x.Print()
+}
diff --git a/src/cmd/go/testdata/script/cover_cgo.txt b/src/cmd/go/testdata/script/cover_cgo.txt
new file mode 100644
index 0000000..9cf78f7
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_cgo.txt
@@ -0,0 +1,42 @@
+[short] skip
+[!cgo] skip
+[gccgo] skip # gccgo has no cover tool
+
+# Test coverage on cgo code.
+
+go test -short -cover cgocover
+stdout  'coverage:.*[1-9][0-9.]+%'
+! stderr '[^0-9]0\.0%'
+
+-- go.mod --
+module cgocover
+
+go 1.16
+-- p.go --
+package p
+
+/*
+void
+f(void)
+{
+}
+*/
+import "C"
+
+var b bool
+
+func F() {
+	if b {
+		for {
+		}
+	}
+	C.f()
+}
+-- p_test.go --
+package p
+
+import "testing"
+
+func TestF(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cover_cgo_extra_file.txt b/src/cmd/go/testdata/script/cover_cgo_extra_file.txt
new file mode 100644
index 0000000..c53b979
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_cgo_extra_file.txt
@@ -0,0 +1,48 @@
+[short] skip
+[!cgo] skip
+[gccgo] skip # gccgo has no cover tool
+
+# Test coverage on cgo code. This test case includes an
+# extra empty non-cgo file in the package being checked.
+
+go test -short -cover cgocover4
+stdout  'coverage:.*[1-9][0-9.]+%'
+! stderr '[^0-9]0\.0%'
+
+-- go.mod --
+module cgocover4
+
+go 1.16
+-- notcgo.go --
+package p
+-- p.go --
+package p
+
+/*
+void
+f(void)
+{
+}
+*/
+import "C"
+
+var b bool
+
+func F() {
+	if b {
+		for {
+		}
+	}
+	C.f()
+}
+-- x_test.go --
+package p_test
+
+import (
+	. "cgocover4"
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cover_cgo_extra_test.txt b/src/cmd/go/testdata/script/cover_cgo_extra_test.txt
new file mode 100644
index 0000000..b501ab0
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_cgo_extra_test.txt
@@ -0,0 +1,49 @@
+[short] skip
+[!cgo] skip
+[gccgo] skip # gccgo has no cover tool
+
+# Test coverage on cgo code. This test case has an external
+# test that tests the code and an in-package test file with
+# no test cases.
+
+go test -short -cover cgocover3
+stdout  'coverage:.*[1-9][0-9.]+%'
+! stderr '[^0-9]0\.0%'
+
+-- go.mod --
+module cgocover3
+
+go 1.16
+-- p.go --
+package p
+
+/*
+void
+f(void)
+{
+}
+*/
+import "C"
+
+var b bool
+
+func F() {
+	if b {
+		for {
+		}
+	}
+	C.f()
+}
+-- p_test.go --
+package p
+-- x_test.go --
+package p_test
+
+import (
+	. "cgocover3"
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cover_cgo_xtest.txt b/src/cmd/go/testdata/script/cover_cgo_xtest.txt
new file mode 100644
index 0000000..79cc08c
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_cgo_xtest.txt
@@ -0,0 +1,45 @@
+[short] skip
+[!cgo] skip
+[gccgo] skip # gccgo has no cover tool
+
+# Test cgo coverage with an external test.
+
+go test -short -cover cgocover2
+stdout  'coverage:.*[1-9][0-9.]+%'
+! stderr '[^0-9]0\.0%'
+
+-- go.mod --
+module cgocover2
+
+go 1.16
+-- p.go --
+package p
+
+/*
+void
+f(void)
+{
+}
+*/
+import "C"
+
+var b bool
+
+func F() {
+	if b {
+		for {
+		}
+	}
+	C.f()
+}
+-- x_test.go --
+package p_test
+
+import (
+	. "cgocover2"
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cover_dash_c.txt b/src/cmd/go/testdata/script/cover_dash_c.txt
new file mode 100644
index 0000000..8950f8d
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_dash_c.txt
@@ -0,0 +1,31 @@
+[short] skip
+[gccgo] skip
+
+# Test for issue 24588
+
+go test -c -o $WORK/coverdep -coverprofile=$WORK/no/such/dir/cover.out coverdep
+exists -exec $WORK/coverdep
+
+-- go.mod --
+module coverdep
+
+go 1.16
+-- p.go --
+package p
+
+import _ "coverdep/p1"
+
+func F() {
+}
+-- p1/p1.go --
+package p1
+
+import _ "errors"
+-- p_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cover_dep_loop.txt b/src/cmd/go/testdata/script/cover_dep_loop.txt
new file mode 100644
index 0000000..36ea6e0
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_dep_loop.txt
@@ -0,0 +1,36 @@
+[short] skip
+[gccgo] skip
+
+# coverdep2/p1's xtest imports coverdep2/p2 which imports coverdep2/p1.
+# Make sure that coverage on coverdep2/p2 recompiles coverdep2/p2.
+
+go test -short -cover coverdep2/p1
+stdout 'coverage: 100.0% of statements' # expect 100.0% coverage
+
+-- go.mod --
+module coverdep2
+
+go 1.16
+-- p1/p.go --
+package p1
+
+func F() int { return 1 }
+-- p1/p_test.go --
+package p1_test
+
+import (
+	"coverdep2/p2"
+	"testing"
+)
+
+func Test(t *testing.T) {
+	p2.F()
+}
+-- p2/p2.go --
+package p2
+
+import "coverdep2/p1"
+
+func F() {
+	p1.F()
+}
diff --git a/src/cmd/go/testdata/script/cover_dot_import.txt b/src/cmd/go/testdata/script/cover_dot_import.txt
new file mode 100644
index 0000000..d492e42
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_dot_import.txt
@@ -0,0 +1,29 @@
+[short] skip
+[gccgo] skip # gccgo has no cover tool
+
+go test -coverpkg=coverdot/a,coverdot/b coverdot/b
+! stderr '[^0-9]0\.0%'
+! stdout '[^0-9]0\.0%'
+
+-- go.mod --
+module coverdot
+
+go 1.16
+-- a/a.go --
+package a
+
+func F() {}
+-- b/b.go --
+package b
+
+import . "coverdot/a"
+
+func G() { F() }
+-- b/b_test.go --
+package b
+
+import "testing"
+
+func TestG(t *testing.T) {
+	G()
+}
diff --git a/src/cmd/go/testdata/script/cover_error.txt b/src/cmd/go/testdata/script/cover_error.txt
new file mode 100644
index 0000000..583a664
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_error.txt
@@ -0,0 +1,74 @@
+[short] skip
+[gccgo] skip
+
+# Test line numbers in cover errors.
+
+# Get errors from a go test into stderr.txt
+! go test coverbad
+stderr 'p\.go:4' # look for error at coverbad/p.go:4
+[cgo] stderr 'p1\.go:6' # look for error at coverbad/p.go:6
+! stderr $WORK # make sure temporary directory isn't in error
+
+cp stderr $WORK/stderr.txt
+
+# Clean out character positions from stderr.txt
+# It's OK that stderr2 drops the character position in the error,
+# because of the //line directive (see golang.org/issue/22662).
+go run clean_charpos.go $WORK/stderr.txt &
+
+# Get errors from coverage into stderr2.txt
+! go test -cover coverbad
+cp stderr $WORK/stderr2.txt
+
+wait # for go run above
+
+cmp $WORK/stderr.txt $WORK/stderr2.txt
+
+-- go.mod --
+module coverbad
+
+go 1.16
+-- p.go --
+package p
+
+func f() {
+	g()
+}
+-- p1.go --
+package p
+
+import "C"
+
+func h() {
+	j()
+}
+-- p_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {}
+-- clean_charpos.go --
+// +build ignore
+
+package main
+
+import (
+	"log"
+	"os"
+	"strings"
+)
+
+func main() {
+	log.SetFlags(0)
+	b, err := os.ReadFile(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	s := strings.ReplaceAll(string(b), "p.go:4:2:", "p.go:4:")
+	s = strings.ReplaceAll(s, "p1.go:6:2:", "p1.go:6:")
+	os.WriteFile(os.Args[1], []byte(s), 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/src/cmd/go/testdata/script/cover_import_main_loop.txt b/src/cmd/go/testdata/script/cover_import_main_loop.txt
new file mode 100644
index 0000000..eb6de67
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_import_main_loop.txt
@@ -0,0 +1,26 @@
+[gccgo] skip # gccgo has no cover tool
+
+! go test -n importmain/test
+stderr 'not an importable package' # check that import main was detected
+! go test -n -cover importmain/test
+stderr 'not an importable package' # check that import main was detected
+
+-- go.mod --
+module importmain
+
+go 1.16
+-- ismain/main.go --
+package main
+
+import _ "importmain/test"
+
+func main() {}
+-- test/test.go --
+package test
+-- test/test_test.go --
+package test_test
+
+import "testing"
+import _ "importmain/ismain"
+
+func TestCase(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/cover_mod_empty.txt b/src/cmd/go/testdata/script/cover_mod_empty.txt
new file mode 100644
index 0000000..3c45243
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_mod_empty.txt
@@ -0,0 +1,9 @@
+go tool cover -func=cover.out
+stdout total.*statements.*0.0%
+
+go mod init golang.org/issue/33855
+
+go tool cover -func=cover.out
+stdout total.*statements.*0.0%
+
+-- cover.out --
diff --git a/src/cmd/go/testdata/script/cover_modes.txt b/src/cmd/go/testdata/script/cover_modes.txt
new file mode 100644
index 0000000..f8a399d
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_modes.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+
+# Coverage analysis should use 'set' mode by default,
+# and should merge coverage profiles correctly.
+
+[short] skip
+[gccgo] skip # gccgo has no cover tool
+
+go test -short -cover encoding/binary errors -coverprofile=$WORK/cover.out
+! stderr '[^0-9]0\.0%'
+! stdout '[^0-9]0\.0%'
+
+grep -count=1 '^mode: set$' $WORK/cover.out
+grep 'errors\.go' $WORK/cover.out
+grep 'binary\.go' $WORK/cover.out
+
+[!race] stop
+
+go test -short -race -cover encoding/binary errors -coverprofile=$WORK/cover.out
+! stderr '[^0-9]0\.0%'
+! stdout '[^0-9]0\.0%'
+
+grep -count=1 '^mode: atomic$' $WORK/cover.out
+grep 'errors\.go' $WORK/cover.out
+grep 'binary\.go' $WORK/cover.out
diff --git a/src/cmd/go/testdata/script/cover_pattern.txt b/src/cmd/go/testdata/script/cover_pattern.txt
new file mode 100644
index 0000000..ec0850c
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_pattern.txt
@@ -0,0 +1,41 @@
+[gccgo] skip
+
+# If coverpkg=m/sleepy... expands by package loading
+# (as opposed to pattern matching on deps)
+# then it will try to load sleepybad, which does not compile,
+# and the test command will fail.
+! go list m/sleepy...
+go test -c -n -coverprofile=$TMPDIR/cover.out -coverpkg=m/sleepy... -run=^$ m/sleepy1
+
+-- go.mod --
+module m
+
+go 1.16
+-- sleepy1/p_test.go --
+package p
+
+import (
+	"testing"
+	"time"
+)
+
+func Test1(t *testing.T) {
+	time.Sleep(200 * time.Millisecond)
+}
+-- sleepy2/p_test.go --
+package p
+
+import (
+	"testing"
+	"time"
+)
+
+func Test1(t *testing.T) {
+	time.Sleep(200 * time.Millisecond)
+}
+-- sleepybad/p.go --
+package p
+
+import ^
+
+var _ = io.DoesNotExist
diff --git a/src/cmd/go/testdata/script/cover_pkgall_multiple_mains.txt b/src/cmd/go/testdata/script/cover_pkgall_multiple_mains.txt
new file mode 100644
index 0000000..f21cd8b
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_pkgall_multiple_mains.txt
@@ -0,0 +1,46 @@
+# This test checks that multiple main packages can be tested
+# with -coverpkg=all without duplicate symbol errors.
+# Verifies golang.org/issue/30374, golang.org/issue/34114.
+
+[short] skip
+cd $GOPATH/src/example.com/cov
+
+env GO111MODULE=on
+go test -coverpkg=all ./...
+
+env GO111MODULE=off
+go test -coverpkg=all ./...
+
+-- $GOPATH/src/example.com/cov/go.mod --
+module example.com/cov
+
+-- $GOPATH/src/example.com/cov/mainonly/mainonly.go --
+package main
+
+func main() {}
+
+-- $GOPATH/src/example.com/cov/mainwithtest/mainwithtest.go --
+package main
+
+func main() {}
+
+func Foo() {}
+
+-- $GOPATH/src/example.com/cov/mainwithtest/mainwithtest_test.go --
+package main
+
+import "testing"
+
+func TestFoo(t *testing.T) {
+  Foo()
+}
+
+-- $GOPATH/src/example.com/cov/xtest/x.go --
+package x
+
+-- $GOPATH/src/example.com/cov/xtest/x_test.go --
+package x_test
+
+import "testing"
+
+func TestX(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/cover_pkgall_runtime.txt b/src/cmd/go/testdata/script/cover_pkgall_runtime.txt
new file mode 100644
index 0000000..9927c30
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_pkgall_runtime.txt
@@ -0,0 +1,23 @@
+env GO111MODULE=off
+
+# Issue 23882
+
+[short] skip
+
+go test -coverpkg=all x
+stdout ok[\s\S]+?coverage
+
+[!race] stop
+
+go test -coverpkg=all -race x
+stdout ok[\s\S]+?coverage
+
+-- x/x.go --
+package x
+import _ "runtime"
+func F() {}
+
+-- x/x_test.go --
+package x
+import "testing"
+func TestF(t *testing.T) { F() }
diff --git a/src/cmd/go/testdata/script/cover_runs.txt b/src/cmd/go/testdata/script/cover_runs.txt
new file mode 100644
index 0000000..38a7bb7
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_runs.txt
@@ -0,0 +1,13 @@
+[gccgo] skip 'gccgo has no cover tool'
+[short] skip
+
+go test -short -coverpkg=strings strings regexp
+! stdout '[^0-9]0\.0%'
+stdout  'strings.*coverage:.*[1-9][0-9.]+%'
+stdout  'regexp.*coverage:.*[1-9][0-9.]+%'
+
+go test -short -cover strings math regexp
+! stdout '[^0-9]0\.0%'
+stdout  'strings.*coverage:.*[1-9][0-9.]+%'
+stdout  'math.*coverage:.*[1-9][0-9.]+%'
+stdout  'regexp.*coverage:.*[1-9][0-9.]+%'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/cover_statements.txt b/src/cmd/go/testdata/script/cover_statements.txt
new file mode 100644
index 0000000..4f3c9ca
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_statements.txt
@@ -0,0 +1,61 @@
+[short] skip
+go test -cover ./pkg1 ./pkg2 ./pkg3 ./pkg4
+stdout 'pkg1	\[no test files\]'
+stdout 'pkg2	\S+	coverage: 0.0% of statements \[no tests to run\]'
+stdout 'pkg3	\S+	coverage: 100.0% of statements'
+stdout 'pkg4	\S+	coverage: \[no statements\]'
+
+-- go.mod --
+module m
+
+go 1.16
+-- pkg1/a.go --
+package pkg1
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg1")
+}
+-- pkg2/a.go --
+package pkg2
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg2")
+}
+-- pkg2/a_test.go --
+package pkg2
+-- pkg3/a.go --
+package pkg3
+
+import "fmt"
+
+func F() {
+	fmt.Println("pkg3")
+}
+-- pkg3/a_test.go --
+package pkg3
+
+import "testing"
+
+func TestF(t *testing.T) {
+	F()
+}
+-- pkg4/a.go --
+package pkg4
+
+type T struct {
+	X bool
+}
+-- pkg4/a_test.go --
+package pkg4
+
+import (
+	"testing"
+)
+
+func TestT(t *testing.T) {
+	_ = T{}
+}
diff --git a/src/cmd/go/testdata/script/cover_sync_atomic_import.txt b/src/cmd/go/testdata/script/cover_sync_atomic_import.txt
new file mode 100644
index 0000000..433af9a
--- /dev/null
+++ b/src/cmd/go/testdata/script/cover_sync_atomic_import.txt
@@ -0,0 +1,28 @@
+[short] skip
+[gccgo] skip # gccgo has no cover tool
+
+go test -short -cover -covermode=atomic -coverpkg=coverdep/p1 coverdep
+
+-- go.mod --
+module coverdep
+
+go 1.16
+-- p.go --
+package p
+
+import _ "coverdep/p1"
+
+func F() {
+}
+-- p1/p1.go --
+package p1
+
+import _ "errors"
+-- p_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/cpu_profile_twice.txt b/src/cmd/go/testdata/script/cpu_profile_twice.txt
new file mode 100644
index 0000000..38d6439
--- /dev/null
+++ b/src/cmd/go/testdata/script/cpu_profile_twice.txt
@@ -0,0 +1,22 @@
+env GO111MODULE=off
+
+# Issue 23150
+
+[short] skip
+
+go test -o=$WORK/x.test -cpuprofile=$WORK/cpu_profile_twice.out x
+rm $WORK/cpu_profile_twice.out
+
+go test -o=$WORK/x.test -cpuprofile=$WORK/cpu_profile_twice.out x
+exists $WORK/cpu_profile_twice.out
+
+
+-- x/x_test.go --
+package x_test
+import (
+    "testing"
+    "time"
+)
+func TestSleep(t *testing.T) {
+    time.Sleep(10 * time.Millisecond)
+}
diff --git a/src/cmd/go/testdata/script/devnull.txt b/src/cmd/go/testdata/script/devnull.txt
new file mode 100644
index 0000000..ccb866a
--- /dev/null
+++ b/src/cmd/go/testdata/script/devnull.txt
@@ -0,0 +1,26 @@
+env GO111MODULE=off
+
+# Issue 28035: go test -c -o NUL should work.
+# Issue 28549: go test -c -o /dev/null should not overwrite /dev/null when run as root.
+cd x
+cmp $devnull $WORK/empty.txt
+go test -o=$devnull -c
+! exists x.test$GOEXE
+cmp $devnull $WORK/empty.txt
+
+# Issue 12407: go build -o /dev/null should succeed.
+cd ..
+go build -o $devnull y
+cmp $devnull $WORK/empty.txt
+
+-- x/x_test.go --
+package x_test
+import (
+    "testing"
+)
+func TestNUL(t *testing.T) {
+}
+-- y/y.go --
+package y
+func main() {}
+-- $WORK/empty.txt --
diff --git a/src/cmd/go/testdata/script/doc.txt b/src/cmd/go/testdata/script/doc.txt
new file mode 100644
index 0000000..3ff1aab
--- /dev/null
+++ b/src/cmd/go/testdata/script/doc.txt
@@ -0,0 +1,75 @@
+# go doc --help
+! go doc --help
+stderr 'go doc'
+stderr 'go doc <pkg>'
+stderr 'go doc <sym>\[\.<methodOrField>\]'
+stderr 'go doc \[<pkg>\.\]<sym>\[\.<methodOrField>\]'
+stderr 'go doc \[<pkg>\.\]\[<sym>\.\]<methodOrField>'
+stderr 'go doc <pkg> <sym>\[\.<methodOrField>\]'
+
+# go help doc
+go help doc
+stdout 'go doc'
+stdout 'go doc <pkg>'
+stdout 'go doc <sym>\[\.<methodOrField>\]'
+stdout 'go doc \[<pkg>\.\]<sym>\[\.<methodOrField>\]'
+stdout 'go doc \[<pkg>\.\]\[<sym>\.\]<methodOrField>'
+stdout 'go doc <pkg> <sym>\[\.<methodOrField>\]'
+
+# go doc <pkg>
+go doc p/v2
+stdout .
+
+# go doc <pkg> <sym>
+go doc p/v2 Symbol
+stdout .
+
+# go doc <pkg> <sym> <method>
+! go doc p/v2 Symbol Method
+stderr .
+
+# go doc <pkg>.<sym>
+go doc p/v2.Symbol
+stdout .
+
+# go doc <pkg>.<sym>.<method>
+go doc p/v2.Symbol.Method
+stdout .
+
+# go doc <sym>
+go doc Symbol
+stdout .
+
+# go doc <sym> <method>
+! go doc Symbol Method
+stderr .
+
+# go doc <sym>.<method>
+go doc Symbol.Method
+stdout .
+
+# go doc <pkg>.<method>
+go doc p/v2.Method
+stdout .
+
+# go doc <pkg> <method>
+go doc p/v2 Method
+stdout .
+
+# go doc <method>
+go doc Method
+stdout .
+
+-- go.mod --
+module p/v2
+
+go 1.13
+
+-- p.go --
+package p
+
+type Symbol struct{}
+
+func (Symbol) Method() error {
+	return nil
+}
diff --git a/src/cmd/go/testdata/script/embed.txt b/src/cmd/go/testdata/script/embed.txt
new file mode 100644
index 0000000..6ad42e9
--- /dev/null
+++ b/src/cmd/go/testdata/script/embed.txt
@@ -0,0 +1,109 @@
+# go list shows patterns and files
+go list -f '{{.EmbedPatterns}}'
+stdout '\[x\*t\*t\]'
+go list -f '{{.EmbedFiles}}'
+stdout '\[x.txt\]'
+go list -test -f '{{.TestEmbedPatterns}}'
+stdout '\[y\*t\*t\]'
+go list -test -f '{{.TestEmbedFiles}}'
+stdout '\[y.txt\]'
+go list -test -f '{{.XTestEmbedPatterns}}'
+stdout '\[z\*t\*t\]'
+go list -test -f '{{.XTestEmbedFiles}}'
+stdout '\[z.txt\]'
+
+# build embeds x.txt
+go build -x
+stderr 'x.txt'
+
+# build uses cache correctly
+go build -x
+! stderr 'x.txt'
+cp x.txt2 x.txt
+go build -x
+stderr 'x.txt'
+
+# build rejects invalid names
+cp x.go2 x.go
+go build -x
+cp x.txt .git
+! go build -x
+stderr '^x.go:5:12: pattern [*]t: cannot embed file [.]git: invalid name [.]git$'
+rm .git
+
+# build rejects symlinks
+[symlink] symlink x.tzt -> x.txt
+[symlink] ! go build -x
+[symlink] stderr 'pattern [*]t: cannot embed irregular file x.tzt'
+[symlink] rm x.tzt
+
+# build rejects empty directories
+mkdir t
+! go build -x
+stderr '^x.go:5:12: pattern [*]t: cannot embed directory t: contains no embeddable files$'
+
+# build ignores symlinks and invalid names in directories
+cp x.txt t/.git
+! go build -x
+stderr '^x.go:5:12: pattern [*]t: cannot embed directory t: contains no embeddable files$'
+go list -e -f '{{.Incomplete}}'
+stdout 'true'
+[symlink] symlink t/x.link -> ../x.txt
+[symlink] ! go build -x
+[symlink] stderr '^x.go:5:12: pattern [*]t: cannot embed directory t: contains no embeddable files$'
+
+cp x.txt t/x.txt
+go build -x
+
+# build reports errors with positions in imported packages
+rm t/x.txt
+! go build m/use
+stderr '^x.go:5:12: pattern [*]t: cannot embed directory t: contains no embeddable files$'
+
+-- x.go --
+package p
+
+import "embed"
+
+//go:embed x*t*t
+var X embed.FS
+
+-- x_test.go --
+package p
+
+import "embed"
+
+//go:embed y*t*t
+var Y string
+
+-- x_x_test.go --
+package p_test
+
+import "embed"
+
+//go:embed z*t*t
+var Z string
+
+-- x.go2 --
+package p
+
+import "embed"
+
+//go:embed *t
+var X embed.FS
+
+-- x.txt --
+hello
+
+-- y.txt --
+-- z.txt --
+-- x.txt2 --
+not hello
+
+-- use/use.go --
+package use
+
+import _ "m"
+-- go.mod --
+module m
+
diff --git a/src/cmd/go/testdata/script/embed_fmt.txt b/src/cmd/go/testdata/script/embed_fmt.txt
new file mode 100644
index 0000000..8a16afe
--- /dev/null
+++ b/src/cmd/go/testdata/script/embed_fmt.txt
@@ -0,0 +1,22 @@
+# go fmt ignores file not found
+go fmt xnofmt.go
+cmp xnofmt.go xfmt.ref
+! go build xnofmt.go
+stderr 'xnofmt.go:5:12: pattern missing.txt: no matching files found'
+
+-- xnofmt.go --
+package p
+
+import "embed"
+
+//go:embed missing.txt
+var X  embed.FS
+-- xfmt.ref --
+package p
+
+import "embed"
+
+//go:embed missing.txt
+var X embed.FS
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/env_write.txt b/src/cmd/go/testdata/script/env_write.txt
new file mode 100644
index 0000000..bda1e57
--- /dev/null
+++ b/src/cmd/go/testdata/script/env_write.txt
@@ -0,0 +1,175 @@
+env GO111MODULE=off
+
+# go env should default to the right places
+env AppData=$HOME/windowsappdata
+env home=$HOME/plan9home
+go env GOENV
+[aix] stdout $HOME/.config/go/env
+[darwin] stdout $HOME'/Library/Application Support/go/env'
+[freebsd] stdout $HOME/.config/go/env
+[linux] stdout $HOME/.config/go/env
+[netbsd] stdout $HOME/.config/go/env
+[openbsd] stdout $HOME/.config/go/env
+[plan9] stdout $HOME/plan9home/lib/go/env
+[windows] stdout $HOME\\windowsappdata\\go\\env
+
+# Now override it to something writable.
+env GOENV=$WORK/envdir/go/env
+go env GOENV
+stdout envdir[\\/]go[\\/]env
+
+# go env shows all variables
+go env
+stdout GOARCH=
+stdout GOOS=
+stdout GOROOT=
+
+# go env ignores invalid flag in GOFLAGS environment variable
+env GOFLAGS='=true'
+go env
+
+# checking errors
+! go env -w
+stderr 'go env -w: no KEY=VALUE arguments given'
+! go env -u
+stderr 'go env -u: no arguments given'
+
+# go env -w changes default setting
+env root=
+[windows] env root=c:
+env GOPATH=
+go env -w GOPATH=$root/non-exist/gopath
+! stderr .+
+grep GOPATH=$root/non-exist/gopath $WORK/envdir/go/env
+go env GOPATH
+stdout /non-exist/gopath
+
+# go env -w does not override OS environment, and warns about that
+env GOPATH=$root/other
+go env -w GOPATH=$root/non-exist/gopath2
+stderr 'warning: go env -w GOPATH=... does not override conflicting OS environment variable'
+go env GOPATH
+stdout $root/other
+
+# but go env -w does do the update, and unsetting the env var exposes the change
+env GOPATH=
+go env GOPATH
+stdout $root/non-exist/gopath2
+
+# unsetting with go env -u does not warn about OS environment overrides,
+# nor does it warn about variables that haven't been set by go env -w.
+env GOPATH=$root/other
+go env -u GOPATH
+! stderr .+
+go env -u GOPATH
+! stderr .+
+
+# go env -w rejects unknown or bad variables
+! go env -w GODEBUG=gctrace=1
+stderr 'unknown go command variable GODEBUG'
+! go env -w GOEXE=.bat
+stderr 'GOEXE cannot be modified'
+! go env -w GOVERSION=customversion
+stderr 'GOVERSION cannot be modified'
+! go env -w GOENV=/env
+stderr 'GOENV can only be set using the OS environment'
+
+# go env -w can set multiple variables
+env CC=
+go env CC
+! stdout ^xyc$
+go env -w GOOS=$GOOS CC=xyc
+grep CC=xyc $GOENV
+# file is maintained in sorted order
+grep 'CC=xyc\nGOOS=' $GOENV
+go env CC
+stdout ^xyc$
+
+# go env -u unsets effect of go env -w.
+go env -u CC
+go env CC
+! stdout ^xyc$
+
+# go env -w rejects double-set variables
+! go env -w GOOS=$GOOS GOOS=$GOOS
+stderr 'multiple values for key: GOOS'
+
+# go env -w rejects missing variables
+! go env -w GOOS
+stderr 'arguments must be KEY=VALUE: invalid argument: GOOS'
+
+# go env -w rejects invalid GO111MODULE values, as otherwise cmd/go would break
+! go env -w GO111MODULE=badvalue
+stderr 'invalid GO111MODULE value "badvalue"'
+
+# go env -w rejects invalid GOPATH values
+! go env -w GOPATH=~/go
+stderr 'GOPATH entry cannot start with shell metacharacter'
+
+! go env -w GOPATH=./go
+stderr 'GOPATH entry is relative; must be absolute path'
+
+# go env -w rejects invalid GOTMPDIR values
+! go env -w GOTMPDIR=x
+stderr 'go env -w: GOTMPDIR must be an absolute path'
+
+# go env -w should accept absolute GOTMPDIR value
+# and should not create it
+[windows] go env -w GOTMPDIR=$WORK\x\y\z
+[!windows] go env -w GOTMPDIR=$WORK/x/y/z
+! exists $WORK/x/y/z
+# we should be able to clear an env
+go env -u GOTMPDIR
+go env GOTMPDIR
+stdout ^$
+
+[windows] go env -w GOTMPDIR=$WORK\x\y\z
+[!windows] go env -w GOTMPDIR=$WORK/x/y/z
+go env -w GOTMPDIR=
+go env GOTMPDIR
+stdout ^$
+
+# go env -w rejects relative CC values
+[!windows] go env -w CC=/usr/bin/clang
+go env -w CC=clang
+[!windows] ! go env -w CC=./clang
+[!windows] ! go env -w CC=bin/clang
+[!windows] stderr 'go env -w: CC entry is relative; must be absolute path'
+
+[windows] go env -w CC=$WORK\bin\clang
+[windows] ! go env -w CC=.\clang
+[windows] ! go env -w CC=bin\clang
+[windows] stderr 'go env -w: CC entry is relative; must be absolute path'
+
+# go env -w rejects relative CXX values
+[!windows] go env -w CC=/usr/bin/cpp
+go env -w CXX=cpp
+[!windows] ! go env -w CXX=./cpp
+[!windows] ! go env -w CXX=bin/cpp
+[!windows] stderr 'go env -w: CXX entry is relative; must be absolute path'
+
+[windows] go env -w CXX=$WORK\bin\cpp
+[windows] ! go env -w CXX=.\cpp
+[windows] ! go env -w CXX=bin\cpp
+[windows] stderr 'go env -w: CXX entry is relative; must be absolute path'
+
+# go env -w/-u checks validity of GOOS/ARCH combinations
+env GOOS=
+env GOARCH=
+# check -w doesn't allow invalid GOOS
+! go env -w GOOS=linuxx
+stderr 'unsupported GOOS/GOARCH pair linuxx'
+# check -w doesn't allow invalid GOARCH
+! go env -w GOARCH=amd644
+stderr 'unsupported GOOS/GOARCH.*/amd644$'
+# check -w doesn't allow invalid GOOS with valid GOARCH
+! go env -w GOOS=linuxx GOARCH=amd64
+stderr 'unsupported GOOS/GOARCH pair linuxx'
+# check a valid GOOS and GOARCH values but an incompatible combinations
+! go env -w GOOS=android GOARCH=s390x
+stderr 'unsupported GOOS/GOARCH pair android/s390x'
+# check that -u considers explicit envs
+go env -w GOOS=linux GOARCH=mips
+env GOOS=windows
+! go env -u GOOS
+stderr 'unsupported GOOS/GOARCH.*windows/mips$'
diff --git a/src/cmd/go/testdata/script/fileline.txt b/src/cmd/go/testdata/script/fileline.txt
new file mode 100644
index 0000000..5cb35f0
--- /dev/null
+++ b/src/cmd/go/testdata/script/fileline.txt
@@ -0,0 +1,8 @@
+env GO111MODULE=off
+
+# look for short, relative file:line in error message
+! go run ../../gopath/x/y/z/err.go
+stderr ^..[\\/]x[\\/]y[\\/]z[\\/]err.go:
+
+-- ../x/y/z/err.go --
+package main; import "bar"
diff --git a/src/cmd/go/testdata/script/fmt_load_errors.txt b/src/cmd/go/testdata/script/fmt_load_errors.txt
new file mode 100644
index 0000000..297ec0f
--- /dev/null
+++ b/src/cmd/go/testdata/script/fmt_load_errors.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=off
+
+! go fmt does-not-exist
+
+go fmt -n exclude
+stdout 'exclude[/\\]x\.go'
+stdout 'exclude[/\\]x_linux\.go'
+
+-- exclude/empty/x.txt --
+-- exclude/ignore/_x.go --
+package x
+-- exclude/x.go --
+// +build linux,!linux
+
+package x
+-- exclude/x_linux.go --
+// +build windows
+
+package x
diff --git a/src/cmd/go/testdata/script/gccgo_link_c.txt b/src/cmd/go/testdata/script/gccgo_link_c.txt
new file mode 100644
index 0000000..422adea
--- /dev/null
+++ b/src/cmd/go/testdata/script/gccgo_link_c.txt
@@ -0,0 +1,16 @@
+# Issue #7573
+# cmd/cgo: undefined reference when linking a C-library using gccgo
+
+[!cgo] skip
+[!gccgo] skip
+
+go build -r -compiler gccgo cgoref
+stderr 'gccgo.*\-L [^ ]*alibpath \-lalib' # make sure that Go-inline "#cgo LDFLAGS:" ("-L alibpath -lalib") passed to gccgo linking stage
+
+-- cgoref/cgoref.go --
+package main
+// #cgo LDFLAGS: -L alibpath -lalib
+// void f(void) {}
+import "C"
+
+func main() { C.f() }
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/gccgo_m.txt b/src/cmd/go/testdata/script/gccgo_m.txt
new file mode 100644
index 0000000..b63ba46
--- /dev/null
+++ b/src/cmd/go/testdata/script/gccgo_m.txt
@@ -0,0 +1,19 @@
+# It's absurd, but builds with -compiler=gccgo used to fail to build module m.
+# golang.org/issue/34358
+
+env GO111MODULE=off
+
+[short] skip
+
+cd m
+go build
+exists m$GOEXE
+rm m$GOEXE
+[exec:gccgo] go build -compiler=gccgo
+[exec:gccgo] exists m$GOEXE
+
+-- m/go.mod --
+module m
+-- m/main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/gccgo_mangle.txt b/src/cmd/go/testdata/script/gccgo_mangle.txt
new file mode 100644
index 0000000..7a09a80
--- /dev/null
+++ b/src/cmd/go/testdata/script/gccgo_mangle.txt
@@ -0,0 +1,15 @@
+# Issue 33871.
+
+cd m/a.0
+go build
+
+-- m/go.mod --
+module m
+-- m/a.0/a.go --
+package a
+
+type T int
+
+func (t T) M() int {
+	return int(t)
+}
diff --git a/src/cmd/go/testdata/script/gcflags_patterns.txt b/src/cmd/go/testdata/script/gcflags_patterns.txt
new file mode 100644
index 0000000..f23cece
--- /dev/null
+++ b/src/cmd/go/testdata/script/gcflags_patterns.txt
@@ -0,0 +1,92 @@
+env GO111MODULE=off
+
+[!gc] skip 'using -gcflags and -ldflags'
+[short] skip
+
+env GOCACHE=$WORK/gocache  # Looking for compile commands, so need a clean cache.
+
+# -gcflags=-e applies to named packages, not dependencies
+go build -n -v -gcflags=-e z1 z2
+stderr 'compile.* -e.* -p z1'
+stderr 'compile.* -e.* -p z2'
+stderr 'compile.* -p y'
+! stderr 'compile.* -e.* -p [^z]'
+
+# -gcflags can specify package=flags, and can be repeated; last match wins
+go build -n -v -gcflags=-e -gcflags=z1=-N z1 z2
+stderr 'compile.* -N.* -p z1'
+! stderr 'compile.* -e.* -p z1'
+! stderr 'compile.* -N.* -p z2'
+stderr 'compile.* -e.* -p z2'
+stderr 'compile.* -p y'
+! stderr 'compile.* -e.* -p [^z]'
+! stderr 'compile.* -N.* -p [^z]'
+
+# -gcflags can have arbitrary spaces around the flags
+go build -n -v -gcflags='  z1 =  	-e 	' z1
+stderr 'compile.* -e.* -p z1'
+
+# -gcflags='all=-e' should apply to all packages, even with go test
+go test -c -n -gcflags='all=-e' z1
+stderr 'compile.* -e.* -p z3 '
+
+# this particular -gcflags argument made the compiler crash
+! go build -gcflags=-d=ssa/ z1
+stderr 'PhaseOptions usage'
+
+# -ldflags for implicit test package applies to test binary
+go test -c -n -gcflags=-N -ldflags=-X=x.y=z z1
+stderr 'compile.* -N .*z_test.go'
+stderr 'link.* -X=x.y=z'
+
+# -ldflags for explicit test package applies to test binary
+go test -c -n -gcflags=z1=-N -ldflags=z1=-X=x.y=z z1
+stderr 'compile.* -N .*z_test.go'
+stderr 'link.* -X=x.y=z'
+
+# -ldflags applies to link of command
+go build -n -ldflags=-X=math.pi=3 my/cmd/prog
+stderr 'link.* -X=math.pi=3'
+
+# -ldflags applies to link of command even with strange directory name
+go build -n -ldflags=-X=math.pi=3 my/cmd/prog/
+stderr 'link.* -X=math.pi=3'
+
+# -ldflags applies to current directory
+cd my/cmd/prog
+go build -n -ldflags=-X=math.pi=3
+stderr 'link.* -X=math.pi=3'
+
+# -ldflags applies to current directory even if GOPATH is funny
+[windows] cd $WORK/GoPath/src/my/cmd/prog
+[darwin] cd $WORK/GoPath/src/my/cmd/prog
+go build -n -ldflags=-X=math.pi=3
+stderr 'link.* -X=math.pi=3'
+
+# cgo.a should not be a dependency of internally-linked go package
+go build -ldflags='-linkmode=external -linkmode=internal' -n prog.go
+! stderr 'packagefile .*runtime/cgo.a'
+
+-- z1/z.go --
+package z1
+import _ "y"
+import _ "z2"
+
+-- z1/z_test.go --
+package z1_test
+import "testing"
+import _ "z3"
+func Test(t *testing.T) {}
+
+-- z2/z.go --
+package z2
+
+-- z3/z.go --
+package z3
+
+-- y/y.go --
+package y
+
+-- my/cmd/prog/prog.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/generate.txt b/src/cmd/go/testdata/script/generate.txt
new file mode 100644
index 0000000..c3c563e
--- /dev/null
+++ b/src/cmd/go/testdata/script/generate.txt
@@ -0,0 +1,91 @@
+[short] skip
+
+# Install an echo command because Windows doesn't have it.
+env GOBIN=$WORK/tmp/bin
+go install echo.go
+env PATH=$GOBIN${:}$PATH
+
+# Test go generate handles a simple command
+go generate ./generate/simple.go
+stdout 'Success'
+
+# Test go generate handles a command alias
+go generate './generate/alias.go'
+stdout 'Now is the time for all good men'
+
+# Test go generate's variable substitution
+go generate './generate/substitution.go'
+stdout $GOARCH' substitution.go:7 pabc xyzp/substitution.go/123'
+
+# Test go generate's run flag
+go generate -run y.s './generate/flag.go'
+stdout 'yes' # flag.go should select yes
+! stdout 'no' # flag.go should not select no
+
+# Test go generate provides the right "$GOPACKAGE" name in an x_test
+go generate './generate/env_test.go'
+stdout 'main_test'
+
+-- echo.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	fmt.Println(strings.Join(os.Args[1:], " "))
+	fmt.Println()
+}
+-- generate/simple.go --
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Simple test for go generate.
+
+// We include a build tag that go generate should ignore.
+
+// +build ignore
+
+//go:generate echo Success
+
+package p
+-- generate/alias.go --
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test that go generate handles command aliases.
+
+//go:generate -command run echo Now is the time
+//go:generate run for all good men
+
+package p
+-- generate/substitution.go --
+// Copyright 2014 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test go generate variable substitution.
+
+//go:generate echo $GOARCH $GOFILE:$GOLINE ${GOPACKAGE}abc xyz$GOPACKAGE/$GOFILE/123
+
+package p
+-- generate/flag.go --
+// Copyright 2015 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Test -run flag
+
+//go:generate echo oh yes my man
+//go:generate echo no, no, a thousand times no
+
+package p
+-- generate/env_test.go --
+package main_test
+
+//go:generate echo $GOPACKAGE
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/generate_bad_imports.txt b/src/cmd/go/testdata/script/generate_bad_imports.txt
new file mode 100644
index 0000000..4d31573
--- /dev/null
+++ b/src/cmd/go/testdata/script/generate_bad_imports.txt
@@ -0,0 +1,15 @@
+[windows] skip # skip because windows has no echo command
+
+go generate gencycle
+stdout 'hello world' # check go generate gencycle ran the generator
+
+-- go.mod --
+module gencycle
+
+go 1.16
+-- gencycle.go --
+//go:generate echo hello world
+
+package gencycle
+
+import _ "gencycle"
diff --git a/src/cmd/go/testdata/script/generate_env.txt b/src/cmd/go/testdata/script/generate_env.txt
new file mode 100644
index 0000000..2df1663
--- /dev/null
+++ b/src/cmd/go/testdata/script/generate_env.txt
@@ -0,0 +1,32 @@
+# Install an env command because Windows and plan9 don't have it.
+env GOBIN=$WORK/tmp/bin
+go install env.go
+[plan9] env path=$GOBIN${:}$path
+[!plan9] env PATH=$GOBIN${:}$PATH
+
+# Test generators have access to the environment
+go generate ./printenv.go
+stdout '^GOARCH='$GOARCH
+stdout '^GOOS='$GOOS
+stdout '^GOFILE='
+stdout '^GOLINE='
+stdout '^GOPACKAGE='
+stdout '^DOLLAR='
+
+-- env.go --
+package main
+
+import (
+	"fmt"
+	"os"
+)
+
+func main() {
+	for _, v := range os.Environ() {
+		fmt.Println(v)
+	}
+}
+-- printenv.go --
+package main
+
+//go:generate env
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/generate_invalid.txt b/src/cmd/go/testdata/script/generate_invalid.txt
new file mode 100644
index 0000000..e18e62c
--- /dev/null
+++ b/src/cmd/go/testdata/script/generate_invalid.txt
@@ -0,0 +1,203 @@
+[short] skip
+
+# Install an echo command because Windows doesn't have it.
+env GOBIN=$WORK/tmp/bin
+go install echo.go
+env PATH=$GOBIN${:}$PATH
+
+# Test go generate for directory with no go files
+go generate ./nogo
+! stdout 'Fail'
+
+# Test go generate for package where all .go files are excluded by build
+# constraints
+go generate -v ./excluded
+! stdout 'Fail'
+! stderr 'go' # -v shouldn't list any files
+
+# Test go generate for "package" with no package clause in any file
+go generate ./nopkg
+stdout 'Success a'
+! stdout 'Fail'
+
+# Test go generate for package with inconsistent package clauses
+# $GOPACKAGE should depend on each file's package clause
+go generate ./inconsistent
+stdout 'Success a'
+stdout 'Success b'
+stdout -count=2 'Success c'
+! stdout 'Fail'
+
+# Test go generate for syntax errors before and after package clauses
+go generate ./syntax
+stdout 'Success a'
+stdout 'Success b'
+! stdout 'Fail'
+
+# Test go generate for files importing non-existent packages
+go generate ./importerr
+stdout 'Success a'
+stdout 'Success b'
+stdout 'Success c'
+
+-- echo.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	fmt.Println(strings.Join(os.Args[1:], " "))
+	fmt.Println()
+}
+
+-- go.mod --
+module m
+
+go 1.16
+-- nogo/foo.txt --
+Text file in a directory without go files.
+Go generate should ignore this directory.
+//go:generate echo Fail nogo
+
+-- excluded/a.go --
+// Include a build tag that go generate should exclude.
+// Go generate should ignore this file.
+
+// +build a
+
+//go:generate echo Fail a
+
+package excluded
+
+-- excluded/b.go --
+// Include a build tag that go generate should exclude.
+// Go generate should ignore this file.
+
+//go:generate echo Fail b
+
+// +build b
+
+package excluded
+
+
+-- nopkg/a.go --
+// Go file with package clause after comment.
+// Go generate should process this file.
+
+/* Pre-comment */ package nopkg
+//go:generate echo Success a
+
+-- nopkg/b.go --
+// Go file with commented package clause.
+// Go generate should ignore this file.
+
+//package nopkg
+
+//go:generate echo Fail b
+
+-- nopkg/c.go --
+// Go file with package clause inside multiline comment.
+// Go generate should ignore this file.
+
+/*
+package nopkg
+*/
+
+//go:generate echo Fail c
+
+-- nopkg/d.go --
+// Go file with package clause inside raw string literal.
+// Go generate should ignore this file.
+
+const foo = `
+package nopkg
+`
+//go:generate echo Fail d
+
+-- nopkg/e.go --
+// Go file without package clause.
+// Go generate should ignore this file.
+
+//go:generate echo Fail e
+
+-- inconsistent/a.go --
+// Valid go file with inconsistent package name.
+// Go generate should process this file with GOPACKAGE=a
+
+package a
+//go:generate echo Success $GOPACKAGE
+
+-- inconsistent/b.go --
+// Valid go file with inconsistent package name.
+// Go generate should process this file with GOPACKAGE=b
+
+//go:generate echo Success $GOPACKAGE
+package b
+
+-- inconsistent/c.go --
+// Go file with two package clauses.
+// Go generate should process this file with GOPACKAGE=c
+
+//go:generate echo Success $GOPACKAGE
+package c
+// Invalid package clause, should be ignored:
+package cinvalid
+//go:generate echo Success $GOPACKAGE
+
+-- inconsistent/d.go --
+// Go file with invalid package name.
+// Go generate should ignore this file.
+
+package +d+
+//go:generate echo Fail $GOPACKAGE
+
+-- syntax/a.go --
+// Go file with syntax error after package clause.
+// Go generate should process this file.
+
+package syntax
+123
+//go:generate echo Success a
+
+-- syntax/b.go --
+// Go file with syntax error after package clause.
+// Go generate should process this file.
+
+package syntax; 123
+//go:generate echo Success b
+
+-- syntax/c.go --
+// Go file with syntax error before package clause.
+// Go generate should ignore this file.
+
+foo
+package syntax
+//go:generate echo Fail c
+
+-- importerr/a.go --
+// Go file which imports non-existing package.
+// Go generate should process this file.
+
+package importerr
+//go:generate echo Success a
+import "foo"
+
+-- importerr/b.go --
+// Go file which imports non-existing package.
+// Go generate should process this file.
+
+//go:generate echo Success b
+package importerr
+import "bar"
+
+-- importerr/c.go --
+// Go file which imports non-existing package.
+// Go generate should process this file.
+
+package importerr
+import "moo"
+//go:generate echo Success c
diff --git a/src/cmd/go/testdata/script/get_404_meta.txt b/src/cmd/go/testdata/script/get_404_meta.txt
new file mode 100644
index 0000000..b71cc7f
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_404_meta.txt
@@ -0,0 +1,11 @@
+# golang.org/issue/13037: 'go get' was not parsing <meta> tags in 404 served over HTTPS.
+
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=off
+go get -d -insecure bazil.org/fuse/fs/fstestutil
+
+env GO111MODULE=on
+env GOPROXY=direct
+go get -d -insecure bazil.org/fuse/fs/fstestutil
diff --git a/src/cmd/go/testdata/script/get_brace.txt b/src/cmd/go/testdata/script/get_brace.txt
new file mode 100644
index 0000000..3449a0c
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_brace.txt
@@ -0,0 +1,51 @@
+env GO111MODULE=off
+
+[!exec:git] skip
+
+# Set up some empty repositories.
+cd $WORK/_origin/foo
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+cd $WORK
+cd '_origin/{confusing}'
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+# Clone the empty repositories into GOPATH.
+# This tells the Go command where to find them: it takes the place of a user's meta-tag redirector.
+mkdir $GOPATH/src/example.com
+cd $GOPATH/src/example.com
+exec git clone $WORK/_origin/foo
+exec git clone $WORK/_origin/{confusing}
+
+# Commit contents to the repositories.
+cd $WORK/_origin/foo
+exec git add main.go
+exec git commit -m 'add main'
+
+cd $WORK
+cd '_origin/{confusing}'
+exec git add confusing.go
+exec git commit -m 'just try to delete this!'
+
+# 'go get' should refuse to download or update the confusingly-named repo.
+cd $GOPATH/src/example.com/foo
+! go get -u 'example.com/{confusing}'
+stderr 'invalid char'
+! go get -u example.com/foo
+stderr 'invalid import path'
+! exists example.com/{confusing}
+
+-- $WORK/_origin/foo/main.go --
+package main
+import _ "example.com/{confusing}"
+
+func main() {}
+
+-- $WORK/_origin/{confusing}/confusing.go --
+package confusing
diff --git a/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt b/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt
new file mode 100644
index 0000000..cda25e1
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_custom_domain_wildcard.txt
@@ -0,0 +1,6 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get -u rsc.io/pdf/...
+exists $GOPATH/bin/pdfpasswd$GOEXE
diff --git a/src/cmd/go/testdata/script/get_dash_t.txt b/src/cmd/go/testdata/script/get_dash_t.txt
new file mode 100644
index 0000000..baac916
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dash_t.txt
@@ -0,0 +1,9 @@
+# Tests issue 8181
+
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get -v -t github.com/rsc/go-get-issue-8181/a github.com/rsc/go-get-issue-8181/b
+go list ...
+stdout 'x/build/gerrit'
diff --git a/src/cmd/go/testdata/script/get_domain_root.txt b/src/cmd/go/testdata/script/get_domain_root.txt
new file mode 100644
index 0000000..9187848
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_domain_root.txt
@@ -0,0 +1,20 @@
+# Tests issue #9357
+# go get foo.io (not foo.io/subdir) was not working consistently.
+
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# go-get-issue-9357.appspot.com is running
+# the code at github.com/rsc/go-get-issue-9357,
+# a trivial Go on App Engine app that serves a
+# <meta> tag for the domain root.
+go get -d go-get-issue-9357.appspot.com
+go get go-get-issue-9357.appspot.com
+go get -u go-get-issue-9357.appspot.com
+
+rm $GOPATH/src/go-get-issue-9357.appspot.com
+go get go-get-issue-9357.appspot.com
+
+rm $GOPATH/src/go-get-issue-9357.appspot.com
+go get -u go-get-issue-9357.appspot.com
diff --git a/src/cmd/go/testdata/script/get_dot_slash_download.txt b/src/cmd/go/testdata/script/get_dot_slash_download.txt
new file mode 100644
index 0000000..dbaf46c
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dot_slash_download.txt
@@ -0,0 +1,10 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# Tests Issues #9797 and #19769
+
+mkdir $WORK/tmp/src/rsc.io
+env GOPATH=$WORK/tmp
+cd $WORK/tmp/src/rsc.io
+go get ./pprof_mac_fix
diff --git a/src/cmd/go/testdata/script/get_dotfiles.txt b/src/cmd/go/testdata/script/get_dotfiles.txt
new file mode 100644
index 0000000..6757f9d
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_dotfiles.txt
@@ -0,0 +1,64 @@
+env GO111MODULE=off
+[short] skip
+
+[!exec:git] skip
+
+# Set up a benign repository and a repository with a dotfile name.
+cd $WORK/_origin/foo
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+cd $WORK/_origin/.hidden
+exec git init
+exec git config user.name 'Nameless Gopher'
+exec git config user.email 'nobody@golang.org'
+exec git commit --allow-empty -m 'create master branch'
+
+# Clone the empty repositories into GOPATH.
+# This tells the Go command where to find them: it takes the place of a user's meta-tag redirector.
+mkdir $GOPATH/src/example.com
+cd $GOPATH/src/example.com
+exec git clone $WORK/_origin/foo
+exec git clone $WORK/_origin/.hidden
+
+# Add a benign commit.
+cd $WORK/_origin/foo
+cp _ok/main.go main.go
+exec git add main.go
+exec git commit -m 'add ok'
+
+# 'go get' should install the benign commit.
+cd $GOPATH
+go get -u example.com/foo
+
+# Now sneak in an import of a dotfile path.
+cd $WORK/_origin/.hidden
+exec git add hidden.go
+exec git commit -m 'nothing to see here, move along'
+
+cd $WORK/_origin/foo
+cp _sneaky/main.go main.go
+exec git add main.go
+exec git commit -m 'fix typo (heh heh heh)'
+
+# 'go get -u' should refuse to download or update the dotfile-named repo.
+cd $GOPATH/src/example.com/foo
+! go get -u example.com/foo
+stderr 'leading dot'
+! exists example.com/.hidden/hidden.go
+
+-- $WORK/_origin/foo/_ok/main.go --
+package main
+
+func main() {}
+
+-- $WORK/_origin/foo/_sneaky/main.go --
+package main
+import _ "example.com/.hidden"
+
+func main() {}
+
+-- $WORK/_origin/.hidden/hidden.go --
+package hidden
diff --git a/src/cmd/go/testdata/script/get_go_file.txt b/src/cmd/go/testdata/script/get_go_file.txt
new file mode 100644
index 0000000..bed8720
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_go_file.txt
@@ -0,0 +1,60 @@
+# Tests Issue #38478
+# Tests that go get in GOPATH mode returns a specific error if the argument
+# ends with '.go', and either has no slash or refers to an existing file.
+
+env GO111MODULE=off
+
+# argument doesn't have .go suffix
+go get -d test
+
+# argument has .go suffix, is a file and exists
+! go get -d test.go
+stderr 'go get test.go: arguments must be package or module paths'
+
+# argument has .go suffix, doesn't exist and has no slashes
+! go get -d test_missing.go
+stderr 'go get test_missing.go: arguments must be package or module paths'
+
+# argument has .go suffix, is a file and exists in sub-directory
+! go get -d test/test.go
+stderr 'go get: test/test.go exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, doesn't exist and has slashes
+! go get -d test/test_missing.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, is a symlink and exists
+[symlink] symlink test_sym.go -> test.go
+[symlink] ! go get -d test_sym.go
+[symlink] stderr 'go get test_sym.go: arguments must be package or module paths'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a symlink and exists in sub-directory
+[symlink] symlink test/test_sym.go -> test.go
+[symlink] ! go get -d test/test_sym.go
+[symlink] stderr 'go get: test/test_sym.go exists as a file, but ''go get'' requires package arguments'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a directory and exists
+mkdir test_dir.go
+! go get -d test_dir.go
+stderr 'go get test_dir.go: arguments must be package or module paths'
+rm test_dir.go
+
+# argument has .go suffix, is a directory and exists in sub-directory
+mkdir test/test_dir.go
+! go get -d test/test_dir.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+rm test/test_dir.go
+
+
+-- test.go --
+package main
+func main() {println("test")}
+
+
+-- test/test.go --
+package main
+func main() {println("test")}
diff --git a/src/cmd/go/testdata/script/get_goroot.txt b/src/cmd/go/testdata/script/get_goroot.txt
new file mode 100644
index 0000000..929435a
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_goroot.txt
@@ -0,0 +1,53 @@
+[!net] skip
+env GO111MODULE=off
+
+# Issue 4186. go get cannot be used to download packages to $GOROOT.
+# Test that without GOPATH set, go get should fail.
+
+# Fails because GOROOT=GOPATH
+env GOPATH=$WORK/tmp
+env GOROOT=$WORK/tmp
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+# Fails because GOROOT=GOPATH after cleaning.
+env GOPATH=$WORK/tmp/
+env GOROOT=$WORK/tmp
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+env GOPATH=$WORK/tmp
+env GOROOT=$WORK/tmp/
+! go get -d github.com/golang/example/hello
+stderr 'warning: GOPATH set to GOROOT'
+stderr '\$GOPATH must not be set to \$GOROOT'
+
+# Make a home directory
+mkdir $WORK/home/go
+
+# Fails because GOROOT=$HOME/go so default GOPATH unset.
+[windows] env USERPROFILE=$WORK/home
+[plan9] env home=$WORK/home
+[!windows] [!plan9] env HOME=$WORK/home
+env GOPATH=
+env GOROOT=$WORK/home/go
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
+
+[windows] env USERPROFILE=$WORK/home/
+[plan9] env home=$WORK/home/
+[!windows] [!plan9] env HOME=$WORK/home/
+env GOPATH=
+env GOROOT=$WORK/home/go
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
+
+[windows] env USERPROFILE=$WORK/home
+[plan9] env home=$WORK/home
+[!windows] [!plan9] env HOME=$WORK/home
+env GOPATH=
+env GOROOT=$WORK/home/go/
+! go get -d github.com/golang/example/hello
+stderr '\$GOPATH not set'
diff --git a/src/cmd/go/testdata/script/get_insecure.txt b/src/cmd/go/testdata/script/get_insecure.txt
new file mode 100644
index 0000000..36ad2c0
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure.txt
@@ -0,0 +1,51 @@
+# TODO(matloob): Split this test into two? It's one of the slowest tests we have.
+
+[!net] skip
+[!exec:git] skip
+
+env PATH=$WORK/tmp/bin${:}$PATH
+go build -o $WORK/tmp/bin/ssh ssh.go
+
+# GOPATH: Set up
+env GO111MODULE=off
+
+# GOPATH: Try go get -d of HTTP-only repo (should fail).
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try again with -insecure (should succeed).
+go get -d -insecure insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating without -insecure (should fail).
+! go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# Modules: Set up
+env GOPATH=$WORK/m/gp
+mkdir $WORK/m
+cp module_file $WORK/m/go.mod
+cd $WORK/m
+env GO111MODULE=on
+env GOPROXY=''
+
+# Modules: Try go get -d of HTTP-only repo (should fail).
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# Modules: Try again with -insecure (should succeed).
+go get -d -insecure insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# Modules: Try updating without -insecure (should fail).
+! go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+go list -m ...
+stdout 'insecure.go-get-issue'
+
+-- ssh.go --
+// stub out uses of ssh by go get
+package main
+
+import "os"
+
+func main() {
+	os.Exit(1)
+}
+-- module_file --
+module m
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/get_insecure_custom_domain.txt b/src/cmd/go/testdata/script/get_insecure_custom_domain.txt
new file mode 100644
index 0000000..a4a6fd4
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_custom_domain.txt
@@ -0,0 +1,6 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+go get -d -insecure insecure.go-get-issue-15410.appspot.com/pkg/p
diff --git a/src/cmd/go/testdata/script/get_insecure_deprecated.txt b/src/cmd/go/testdata/script/get_insecure_deprecated.txt
new file mode 100644
index 0000000..7f5f5c7
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_deprecated.txt
@@ -0,0 +1,21 @@
+# GOPATH: Set up
+env GO111MODULE=off
+
+# GOPATH: Fetch without insecure, no warning
+! go get test
+! stderr 'go get: -insecure flag is deprecated; see ''go help get'' for details'
+
+# GOPATH: Fetch with insecure, should warn
+! go get -insecure test
+stderr 'go get: -insecure flag is deprecated; see ''go help get'' for details'
+
+# Modules: Set up
+env GO111MODULE=on
+
+# Modules: Fetch without insecure, no warning
+! go get test
+! stderr 'go get: -insecure flag is deprecated; see ''go help get'' for details'
+
+# Modules: Fetch with insecure, should warn
+! go get -insecure test
+stderr 'go get: -insecure flag is deprecated; see ''go help get'' for details'
diff --git a/src/cmd/go/testdata/script/get_insecure_env.txt b/src/cmd/go/testdata/script/get_insecure_env.txt
new file mode 100644
index 0000000..8d88427
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_env.txt
@@ -0,0 +1,29 @@
+[!net] skip
+[!exec:git] skip
+
+# GOPATH: Set up
+env GO111MODULE=off
+
+# GOPATH: Try go get -d of HTTP-only repo (should fail).
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try again with invalid GOINSECURE (should fail).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com/pkg/q
+! go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try with correct GOINSECURE (should succeed).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com/pkg/p
+go get -d insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating without GOINSECURE (should fail).
+env GOINSECURE=
+! go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating with GOINSECURE glob (should succeed).
+env GOINSECURE=*.go-get-*.appspot.com
+go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
+# GOPATH: Try updating with GOINSECURE base URL (should succeed).
+env GOINSECURE=insecure.go-get-issue-15410.appspot.com
+go get -d -u -f insecure.go-get-issue-15410.appspot.com/pkg/p
+
diff --git a/src/cmd/go/testdata/script/get_insecure_redirect.txt b/src/cmd/go/testdata/script/get_insecure_redirect.txt
new file mode 100644
index 0000000..0478d1f
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_redirect.txt
@@ -0,0 +1,12 @@
+# golang.org/issue/29591: 'go get' was following plain-HTTP redirects even without -insecure.
+# golang.org/issue/34049: 'go get' would panic in case of an insecure redirect in GOPATH mode
+
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=off
+
+! go get -d vcs-test.golang.org/insecure/go/insecure
+stderr 'redirected .* to insecure URL'
+
+go get -d -insecure vcs-test.golang.org/insecure/go/insecure
diff --git a/src/cmd/go/testdata/script/get_insecure_update.txt b/src/cmd/go/testdata/script/get_insecure_update.txt
new file mode 100644
index 0000000..4511c98
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_insecure_update.txt
@@ -0,0 +1,12 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# Clone the repo via HTTP manually.
+exec git clone -q http://github.com/golang/example github.com/golang/example
+
+# Update without -insecure should fail.
+# Update with -insecure should succeed.
+# We need -f to ignore import comments.
+! go get -d -u -f github.com/golang/example/hello
+go get -d -u -f -insecure github.com/golang/example/hello
diff --git a/src/cmd/go/testdata/script/get_internal_wildcard.txt b/src/cmd/go/testdata/script/get_internal_wildcard.txt
new file mode 100644
index 0000000..ff20d4b
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_internal_wildcard.txt
@@ -0,0 +1,6 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# This used to fail with errors about internal packages
+go get github.com/rsc/go-get-issue-11960/...
diff --git a/src/cmd/go/testdata/script/get_issue11307.txt b/src/cmd/go/testdata/script/get_issue11307.txt
new file mode 100644
index 0000000..9d6b7dd
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_issue11307.txt
@@ -0,0 +1,9 @@
+# go get -u was not working except in checkout directory
+
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+env GOPATH=$WORK/tmp/gopath
+go get github.com/rsc/go-get-issue-11307
+go get -u github.com/rsc/go-get-issue-11307 # was failing
diff --git a/src/cmd/go/testdata/script/get_legacy.txt b/src/cmd/go/testdata/script/get_legacy.txt
new file mode 100644
index 0000000..938d428
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_legacy.txt
@@ -0,0 +1,58 @@
+# This test was converted from a test in vendor_test.go (which no longer exists).
+# That seems to imply that it's about vendoring semantics, but the test doesn't
+# use 'go -mod=vendor' (and none of the fetched repos have vendor folders).
+# The test still seems to be useful as a test of direct-mode go get.
+
+[short] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+env GOPATH=$WORK/tmp/d1
+go get vcs-test.golang.org/git/modlegacy1-old.git/p1
+go list -f '{{.Deps}}' vcs-test.golang.org/git/modlegacy1-old.git/p1
+stdout 'new.git/p2' # old/p1 should depend on new/p2
+! stdout new.git/v2/p2 # old/p1 should NOT depend on new/v2/p2
+go build vcs-test.golang.org/git/modlegacy1-old.git/p1 vcs-test.golang.org/git/modlegacy1-new.git/p1
+! stdout .
+
+env GOPATH=$WORK/tmp/d2
+
+rm $GOPATH
+go get github.com/rsc/vgotest5
+go get github.com/rsc/vgotest4
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest4
+go get github.com/rsc/vgotest5
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/rsc/vgotest5
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4
+go get github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat github.com/rsc/vgotest4 github.com/rsc/vgotest5
+
+rm $GOPATH
+go get github.com/myitcv/vgo_example_compat github.com/rsc/vgotest5 github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/myitcv/vgo_example_compat github.com/rsc/vgotest5
+
+rm $GOPATH
+go get github.com/rsc/vgotest4 github.com/rsc/vgotest5 github.com/myitcv/vgo_example_compat
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/myitcv/vgo_example_compat github.com/rsc/vgotest4
+
+rm $GOPATH
+go get github.com/rsc/vgotest5 github.com/rsc/vgotest4 github.com/myitcv/vgo_example_compat
diff --git a/src/cmd/go/testdata/script/get_non_pkg.txt b/src/cmd/go/testdata/script/get_non_pkg.txt
new file mode 100644
index 0000000..a878530
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_non_pkg.txt
@@ -0,0 +1,14 @@
+[!net] skip
+[!exec:git] skip
+
+env GOBIN=$WORK/tmp/gobin
+env GO111MODULE=off
+
+! go get -d golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
+
+! go get -d -u golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
+
+! go get -d golang.org/x/tools
+stderr 'golang.org/x/tools: no Go files'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/get_race.txt b/src/cmd/go/testdata/script/get_race.txt
new file mode 100644
index 0000000..16a560a
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_race.txt
@@ -0,0 +1,8 @@
+# Tests issue #20502
+
+[!net] skip
+[!exec:git] skip
+[!race] skip
+env GO111MODULE=off
+
+go get -race github.com/rsc/go-get-issue-9224-cmd
diff --git a/src/cmd/go/testdata/script/get_test_only.txt b/src/cmd/go/testdata/script/get_test_only.txt
new file mode 100644
index 0000000..a3f38dd
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_test_only.txt
@@ -0,0 +1,6 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get golang.org/x/tour/content...
+go get -t golang.org/x/tour/content...
diff --git a/src/cmd/go/testdata/script/get_tilde.txt b/src/cmd/go/testdata/script/get_tilde.txt
new file mode 100644
index 0000000..e520957
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_tilde.txt
@@ -0,0 +1,24 @@
+env GO111MODULE=off
+[short] skip
+
+# Paths containing windows short names should be rejected before attempting to fetch.
+! go get example.com/longna~1.dir/thing
+stderr 'trailing tilde and digits'
+! go get example.com/longna~1/thing
+stderr 'trailing tilde and digits'
+! go get example.com/~9999999/thing
+stderr 'trailing tilde and digits'
+
+# A path containing an element that is just a tilde, or a tilde followed by non-digits,
+# should attempt to resolve.
+! go get example.com/~glenda/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
+
+! go get example.com/~glenda2/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
+
+! go get example.com/~/notfound
+! stderr 'trailing tilde and digits'
+stderr 'unrecognized import path'
diff --git a/src/cmd/go/testdata/script/get_update.txt b/src/cmd/go/testdata/script/get_update.txt
new file mode 100644
index 0000000..9afce6a
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update.txt
@@ -0,0 +1,25 @@
+# Tests Issue #9224
+# The recursive updating was trying to walk to
+# former dependencies, not current ones.
+
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# Rewind
+go get github.com/rsc/go-get-issue-9224-cmd
+cd $GOPATH/src/github.com/rsc/go-get-issue-9224-lib
+exec git reset --hard HEAD~
+cd $GOPATH/src
+
+# Run get
+go get -u 'github.com/rsc/go-get-issue-9224-cmd'
+
+# (Again with -d -u) Rewind
+go get github.com/rsc/go-get-issue-9224-cmd
+cd $GOPATH/src/github.com/rsc/go-get-issue-9224-lib
+exec git reset --hard HEAD~
+cd $GOPATH/src
+
+# (Again with -d -u) Run get
+go get -d -u 'github.com/rsc/go-get-issue-9224-cmd'
diff --git a/src/cmd/go/testdata/script/get_update_all.txt b/src/cmd/go/testdata/script/get_update_all.txt
new file mode 100644
index 0000000..2b75849
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_all.txt
@@ -0,0 +1,9 @@
+# Issue 14444: go get -u .../ duplicate loads errors
+# Check that go get update -u ... does not try to load duplicates
+
+[!net] skip
+
+env GO111MODULE=off
+
+go get -u -n .../
+! stderr 'duplicate loads of' # make sure old packages are removed from cache
diff --git a/src/cmd/go/testdata/script/get_update_unknown_protocol.txt b/src/cmd/go/testdata/script/get_update_unknown_protocol.txt
new file mode 100644
index 0000000..b00adea
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_unknown_protocol.txt
@@ -0,0 +1,14 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+# Clone the repo via HTTPS manually.
+exec git clone -q https://github.com/golang/example github.com/golang/example
+
+# Configure the repo to use a protocol unknown to cmd/go
+# that still actually works.
+cd github.com/golang/example
+exec git remote set-url origin xyz://github.com/golang/example
+exec git config --local url.https://github.com/.insteadOf xyz://github.com/
+
+go get -d -u -f github.com/golang/example/hello
diff --git a/src/cmd/go/testdata/script/get_update_wildcard.txt b/src/cmd/go/testdata/script/get_update_wildcard.txt
new file mode 100644
index 0000000..4e66004
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_update_wildcard.txt
@@ -0,0 +1,16 @@
+# Issue 14450: go get -u .../ tried to import not downloaded package
+
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get github.com/tmwh/go-get-issue-14450/a
+! go get -u .../
+stderr 'cannot find package.*d-dependency/e'
+
+# Even though get -u failed, the source for others should be downloaded.
+exists github.com/tmwh/go-get-issue-14450/b
+exists github.com/tmwh/go-get-issue-14450-b-dependency/c
+exists github.com/tmwh/go-get-issue-14450-b-dependency/d
+
+! exists github.com/tmwh/go-get-issue-14450-c-dependency/e
diff --git a/src/cmd/go/testdata/script/get_vcs_error_message.txt b/src/cmd/go/testdata/script/get_vcs_error_message.txt
new file mode 100644
index 0000000..8dc84fc
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_vcs_error_message.txt
@@ -0,0 +1,9 @@
+# Test that the Version Control error message includes the correct directory
+env GO111MODULE=off
+! go get -u foo
+stderr gopath(\\\\|/)src(\\\\|/)foo
+
+-- foo/foo.go --
+package foo
+-- math/math.go --
+package math
diff --git a/src/cmd/go/testdata/script/get_vendor.txt b/src/cmd/go/testdata/script/get_vendor.txt
new file mode 100644
index 0000000..4ebb8a2
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_vendor.txt
@@ -0,0 +1,95 @@
+[short] skip
+env GO111MODULE=off
+
+cd $GOPATH/src/v
+go run m.go
+go test
+go list -f '{{.Imports}}'
+stdout 'v/vendor/vendor.org/p'
+go list -f '{{.TestImports}}'
+stdout 'v/vendor/vendor.org/p'
+go get -d
+go get -t -d
+
+[!net] stop
+[!exec:git] stop
+
+cd $GOPATH/src
+
+# Update
+go get 'github.com/rsc/go-get-issue-11864'
+go get -u 'github.com/rsc/go-get-issue-11864'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# get -u
+rm $GOPATH
+mkdir $GOPATH/src
+go get -u 'github.com/rsc/go-get-issue-11864'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# get -t -u
+rm $GOPATH
+mkdir $GOPATH/src
+go get -t -u 'github.com/rsc/go-get-issue-11864/...'
+exists github.com/rsc/go-get-issue-11864/vendor
+
+# Submodules
+rm $GOPATH
+mkdir $GOPATH/src
+go get -d 'github.com/rsc/go-get-issue-12612'
+go get -u -d 'github.com/rsc/go-get-issue-12612'
+exists github.com/rsc/go-get-issue-12612/vendor/golang.org/x/crypto/.git
+
+# Bad vendor (bad/imp)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/imp2)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp2'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/imp3)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/imp3'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+# Bad vendor (bad/...)
+rm $GOPATH
+mkdir $GOPATH/src
+! go get -t -u 'github.com/rsc/go-get-issue-18219/bad/...'
+stderr 'must be imported as'
+! exists github.com/rsc/go-get-issue-11864/vendor
+
+-- v/m.go --
+package main
+
+import (
+	"fmt"
+	"vendor.org/p"
+)
+
+func main() {
+	fmt.Println(p.C)
+}
+-- v/m_test.go --
+package main
+import (
+	"fmt"
+	"testing"
+	"vendor.org/p"
+)
+
+func TestNothing(t *testing.T) {
+	fmt.Println(p.C)
+}
+-- v/vendor/vendor.org/p/p.go --
+package p
+const C = 1
diff --git a/src/cmd/go/testdata/script/get_with_git_trace.txt b/src/cmd/go/testdata/script/get_with_git_trace.txt
new file mode 100644
index 0000000..98854c7
--- /dev/null
+++ b/src/cmd/go/testdata/script/get_with_git_trace.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=off
+
+env GIT_TRACE=1
+
+[!net] skip
+[!exec:git] skip
+
+# go get should be success when GIT_TRACE set
+go get golang.org/x/text
diff --git a/src/cmd/go/testdata/script/goflags.txt b/src/cmd/go/testdata/script/goflags.txt
new file mode 100644
index 0000000..686d113
--- /dev/null
+++ b/src/cmd/go/testdata/script/goflags.txt
@@ -0,0 +1,59 @@
+env GO111MODULE=off
+
+# GOFLAGS sets flags for commands
+
+env GOFLAGS='-e -f={{.Dir}} --test.benchtime=1s -count=10'
+go list asdfasdfasdf  # succeeds because of -e
+go list runtime
+stdout '[\\/]runtime$'
+
+env GOFLAGS=-race OLDGOARCH=$GOARCH OLDGOOS=$GOOS GOARCH=386 GOOS=linux
+! go list runtime
+stderr 'race is only supported on'
+
+env GOARCH=$OLDGOARCH GOOS=$OLDGOOS
+
+# go env succeeds even though -f={{.Dir}} is inappropriate
+go env
+
+# bad flags are diagnosed
+env GOFLAGS=-typoflag
+! go list runtime
+stderr 'unknown flag -typoflag'
+
+env GOFLAGS=-
+! go list runtime
+stderr '^go: parsing \$GOFLAGS: non-flag "-"'
+
+env GOFLAGS=--
+! go list runtime
+stderr '^go: parsing \$GOFLAGS: non-flag "--"'
+
+env GOFLAGS=---oops
+! go list runtime
+stderr '^go: parsing \$GOFLAGS: non-flag "---oops"'
+
+env GOFLAGS=-=noname
+! go list runtime
+stderr '^go: parsing \$GOFLAGS: non-flag "-=noname"'
+
+env GOFLAGS=-f
+! go list runtime
+stderr '^go: flag needs an argument: -f \(from (\$GOFLAGS|%GOFLAGS%)\)$'
+
+env GOFLAGS=-e=asdf
+! go list runtime
+stderr '^go: invalid boolean value \"asdf\" for flag -e \(from (\$GOFLAGS|%GOFLAGS%)\)'
+
+# except in go bug (untested) and go env
+go env
+stdout GOFLAGS
+
+# Flags listed in GOFLAGS should be safe to duplicate on the command line.
+env GOFLAGS=-tags=magic
+go list -tags=magic
+go test -tags=magic -c -o $devnull
+go vet -tags=magic
+
+-- foo_test.go --
+package foo
diff --git a/src/cmd/go/testdata/script/gopath_install.txt b/src/cmd/go/testdata/script/gopath_install.txt
new file mode 100644
index 0000000..4b42fc5
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_install.txt
@@ -0,0 +1,53 @@
+# Regression test for 'go install' locations in GOPATH mode.
+env GO111MODULE=off
+[short] skip
+
+# Without $GOBIN set, binaries should be installed into the GOPATH bin directory.
+env GOBIN=
+rm $GOPATH/bin/go-cmd-test$GOEXE
+go install go-cmd-test
+exists $GOPATH/bin/go-cmd-test$GOEXE
+
+# With $GOBIN set, binaries should be installed to $GOBIN.
+env GOBIN=$WORK/bin1
+mkdir -p $GOBIN
+go install go-cmd-test
+exists $GOBIN/go-cmd-test$GOEXE
+
+# Issue 11065: installing to the current directory should create an executable.
+cd go-cmd-test
+env GOBIN=$PWD
+go install
+exists ./go-cmd-test$GOEXE
+cd ..
+
+# Without $GOBIN set, installing a program outside $GOPATH should fail
+# (there is nowhere to install it).
+env GOPATH= # reset to default ($HOME/go, which does not exist)
+env GOBIN=
+! go install go-cmd-test/helloworld.go
+stderr '^go install: no install location for \.go files listed on command line \(GOBIN not set\)$'
+
+# With $GOBIN set, should install there.
+env GOBIN=$WORK/bin1
+go install go-cmd-test/helloworld.go
+exists $GOBIN/helloworld$GOEXE
+
+# We can't assume that we can write to GOROOT, because it may not be writable.
+# However, we can check its install location using 'go list'.
+# cmd/fix should be installed to GOROOT/pkg, not GOPATH/bin.
+env GOPATH=$PWD
+go list -f '{{.Target}}' cmd/fix
+stdout $GOROOT'[/\\]pkg[/\\]tool[/\\]'$GOOS'_'$GOARCH'[/\\]fix'$GOEXE'$'
+
+# GOBIN should not affect toolchain install locations.
+env GOBIN=$WORK/bin1
+go list -f '{{.Target}}' cmd/fix
+stdout $GOROOT'[/\\]pkg[/\\]tool[/\\]'$GOOS'_'$GOARCH'[/\\]fix'$GOEXE'$'
+
+-- go-cmd-test/helloworld.go --
+package main
+
+func main() {
+	println("hello world")
+}
diff --git a/src/cmd/go/testdata/script/gopath_local.txt b/src/cmd/go/testdata/script/gopath_local.txt
new file mode 100644
index 0000000..7ee1f83
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_local.txt
@@ -0,0 +1,117 @@
+env GO111MODULE=off  # Relative imports only work in GOPATH mode.
+
+[short] skip
+
+# Imports should be resolved relative to the source file.
+go build testdata/local/easy.go
+exec ./easy$GOEXE
+stdout '^easysub\.Hello'
+
+# Ignored files should be able to import the package built from
+# non-ignored files in the same directory.
+go build -o easysub$GOEXE testdata/local/easysub/main.go
+exec ./easysub$GOEXE
+stdout '^easysub\.Hello'
+
+# Files in relative-imported packages should be able to
+# use relative imports themselves.
+go build testdata/local/hard.go
+exec ./hard$GOEXE
+stdout '^sub\.Hello'
+
+# Explicit source files listed on the command line should not install without
+# GOBIN set, since individual source files aren't part of the containing GOPATH.
+! go install testdata/local/easy.go
+stderr '^go install: no install location for \.go files listed on command line \(GOBIN not set\)$'
+
+[windows] stop  # Windows does not allow the ridiculous directory name we're about to use.
+
+env BAD_DIR_NAME='#$%:, &()*;<=>?\^{}'
+
+mkdir -p testdata/$BAD_DIR_NAME/easysub
+mkdir -p testdata/$BAD_DIR_NAME/sub/sub
+
+cp testdata/local/easy.go testdata/$BAD_DIR_NAME/easy.go
+cp testdata/local/easysub/easysub.go testdata/$BAD_DIR_NAME/easysub/easysub.go
+cp testdata/local/easysub/main.go testdata/$BAD_DIR_NAME/easysub/main.go
+cp testdata/local/hard.go testdata/$BAD_DIR_NAME/hard.go
+cp testdata/local/sub/sub.go testdata/$BAD_DIR_NAME/sub/sub.go
+cp testdata/local/sub/sub/subsub.go testdata/$BAD_DIR_NAME/sub/sub/subsub.go
+
+# Imports should be resolved relative to the source file.
+go build testdata/$BAD_DIR_NAME/easy.go
+exec ./easy$GOEXE
+stdout '^easysub\.Hello'
+
+# Ignored files should be able to import the package built from
+# non-ignored files in the same directory.
+go build -o easysub$GOEXE testdata/$BAD_DIR_NAME/easysub/main.go
+exec ./easysub$GOEXE
+stdout '^easysub\.Hello'
+
+# Files in relative-imported packages should be able to
+# use relative imports themselves.
+go build testdata/$BAD_DIR_NAME/hard.go
+exec ./hard$GOEXE
+stdout '^sub\.Hello'
+
+# Explicit source files listed on the command line should not install without
+# GOBIN set, since individual source files aren't part of the containing GOPATH.
+! go install testdata/$BAD_DIR_NAME/easy.go
+stderr '^go install: no install location for \.go files listed on command line \(GOBIN not set\)$'
+
+-- testdata/local/easy.go --
+package main
+
+import "./easysub"
+
+func main() {
+	easysub.Hello()
+}
+-- testdata/local/easysub/easysub.go --
+package easysub
+
+import "fmt"
+
+func Hello() {
+	fmt.Println("easysub.Hello")
+}
+-- testdata/local/easysub/main.go --
+// +build ignore
+
+package main
+
+import "."
+
+func main() {
+	easysub.Hello()
+}
+-- testdata/local/hard.go --
+package main
+
+import "./sub"
+
+func main() {
+	sub.Hello()
+}
+-- testdata/local/sub/sub.go --
+package sub
+
+import (
+	"fmt"
+
+	subsub "./sub"
+)
+
+func Hello() {
+	fmt.Println("sub.Hello")
+	subsub.Hello()
+}
+-- testdata/local/sub/sub/subsub.go --
+package subsub
+
+import "fmt"
+
+func Hello() {
+	fmt.Println("subsub.Hello")
+}
diff --git a/src/cmd/go/testdata/script/gopath_moved_repo.txt b/src/cmd/go/testdata/script/gopath_moved_repo.txt
new file mode 100644
index 0000000..99d80bf
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_moved_repo.txt
@@ -0,0 +1,67 @@
+env GO111MODULE=off
+
+# Test that 'go get -u' reports packages whose VCS configurations do not
+# match their import paths.
+
+[!net] skip
+[short] skip
+
+# We need to execute a custom Go program to break the config files.
+#
+# git will ask for a username and password when we run 'go get -d -f -u',
+# so we also need to set GIT_ASKPASS. Conveniently, a single binary can
+# perform both tasks!
+
+go build -o replace.exe replace
+env GIT_ASKPASS=$PWD/replace.exe
+
+
+# Test that 'go get -u' reports moved git packages.
+
+[exec:git] go get -d rsc.io/pdf
+[exec:git] go get -d -u rsc.io/pdf
+[exec:git] exec ./replace.exe pdf rsc.io/pdf/.git/config
+
+[exec:git] ! go get -d -u rsc.io/pdf
+[exec:git] stderr 'is a custom import path for'
+[exec:git] ! go get -d -f -u rsc.io/pdf
+[exec:git] stderr 'validating server certificate|[nN]ot [fF]ound'
+
+
+# Test that 'go get -u' reports moved Mercurial packages.
+
+[exec:hg] go get -d vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] go get -d -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] exec ./replace.exe custom-hg-hello vcs-test.golang.org/go/custom-hg-hello/.hg/hgrc
+
+[exec:hg] ! go get -d -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] stderr 'is a custom import path for'
+[exec:hg] ! go get -d -f -u vcs-test.golang.org/go/custom-hg-hello
+[exec:hg] stderr 'validating server certificate|[nN]ot [fF]ound'
+
+
+-- replace/replace.go --
+package main
+
+import (
+	"bytes"
+	"log"
+	"os"
+)
+
+func main() {
+	if len(os.Args) < 3 {
+		return
+	}
+
+	base := []byte(os.Args[1])
+	path := os.Args[2]
+	data, err := os.ReadFile(path)
+	if err != nil {
+		log.Fatal(err)
+	}
+	err = os.WriteFile(path, bytes.ReplaceAll(data, base, append(base, "XXX"...)), 0644)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/src/cmd/go/testdata/script/gopath_paths.txt b/src/cmd/go/testdata/script/gopath_paths.txt
new file mode 100644
index 0000000..04265b1
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_paths.txt
@@ -0,0 +1,43 @@
+# Regression test for GOPATH validation in GOPATH mode.
+env GO111MODULE=off
+
+env ORIG_GOPATH=$GOPATH
+
+# The literal path '.' in GOPATH should be rejected.
+env GOPATH=.
+! go build go-cmd-test/helloworld.go
+stderr 'GOPATH entry is relative'
+
+# It should still be rejected if the requested package can be
+# found using another entry.
+env GOPATH=${:}$ORIG_GOPATH${:}.
+! go build go-cmd-test
+stderr 'GOPATH entry is relative'
+
+# GOPATH cannot be a relative subdirectory of the working directory.
+env ORIG_GOPATH
+stdout 'ORIG_GOPATH='$WORK[/\\]gopath
+cd $WORK
+env GOPATH=gopath
+! go build gopath/src/go-cmd-test/helloworld.go
+stderr 'GOPATH entry is relative'
+
+# Blank paths in GOPATH should be rejected as relative (issue 21928).
+env GOPATH=' '${:}$ORIG_GOPATH
+! go build go-cmd-test
+stderr 'GOPATH entry is relative'
+
+[short] stop
+
+# Empty paths in GOPATH should be ignored (issue 21928).
+env GOPATH=${:}$ORIG_GOPATH
+env GOPATH
+go install go-cmd-test
+exists $ORIG_GOPATH/bin/go-cmd-test$GOEXE
+
+-- go-cmd-test/helloworld.go --
+package main
+
+func main() {
+	println("hello world")
+}
diff --git a/src/cmd/go/testdata/script/gopath_std_vendor.txt b/src/cmd/go/testdata/script/gopath_std_vendor.txt
new file mode 100644
index 0000000..a0a41a5
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_std_vendor.txt
@@ -0,0 +1,44 @@
+env GO111MODULE=off
+
+[!gc] skip
+
+go list -f '{{.Dir}}' vendor/golang.org/x/net/http2/hpack
+stdout $GOPATH[/\\]src[/\\]vendor
+
+# A package importing 'net/http' should resolve its dependencies
+# to the package 'vendor/golang.org/x/net/http2/hpack' within GOROOT.
+cd importnethttp
+go list -deps -f '{{.ImportPath}} {{.Dir}}'
+stdout ^vendor/golang.org/x/net/http2/hpack
+stdout $GOROOT[/\\]src[/\\]vendor[/\\]golang.org[/\\]x[/\\]net[/\\]http2[/\\]hpack
+! stdout $GOPATH[/\\]src[/\\]vendor
+
+# In the presence of $GOPATH/src/vendor/golang.org/x/net/http2/hpack,
+# a package in GOPATH importing 'golang.org/x/net/http2/hpack' should
+# resolve its dependencies in GOPATH/src.
+cd ../issue16333
+go build .
+
+go list -deps -f '{{.ImportPath}} {{.Dir}}' .
+stdout $GOPATH[/\\]src[/\\]vendor[/\\]golang.org[/\\]x[/\\]net[/\\]http2[/\\]hpack
+! stdout $GOROOT[/\\]src[/\\]vendor
+
+go list -test -deps -f '{{.ImportPath}} {{.Dir}}' .
+stdout $GOPATH[/\\]src[/\\]vendor[/\\]golang.org[/\\]x[/\\]net[/\\]http2[/\\]hpack
+! stdout $GOROOT[/\\]src[/\\]vendor
+
+-- issue16333/issue16333.go --
+package vendoring17
+
+import _ "golang.org/x/net/http2/hpack"
+-- issue16333/issue16333_test.go --
+package vendoring17
+
+import _ "testing"
+import _ "golang.org/x/net/http2/hpack"
+-- importnethttp/http.go --
+package importnethttp
+
+import _ "net/http"
+-- $GOPATH/src/vendor/golang.org/x/net/http2/hpack/hpack.go --
+package hpack
diff --git a/src/cmd/go/testdata/script/gopath_vendor_dup_err.txt b/src/cmd/go/testdata/script/gopath_vendor_dup_err.txt
new file mode 100644
index 0000000..22e6048
--- /dev/null
+++ b/src/cmd/go/testdata/script/gopath_vendor_dup_err.txt
@@ -0,0 +1,25 @@
+[!net] skip
+env GO111MODULE=off
+
+# Issue 17119: Test more duplicate load errors.
+! go build dupload
+! stderr 'duplicate load|internal error'
+stderr 'dupload/vendor/p must be imported as p'
+
+-- dupload/dupload.go --
+package main
+
+import (
+	_ "dupload/p2"
+	_ "p"
+)
+
+func main() {}
+-- dupload/p/p.go --
+package p
+-- dupload/p2/p2.go --
+package p2
+
+import _ "dupload/vendor/p"
+-- dupload/vendor/p/p.go --
+package p
diff --git a/src/cmd/go/testdata/script/goroot_executable.txt b/src/cmd/go/testdata/script/goroot_executable.txt
new file mode 100644
index 0000000..fdbcde0
--- /dev/null
+++ b/src/cmd/go/testdata/script/goroot_executable.txt
@@ -0,0 +1,111 @@
+[gccgo] skip
+
+mkdir $WORK/new/bin
+
+# In this test, we are specifically checking the logic for deriving
+# the value of GOROOT from runtime.GOROOT.
+# GOROOT_FINAL changes the default behavior of runtime.GOROOT,
+# and will thus cause the test to fail if it is set when our
+# new cmd/go is built.
+env GOROOT_FINAL=
+
+go build -o $WORK/new/bin/go$GOEXE cmd/go &
+go build -o $WORK/bin/check$GOEXE check.go &
+wait
+
+env TESTGOROOT=$GOROOT
+env GOROOT=
+
+# Relocated Executable
+# cp $TESTGOROOT/bin/go$GOEXE $WORK/new/bin/go$GOEXE
+exec $WORK/bin/check$GOEXE $WORK/new/bin/go$GOEXE $TESTGOROOT
+
+# Relocated Tree:
+# If the binary is sitting in a bin dir next to ../pkg/tool, that counts as a GOROOT,
+# so it should find the new tree.
+mkdir $WORK/new/pkg/tool
+exec $WORK/bin/check$GOEXE $WORK/new/bin/go$GOEXE $WORK/new
+
+[!symlink] stop 'The rest of the test cases require symlinks'
+
+# Symlinked Executable:
+# With a symlink into go tree, we should still find the go tree.
+mkdir $WORK/other/bin
+symlink $WORK/other/bin/go$GOEXE -> $WORK/new/bin/go$GOEXE
+exec $WORK/bin/check$GOEXE $WORK/new/bin/go$GOEXE $WORK/new
+
+rm $WORK/new/pkg
+
+# Runtime GOROOT:
+# Binaries built in the new tree should report the
+# new tree when they call runtime.GOROOT.
+symlink $WORK/new/src -> $TESTGOROOT/src
+symlink $WORK/new/pkg -> $TESTGOROOT/pkg
+exec $WORK/new/bin/go$GOEXE run check_runtime_goroot.go $WORK/new
+
+-- check.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+func main() {
+	exe := os.Args[1]
+	want := os.Args[2]
+	cmd := exec.Command(exe, "env", "GOROOT")
+	out, err := cmd.CombinedOutput()
+	if err != nil {
+		fmt.Fprintf(os.Stderr, "%s env GOROOT: %v, %s\n", exe, err, out)
+		os.Exit(1)
+	}
+	goroot, err := filepath.EvalSymlinks(strings.TrimSpace(string(out)))
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	want, err = filepath.EvalSymlinks(want)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if !strings.EqualFold(goroot, want) {
+		fmt.Fprintf(os.Stderr, "go env GOROOT:\nhave %s\nwant %s\n", goroot, want)
+		os.Exit(1)
+	}
+	fmt.Fprintf(os.Stderr, "go env GOROOT: %s\n", goroot)
+
+}
+-- check_runtime_goroot.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"path/filepath"
+	"runtime"
+	"strings"
+)
+
+func main() {
+	goroot, err := filepath.EvalSymlinks(runtime.GOROOT())
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	want, err := filepath.EvalSymlinks(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if !strings.EqualFold(goroot, want) {
+		fmt.Fprintf(os.Stderr, "go env GOROOT:\nhave %s\nwant %s\n", goroot, want)
+		os.Exit(1)
+	}
+	fmt.Fprintf(os.Stderr, "go env GOROOT: %s\n", goroot)
+
+}
diff --git a/src/cmd/go/testdata/script/govcs.txt b/src/cmd/go/testdata/script/govcs.txt
new file mode 100644
index 0000000..4180d7d
--- /dev/null
+++ b/src/cmd/go/testdata/script/govcs.txt
@@ -0,0 +1,174 @@
+env GO111MODULE=on
+env proxy=$GOPROXY
+env GOPROXY=direct
+
+# GOVCS stops go get
+env GOVCS='*:none'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOPRIVATE='github.com/google'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# public pattern works
+env GOPRIVATE='github.com/google'
+env GOVCS='public:all,private:none'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# private pattern works
+env GOPRIVATE='hubgit.com/google'
+env GOVCS='private:all,public:none'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# other patterns work (for more patterns, see TestGOVCS)
+env GOPRIVATE=
+env GOVCS='github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOVCS='github.com/google/go-cmp/inner:git,github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^go get: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# bad patterns are reported (for more bad patterns, see TestGOVCSErrors)
+env GOVCS='git'
+! go get github.com/google/go-cmp
+stderr '^go get github.com/google/go-cmp: malformed entry in GOVCS \(missing colon\): "git"$'
+
+env GOVCS=github.com:hg,github.com:git
+! go get github.com/google/go-cmp
+stderr '^go get github.com/google/go-cmp: unreachable pattern in GOVCS: "github.com:git" after "github.com:hg"$'
+
+# bad GOVCS patterns do not stop commands that do not need to check VCS
+go list
+env GOPROXY=$proxy
+go get -d rsc.io/quote # ok because used proxy
+env GOPROXY=direct
+
+# svn is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.svn/hello
+stderr '^go get rsc.io/nonexist.svn/hello: GOVCS disallows using svn for public rsc.io/nonexist.svn; see ''go help vcs''$'
+
+# fossil is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.fossil/hello
+stderr '^go get rsc.io/nonexist.fossil/hello: GOVCS disallows using fossil for public rsc.io/nonexist.fossil; see ''go help vcs''$'
+
+# bzr is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.bzr/hello
+stderr '^go get rsc.io/nonexist.bzr/hello: GOVCS disallows using bzr for public rsc.io/nonexist.bzr; see ''go help vcs''$'
+
+# git is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[net] [exec:git] [!short] go get rsc.io/sampler
+
+# hg is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[net] [exec:hg] [!short] go get vcs-test.golang.org/go/custom-hg-hello
+
+# git can be disallowed
+env GOVCS=public:hg
+! go get rsc.io/nonexist.git/hello
+stderr '^go get rsc.io/nonexist.git/hello: GOVCS disallows using git for public rsc.io/nonexist.git; see ''go help vcs''$'
+
+# hg can be disallowed
+env GOVCS=public:git
+! go get rsc.io/nonexist.hg/hello
+stderr '^go get rsc.io/nonexist.hg/hello: GOVCS disallows using hg for public rsc.io/nonexist.hg; see ''go help vcs''$'
+
+# Repeat in GOPATH mode. Error texts slightly different.
+
+env GO111MODULE=off
+
+# GOVCS stops go get
+env GOVCS='*:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOPRIVATE='github.com/google'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# public pattern works
+env GOPRIVATE='github.com/google'
+env GOVCS='public:all,private:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for private github.com/google/go-cmp; see ''go help vcs''$'
+
+# private pattern works
+env GOPRIVATE='hubgit.com/google'
+env GOVCS='private:all,public:none'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# other patterns work (for more patterns, see TestGOVCS)
+env GOPRIVATE=
+env GOVCS='github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+env GOVCS='github.com/google/go-cmp/inner:git,github.com:svn|hg'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: GOVCS disallows using git for public github.com/google/go-cmp; see ''go help vcs''$'
+
+# bad patterns are reported (for more bad patterns, see TestGOVCSErrors)
+env GOVCS='git'
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: malformed entry in GOVCS \(missing colon\): "git"$'
+
+env GOVCS=github.com:hg,github.com:git
+! go get github.com/google/go-cmp
+stderr '^package github.com/google/go-cmp: unreachable pattern in GOVCS: "github.com:git" after "github.com:hg"$'
+
+# bad GOVCS patterns do not stop commands that do not need to check VCS
+go list
+
+# svn is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.svn/hello
+stderr '^package rsc.io/nonexist.svn/hello: GOVCS disallows using svn for public rsc.io/nonexist.svn; see ''go help vcs''$'
+
+# fossil is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.fossil/hello
+stderr '^package rsc.io/nonexist.fossil/hello: GOVCS disallows using fossil for public rsc.io/nonexist.fossil; see ''go help vcs''$'
+
+# bzr is disallowed by default
+env GOPRIVATE=
+env GOVCS=
+! go get rsc.io/nonexist.bzr/hello
+stderr '^package rsc.io/nonexist.bzr/hello: GOVCS disallows using bzr for public rsc.io/nonexist.bzr; see ''go help vcs''$'
+
+# git is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[net] [exec:git] [!short] go get rsc.io/sampler
+
+# hg is OK by default
+env GOVCS=
+env GONOSUMDB='*'
+[net] [exec:hg] [!short] go get vcs-test.golang.org/go/custom-hg-hello
+
+# git can be disallowed
+env GOVCS=public:hg
+! go get rsc.io/nonexist.git/hello
+stderr '^package rsc.io/nonexist.git/hello: GOVCS disallows using git for public rsc.io/nonexist.git; see ''go help vcs''$'
+
+# hg can be disallowed
+env GOVCS=public:git
+! go get rsc.io/nonexist.hg/hello
+stderr '^package rsc.io/nonexist.hg/hello: GOVCS disallows using hg for public rsc.io/nonexist.hg; see ''go help vcs''$'
+
+-- go.mod --
+module m
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/script/help.txt b/src/cmd/go/testdata/script/help.txt
new file mode 100644
index 0000000..26a0194
--- /dev/null
+++ b/src/cmd/go/testdata/script/help.txt
@@ -0,0 +1,51 @@
+env GO111MODULE=off
+
+# go help shows overview.
+go help
+stdout 'Go is a tool'
+stdout 'bug.*start a bug report'
+
+# go help bug shows usage for bug
+go help bug
+stdout 'usage: go bug'
+stdout 'bug report'
+
+# go bug help is an error (bug takes no arguments)
+! go bug help
+stderr 'bug takes no arguments'
+
+# go help mod shows mod subcommands
+go help mod
+stdout 'go mod <command>'
+stdout tidy
+
+# go help mod tidy explains tidy
+go help mod tidy
+stdout 'usage: go mod tidy'
+
+# go mod help tidy does too
+go mod help tidy
+stdout 'usage: go mod tidy'
+
+# go mod --help doesn't print help but at least suggests it.
+! go mod --help
+stderr 'Run ''go help mod'' for usage.'
+
+# Earlier versions of Go printed the same as 'go -h' here.
+# Also make sure we print the short help line.
+! go vet -h
+stderr 'usage: go vet .*'
+stderr 'Run ''go help vet'' for details.'
+stderr 'Run ''go tool vet help'' for a full list of flags and analyzers.'
+stderr 'Run ''go tool vet -help'' for an overview.'
+
+# Earlier versions of Go printed a large document here, instead of these two
+# lines.
+! go test -h
+stderr 'usage: go test'
+stderr 'Run ''go help test'' and ''go help testflag'' for details.'
+
+# go help get shows usage for get
+go help get
+stdout 'usage: go get'
+stdout 'get when using GOPATH'
diff --git a/src/cmd/go/testdata/script/import_cycle.txt b/src/cmd/go/testdata/script/import_cycle.txt
new file mode 100644
index 0000000..901f43c
--- /dev/null
+++ b/src/cmd/go/testdata/script/import_cycle.txt
@@ -0,0 +1,12 @@
+env GO111MODULE=off
+
+! go build selfimport
+stderr -count=1 'import cycle not allowed'
+
+# 'go list' shouldn't hang forever.
+go list -e -json selfimport
+
+-- $GOPATH/src/selfimport/selfimport.go --
+package selfimport
+
+import "selfimport"
diff --git a/src/cmd/go/testdata/script/import_ignore.txt b/src/cmd/go/testdata/script/import_ignore.txt
new file mode 100644
index 0000000..83a39a0
--- /dev/null
+++ b/src/cmd/go/testdata/script/import_ignore.txt
@@ -0,0 +1,11 @@
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod go.mod.orig
+
+-- go.mod --
+module m.test
+
+go 1.16
+-- .ignore.go --
+package p
+import _ "golang.org/x/mod/modfile"
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/import_main.txt b/src/cmd/go/testdata/script/import_main.txt
new file mode 100644
index 0000000..bc2cc4d
--- /dev/null
+++ b/src/cmd/go/testdata/script/import_main.txt
@@ -0,0 +1,114 @@
+env GO111MODULE=off
+
+# Test that you cannot import a main package.
+# See golang.org/issue/4210 and golang.org/issue/17475.
+
+[short] skip
+cd $WORK
+
+# Importing package main from that package main's test should work.
+go build x
+go test -c x
+
+# Importing package main from another package should fail.
+! go build p1
+stderr 'import "x" is a program, not an importable package'
+
+# ... even in that package's test.
+go build p2
+! go test -c p2
+stderr 'import "x" is a program, not an importable package'
+
+# ... even if that package's test is an xtest.
+go build p3
+! go test p3
+stderr 'import "x" is a program, not an importable package'
+
+# ... even if that package is a package main
+go build p4
+! go test -c p4
+stderr 'import "x" is a program, not an importable package'
+
+# ... even if that package is a package main using an xtest.
+go build p5
+! go test -c p5
+stderr 'import "x" is a program, not an importable package'
+
+-- x/main.go --
+package main
+
+var X int
+
+func main() {}
+-- x/main_test.go --
+package main_test
+
+import (
+	"testing"
+	xmain "x"
+)
+
+var _ = xmain.X
+
+func TestFoo(t *testing.T) {}
+-- p1/p.go --
+package p1
+
+import xmain "x"
+
+var _ = xmain.X
+-- p2/p.go --
+package p2
+-- p2/p_test.go --
+package p2
+
+import (
+	"testing"
+	xmain "x"
+)
+
+var _ = xmain.X
+
+func TestFoo(t *testing.T) {}
+-- p3/p.go --
+package p
+-- p3/p_test.go --
+package p_test
+
+import (
+	"testing"
+	xmain "x"
+)
+
+var _ = xmain.X
+
+func TestFoo(t *testing.T) {}
+-- p4/p.go --
+package main
+
+func main() {}
+-- p4/p_test.go --
+package main
+
+import (
+	"testing"
+	xmain "x"
+)
+
+var _ = xmain.X
+
+func TestFoo(t *testing.T) {}
+-- p5/p.go --
+package main
+func main() {}
+-- p5/p_test.go --
+package main_test
+
+import (
+	"testing"
+	xmain "x"
+)
+
+var _ = xmain.X
+
+func TestFoo(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/install_cgo_excluded.txt b/src/cmd/go/testdata/script/install_cgo_excluded.txt
new file mode 100644
index 0000000..5a2b460
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_cgo_excluded.txt
@@ -0,0 +1,15 @@
+env CGO_ENABLED=0
+
+! go install cgotest
+stderr 'build constraints exclude all Go files'
+
+-- go.mod --
+module cgotest
+
+go 1.16
+-- m.go --
+package cgotest
+
+import "C"
+
+var _ C.int
diff --git a/src/cmd/go/testdata/script/install_cleans_build.txt b/src/cmd/go/testdata/script/install_cleans_build.txt
new file mode 100644
index 0000000..dc85eb8
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_cleans_build.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+[short] skip
+
+# 'go install' with no arguments should clean up after go build
+cd mycmd
+go build
+exists mycmd$GOEXE
+go install
+! exists mycmd$GOEXE
+
+# 'go install mycmd' does not clean up, even in the mycmd directory
+go build
+exists mycmd$GOEXE
+go install mycmd
+exists mycmd$GOEXE
+
+# 'go install mycmd' should not clean up in an unrelated current directory either
+cd ..
+cp mycmd/mycmd$GOEXE mycmd$GOEXE
+go install mycmd
+exists mycmd$GOEXE
+
+-- mycmd/main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/install_cmd_gobin.txt b/src/cmd/go/testdata/script/install_cmd_gobin.txt
new file mode 100644
index 0000000..38fd66c
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_cmd_gobin.txt
@@ -0,0 +1,10 @@
+# Check that commands in cmd are install to $GOROOT/bin, not $GOBIN.
+# Verifies golang.org/issue/32674.
+env GOBIN=gobin
+mkdir gobin
+go list -f '{{.Target}}' cmd/go
+stdout $GOROOT[/\\]bin[/\\]go$GOEXE
+
+# Check that tools are installed to $GOTOOLDIR, not $GOBIN.
+go list -f '{{.Target}}' cmd/compile
+stdout $GOROOT[/\\]pkg[/\\]tool[/\\]${GOOS}_${GOARCH}[/\\]compile$GOEXE
diff --git a/src/cmd/go/testdata/script/install_cross_gobin.txt b/src/cmd/go/testdata/script/install_cross_gobin.txt
new file mode 100644
index 0000000..33d48fc
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_cross_gobin.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+[short] skip # rebuilds std for alternate architecture
+
+cd mycmd
+go build mycmd
+
+# cross-compile install with implicit GOBIN=$GOPATH/bin can make subdirectory
+env GOARCH=386
+[386] env GOARCH=amd64
+env GOOS=linux
+go install mycmd
+exists $GOPATH/bin/linux_$GOARCH/mycmd
+
+# cross-compile install with explicit GOBIN cannot make subdirectory
+env GOBIN=$WORK/bin
+! go install mycmd
+! exists $GOBIN/linux_$GOARCH
+
+# The install directory for a cross-compiled standard command should include GOARCH.
+go list -f '{{.Target}}'  cmd/pack
+stdout ${GOROOT}[/\\]pkg[/\\]tool[/\\]${GOOS}_${GOARCH}[/\\]pack$
+
+-- mycmd/x.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/install_msan_and_race_require_cgo.txt b/src/cmd/go/testdata/script/install_msan_and_race_require_cgo.txt
new file mode 100644
index 0000000..7985cd2
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_msan_and_race_require_cgo.txt
@@ -0,0 +1,18 @@
+# Tests Issue #21895
+
+[!msan] [!race] skip 'skipping because both msan and the race detector are not supported'
+
+env CGO_ENABLED=0
+
+[race] ! go install -race triv.go
+[race] stderr '-race requires cgo'
+[race] ! stderr '-msan'
+
+[msan] ! go install -msan triv.go
+[msan] stderr '-msan requires cgo'
+[msan] ! stderr '-race'
+
+-- triv.go --
+package main
+
+func main() {}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/install_rebuild_gopath.txt b/src/cmd/go/testdata/script/install_rebuild_gopath.txt
new file mode 100644
index 0000000..14a6c86
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_rebuild_gopath.txt
@@ -0,0 +1,30 @@
+env GO111MODULE=off
+
+# GOPATH with p1 in d1, p2 in d2
+env GOPATH=$WORK/d1${:}$WORK/d2
+
+# build & install p1
+go install -i p1
+! stale p1 p2
+
+# modify p2 - p1 should appear stale
+cp $WORK/p2x.go $WORK/d2/src/p2/p2.go
+stale p1 p2
+
+# build & install p1 again
+go install -i p1
+! stale p1 p2
+
+-- $WORK/d1/src/p1/p1.go --
+package p1
+import "p2"
+func F() { p2.F() }
+
+-- $WORK/d2/src/p2/p2.go --
+package p2
+func F() {}
+
+-- $WORK/p2x.go --
+package p2
+func F() {}
+func G() {}
diff --git a/src/cmd/go/testdata/script/install_rebuild_removed.txt b/src/cmd/go/testdata/script/install_rebuild_removed.txt
new file mode 100644
index 0000000..5db3778
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_rebuild_removed.txt
@@ -0,0 +1,44 @@
+env GO111MODULE=off
+
+# go command should detect package staleness as source file set changes
+go install mypkg
+! stale mypkg
+
+# z.go was not compiled; removing it should NOT make mypkg stale
+rm mypkg/z.go
+! stale mypkg
+
+# y.go was compiled; removing it should make mypkg stale
+rm mypkg/y.go
+stale mypkg
+
+# go command should detect executable staleness too
+go install mycmd
+! stale mycmd
+rm mycmd/z.go
+! stale mycmd
+rm mycmd/y.go
+stale mycmd
+
+-- mypkg/x.go --
+package mypkg
+
+-- mypkg/y.go --
+package mypkg
+
+-- mypkg/z.go --
+// +build missingtag
+
+package mypkg
+
+-- mycmd/x.go --
+package main
+func main() {}
+
+-- mycmd/y.go --
+package main
+
+-- mycmd/z.go --
+// +build missingtag
+
+package main
diff --git a/src/cmd/go/testdata/script/install_relative_gobin_fail.txt b/src/cmd/go/testdata/script/install_relative_gobin_fail.txt
new file mode 100644
index 0000000..aa14524
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_relative_gobin_fail.txt
@@ -0,0 +1,12 @@
+env GOBIN=.
+! go install
+stderr 'cannot install, GOBIN must be an absolute path'
+
+-- go.mod --
+module triv
+
+go 1.16
+-- triv.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/install_shadow_gopath.txt b/src/cmd/go/testdata/script/install_shadow_gopath.txt
new file mode 100644
index 0000000..2039d9e
--- /dev/null
+++ b/src/cmd/go/testdata/script/install_shadow_gopath.txt
@@ -0,0 +1,20 @@
+# Tests Issue #3562
+# go get foo.io (not foo.io/subdir) was not working consistently.
+
+[!net] skip
+
+env GO111MODULE=off
+env GOPATH=$WORK/gopath1${:}$WORK/gopath2
+
+mkdir $WORK/gopath1/src/test
+mkdir $WORK/gopath2/src/test
+cp main.go $WORK/gopath2/src/test/main.go
+cd $WORK/gopath2/src/test
+
+! go install
+stderr 'no install location for.*gopath2.src.test: hidden by .*gopath1.src.test'
+
+-- main.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/issue36000.txt b/src/cmd/go/testdata/script/issue36000.txt
new file mode 100644
index 0000000..4173275
--- /dev/null
+++ b/src/cmd/go/testdata/script/issue36000.txt
@@ -0,0 +1,6 @@
+# Tests golang.org/issue/36000
+
+[!cgo] skip
+
+# go env with CGO flags should not make NUL file
+go env CGO_CFLAGS
diff --git a/src/cmd/go/testdata/script/ldflag.txt b/src/cmd/go/testdata/script/ldflag.txt
new file mode 100644
index 0000000..6ceb33b
--- /dev/null
+++ b/src/cmd/go/testdata/script/ldflag.txt
@@ -0,0 +1,44 @@
+# Issue #42565
+
+[!cgo] skip
+
+# We can't build package bad, which uses #cgo LDFLAGS.
+cd bad
+! go build
+stderr no-such-warning
+
+# We can build package ok with the same flags in CGO_LDFLAGS.
+env CGO_LDFLAGS=-Wno-such-warning -Wno-unknown-warning-option
+cd ../ok
+go build
+
+# Build a main program that actually uses LDFLAGS.
+cd ..
+go build -ldflags=-v
+
+# Because we passed -v the Go linker should print the external linker
+# command which should include the flag we passed in CGO_LDFLAGS.
+stderr no-such-warning
+
+-- go.mod --
+module ldflag
+
+-- bad/bad.go --
+package bad
+
+// #cgo LDFLAGS: -Wno-such-warning -Wno-unknown-warning
+import "C"
+
+func F() {}
+-- ok/ok.go --
+package ok
+
+import "C"
+
+func F() {}
+-- main.go --
+package main
+
+import _ "ldflag/ok"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/link_matching_actionid.txt b/src/cmd/go/testdata/script/link_matching_actionid.txt
new file mode 100644
index 0000000..b8d423d
--- /dev/null
+++ b/src/cmd/go/testdata/script/link_matching_actionid.txt
@@ -0,0 +1,38 @@
+# Checks that an identical binary is built with -trimpath from the same
+# source files, with GOROOT in two different locations.
+# Verifies golang.org/issue/38989
+
+[short] skip
+[!symlink] skip
+
+# Symlink the compiler to a local path
+env GOROOT=$WORK/goroot1
+symlink $GOROOT -> $TESTGO_GOROOT
+
+# Set up fresh GOCACHE
+env GOCACHE=$WORK/gocache1
+mkdir $GOCACHE
+
+# Build a simple binary
+go build -o binary1 -trimpath -x main.go
+
+# Now repeat the same process with the compiler at a different local path
+env GOROOT=$WORK/goroot2
+symlink $GOROOT -> $TESTGO_GOROOT
+
+env GOCACHE=$WORK/gocache2
+mkdir $GOCACHE
+
+go build -o binary2 -trimpath -x main.go
+
+# Check that the binaries match exactly
+go tool buildid binary1
+cp stdout buildid1
+go tool buildid binary2
+cp stdout buildid2
+cmp buildid1 buildid2
+
+
+-- main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/link_syso_issue33139.txt b/src/cmd/go/testdata/script/link_syso_issue33139.txt
new file mode 100644
index 0000000..8a8cb4a
--- /dev/null
+++ b/src/cmd/go/testdata/script/link_syso_issue33139.txt
@@ -0,0 +1,43 @@
+# Test that we can use the external linker with a host syso file that is
+# embedded in a package, that is referenced by a Go assembly function.
+# See issue 33139.
+[!gc] skip
+[!cgo] skip
+
+# External linking is not supported on linux/ppc64.
+# See: https://github.com/golang/go/issues/8912
+[linux] [ppc64] skip
+
+cc -c -o syso/objTestImpl.syso syso/src/objTestImpl.c
+go build -ldflags='-linkmode=external' ./cmd/main.go
+
+-- go.mod --
+module m
+
+go 1.16
+-- syso/objTest.s --
+#include "textflag.h"
+
+TEXT ·ObjTest(SB), NOSPLIT, $0
+	// We do not actually execute this function in the test above, thus
+	// there is no stack frame setup here.
+	// We only care about Go build and/or link errors when referencing
+	// the objTestImpl symbol in the syso file.
+	JMP objTestImpl(SB)
+
+-- syso/pkg.go --
+package syso
+
+func ObjTest()
+
+-- syso/src/objTestImpl.c --
+void objTestImpl() { /* Empty */ }
+
+-- cmd/main.go --
+package main
+
+import "m/syso"
+
+func main() {
+	syso.ObjTest()
+}
diff --git a/src/cmd/go/testdata/script/linkname.txt b/src/cmd/go/testdata/script/linkname.txt
new file mode 100644
index 0000000..1133659
--- /dev/null
+++ b/src/cmd/go/testdata/script/linkname.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=off
+
+# check for linker name in error message about linker crash
+[!gc] skip
+! go build -ldflags=-crash_for_testing x.go
+stderr [\\/]tool[\\/].*[\\/]link
+
+-- x.go --
+package main; func main() {}
diff --git a/src/cmd/go/testdata/script/list_ambiguous_path.txt b/src/cmd/go/testdata/script/list_ambiguous_path.txt
new file mode 100644
index 0000000..82dde45
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_ambiguous_path.txt
@@ -0,0 +1,38 @@
+# Ensures that we can correctly list package patterns ending in '.go'.
+# See golang.org/issue/34653.
+
+# A single pattern for a package ending in '.go'.
+go list ./foo.go
+stdout '^test/foo.go$'
+
+# Multiple patterns for packages including one ending in '.go'.
+go list ./bar ./foo.go
+stdout '^test/bar$'
+stdout '^test/foo.go$'
+
+# A single pattern for a Go file.
+go list ./a.go
+stdout '^command-line-arguments$'
+
+# A single typo-ed pattern for a Go file. This should
+# treat the wrong pattern as if it were a package.
+! go list ./foo.go/b.go
+stderr '^stat .*[/\\]foo\.go[/\\]b\.go: directory not found$'
+
+# Multiple patterns for Go files with a typo. This should
+# treat the wrong pattern as if it were a nonexistent file.
+! go list ./foo.go/a.go ./foo.go/b.go
+[plan9] stderr 'stat ./foo.go/b.go: ''./foo.go/b.go'' does not exist'
+[windows] stderr './foo.go/b.go: The system cannot find the file specified'
+[!plan9] [!windows] stderr './foo.go/b.go: no such file or directory'
+
+-- a.go --
+package main
+-- bar/a.go --
+package bar
+-- foo.go/a.go --
+package foo.go
+-- go.mod --
+module "test"
+
+go 1.13
diff --git a/src/cmd/go/testdata/script/list_bad_import.txt b/src/cmd/go/testdata/script/list_bad_import.txt
new file mode 100644
index 0000000..dbec350
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_bad_import.txt
@@ -0,0 +1,72 @@
+env GO111MODULE=off
+[short] skip
+
+# This test matches mod_list_bad_import, but in GOPATH mode.
+# Please keep them in sync.
+
+env GO111MODULE=off
+cd example.com
+
+# Without -e, listing an otherwise-valid package with an unsatisfied direct import should fail.
+# BUG: Today it succeeds.
+go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}} {{range .DepsErrors}}bad dep: {{.Err}}{{end}}' example.com/direct
+! stdout ^error
+stdout 'incomplete'
+stdout 'bad dep: .*example.com[/\\]notfound'
+
+# Listing with -deps should also fail.
+! go list -deps example.com/direct
+stderr example.com[/\\]notfound
+
+# But -e -deps should succeed.
+go list -e -deps example.com/direct
+stdout example.com/notfound
+
+
+# Listing an otherwise-valid package that imports some *other* package with an
+# unsatisfied import should also fail.
+# BUG: Today, it succeeds.
+go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}} {{range .DepsErrors}}bad dep: {{.Err}}{{end}}' example.com/indirect
+! stdout ^error
+stdout incomplete
+stdout 'bad dep: .*example.com[/\\]notfound'
+
+# Again, -deps should fail.
+! go list -deps example.com/indirect
+stderr example.com[/\\]notfound
+
+# But -deps -e should succeed.
+go list -e -deps example.com/indirect
+stdout example.com/notfound
+
+
+# Listing the missing dependency directly should fail outright...
+! go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}}' example.com/notfound
+stderr 'no Go files in .*example.com[/\\]notfound'
+! stdout error
+! stdout incomplete
+
+# ...but listing with -e should succeed.
+go list -e -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}}' example.com/notfound
+stdout error
+stdout incomplete
+
+
+# The pattern "all" should match only packages that actually exist,
+# ignoring those whose existence is merely implied by imports.
+go list -e -f '{{.ImportPath}}' all
+stdout example.com/direct
+stdout example.com/indirect
+! stdout example.com/notfound
+
+
+-- example.com/direct/direct.go --
+package direct
+import _ "example.com/notfound"
+
+-- example.com/indirect/indirect.go --
+package indirect
+import _ "example.com/direct"
+
+-- example.com/notfound/README --
+This directory intentionally left blank.
diff --git a/src/cmd/go/testdata/script/list_case_collision.txt b/src/cmd/go/testdata/script/list_case_collision.txt
new file mode 100644
index 0000000..181a202
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_case_collision.txt
@@ -0,0 +1,41 @@
+# Tests golang.org/issue/4773
+
+go list -json example/a
+stdout 'case-insensitive import collision'
+
+! go build example/a
+stderr 'case-insensitive import collision'
+
+# List files explicitly on command line, to encounter case-checking
+# logic even on case-insensitive filesystems.
+cp b/file.go b/FILE.go  # no-op on case-insensitive filesystems
+! go list b/file.go b/FILE.go
+stderr 'case-insensitive file name collision'
+
+mkdir a/Pkg  # no-op on case-insensitive filesystems
+cp a/pkg/pkg.go a/Pkg/pkg.go  # no-op on case-insensitive filesystems
+! go list example/a/pkg example/a/Pkg
+
+# Test that the path reported with an indirect import is correct.
+cp b/file.go b/FILE.go
+[case-sensitive] ! go build example/c
+[case-sensitive] stderr '^package example/c\n\timports example/b: case-insensitive file name collision: "FILE.go" and "file.go"$'
+
+-- go.mod --
+module example
+
+go 1.16
+-- a/a.go --
+package p
+import (
+	_ "example/a/pkg"
+	_ "example/a/Pkg"
+)
+-- a/pkg/pkg.go --
+package pkg
+-- b/file.go --
+package b
+-- c/c.go --
+package c
+
+import _ "example/b"
diff --git a/src/cmd/go/testdata/script/list_compiled_imports.txt b/src/cmd/go/testdata/script/list_compiled_imports.txt
new file mode 100644
index 0000000..7780b07
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_compiled_imports.txt
@@ -0,0 +1,31 @@
+env GO111MODULE=off
+
+[!cgo] skip
+
+# go list should report import "C"
+cd x
+go list -f '{{.Imports}}'
+! stdout runtime/cgo
+! stdout unsafe
+! stdout syscall
+stdout C
+stdout unicode
+stdout unicode/utf16
+
+# go list -compiled should report imports in compiled files as well,
+# adding "runtime/cgo", "unsafe", and "syscall" but not dropping "C".
+go list -compiled -f '{{.Imports}}'
+stdout runtime/cgo
+stdout unsafe
+stdout syscall
+stdout C
+stdout unicode
+stdout unicode/utf16
+
+-- x/x.go --
+package x
+import "C"
+import "unicode" // does not use unsafe, syscall, runtime/cgo, unicode/utf16
+-- x/x1.go --
+package x
+import "unicode/utf16" // does not use unsafe, syscall, runtime/cgo, unicode
diff --git a/src/cmd/go/testdata/script/list_constraints.txt b/src/cmd/go/testdata/script/list_constraints.txt
new file mode 100644
index 0000000..7115c36
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_constraints.txt
@@ -0,0 +1,86 @@
+# Check that files and their imports are not included in 'go list' output
+# when they are excluded by build constraints.
+
+# Linux and cgo files should be included when building in that configuration.
+env GOOS=linux
+env GOARCH=amd64
+env CGO_ENABLED=1
+go list -f '{{range .GoFiles}}{{.}} {{end}}'
+stdout '^cgotag.go empty.go suffix_linux.go tag.go $'
+go list -f '{{range .CgoFiles}}{{.}} {{end}}'
+stdout '^cgoimport.go $'
+go list -f '{{range .Imports}}{{.}} {{end}}'
+stdout '^C cgoimport cgotag suffix tag $'
+
+# Disabling cgo should exclude cgo files and their imports.
+env CGO_ENABLED=0
+go list -f '{{range .GoFiles}}{{.}} {{end}}'
+stdout 'empty.go suffix_linux.go tag.go'
+go list -f '{{range .CgoFiles}}{{.}} {{end}}'
+! stdout .
+go list -f '{{range .Imports}}{{.}} {{end}}'
+stdout '^suffix tag $'
+
+# Changing OS should exclude linux sources.
+env GOOS=darwin
+go list -f '{{range .GoFiles}}{{.}} {{end}}'
+stdout '^empty.go $'
+go list -f '{{range .Imports}}{{.}} {{end}}'
+stdout '^$'
+
+# Enabling a tag should include files that require it.
+go list -tags=extra -f '{{range .GoFiles}}{{.}} {{end}}'
+stdout '^empty.go extra.go $'
+go list -tags=extra -f '{{range .Imports}}{{.}} {{end}}'
+stdout '^extra $'
+
+# Packages that require a tag should not be listed unless the tag is on.
+! go list ./tagonly
+go list -tags=extra ./tagonly
+stdout m/tagonly
+
+-- go.mod --
+module m
+
+go 1.13
+
+-- empty.go --
+package p
+
+-- extra.go --
+// +build extra
+
+package p
+
+import _ "extra"
+
+-- suffix_linux.go --
+package p
+
+import _ "suffix"
+
+-- tag.go --
+// +build linux
+
+package p
+
+import _ "tag"
+
+-- cgotag.go --
+// +build cgo
+
+package p
+
+import _ "cgotag"
+
+-- cgoimport.go --
+package p
+
+import "C"
+
+import _ "cgoimport"
+
+-- tagonly/tagonly.go --
+// +build extra
+
+package tagonly
diff --git a/src/cmd/go/testdata/script/list_dedup_packages.txt b/src/cmd/go/testdata/script/list_dedup_packages.txt
new file mode 100644
index 0000000..30c68dd
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_dedup_packages.txt
@@ -0,0 +1,31 @@
+# Setup
+env GO111MODULE=off
+mkdir $WORK/tmp/testdata/src/xtestonly
+cp f.go $WORK/tmp/testdata/src/xtestonly/f.go
+cp f_test.go $WORK/tmp/testdata/src/xtestonly/f_test.go
+env GOPATH=$WORK/tmp/testdata
+cd $WORK
+
+# Check output of go list to ensure no duplicates
+go list xtestonly ./tmp/testdata/src/xtestonly/...
+cmp stdout $WORK/gopath/src/wantstdout
+
+-- wantstdout --
+xtestonly
+-- f.go --
+package xtestonly
+
+func F() int { return 42 }
+-- f_test.go --
+package xtestonly_test
+
+import (
+	"testing"
+	"xtestonly"
+)
+
+func TestF(t *testing.T) {
+	if x := xtestonly.F(); x != 42 {
+		t.Errorf("f.F() = %d, want 42", x)
+	}
+}
diff --git a/src/cmd/go/testdata/script/list_err_cycle.txt b/src/cmd/go/testdata/script/list_err_cycle.txt
new file mode 100644
index 0000000..44b82a6
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_err_cycle.txt
@@ -0,0 +1,15 @@
+# Check that we don't get infinite recursion when loading a package with
+# an import cycle and another error. Verifies #25830.
+! go list
+stderr 'found packages a \(a.go\) and b \(b.go\)'
+
+-- go.mod --
+module errcycle
+
+go 1.16
+-- a.go --
+package a
+
+import _ "errcycle"
+-- b.go --
+package b
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/list_err_stack.txt b/src/cmd/go/testdata/script/list_err_stack.txt
new file mode 100644
index 0000000..a7be9fd
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_err_stack.txt
@@ -0,0 +1,27 @@
+
+# golang.org/issue/40544: regression in error stacks for parse errors
+
+env GO111MODULE=off
+cd sandbox/foo
+go list -e -json .
+stdout '"sandbox/foo"'
+stdout '"sandbox/bar"'
+stdout '"Pos": "..(/|\\\\)bar(/|\\\\)bar.go:1:1"'
+stdout '"Err": "expected ''package'', found ackage"'
+
+env GO111MODULE=on
+go list -e -json .
+stdout '"sandbox/foo"'
+stdout '"sandbox/bar"'
+stdout '"Pos": "..(/|\\\\)bar(/|\\\\)bar.go:1:1"'
+stdout '"Err": "expected ''package'', found ackage"'
+
+-- sandbox/go.mod --
+module sandbox
+
+-- sandbox/foo/foo.go --
+package pkg
+
+import "sandbox/bar"
+-- sandbox/bar/bar.go --
+ackage bar
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/list_find.txt b/src/cmd/go/testdata/script/list_find.txt
new file mode 100644
index 0000000..d450fc9
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_find.txt
@@ -0,0 +1,22 @@
+env GO111MODULE=off
+
+# go list -find should not report imports
+
+go list -f {{.Incomplete}} x/y/z...  # should probably exit non-zero but never has
+stdout true
+go list -find -f '{{.Incomplete}} {{.Imports}}' x/y/z...
+stdout '^false \[\]'
+
+# go list -find -compiled should use cached sources the second time it's run.
+# It might not find the same cached sources as "go build", but the sources
+# should be identical. "go build" derives action IDs (which are used as cache
+# keys) from dependencies' action IDs. "go list -find" won't know what the
+# dependencies are, so it's can't construct the same action IDs.
+[short] skip
+go list -find -compiled net
+go list -find -compiled -x net
+! stderr 'cgo'
+
+-- x/y/z/z.go --
+package z
+import "does/not/exist"
diff --git a/src/cmd/go/testdata/script/list_gofile_in_goroot.txt b/src/cmd/go/testdata/script/list_gofile_in_goroot.txt
new file mode 100644
index 0000000..6e48d7b
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_gofile_in_goroot.txt
@@ -0,0 +1,76 @@
+# Return an error if the user tries to list a go source file directly in $GOROOT/src.
+# Tests golang.org/issue/36587
+
+env GOROOT=$WORK/goroot
+env GOPATH=$WORK/gopath
+
+go env GOROOT
+stdout $WORK[/\\]goroot
+
+# switch to GOROOT/src
+cd $GOROOT/src
+
+# In module mode, 'go list ./...' should not treat .go files in GOROOT/src as an
+# importable package, since that directory has no valid import path.
+env GO111MODULE=on
+go list ...
+stdout -count=1 '^.+$'
+stdout '^fmt$'
+! stdout foo
+
+go list ./...
+stdout -count=1 '^.+$'
+stdout '^fmt$'
+! stdout foo
+
+go list std
+stdout -count=1 '^.+$'
+stdout '^fmt$'
+
+! go list .
+stderr '^GOROOT/src is not an importable package$'
+
+# In GOPATH mode, 'go list ./...' should synthesize a legacy GOPATH-mode path —
+# not a standard-library or empty path — for the errant package.
+env GO111MODULE=off
+go list ./...
+stdout -count=2 '^.+$' # Both 'fmt' and GOROOT/src should be listed.
+stdout '^fmt$'
+[!windows] stdout ^_$WORK/goroot/src$
+[windows] stdout goroot/src$ # On windows the ":" in the volume name is mangled
+
+go list ...
+! stdout goroot/src
+
+go list std
+! stdout goroot/src
+
+go list .
+[!windows] stdout ^_$WORK/goroot/src$
+[windows] stdout goroot/src$
+
+# switch to GOPATH/src
+cd $GOPATH/src
+
+# GO111MODULE=off,GOPATH
+env GO111MODULE=off
+go list ./...
+[!windows] stdout ^_$WORK/gopath/src$
+[windows] stdout gopath/src$
+
+go list all
+! stdout gopath/src
+
+-- $WORK/goroot/src/go.mod --
+module std
+
+go 1.14
+-- $WORK/goroot/src/foo.go --
+package foo
+-- $WORK/goroot/src/fmt/fmt.go --
+package fmt
+-- $WORK/goroot/src/cmd/README --
+This directory must exist in order for the 'cmd' pattern to have something to
+match against.
+-- $GOPATH/src/foo.go --
+package foo
diff --git a/src/cmd/go/testdata/script/list_importmap.txt b/src/cmd/go/testdata/script/list_importmap.txt
new file mode 100644
index 0000000..f424b98
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_importmap.txt
@@ -0,0 +1,27 @@
+env GO111MODULE=off
+
+# gccgo does not have standard packages.
+[gccgo] skip
+
+# fmt should have no rewritten imports.
+# The import from a/b should map c/d to a's vendor directory.
+go list -f '{{.ImportPath}}: {{.ImportMap}}' fmt a/b
+stdout 'fmt: map\[\]'
+stdout 'a/b: map\[c/d:a/vendor/c/d\]'
+
+# flag [fmt.test] should import fmt [fmt.test] as fmt
+# fmt.test should import testing [fmt.test] as testing
+# fmt.test should not import a modified os
+go list -deps -test -f '{{.ImportPath}} MAP: {{.ImportMap}}{{"\n"}}{{.ImportPath}} IMPORT: {{.Imports}}' fmt
+stdout '^flag \[fmt\.test\] MAP: map\[fmt:fmt \[fmt\.test\]\]'
+stdout '^fmt\.test MAP: map\[(.* )?testing:testing \[fmt\.test\]'
+! stdout '^fmt\.test MAP: map\[(.* )?os:'
+stdout '^fmt\.test IMPORT: \[fmt \[fmt\.test\] fmt_test \[fmt\.test\] os reflect testing \[fmt\.test\] testing/internal/testdeps \[fmt\.test\]\]'
+
+
+-- a/b/b.go --
+package b
+
+import _ "c/d"
+-- a/vendor/c/d/d.go --
+package d
diff --git a/src/cmd/go/testdata/script/list_linkshared.txt b/src/cmd/go/testdata/script/list_linkshared.txt
new file mode 100644
index 0000000..baae1e2
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_linkshared.txt
@@ -0,0 +1,16 @@
+env GO111MODULE=on
+
+# golang.org/issue/35759: 'go list -linkshared'
+# panicked if invoked on a test-only package.
+
+[!buildmode:shared] skip
+
+go list -f '{{.ImportPath}}: {{.Target}} {{.Shlib}}' -linkshared .
+stdout '^example.com:  $'
+
+-- go.mod --
+module example.com
+
+go 1.14
+-- x.go --
+package x
diff --git a/src/cmd/go/testdata/script/list_load_err.txt b/src/cmd/go/testdata/script/list_load_err.txt
new file mode 100644
index 0000000..b3b7271
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_load_err.txt
@@ -0,0 +1,79 @@
+# go list -e -deps should list imports from any file it can read, even if
+# other files in the same package cause go/build.Import to return an error.
+# Verfifies golang.org/issue/38568
+
+
+go list -e -deps ./scan
+stdout m/want
+
+
+go list -e -deps ./multi
+stdout m/want
+
+
+go list -e -deps ./constraint
+stdout m/want
+
+
+[cgo] go list -e -test -deps ./cgotest
+[cgo] stdout m/want
+
+
+[cgo] go list -e -deps ./cgoflag
+[cgo] stdout m/want
+
+-- go.mod --
+module m
+
+go 1.14
+
+-- want/want.go --
+package want
+
+-- scan/scan.go --
+// scan error
+ʕ◔ϖ◔ʔ
+
+-- scan/good.go --
+package scan
+
+import _ "m/want"
+
+-- multi/a.go --
+package a
+
+-- multi/b.go --
+package b
+
+import _ "m/want"
+
+-- constraint/constraint.go --
+// +build !!nope
+
+package constraint
+
+-- constraint/good.go --
+package constraint
+
+import _ "m/want"
+
+-- cgotest/cgo_test.go --
+package cgo_test
+
+// cgo is not allowed in tests.
+// See golang.org/issue/18647
+
+import "C"
+import (
+	"testing"
+	_ "m/want"
+)
+
+func Test(t *testing.T) {}
+
+-- cgoflag/cgoflag.go --
+package cgoflag
+
+// #cgo ʕ◔ϖ◔ʔ:
+
+import _ "m/want"
diff --git a/src/cmd/go/testdata/script/list_overlay.txt b/src/cmd/go/testdata/script/list_overlay.txt
new file mode 100644
index 0000000..1153975
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_overlay.txt
@@ -0,0 +1,63 @@
+# Test listing with overlays
+
+# Overlay in an existing directory
+go list -overlay overlay.json  -f '{{.GoFiles}}' .
+stdout '^\[f.go\]$'
+
+# Overlays in a non-existing directory
+go list -overlay overlay.json -f '{{.GoFiles}}' ./dir
+stdout '^\[g.go\]$'
+
+# Overlays in an existing directory with already existing files
+go list -overlay overlay.json -f '{{.GoFiles}}' ./dir2
+stdout '^\[h.go i.go\]$'
+
+# Overlay that removes a file from a directory
+! go list ./dir3 # contains a file without a package statement
+go list -overlay overlay.json -f '{{.GoFiles}}' ./dir3 # overlay removes that file
+
+# Walking through an overlay
+go list -overlay overlay.json ./...
+cmp stdout want-list.txt
+
+# TODO(#39958): assembly files, C files, files that require cgo preprocessing
+
+-- want-list.txt --
+m
+m/dir
+m/dir2
+m/dir3
+-- go.mod --
+// TODO(#39958): Support and test overlays including go.mod itself (especially if mod=readonly)
+module m
+
+go 1.16
+
+-- dir2/h.go --
+package dir2
+
+-- dir3/good.go --
+package dir3
+-- dir3/bad.go --
+// no package statement
+-- overlay.json --
+{
+    "Replace": {
+        "f.go": "overlay/f_go",
+        "dir/g.go": "overlay/dir_g_go",
+        "dir2/i.go": "overlay/dir2_i_go",
+        "dir3/bad.go": ""
+    }
+}
+-- overlay/f_go --
+package m
+
+func f() {
+}
+-- overlay/dir_g_go --
+package m
+
+func g() {
+}
+-- overlay/dir2_i_go --
+package dir2
diff --git a/src/cmd/go/testdata/script/list_parse_err.txt b/src/cmd/go/testdata/script/list_parse_err.txt
new file mode 100644
index 0000000..3c53458
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_parse_err.txt
@@ -0,0 +1,45 @@
+# 'go list' without -e should fail and print errors on stderr.
+! go list ./p
+stderr '^p[/\\]b.go:2:2: expected ''package'', found ''EOF''$'
+! go list -f '{{range .Imports}}{{.}} {{end}}' ./p
+stderr '^p[/\\]b.go:2:2: expected ''package'', found ''EOF''$'
+! go list -test ./t
+stderr '^can''t load test package: t[/\\]t_test.go:8:1: expected declaration, found ʕ'
+! go list -test -f '{{range .Imports}}{{.}} {{end}}' ./t
+stderr '^can''t load test package: t[/\\]t_test.go:8:1: expected declaration, found ʕ'
+
+# 'go list -e' should report imports, even if some files have parse errors
+# before the import block.
+go list -e -f '{{range .Imports}}{{.}} {{end}}' ./p
+stdout '^fmt '
+
+# 'go list' should report the position of the error if there's only one.
+go list -e -f '{{.Error.Pos}} => {{.Error.Err}}' ./p
+stdout 'b.go:[0-9:]+ => expected ''package'', found ''EOF'''
+
+# 'go test' should report the position of the error if there's only one.
+go list -e -test -f '{{if .Error}}{{.Error.Pos}} => {{.Error.Err}}{{end}}' ./t
+stdout 't_test.go:[0-9:]+ => expected declaration, found ʕ'
+
+-- go.mod --
+module m
+
+go 1.13
+
+-- p/a.go --
+package a
+
+import "fmt"
+
+-- p/b.go --
+// no package statement
+
+-- t/t_test.go --
+package t
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+// scan error
+ʕ◔ϖ◔ʔ
diff --git a/src/cmd/go/testdata/script/list_permissions.txt b/src/cmd/go/testdata/script/list_permissions.txt
new file mode 100644
index 0000000..f65896c
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_permissions.txt
@@ -0,0 +1,84 @@
+env GO111MODULE=on
+
+# Establish baseline behavior, before mucking with file permissions.
+
+go list ./noread/...
+stdout '^example.com/noread$'
+
+go list example.com/noread/...
+stdout '^example.com/noread$'
+
+go list ./empty/...
+stderr 'matched no packages'
+
+[root] stop # Root typically ignores file permissions.
+
+# Make the directory ./noread unreadable, and verify that 'go list' reports an
+# explicit error for a pattern that should match it (rather than treating it as
+# equivalent to an empty directory).
+
+[windows] skip # Does not have Unix-style directory permissions.
+[plan9] skip   # Might not have Unix-style directory permissions.
+
+chmod 000 noread
+
+# Check explicit paths.
+
+! go list ./noread
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+
+! go list example.com/noread
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+
+# Check filesystem-relative patterns.
+
+! go list ./...
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern ./...: '
+
+! go list ./noread/...
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern ./noread/...: '
+
+
+# Check module-prefix patterns.
+
+! go list example.com/...
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern example.com/...: '
+
+! go list example.com/noread/...
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern example.com/noread/...: '
+
+
+[short] stop
+
+# Check global patterns, which should still
+# fail due to errors in the local module.
+
+! go list all
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern all: '
+
+! go list ...
+! stdout '^example.com/noread$'
+! stderr 'matched no packages'
+stderr '^pattern ...: '
+
+
+-- go.mod --
+module example.com
+go 1.15
+-- noread/noread.go --
+// Package noread exists, but will be made unreadable.
+package noread
+-- empty/README.txt --
+This directory intentionally left empty.
diff --git a/src/cmd/go/testdata/script/list_shadow.txt b/src/cmd/go/testdata/script/list_shadow.txt
new file mode 100644
index 0000000..7b24d93
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_shadow.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+env GOPATH=$WORK/gopath/src/shadow/root1${:}$WORK/gopath/src/shadow/root2
+
+# The math in root1 is not "math" because the standard math is.
+go list -f '({{.ImportPath}}) ({{.ConflictDir}})' ./shadow/root1/src/math
+stdout '^\(.*(\\|/)src(\\|/)shadow(\\|/)root1(\\|/)src(\\|/)math\) \('$GOROOT'(\\|/)?src(\\|/)math\)$'
+
+# The foo in root1 is "foo".
+go list -f '({{.ImportPath}}) ({{.ConflictDir}})' ./shadow/root1/src/foo
+stdout '^\(foo\) \(\)$'
+
+# The foo in root2 is not "foo" because the foo in root1 got there first.
+go list -f '({{.ImportPath}}) ({{.ConflictDir}})' ./shadow/root2/src/foo
+stdout '^\(.*gopath(\\|/)src(\\|/)shadow(\\|/)root2(\\|/)src(\\|/)foo\) \('$WORK'(\\|/)?gopath(\\|/)src(\\|/)shadow(\\|/)root1(\\|/)src(\\|/)foo\)$'
+
+# The error for go install should mention the conflicting directory.
+! go install -n ./shadow/root2/src/foo
+stderr 'go install: no install location for '$WORK'(\\|/)?gopath(\\|/)src(\\|/)shadow(\\|/)root2(\\|/)src(\\|/)foo: hidden by '$WORK'(\\|/)?gopath(\\|/)src(\\|/)shadow(\\|/)root1(\\|/)src(\\|/)foo'
+
+-- shadow/root1/src/foo/foo.go --
+package foo
+-- shadow/root1/src/math/math.go --
+package math
+-- shadow/root2/src/foo/foo.go --
+package foo
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/list_split_main.txt b/src/cmd/go/testdata/script/list_split_main.txt
new file mode 100644
index 0000000..74e7d5d
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_split_main.txt
@@ -0,0 +1,25 @@
+# This test checks that a "main" package with an external test package
+# is recompiled only once.
+# Verifies golang.org/issue/34321.
+
+env GO111MODULE=off
+
+go list -e -test -deps -f '{{if not .Standard}}{{.ImportPath}}{{end}}' pkg
+cmp stdout want
+
+-- $GOPATH/src/pkg/pkg.go --
+package main
+
+func main() {}
+
+-- $GOPATH/src/pkg/pkg_test.go --
+package main
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+-- want --
+pkg
+pkg [pkg.test]
+pkg.test
diff --git a/src/cmd/go/testdata/script/list_std.txt b/src/cmd/go/testdata/script/list_std.txt
new file mode 100644
index 0000000..6ab1bd1
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_std.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+
+[!gc] skip
+[short] skip
+
+# Listing GOROOT should only find standard packages.
+cd $GOROOT/src
+go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}' ./...
+! stdout .
+
+# Standard packages should include cmd, but not cmd/vendor.
+go list ./...
+stdout cmd/compile
+! stdout vendor/golang.org
+! stdout cmd/vendor
+
+# In GOPATH mode, packages vendored into GOROOT should be reported as standard.
+go list -f '{{if .Standard}}{{.ImportPath}}{{end}}' std cmd
+stdout golang.org/x/net/http2/hpack
+stdout cmd/vendor/golang\.org/x/arch/x86/x86asm
+
+# However, vendored packages should not match wildcard patterns beginning with cmd.
+go list cmd/...
+stdout cmd/compile
+! stdout cmd/vendor
diff --git a/src/cmd/go/testdata/script/list_symlink.txt b/src/cmd/go/testdata/script/list_symlink.txt
new file mode 100644
index 0000000..f74ca86
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_symlink.txt
@@ -0,0 +1,12 @@
+[!symlink] skip
+env GO111MODULE=off
+
+mkdir $WORK/tmp/src
+symlink $WORK/tmp/src/dir1 -> $WORK/tmp
+cp p.go $WORK/tmp/src/dir1/p.go
+env GOPATH=$WORK/tmp
+go list -f '{{.Root}}' dir1
+stdout '^'$WORK/tmp'$'
+
+-- p.go --
+package p
diff --git a/src/cmd/go/testdata/script/list_symlink_internal.txt b/src/cmd/go/testdata/script/list_symlink_internal.txt
new file mode 100644
index 0000000..f756a56
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_symlink_internal.txt
@@ -0,0 +1,27 @@
+[!symlink] skip
+env GO111MODULE=off
+
+mkdir $WORK/tmp/gopath/src/dir1/internal/v
+cp p.go $WORK/tmp/gopath/src/dir1/p.go
+cp v.go $WORK/tmp/gopath/src/dir1/internal/v/v.go
+symlink $WORK/tmp/symdir1 -> $WORK/tmp/gopath/src/dir1
+env GOPATH=$WORK/tmp/gopath
+cd $WORK/tmp/symdir1
+go list -f '{{.Root}}' .
+stdout '^'$WORK/tmp/gopath'$'
+
+# All of these should succeed, not die in internal-handling code.
+go run p.go &
+go build &
+go install &
+
+wait
+
+-- p.go --
+package main
+
+import _ `dir1/internal/v`
+
+func main() {}
+-- v.go --
+package v
diff --git a/src/cmd/go/testdata/script/list_symlink_vendor_issue14054.txt b/src/cmd/go/testdata/script/list_symlink_vendor_issue14054.txt
new file mode 100644
index 0000000..8e63a5a
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_symlink_vendor_issue14054.txt
@@ -0,0 +1,28 @@
+[!symlink] skip
+env GO111MODULE=off
+
+mkdir $WORK/tmp/gopath/src/dir1/vendor/v
+cp p.go $WORK/tmp/gopath/src/dir1/p.go
+cp v.go $WORK/tmp/gopath/src/dir1/vendor/v/v.go
+symlink $WORK/tmp/symdir1 -> $WORK/tmp/gopath/src/dir1
+env GOPATH=$WORK/tmp/gopath
+cd $WORK/tmp/symdir1
+
+go list -f '{{.Root}}' .
+stdout '^'$WORK/tmp/gopath'$'
+
+# All of these should succeed, not die in vendor-handling code.
+go run p.go &
+go build &
+go install &
+
+wait
+
+-- p.go --
+package main
+
+import _ `v`
+
+func main () {}
+-- v.go --
+package v
diff --git a/src/cmd/go/testdata/script/list_symlink_vendor_issue15201.txt b/src/cmd/go/testdata/script/list_symlink_vendor_issue15201.txt
new file mode 100644
index 0000000..19f2138
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_symlink_vendor_issue15201.txt
@@ -0,0 +1,21 @@
+[!symlink] skip
+env GO111MODULE=off
+
+mkdir $WORK/tmp/gopath/src/x/y/_vendor/src/x
+symlink $WORK/tmp/gopath/src/x/y/_vendor/src/x/y -> ../../..
+mkdir $WORK/tmp/gopath/src/x/y/_vendor/src/x/y/w
+cp w.go $WORK/tmp/gopath/src/x/y/w/w.go
+symlink $WORK/tmp/gopath/src/x/y/w/vendor -> ../_vendor/src
+mkdir $WORK/tmp/gopath/src/x/y/_vendor/src/x/y/z
+cp z.go $WORK/tmp/gopath/src/x/y/z/z.go
+
+env GOPATH=$WORK/tmp/gopath/src/x/y/_vendor${:}$WORK/tmp/gopath
+cd $WORK/tmp/gopath/src
+go list ./...
+
+-- w.go --
+package w
+
+import "x/y/z"
+-- z.go --
+package z
diff --git a/src/cmd/go/testdata/script/list_test_e.txt b/src/cmd/go/testdata/script/list_test_e.txt
new file mode 100644
index 0000000..263892b
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_test_e.txt
@@ -0,0 +1,11 @@
+env GO111MODULE=off
+
+# issue 25980: crash in go list -e -test
+go list -e -test -deps -f '{{.Error}}' p
+stdout '^p[/\\]d_test.go:2:8: cannot find package "d" in any of:'
+
+-- p/d.go --
+package d
+-- p/d_test.go --
+package d_test
+import _ "d"
diff --git a/src/cmd/go/testdata/script/list_test_err.txt b/src/cmd/go/testdata/script/list_test_err.txt
new file mode 100644
index 0000000..c6f1ecf
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_test_err.txt
@@ -0,0 +1,129 @@
+env GO111MODULE=off
+
+# issue 28491: errors in test source files should not prevent
+# "go list -test" from returning useful information.
+
+# go list prints information for package, internal test,
+# external test, but not testmain package when there is a
+# syntax error in test sources.
+! go list -test -deps syntaxerr
+stdout pkgdep
+stdout testdep_a
+stdout testdep_b
+stdout ^syntaxerr$
+stdout '^syntaxerr \[syntaxerr.test\]'
+stdout '^syntaxerr_test \[syntaxerr.test\]'
+! stdout '^syntaxerr\.test'
+stderr 'expected declaration'
+
+# go list -e prints information for all test packages.
+# The syntax error is shown in the package error field.
+go list -e -test -deps -f '{{.ImportPath}} {{.Error | printf "%q"}}' syntaxerr
+stdout 'pkgdep <nil>'
+stdout 'testdep_a <nil>'
+stdout 'testdep_b <nil>'
+stdout 'syntaxerr <nil>'
+stdout 'syntaxerr \[syntaxerr.test\] <nil>'
+stdout 'syntaxerr_test \[syntaxerr.test\] <nil>'
+stdout 'syntaxerr\.test "[^"]*expected declaration'
+! stderr 'expected declaration'
+
+[short] stop
+
+# go list prints partial information with test naming error
+! go list -test -deps nameerr
+stdout pkgdep
+stdout testdep_a
+stdout testdep_b
+stderr 'wrong signature for TestBad'
+
+go list -e -test -deps -f '{{.ImportPath}} {{.Error | printf "%q"}}' nameerr
+stdout 'pkgdep <nil>'
+stdout 'testdep_a <nil>'
+stdout 'testdep_b <nil>'
+stdout 'nameerr\.test "[^"]*wrong signature for TestBad'
+! stderr 'wrong signature for TestBad'
+
+# go list prints partial information with error if test has cyclic import
+! go list -test -deps cycleerr
+stdout cycleerr
+stderr 'import cycle not allowed in test'
+
+go list -e -test -deps -f '{{.ImportPath}} {{.Error | printf "%q"}}' cycleerr
+stdout 'cycleerr <nil>'
+stdout 'testdep_a <nil>'
+stdout 'testdep_cycle <nil>'
+stdout 'cycleerr \[cycleerr.test\] "[^"]*import cycle not allowed in test'
+! stderr 'import cycle not allowed in test'
+
+-- syntaxerr/syntaxerr.go --
+package syntaxerr
+
+import _ "pkgdep"
+
+-- syntaxerr/syntaxerr_ie_test.go --
+package syntaxerr
+
+!!!syntax error
+
+-- syntaxerr/syntaxerr_xe_test.go --
+package syntaxerr_test
+
+!!!syntax error
+
+-- syntaxerr/syntaxerr_i_test.go --
+package syntaxerr
+
+import _ "testdep_a"
+
+-- syntaxerr/syntaxerr_x_test.go --
+package syntaxerr
+
+import _ "testdep_b"
+
+-- nameerr/nameerr.go --
+package nameerr
+
+import _ "pkgdep"
+
+-- nameerr/nameerr_i_test.go --
+package nameerr
+
+import (
+  _ "testdep_a"
+  "testing"
+)
+
+func TestBad(t *testing.B) {}
+
+-- nameerr/nameerr_x_test.go --
+package nameerr_test
+
+import (
+  _ "testdep_b"
+  "testing"
+)
+
+func TestBad(t *testing.B) {}
+
+-- cycleerr/cycleerr_test.go --
+package cycleerr
+
+import (
+  _ "testdep_a"
+  _ "testdep_cycle"
+)
+
+-- pkgdep/pkgdep.go --
+package pkgdep
+
+-- testdep_a/testdep_a.go --
+package testdep_a
+
+-- testdep_b/testdep_b.go --
+package testdep_b
+
+-- testdep_cycle/testdep_cycle.go --
+package testdep_cycle
+
+import _ "cycleerr"
diff --git a/src/cmd/go/testdata/script/list_test_imports.txt b/src/cmd/go/testdata/script/list_test_imports.txt
new file mode 100644
index 0000000..0342eba
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_test_imports.txt
@@ -0,0 +1,21 @@
+env GO111MODULE=off
+
+# issue 26880: list with tests has wrong variant in imports
+go list -test -f '{{.ImportPath}}:{{with .Imports}} {{join . ", "}}{{end}}' a b
+cmp stdout imports.txt
+
+-- a/a.go --
+package a; import _ "b"
+-- b/b.go --
+package b
+-- b/b_test.go --
+package b
+-- b/b_x_test.go --
+package b_test; import _ "a"
+
+-- imports.txt --
+a: b
+b:
+b.test: b [b.test], b_test [b.test], os, reflect, testing, testing/internal/testdeps
+b [b.test]:
+b_test [b.test]: a [b.test]
diff --git a/src/cmd/go/testdata/script/list_test_non_go_files.txt b/src/cmd/go/testdata/script/list_test_non_go_files.txt
new file mode 100644
index 0000000..6b2b633
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_test_non_go_files.txt
@@ -0,0 +1,13 @@
+env GO111MODULE=off
+
+# issue 29899: handling files with non-Go extension
+go list -e -test -json -- c.c x.go
+stdout '"Err": "named files must be .go files: c.c"'
+
+! go list -test -json -- c.c x.go
+stderr '^named files must be \.go files: c\.c$'
+
+-- x.go --
+package main
+-- c.c --
+package c
diff --git a/src/cmd/go/testdata/script/list_test_simple.txt b/src/cmd/go/testdata/script/list_test_simple.txt
new file mode 100644
index 0000000..954897c
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_test_simple.txt
@@ -0,0 +1,67 @@
+[short] skip
+
+# Test
+go test -list=Test
+stdout TestSimple
+
+# Benchmark
+go test -list=Benchmark
+stdout BenchmarkSimple
+
+# Examples
+go test -list=Example
+stdout ExampleSimple
+stdout ExampleWithEmptyOutput
+
+-- go.mod --
+module m
+
+go 1.16
+-- bench_test.go --
+package testlist
+
+import (
+	"fmt"
+	"testing"
+)
+
+func BenchmarkSimplefunc(b *testing.B) {
+	b.StopTimer()
+	b.StartTimer()
+	for i := 0; i < b.N; i++ {
+		_ = fmt.Sprint("Test for bench")
+	}
+}
+-- example_test.go --
+package testlist
+
+import (
+	"fmt"
+)
+
+func ExampleSimple() {
+	fmt.Println("Test with Output.")
+
+	// Output: Test with Output.
+}
+
+func ExampleWithEmptyOutput() {
+	fmt.Println("")
+
+	// Output:
+}
+
+func ExampleNoOutput() {
+	_ = fmt.Sprint("Test with no output")
+}
+-- test_test.go --
+package testlist
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestSimple(t *testing.T) {
+	_ = fmt.Sprint("Test simple")
+}
diff --git a/src/cmd/go/testdata/script/list_wildcard_skip_nonmatching.txt b/src/cmd/go/testdata/script/list_wildcard_skip_nonmatching.txt
new file mode 100644
index 0000000..02b1088
--- /dev/null
+++ b/src/cmd/go/testdata/script/list_wildcard_skip_nonmatching.txt
@@ -0,0 +1,17 @@
+# Test that wildcards don't look in useless directories.
+
+# First make sure that badpkg fails the list of '...'.
+! go list ./...
+stderr badpkg
+
+# Check that the list of './goodpkg...' succeeds. That implies badpkg was skipped.
+go list ./goodpkg...
+
+-- go.mod --
+module m
+
+go 1.16
+-- goodpkg/x.go --
+package goodpkg
+-- badpkg/x.go --
+pkg badpkg
diff --git a/src/cmd/go/testdata/script/load_test_pkg_err.txt b/src/cmd/go/testdata/script/load_test_pkg_err.txt
new file mode 100644
index 0000000..d088ee4
--- /dev/null
+++ b/src/cmd/go/testdata/script/load_test_pkg_err.txt
@@ -0,0 +1,30 @@
+# Tests issue 37971. Check that tests are still loaded even when the package has an error.
+
+go list -e -test d
+cmp stdout want_stdout
+
+go list -e -test -deps d
+stdout golang.org/fake/d
+
+-- want_stdout --
+d
+d.test
+d_test [d.test]
+-- go.mod --
+module d
+
+go 1.16
+-- d.go --
+package d
+
+import "net/http"
+
+const d = http.MethodGet
+func Get() string { return d; }
+-- d2.go --
+-- d_test.go --
+package d_test
+
+import "testing"
+import "golang.org/fake/d"
+func TestD(t *testing.T) { d.Get(); }
diff --git a/src/cmd/go/testdata/script/mod_all.txt b/src/cmd/go/testdata/script/mod_all.txt
new file mode 100644
index 0000000..aac6629
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_all.txt
@@ -0,0 +1,444 @@
+# This test illustrates the relationship between the 'all' pattern and
+# the dependencies of the main module.
+
+# The package import graph used in this test looks like:
+#
+# main --------- a --------- b
+# |              |
+# |              a_test ---- c
+# |                          |
+# |                          c_test ---- d
+# |
+# main_test ---- t --------- u
+#                |
+#                t_test ---- w
+#                            |
+#                            w_test ---- x
+#
+# main/testonly_test ---- q --------- r
+#                         |
+#                         q_test ---- s
+#
+# And the module dependency graph looks like:
+#
+# main --- a.1 ---- b.1
+#  \   \    \
+#   \   \    c.1 -- d.1
+#    \   \
+#     \    t.1 ---- u.1
+#      \    \
+#       \    w.1 -- x.1
+#        \
+#          q.1 ---- r.1
+#           \
+#            s.1
+
+env PKGFMT='{{if .Module}}{{.ImportPath}}{{end}}'
+env MODFMT='{{.Path}}'
+
+
+# 'go list -deps' lists packages and tests in the main module,
+# along with their transitive dependencies.
+
+go list -f $PKGFMT -deps ./...
+stdout -count=4 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly'
+
+
+# 'go list -deps -test' lists transitive imports of tests and non-tests in the
+# main module.
+
+go list -f $PKGFMT -deps -test ./...
+stdout -count=13 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main.test$'
+stdout '^example.com/main \[example.com/main.test\]$'
+stdout '^example.com/main_test \[example.com/main.test\]$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/main/testonly.test$'
+stdout '^example.com/main/testonly_test \[example.com/main/testonly.test\]$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+
+
+# 'go list all' lists the fixpoint of iterating 'go list -deps -test' starting
+# with the packages in the main module, then reducing to only the non-test
+# variants of those packages.
+
+go list -f $PKGFMT all
+stdout -count=13 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/c$'
+stdout '^example.com/d$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/s$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/w$'
+stdout '^example.com/x$'
+
+
+# 'go list -test all' is equivalent to 'go list -test $(go list all)'
+# and both should include tests for every package in 'all'.
+
+go list -test -f $PKGFMT example.com/a example.com/b example.com/c example.com/d example.com/main example.com/main/testonly example.com/q example.com/r example.com/s example.com/t example.com/u example.com/w example.com/x
+cp stdout list-test-explicit.txt
+
+go list -test -f $PKGFMT all
+cmp stdout list-test-explicit.txt
+stdout -count=36 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/c$'
+stdout '^example.com/d$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/s$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/w$'
+stdout '^example.com/x$'
+stdout '^example.com/a.test$'
+stdout '^example.com/a_test \[example.com/a.test\]$'
+stdout '^example.com/b.test$'
+stdout '^example.com/b_test \[example.com/b.test\]$'
+stdout '^example.com/c.test$'
+stdout '^example.com/c_test \[example.com/c.test\]$'
+stdout '^example.com/main.test$'
+stdout '^example.com/main \[example.com/main.test\]$'
+stdout '^example.com/main_test \[example.com/main.test\]$'
+stdout '^example.com/main/testonly.test$'
+stdout '^example.com/main/testonly_test \[example.com/main/testonly.test\]$'
+stdout '^example.com/q.test$'
+stdout '^example.com/q_test \[example.com/q.test\]$'
+stdout '^example.com/r.test$'
+stdout '^example.com/r_test \[example.com/r.test\]$'
+stdout '^example.com/s.test$'
+stdout '^example.com/s_test \[example.com/s.test\]$'
+stdout '^example.com/t.test$'
+stdout '^example.com/t_test \[example.com/t.test\]$'
+stdout '^example.com/u.test$'
+stdout '^example.com/u_test \[example.com/u.test\]$'
+stdout '^example.com/w.test$'
+stdout '^example.com/w_test \[example.com/w.test\]$'
+
+
+# 'go list -m all' covers the packages in 'go list -test -deps all'.
+
+go list -m -f $MODFMT all
+stdout -count=12 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/c$'
+stdout '^example.com/d$'
+stdout '^example.com/main$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/s$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/w$'
+stdout '^example.com/x$'
+
+
+# 'go mod vendor' copies in only the packages transitively imported by the main
+# module, and omits their tests. As a result, the 'all' and '...' patterns
+# report fewer packages when using '-mod=vendor'.
+
+go mod vendor
+
+go list -f $PKGFMT -mod=vendor all
+stdout -count=8 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+
+go list -test -f $PKGFMT -mod=vendor all
+stdout -count=13 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/main.test$'
+stdout '^example.com/main \[example.com/main.test\]$'
+stdout '^example.com/main_test \[example.com/main.test\]$'
+stdout '^example.com/main/testonly.test$'
+stdout '^example.com/main/testonly_test \[example.com/main/testonly.test\]$'
+
+rm vendor
+
+# Convert all modules to go 1.16 to enable lazy loading.
+go mod edit -go=1.16 a/go.mod
+go mod edit -go=1.16 b/go.mod
+go mod edit -go=1.16 c/go.mod
+go mod edit -go=1.16 d/go.mod
+go mod edit -go=1.16 q/go.mod
+go mod edit -go=1.16 r/go.mod
+go mod edit -go=1.16 s/go.mod
+go mod edit -go=1.16 t/go.mod
+go mod edit -go=1.16 u/go.mod
+go mod edit -go=1.16 w/go.mod
+go mod edit -go=1.16 x/go.mod
+go mod edit -go=1.16
+
+# With lazy loading, 'go list all' with neither -mod=vendor nor -test should
+# match -mod=vendor without -test in 1.15.
+
+go list -f $PKGFMT all
+stdout -count=8 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+
+# 'go list -test all' should expand that to include the test variants of the
+# packages in 'all', but not the dependencies of outside tests.
+
+go list -test -f $PKGFMT all
+stdout -count=25 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/a.test$'
+stdout '^example.com/a_test \[example.com/a.test\]$'
+stdout '^example.com/b.test$'
+stdout '^example.com/b_test \[example.com/b.test\]$'
+stdout '^example.com/main.test$'
+stdout '^example.com/main \[example.com/main.test\]$'
+stdout '^example.com/main_test \[example.com/main.test\]$'
+stdout '^example.com/main/testonly.test$'
+stdout '^example.com/main/testonly_test \[example.com/main/testonly.test\]$'
+stdout '^example.com/q.test$'
+stdout '^example.com/q_test \[example.com/q.test\]$'
+stdout '^example.com/r.test$'
+stdout '^example.com/r_test \[example.com/r.test\]$'
+stdout '^example.com/t.test$'
+stdout '^example.com/t_test \[example.com/t.test\]$'
+stdout '^example.com/u.test$'
+stdout '^example.com/u_test \[example.com/u.test\]$'
+
+# 'go list -test -deps all' should include the dependencies of those tests,
+# but not the tests of the dependencies of outside tests.
+
+go list -test -deps -f $PKGFMT all
+stdout -count=28 '^.'
+stdout '^example.com/a$'
+stdout '^example.com/b$'
+stdout '^example.com/c$'
+stdout '^example.com/main$'
+stdout '^example.com/main/testonly$'
+stdout '^example.com/q$'
+stdout '^example.com/r$'
+stdout '^example.com/s$'
+stdout '^example.com/t$'
+stdout '^example.com/u$'
+stdout '^example.com/w$'
+stdout '^example.com/a.test$'
+stdout '^example.com/a_test \[example.com/a.test\]$'
+stdout '^example.com/b.test$'
+stdout '^example.com/b_test \[example.com/b.test\]$'
+stdout '^example.com/main.test$'
+stdout '^example.com/main \[example.com/main.test\]$'
+stdout '^example.com/main_test \[example.com/main.test\]$'
+stdout '^example.com/main/testonly.test$'
+stdout '^example.com/main/testonly_test \[example.com/main/testonly.test\]$'
+stdout '^example.com/q.test$'
+stdout '^example.com/q_test \[example.com/q.test\]$'
+stdout '^example.com/r.test$'
+stdout '^example.com/r_test \[example.com/r.test\]$'
+stdout '^example.com/t.test$'
+stdout '^example.com/t_test \[example.com/t.test\]$'
+stdout '^example.com/u.test$'
+stdout '^example.com/u_test \[example.com/u.test\]$'
+
+
+# TODO(#36460):
+# 'go list -m all' should exactly cover the packages in 'go list -test all'.
+
+-- go.mod --
+module example.com/main
+
+go 1.15
+
+require (
+	example.com/a v0.1.0
+	example.com/b v0.1.0
+	example.com/q v0.1.0
+	example.com/t v0.1.0
+)
+
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/b v0.1.0 => ./b
+	example.com/c v0.1.0 => ./c
+	example.com/d v0.1.0 => ./d
+	example.com/q v0.1.0 => ./q
+	example.com/r v0.1.0 => ./r
+	example.com/s v0.1.0 => ./s
+	example.com/t v0.1.0 => ./t
+	example.com/u v0.1.0 => ./u
+	example.com/w v0.1.0 => ./w
+	example.com/x v0.1.0 => ./x
+)
+-- main.go --
+package main
+
+import _ "example.com/a"
+
+func main() {}
+-- main_test.go --
+package main_test
+
+import _ "example.com/t"
+-- testonly/testonly_test.go --
+package testonly_test
+
+import _ "example.com/q"
+-- a/go.mod --
+module example.com/a
+
+go 1.15
+
+require (
+	example.com/b v0.1.0
+	example.com/c v0.1.0
+)
+-- a/a.go --
+package a
+
+import _ "example.com/b"
+-- a/a_test.go --
+package a_test
+
+import _ "example.com/c"
+-- b/go.mod --
+module example.com/b
+
+go 1.15
+-- b/b.go --
+package b
+-- b/b_test.go --
+package b_test
+-- c/go.mod --
+module example.com/c
+
+go 1.15
+
+require example.com/d v0.1.0
+-- c/c.go --
+package c
+-- c/c_test.go --
+package c_test
+
+import _ "example.com/d"
+-- d/go.mod --
+module example.com/d
+
+go 1.15
+-- d/d.go --
+package d
+-- q/go.mod --
+module example.com/q
+
+go 1.15
+
+require (
+	example.com/r v0.1.0
+	example.com/s v0.1.0
+)
+-- q/q.go --
+package q
+import _ "example.com/r"
+-- q/q_test.go --
+package q_test
+import _ "example.com/s"
+-- r/go.mod --
+module example.com/r
+
+go 1.15
+-- r/r.go --
+package r
+-- r/r_test.go --
+package r_test
+-- s/go.mod --
+module example.com/s
+
+go 1.15
+-- s/s.go --
+package s
+-- s/s_test.go --
+package s_test
+-- t/go.mod --
+module example.com/t
+
+go 1.15
+
+require (
+	example.com/u v0.1.0
+	example.com/w v0.1.0
+)
+-- t/t.go --
+package t
+
+import _ "example.com/u"
+-- t/t_test.go --
+package t_test
+
+import _ "example.com/w"
+-- u/go.mod --
+module example.com/u
+
+go 1.15
+-- u/u.go --
+package u
+-- u/u_test.go --
+package u_test
+-- w/go.mod --
+module example.com/w
+
+go 1.15
+
+require example.com/x v0.1.0
+-- w/w.go --
+package w
+-- w/w_test.go --
+package w_test
+
+import _ "example.com/x"
+-- x/go.mod --
+module example.com/x
+
+go 1.15
+-- x/x.go --
+package x
diff --git a/src/cmd/go/testdata/script/mod_alt_goroot.txt b/src/cmd/go/testdata/script/mod_alt_goroot.txt
new file mode 100644
index 0000000..32f94c5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_alt_goroot.txt
@@ -0,0 +1,20 @@
+env GO111MODULE=on
+
+# If the working directory is a different GOROOT, then the 'std' module should be
+# treated as an ordinary module (with an ordinary module prefix).
+# It should not override packages in GOROOT, but should not fail the command.
+# See golang.org/issue/30756.
+go list -e -deps -f '{{.ImportPath}} {{.Dir}}' ./bytes
+stdout ^std/bytes.*$PWD[/\\]bytes
+stdout '^bytes/modified'
+
+-- go.mod --
+module std
+
+go 1.12
+-- bytes/bytes.go --
+package bytes
+
+import _"bytes/modified"
+-- bytes/modified/modified.go --
+package modified
diff --git a/src/cmd/go/testdata/script/mod_ambiguous_import.txt b/src/cmd/go/testdata/script/mod_ambiguous_import.txt
new file mode 100644
index 0000000..feaf5d2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_ambiguous_import.txt
@@ -0,0 +1,48 @@
+env GO111MODULE=on
+
+cd $WORK
+
+# An import provided by two different modules should be flagged as an error.
+! go build ./importx
+stderr '^importx[/\\]importx.go:2:8: ambiguous import: found package example.com/a/x in multiple modules:\n\texample.com/a v0.1.0 \('$WORK'[/\\]a[/\\]x\)\n\texample.com/a/x v0.1.0 \('$WORK'[/\\]ax\)$'
+
+# However, it should not be an error if that import is unused.
+go build ./importy
+
+# An import provided by both the main module and the vendor directory
+# should be flagged as an error only when -mod=vendor is set.
+mkdir vendor/example.com/m/importy
+cp $WORK/importy/importy.go vendor/example.com/m/importy/importy.go
+go build example.com/m/importy
+! go build -mod=vendor example.com/m/importy
+stderr '^ambiguous import: found package example.com/m/importy in multiple directories:\n\t'$WORK'[/\\]importy\n\t'$WORK'[/\\]vendor[/\\]example.com[/\\]m[/\\]importy$'
+
+-- $WORK/go.mod --
+module example.com/m
+go 1.13
+require (
+	example.com/a v0.1.0
+	example.com/a/x v0.1.0
+)
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/a/x v0.1.0 => ./ax
+)
+-- $WORK/importx/importx.go --
+package importx
+import _ "example.com/a/x"
+-- $WORK/importy/importy.go --
+package importy
+import _ "example.com/a/y"
+-- $WORK/a/go.mod --
+module example.com/a
+go 1.14
+-- $WORK/a/x/x.go --
+package x
+-- $WORK/a/y/y.go --
+package y
+-- $WORK/ax/go.mod --
+module example.com/a/x
+go 1.14
+-- $WORK/ax/x.go --
+package x
diff --git a/src/cmd/go/testdata/script/mod_auth.txt b/src/cmd/go/testdata/script/mod_auth.txt
new file mode 100644
index 0000000..d8ea586
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_auth.txt
@@ -0,0 +1,35 @@
+[!net] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+env GOVCS='*:off'
+
+# Without credentials, downloading a module from a path that requires HTTPS
+# basic auth should fail.
+env NETRC=$WORK/empty
+! go mod tidy
+stderr '^\tserver response: ACCESS DENIED, buddy$'
+stderr '^\tserver response: File\? What file\?$'
+
+# With credentials from a netrc file, it should succeed.
+env NETRC=$WORK/netrc
+go mod tidy
+go list all
+stdout vcs-test.golang.org/auth/or401
+stdout vcs-test.golang.org/auth/or404
+
+-- go.mod --
+module private.example.com
+-- main.go --
+package useprivate
+
+import (
+	_ "vcs-test.golang.org/auth/or401"
+	_ "vcs-test.golang.org/auth/or404"
+)
+-- $WORK/empty --
+-- $WORK/netrc --
+machine vcs-test.golang.org
+	login aladdin
+	password opensesame
diff --git a/src/cmd/go/testdata/script/mod_bad_domain.txt b/src/cmd/go/testdata/script/mod_bad_domain.txt
new file mode 100644
index 0000000..7a270d0
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_bad_domain.txt
@@ -0,0 +1,47 @@
+env GO111MODULE=on
+
+# explicit get should report errors about bad names
+! go get appengine
+stderr '^go get: malformed module path "appengine": missing dot in first path element$'
+! go get x/y.z
+stderr 'malformed module path "x/y.z": missing dot in first path element'
+
+
+# 'go list -m' should report errors about module names, never GOROOT.
+! go list -m -versions appengine
+stderr 'malformed module path "appengine": missing dot in first path element'
+! go list -m -versions x/y.z
+stderr 'malformed module path "x/y.z": missing dot in first path element'
+
+
+# build should report all unsatisfied imports,
+# but should be more definitive about non-module import paths
+! go build ./useappengine
+stderr '^useappengine[/\\]x.go:2:8: cannot find package$'
+! go build ./usenonexistent
+stderr '^usenonexistent[/\\]x.go:2:8: no required module provides package nonexistent.rsc.io; to add it:\n\tgo get nonexistent.rsc.io$'
+
+
+# 'get -d' should be similarly definitive
+
+go get -d ./useappengine  # TODO(#41315): This should fail.
+ # stderr '^useappengine[/\\]x.go:2:8: cannot find package$'
+
+! go get -d  ./usenonexistent
+stderr '^x/usenonexistent imports\n\tnonexistent.rsc.io: cannot find module providing package nonexistent.rsc.io$'
+
+
+# go mod vendor and go mod tidy should ignore appengine imports.
+rm usenonexistent/x.go
+go mod tidy
+go mod vendor
+
+-- go.mod --
+module x
+
+-- useappengine/x.go --
+package useappengine
+import _ "appengine" // package does not exist
+-- usenonexistent/x.go --
+package usenonexistent
+import _ "nonexistent.rsc.io" // domain does not exist
diff --git a/src/cmd/go/testdata/script/mod_bad_filenames.txt b/src/cmd/go/testdata/script/mod_bad_filenames.txt
new file mode 100644
index 0000000..eb556f4
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_bad_filenames.txt
@@ -0,0 +1,11 @@
+env GO111MODULE=on
+
+! go get rsc.io/badfile1 rsc.io/badfile2 rsc.io/badfile3 rsc.io/badfile4 rsc.io/badfile5
+! stderr 'unzip.*badfile1'
+stderr 'unzip.*badfile2[\\/]@v[\\/]v1.0.0.zip:.*malformed file path "☺.go": invalid char ''☺'''
+stderr 'unzip.*badfile3[\\/]@v[\\/]v1.0.0.zip: rsc.io[\\/]badfile3@v1.0.0[\\/]x\?y.go: malformed file path "x\?y.go": invalid char ''\?'''
+stderr 'unzip.*badfile4[\\/]@v[\\/]v1.0.0.zip: rsc.io[\\/]badfile4@v1.0.0[\\/]x[\\/]y.go: case-insensitive file name collision: "x/Y.go" and "x/y.go"'
+stderr 'unzip.*badfile5[\\/]@v[\\/]v1.0.0.zip: rsc.io[\\/]badfile5@v1.0.0[\\/]x[\\/]Y[\\/]zz[\\/]ww.go: case-insensitive file name collision: "x/y" and "x/Y"'
+
+-- go.mod --
+module x
diff --git a/src/cmd/go/testdata/script/mod_build_info_err.txt b/src/cmd/go/testdata/script/mod_build_info_err.txt
new file mode 100644
index 0000000..cee055e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_build_info_err.txt
@@ -0,0 +1,33 @@
+# This test verifies that line numbers are included in module import errors.
+# Verifies golang.org/issue/34393.
+
+go list -e -mod=mod -deps -f '{{with .Error}}{{.Pos}}: {{.Err}}{{end}}' ./main
+stdout '^bad[/\\]bad.go:3:8: malformed import path "🐧.example.com/string": invalid char ''🐧''$'
+
+# TODO(#26909): This should include an import stack.
+# (Today it includes only a file and line.)
+! go build ./main
+stderr '^bad[/\\]bad.go:3:8: malformed import path "🐧.example.com/string": invalid char ''🐧''$'
+
+# TODO(#41688): This should include a file and line, and report the reason for the error..
+# (Today it includes only an import stack.)
+! go get -d ./main
+stderr '^m/main imports\n\tm/bad imports\n\t🐧.example.com/string: malformed import path "🐧.example.com/string": invalid char ''🐧''$'
+
+
+-- go.mod --
+module m
+
+go 1.13
+
+-- main/main.go --
+package main
+
+import _ "m/bad"
+
+func main() {}
+
+-- bad/bad.go --
+package bad
+
+import _ "🐧.example.com/string"
diff --git a/src/cmd/go/testdata/script/mod_build_tags.txt b/src/cmd/go/testdata/script/mod_build_tags.txt
new file mode 100644
index 0000000..ae1d605
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_build_tags.txt
@@ -0,0 +1,33 @@
+# Test that build tags are used.
+# golang.org/issue/24053.
+
+env GO111MODULE=on
+
+cd x
+! go list -f {{.GoFiles}}
+stderr 'build constraints exclude all Go files'
+
+go list -f {{.GoFiles}} -tags tag1
+stdout '\[x.go\]'
+
+go list -f {{.GoFiles}} -tags tag2
+stdout '\[y\.go\]'
+
+go list -f {{.GoFiles}} -tags 'tag1 tag2'
+stdout '\[x\.go y\.go\]'
+
+go list -f {{.GoFiles}} -tags tag1,tag2 # commas allowed as of Go 1.13
+stdout '\[x\.go y\.go\]'
+
+-- x/go.mod --
+module x
+
+-- x/x.go --
+// +build tag1
+
+package y
+
+-- x/y.go --
+// +build tag2
+
+package y
diff --git a/src/cmd/go/testdata/script/mod_build_versioned.txt b/src/cmd/go/testdata/script/mod_build_versioned.txt
new file mode 100644
index 0000000..d1d74de
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_build_versioned.txt
@@ -0,0 +1,17 @@
+env GO111MODULE=on
+[short] skip
+
+go get -d rsc.io/fortune/v2
+
+# The default executable name shouldn't be v2$GOEXE
+go build rsc.io/fortune/v2
+! exists v2$GOEXE
+exists fortune$GOEXE
+
+# The default test binary name shouldn't be v2.test$GOEXE
+go test -c rsc.io/fortune/v2
+! exists v2.test$GOEXE
+exists fortune.test$GOEXE
+
+-- go.mod --
+module scratch
diff --git a/src/cmd/go/testdata/script/mod_cache_rw.txt b/src/cmd/go/testdata/script/mod_cache_rw.txt
new file mode 100644
index 0000000..a541076
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_cache_rw.txt
@@ -0,0 +1,49 @@
+# Regression test for golang.org/issue/31481.
+
+env GO111MODULE=on
+
+# golang.org/issue/31481: an explicit flag should make directories in the module
+# cache writable in order to work around the historical inability of 'rm -rf' to
+# forcibly remove files in unwritable directories.
+go get -modcacherw -d rsc.io/quote@v1.5.2
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/extraneous_file.go
+
+# After adding an extraneous file, 'go mod verify' should fail.
+! go mod verify
+
+# However, files within those directories should still be read-only to avoid
+# accidental mutations.
+[!root] ! cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+
+# If all 'go' commands ran with the flag, the system's 'rm' binary
+# should be able to remove the module cache if the '-rf' flags are set.
+[!windows] [exec:rm] exec rm -rf $GOPATH/pkg/mod
+[!windows] [!exec:rm] go clean -modcache
+[windows] [exec:cmd.exe] exec cmd.exe /c rmdir /s /q $GOPATH\pkg\mod
+[windows] [!exec:cmd.exe] go clean -modcache
+! exists $GOPATH/pkg/mod
+
+# The directories in the module cache should by default be unwritable,
+# so that tests and tools will not accidentally add extraneous files to them.
+# Windows does not respect FILE_ATTRIBUTE_READONLY on directories, according
+# to MSDN, so there we disable testing whether the directory itself is
+# unwritable.
+go get -d rsc.io/quote@latest
+[!root] ! cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+[!windows] [!root] ! cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/extraneous_file.go
+! exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/extraneous_file.go
+
+
+# Repeat part of the test with 'go mod download' instead of 'go get' to verify
+# -modcacherw is supported on 'go mod' subcommands.
+go clean -modcache
+go mod download -modcacherw rsc.io/quote
+cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/extraneous_file.go
+! go mod verify
+[!root] ! cp $WORK/extraneous.txt $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+
+
+-- $WORK/extraneous.txt --
+module oops
+-- go.mod --
+module golang.org/issue/31481
diff --git a/src/cmd/go/testdata/script/mod_case.txt b/src/cmd/go/testdata/script/mod_case.txt
new file mode 100644
index 0000000..4a46986
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_case.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=on
+
+go get -d
+go list -m all
+stdout '^rsc.io/quote v1.5.2'
+stdout '^rsc.io/QUOTE v1.5.2'
+
+go list -f 'DIR {{.Dir}} DEPS {{.Deps}}' rsc.io/QUOTE/QUOTE
+stdout 'DEPS.*rsc.io/quote'
+stdout 'DIR.*!q!u!o!t!e'
+
+go get -d rsc.io/QUOTE@v1.5.3-PRE
+go list -m all
+stdout '^rsc.io/QUOTE v1.5.3-PRE'
+
+go list -f '{{.Dir}}' rsc.io/QUOTE/QUOTE
+stdout '!q!u!o!t!e@v1.5.3-!p!r!e'
+
+-- go.mod --
+module x
+
+-- use.go --
+package use
+
+import _ "rsc.io/QUOTE/QUOTE"
diff --git a/src/cmd/go/testdata/script/mod_case_cgo.txt b/src/cmd/go/testdata/script/mod_case_cgo.txt
new file mode 100644
index 0000000..f3d6aaa
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_case_cgo.txt
@@ -0,0 +1,11 @@
+[!cgo] skip
+
+env GO111MODULE=on
+
+go get -d rsc.io/CGO
+[short] stop
+
+go build rsc.io/CGO
+
+-- go.mod --
+module x
diff --git a/src/cmd/go/testdata/script/mod_clean_cache.txt b/src/cmd/go/testdata/script/mod_clean_cache.txt
new file mode 100644
index 0000000..01fbc38
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_clean_cache.txt
@@ -0,0 +1,58 @@
+env GO111MODULE=on
+
+# 'mod download' should download the module to the cache.
+go mod download rsc.io/quote@v1.5.0
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.zip
+
+# '-n' should print commands but not actually execute them.
+go clean -modcache -n
+stdout '^rm -rf .*pkg.mod$'
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.zip
+
+# 'go clean -modcache' should actually delete the files.
+go clean -modcache
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.info
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.mod
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.zip
+
+# 'go clean -r -modcache' should clean only the dependencies that are within the
+# main module.
+# BUG(golang.org/issue/28680): Today, it cleans across module boundaries.
+cd r
+exists ./test.out
+exists ../replaced/test.out
+go clean -r -modcache
+! exists ./test.out
+! exists ../replaced/test.out  # BUG: should still exist
+
+# 'go clean -modcache' should not download anything before cleaning.
+go mod edit -require rsc.io/quote@v1.99999999.0-not-a-real-version
+go clean -modcache
+! stderr 'finding rsc.io'
+go mod edit -droprequire rsc.io/quote
+
+-- go.mod --
+module m
+-- m.go --
+package m
+
+-- r/go.mod --
+module example.com/r
+require example.com/r/replaced v0.0.0
+replace example.com/r/replaced => ../replaced
+-- r/r.go --
+package r
+import _ "example.com/r/replaced"
+-- r/test.out --
+DELETE ME
+
+-- replaced/go.mod --
+module example.com/r/replaced
+-- replaced/replaced.go --
+package replaced
+-- replaced/test.out --
+DO NOT DELETE
diff --git a/src/cmd/go/testdata/script/mod_concurrent.txt b/src/cmd/go/testdata/script/mod_concurrent.txt
new file mode 100644
index 0000000..8c21525
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_concurrent.txt
@@ -0,0 +1,32 @@
+env GO111MODULE=on
+
+# Concurrent builds should succeed, even if they need to download modules.
+go get -d ./x ./y
+go build ./x &
+go build ./y
+wait
+
+# Concurrent builds should update go.sum to the union of the hashes for the
+# modules they read.
+cmp go.sum go.sum.want
+
+-- go.mod --
+module golang.org/issue/26794
+
+require (
+	golang.org/x/text v0.3.0
+	rsc.io/sampler v1.0.0
+)
+-- x/x.go --
+package x
+
+import _ "golang.org/x/text/language"
+-- y/y.go --
+package y
+
+import _ "rsc.io/sampler"
+-- go.sum.want --
+golang.org/x/text v0.3.0 h1:ivTorhoiROmZ1mcs15mO2czVF0uy0tnezXpBVNzgrmA=
+golang.org/x/text v0.3.0/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/sampler v1.0.0 h1:SRJnjyQ07sAtq6G4RcfJEmz8JxqLyj3PoGXG2VhbDWo=
+rsc.io/sampler v1.0.0/go.mod h1:cqxpM3ZVz9VtirqxZPmrWzkQ+UkiNiGtkrN+B+i8kx8=
diff --git a/src/cmd/go/testdata/script/mod_convert_dep.txt b/src/cmd/go/testdata/script/mod_convert_dep.txt
new file mode 100644
index 0000000..875a836
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_dep.txt
@@ -0,0 +1,30 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found Gopkg.lock in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+# In Plan 9, directories are automatically created in /n.
+# For example, /n/Gopkg.lock always exists, but it's a directory.
+# Test that we ignore directories when trying to find alternate config files.
+cd $WORK/gopkgdir/x
+! go list .
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! stderr 'Gopkg.lock'
+
+-- $WORK/test/Gopkg.lock --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
+-- $WORK/gopkgdir/Gopkg.lock/README.txt --
+../Gopkg.lock is a directory, not a file.
+-- $WORK/gopkgdir/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_git.txt b/src/cmd/go/testdata/script/mod_convert_git.txt
new file mode 100644
index 0000000..6ff1eb5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_git.txt
@@ -0,0 +1,40 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found .git/config in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+# We should not suggest creating a go.mod file in $GOROOT, even though there may be a .git/config there.
+cd $GOROOT
+! go list .
+! stderr 'go mod init'
+
+# We should also not suggest creating a go.mod file in $GOROOT if its own
+# .git/config has been stripped away and we find one in a parent directory.
+# (https://golang.org/issue/34191)
+env GOROOT=$WORK/parent/goroot
+cd $GOROOT
+! go list .
+! stderr 'go mod init'
+
+cd $GOROOT/doc
+! go list .
+! stderr 'go mod init'
+
+-- $WORK/test/.git/config --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
+-- $WORK/parent/.git/config --
+-- $WORK/parent/goroot/README --
+This directory isn't really a GOROOT, but let's pretend that it is.
+-- $WORK/parent/goroot/doc/README --
+This is a subdirectory of our fake GOROOT.
diff --git a/src/cmd/go/testdata/script/mod_convert_glide.txt b/src/cmd/go/testdata/script/mod_convert_glide.txt
new file mode 100644
index 0000000..9f1fff5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_glide.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found glide.lock in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/glide.lock --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_glockfile.txt b/src/cmd/go/testdata/script/mod_convert_glockfile.txt
new file mode 100644
index 0000000..6aa0794
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_glockfile.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found GLOCKFILE in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/GLOCKFILE --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_godeps.txt b/src/cmd/go/testdata/script/mod_convert_godeps.txt
new file mode 100644
index 0000000..da7b6c1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_godeps.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found Godeps/Godeps.json in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/Godeps/Godeps.json --
+{}
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_tsv.txt b/src/cmd/go/testdata/script/mod_convert_tsv.txt
new file mode 100644
index 0000000..6015ac8
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_tsv.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found dependencies.tsv in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/dependencies.tsv --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_tsv_insecure.txt b/src/cmd/go/testdata/script/mod_convert_tsv_insecure.txt
new file mode 100644
index 0000000..ddb0c08
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_tsv_insecure.txt
@@ -0,0 +1,27 @@
+env GO111MODULE=on
+
+[!net] skip
+[!exec:git] skip
+
+# secure fetch should report insecure warning
+cd $WORK/test
+go mod init
+stderr 'redirected .* to insecure URL'
+
+# insecure fetch should not
+env GOINSECURE=*.golang.org
+rm go.mod
+go mod init
+! stderr 'redirected .* to insecure URL'
+
+# insecure fetch invalid path should report insecure warning
+env GOINSECURE=foo.golang.org
+rm go.mod
+go mod init
+stderr 'redirected .* to insecure URL'
+
+-- $WORK/test/dependencies.tsv --
+vcs-test.golang.org/insecure/go/insecure	git	6fecd21f7c0c	2019-09-04T18:39:48Z 
+
+-- $WORK/test/x.go --
+package x // import "m"
diff --git a/src/cmd/go/testdata/script/mod_convert_vendor_conf.txt b/src/cmd/go/testdata/script/mod_convert_vendor_conf.txt
new file mode 100644
index 0000000..57ec419
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_vendor_conf.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found vendor.conf in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/vendor.conf --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_vendor_json.txt b/src/cmd/go/testdata/script/mod_convert_vendor_json.txt
new file mode 100644
index 0000000..df6db36
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_vendor_json.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found vendor/vendor.json in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m
+stdout '^m$'
+
+-- $WORK/test/vendor/vendor.json --
+{}
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_vendor_manifest.txt b/src/cmd/go/testdata/script/mod_convert_vendor_manifest.txt
new file mode 100644
index 0000000..8b6a141
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_vendor_manifest.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found vendor/manifest in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m
+stdout '^m$'
+
+-- $WORK/test/vendor/manifest --
+{}
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_convert_vendor_yml.txt b/src/cmd/go/testdata/script/mod_convert_vendor_yml.txt
new file mode 100644
index 0000000..4ed140a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_convert_vendor_yml.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# We should not create a go.mod file unless the user ran 'go mod init' explicitly.
+# However, we should suggest 'go mod init' if we can find an alternate config file.
+cd $WORK/test/x
+! go list .
+stderr 'found vendor.yml in .*[/\\]test'
+stderr '\s*cd \.\. && go mod init'
+
+# The command we suggested should succeed.
+cd ..
+go mod init
+go list -m all
+stdout '^m$'
+
+-- $WORK/test/vendor.yml --
+-- $WORK/test/x/x.go --
+package x // import "m/x"
diff --git a/src/cmd/go/testdata/script/mod_dir.txt b/src/cmd/go/testdata/script/mod_dir.txt
new file mode 100644
index 0000000..05548f6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_dir.txt
@@ -0,0 +1,20 @@
+# The directory named go.mod should be ignored
+
+env GO111MODULE=on
+
+cd $WORK/sub
+
+go list .
+stdout 'x/sub'
+
+mkdir go.mod
+exists go.mod
+
+go list .
+stdout 'x/sub'
+
+-- $WORK/go.mod --
+module x
+
+-- $WORK/sub/x.go --
+package x
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/mod_doc.txt b/src/cmd/go/testdata/script/mod_doc.txt
new file mode 100644
index 0000000..595ad67
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_doc.txt
@@ -0,0 +1,89 @@
+# go doc should find module documentation
+
+env GO111MODULE=on
+env GOFLAGS=-mod=mod
+[short] skip
+
+# Check when module x is inside GOPATH/src.
+go doc y
+stdout 'Package y is.*alphabet'
+stdout 'import "x/y"'
+go doc x/y
+stdout 'Package y is.*alphabet'
+! go doc quote.Hello
+stderr 'doc: symbol quote is not a type' # because quote is not in local cache
+go list rsc.io/quote # now it is
+go doc quote.Hello
+stdout 'Hello returns a greeting'
+go doc quote
+stdout 'Package quote collects pithy sayings.'
+
+# Double-check when module x is outside GOPATH/src.
+env GOPATH=$WORK/emptygopath
+go doc x/y
+stdout 'Package y is.*alphabet'
+go doc y
+stdout 'Package y is.*alphabet'
+
+# Triple-check when module x is outside GOPATH/src,
+# but other packages with same import paths are in GOPATH/src.
+# Since go doc is running in module mode here, packages in active module
+# should be preferred over packages in GOPATH. See golang.org/issue/28992.
+env GOPATH=$WORK/gopath2
+go doc x/y
+! stdout 'Package y is.*GOPATH'
+stdout 'Package y is.*alphabet'
+go doc rsc.io/quote
+! stdout 'Package quote is located in a GOPATH workspace.'
+stdout 'Package quote collects pithy sayings.'
+
+# Check that a sensible error message is printed when a package is not found.
+env GOPROXY=off
+! go doc example.com/hello
+stderr '^doc: cannot find module providing package example.com/hello: module lookup disabled by GOPROXY=off$'
+
+# When in a module with a vendor directory, doc should use the vendored copies
+# of the packages. 'std' and 'cmd' are convenient examples of such modules.
+#
+# When in those modules, the "// import" comment should refer to the same import
+# path used in source code, not to the absolute path relative to GOROOT.
+
+cd $GOROOT/src
+env GOFLAGS=
+go doc cryptobyte
+stdout '// import "golang.org/x/crypto/cryptobyte"'
+
+cd $GOROOT/src/cmd/go
+go doc modfile
+stdout '// import "golang.org/x/mod/modfile"'
+
+# When outside of the 'std' module, its vendored packages
+# remain accessible using the 'vendor/' prefix, but report
+# the correct "// import" comment as used within std.
+cd $GOPATH
+go doc vendor/golang.org/x/crypto/cryptobyte
+stdout '// import "vendor/golang.org/x/crypto/cryptobyte"'
+
+go doc cmd/vendor/golang.org/x/mod/modfile
+stdout '// import "cmd/vendor/golang.org/x/mod/modfile"'
+
+-- go.mod --
+module x
+require rsc.io/quote v1.5.2
+
+-- y/y.go --
+// Package y is the next to last package of the alphabet.
+package y
+
+-- x.go --
+package x
+
+-- $WORK/gopath2/src/x/y/y.go --
+// Package y is located in a GOPATH workspace.
+package y
+-- $WORK/gopath2/src/rsc.io/quote/quote.go --
+// Package quote is located in a GOPATH workspace.
+package quote
+
+// Hello is located in a GOPATH workspace.
+func Hello() string { return "" }
diff --git a/src/cmd/go/testdata/script/mod_domain_root.txt b/src/cmd/go/testdata/script/mod_domain_root.txt
new file mode 100644
index 0000000..14745b5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_domain_root.txt
@@ -0,0 +1,12 @@
+# Module paths that are domain roots should resolve.
+# (example.com not example.com/something)
+
+env GO111MODULE=on
+go get -d
+
+-- go.mod --
+module x
+
+-- x.go --
+package x
+import _ "example.com"
diff --git a/src/cmd/go/testdata/script/mod_dot.txt b/src/cmd/go/testdata/script/mod_dot.txt
new file mode 100644
index 0000000..ca8d5c6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_dot.txt
@@ -0,0 +1,131 @@
+env GO111MODULE=on
+
+# golang.org/issue/32917 and golang.org/issue/28459: 'go build' and 'go test'
+# in an empty directory should refer to the path '.' and should not attempt
+# to resolve an external module.
+cd dir
+! go get
+stderr '^go get: no package in current directory$'
+! go get .
+stderr '^go get \.: no package in current directory$'
+! go get ./subdir
+stderr '^go get: \.[/\\]subdir \('$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]subdir\) is not a package in module rooted at '$WORK'[/\\]gopath[/\\]src[/\\]dir$'
+! go list
+! stderr 'cannot find module providing package'
+stderr '^no Go files in '$WORK'[/\\]gopath[/\\]src[/\\]dir$'
+
+cd subdir
+! go list
+! stderr 'cannot find module providing package'
+stderr '^no Go files in '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]subdir$'
+cd ..
+
+# golang.org/issue/30590: if a package is found in the filesystem
+# but is not in the main module, the error message should not say
+# "cannot find module providing package", and we shouldn't try
+# to find a module providing the package.
+! go list ./othermodule
+! stderr 'cannot find module providing package'
+stderr '^main module \(example\.com\) does not contain package example.com/othermodule$'
+
+# golang.org/issue/27122: 'go build' of a nonexistent directory should produce
+# a helpful "no Go files" error message, not a generic "unknown import path".
+! go list ./subdir
+stderr '^no Go files in '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]subdir$'
+
+# golang.org/issue/29280: 'go list -e' for a nonexistent directory should
+# report a nonexistent package with an error.
+go list -e -json ./subdir
+stdout '"Incomplete": true'
+
+# golang.org/issue/28155: 'go list ./testdata' should not synthesize underscores.
+go list ./testdata
+stdout '^example.com/testdata'
+
+# golang.org/issue/32921: vendor directories should only be accepted as directories
+# if the directory would actually be used to load the package.
+! go list ./vendor/nonexist
+stderr '^no Go files in '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]vendor[/\\]nonexist$'
+
+! go list ./vendor/pkg
+stderr '^without -mod=vendor, directory '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]vendor[/\\]pkg has no package path$'
+
+! go list -mod=vendor ./vendor/nonexist
+stderr '^no Go files in '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]vendor[/\\]nonexist$'
+
+! go list -mod=vendor ./vendor/unlisted
+stderr '^directory '$WORK'[/\\]gopath[/\\]src[/\\]dir[/\\]vendor[/\\]unlisted is not a package listed in vendor/modules.txt$'
+
+go list -mod=vendor ./vendor/pkg
+stdout '^pkg$'
+
+# Packages within GOROOT should resolve as in any other module,
+# except that -mod=vendor is implied by default.
+cd $GOROOT/src
+! go list .
+stderr '^no Go files in '$GOROOT'[/\\]src$'
+
+! go list ./builtin
+stderr '^"builtin" is a pseudo-package, not an importable package$'
+
+! go list ./debug
+! stderr 'cannot find module providing package'
+stderr '^no Go files in '$GOROOT'[/\\]src[/\\]debug$'
+
+! go list ./golang.org/x/tools/cmd/goimports
+! stderr 'cannot find module providing package'
+stderr '^stat '$GOROOT'[/\\]src[/\\]golang.org[/\\]x[/\\]tools[/\\]cmd[/\\]goimports: directory not found'
+
+go list ./vendor/golang.org/x/net/http2/hpack
+stdout '^golang.org/x/net/http2/hpack$'
+
+# golang.org/issue/30756: packages in other GOROOTs should not get the special
+# prefixless treatment of GOROOT itself.
+cd $WORK/othergoroot/src
+! go list .
+stderr '^no Go files in '$WORK'[/\\]othergoroot[/\\]src$'
+
+go list ./builtin
+stdout '^std/builtin$'  # Only the "std" in actual $GOROOT is special, and only its "builtin" is special.
+
+! go list ./bytes
+! stderr 'cannot find module providing package'
+stderr '^no Go files in '$WORK'[/\\]othergoroot[/\\]src[/\\]bytes$'
+
+! go list ./vendor/golang.org/x/net/http2/hpack
+stderr '^without -mod=vendor, directory '$WORK'[/\\]othergoroot[/\\]src[/\\]vendor[/\\]golang.org[/\\]x[/\\]net[/\\]http2[/\\]hpack has no package path$'
+
+-- dir/go.mod --
+module example.com
+go 1.13
+-- dir/subdir/README --
+There are no Go source files in this directory.
+-- dir/othermodule/go.mod --
+module example.com/othermodule
+go 1.13
+-- dir/othermodule/om.go --
+package othermodule
+-- dir/testdata/td.go --
+package testdata
+-- dir/vendor/modules.txt --
+# pkg v0.0.0
+pkg
+-- dir/vendor/nonexist/README --
+There are no Go source files here either.
+-- dir/vendor/pkg/pkg.go --
+package pkg
+-- dir/vendor/unlisted/unlisted.go --
+package unlisted
+-- emptyroot/go.mod --
+module example.com/emptyroot
+-- emptyroot/pkg/pkg.go --
+package pkg
+-- $WORK/othergoroot/src/go.mod --
+module std
+go 1.13
+-- $WORK/othergoroot/src/builtin/builtin.go --
+package builtin
+-- $WORK/othergoroot/src/bytes/README --
+There are no Go source files in this directory.
+-- $WORK/othergoroot/src/vendor/golang.org/x/net/http2/hpack --
+package hpack
diff --git a/src/cmd/go/testdata/script/mod_download.txt b/src/cmd/go/testdata/script/mod_download.txt
new file mode 100644
index 0000000..c2b72b2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download.txt
@@ -0,0 +1,170 @@
+env GO111MODULE=on
+
+# download with version should print nothing.
+# It should not load retractions from the .mod file from the latest version.
+go mod download rsc.io/quote@v1.5.0
+! stdout .
+! stderr .
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.0.zip
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.info
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
+
+# download of an invalid path should report the error
+[short] skip
+! go mod download this.domain.is.invalid/somemodule@v1.0.0
+stderr 'this.domain.is.invalid'
+! go mod download -json this.domain.is.invalid/somemodule@v1.0.0
+stdout '"Error": ".*this.domain.is.invalid.*"'
+
+# download -json with version should print JSON
+go mod download -json 'rsc.io/quote@<=v1.5.0'
+stdout '^\t"Path": "rsc.io/quote"'
+stdout '^\t"Version": "v1.5.0"'
+stdout '^\t"Info": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.info"'
+stdout '^\t"GoMod": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.mod"'
+stdout '^\t"Zip": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.0.zip"'
+stdout '^\t"Sum": "h1:6fJa6E\+wGadANKkUMlZ0DhXFpoKlslOQDCo259XtdIE="'  # hash of testdata/mod version, not real version!
+stdout '^\t"GoModSum": "h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe\+TKr0="'
+! stdout '"Error"'
+
+# download queries above should not have added to go.mod.
+go list -m all
+! stdout rsc.io
+
+# download query should have downloaded go.mod for the highest release version
+# in order to find retractions when resolving the query '@<=v1.5.0'.
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+
+# add to go.mod so we can test non-query downloads
+go mod edit -require rsc.io/quote@v1.5.3-pre1
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
+
+# module loading will page in the info and mod files
+go list -m -mod=mod all
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
+
+# download will fetch and unpack the zip file
+go mod download
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
+exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1
+
+# download repopulates deleted files and directories independently.
+rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
+go mod download
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.info
+rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
+go mod download
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.mod
+rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
+go mod download
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-pre1.zip
+rm -r $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1
+go mod download
+exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.3-pre1
+
+# download reports the locations of downloaded files
+go mod download -json
+stdout '^\t"Path": "rsc.io/quote"'
+stdout '^\t"Version": "v1.5.3-pre1"'
+stdout '^\t"Info": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.info"'
+stdout '^\t"GoMod": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.mod"'
+stdout '^\t"Zip": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)cache(\\\\|/)download(\\\\|/)rsc.io(\\\\|/)quote(\\\\|/)@v(\\\\|/)v1.5.3-pre1.zip"'
+stdout '^\t"Dir": ".*(\\\\|/)pkg(\\\\|/)mod(\\\\|/)rsc.io(\\\\|/)quote@v1.5.3-pre1"'
+
+# download will follow replacements
+go mod edit -require rsc.io/quote@v1.5.1 -replace rsc.io/quote@v1.5.1=rsc.io/quote@v1.5.2
+go mod download
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.1.zip
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+
+# download will not follow replacements for explicit module queries
+go mod download -json rsc.io/quote@v1.5.1
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.1.zip
+
+# download reports errors encountered when locating modules
+! go mod download bad/path
+stderr '^go mod download: module bad/path: not a known dependency$'
+! go mod download bad/path@latest
+stderr '^go mod download: bad/path@latest: malformed module path "bad/path": missing dot in first path element$'
+! go mod download rsc.io/quote@v1.999.999
+stderr '^go mod download: rsc.io/quote@v1.999.999: reading .*/v1.999.999.info: 404 Not Found$'
+! go mod download -json bad/path
+stdout '^\t"Error": "module bad/path: not a known dependency"'
+
+# download main module produces a warning or error
+go mod download m
+stderr '^go mod download: skipping argument m that resolves to the main module\n'
+! go mod download m@latest
+stderr '^go mod download: m@latest: malformed module path "m": missing dot in first path element$'
+
+# download without arguments updates go.mod and go.sum after loading the
+# build list, but does not save sums for downloaded zips.
+cd update
+cp go.mod.orig go.mod
+! exists go.sum
+go mod download
+cmp go.mod.update go.mod
+cmp go.sum.update go.sum
+cp go.mod.orig go.mod
+rm go.sum
+
+# download with arguments (even "all") does update go.mod and go.sum.
+go mod download rsc.io/sampler
+cmp go.mod.update go.mod
+grep '^rsc.io/sampler v1.3.0 ' go.sum
+cp go.mod.orig go.mod
+rm go.sum
+
+go mod download all
+cmp go.mod.update go.mod
+grep '^rsc.io/sampler v1.3.0 ' go.sum
+cd ..
+
+# allow go mod download without go.mod
+env GO111MODULE=auto
+rm go.mod
+rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.2.1.zip
+go mod download rsc.io/quote@v1.2.1
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.2.1.zip
+
+# download -x with version should print
+# the underlying commands such as contacting GOPROXY.
+go mod download -x rsc.io/quote@v1.0.0
+! stdout .
+stderr 'get '$GOPROXY
+
+-- go.mod --
+module m
+
+-- update/go.mod.orig --
+module m
+
+go 1.16
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.2.1 // older version than in build list
+)
+-- update/go.mod.update --
+module m
+
+go 1.16
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.3.0 // older version than in build list
+)
+-- update/go.sum.update --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/src/cmd/go/testdata/script/mod_download_concurrent_read.txt b/src/cmd/go/testdata/script/mod_download_concurrent_read.txt
new file mode 100644
index 0000000..231babd
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download_concurrent_read.txt
@@ -0,0 +1,110 @@
+# This test simulates a process watching for changes and reading files in
+# module cache as a module is extracted.
+#
+# Before Go 1.16, we extracted each module zip to a temporary directory with
+# a random name, then renamed that into place with os.Rename. On Windows,
+# this failed with ERROR_ACCESS_DENIED when another process (usually an
+# anti-virus scanner) opened files in the temporary directory. This test
+# simulates that behavior, verifying golang.org/issue/36568.
+#
+# Since 1.16, we extract to the final directory, but we create a .partial file
+# so that if we crash, other processes know the directory is incomplete.
+
+[!windows] skip
+[short] skip
+
+go run downloader.go
+
+-- go.mod --
+module example.com/m
+
+go 1.14
+
+-- downloader.go --
+package main
+
+import (
+	"fmt"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func main() {
+	if err := run(); err != nil {
+		log.Fatal(err)
+	}
+}
+
+// run repeatedly downloads a module while opening files in the module cache
+// in a background goroutine.
+//
+// run uses a different temporary module cache in each iteration so that we
+// don't need to clean the cache or synchronize closing files after each
+// iteration.
+func run() (err error) {
+	tmpDir, err := os.MkdirTemp("", "")
+	if err != nil {
+		return err
+	}
+	defer func() {
+		if rmErr := os.RemoveAll(tmpDir); err == nil && rmErr != nil {
+			err = rmErr
+		}
+	}()
+	for i := 0; i < 10; i++ {
+    gopath := filepath.Join(tmpDir, fmt.Sprintf("gopath%d", i))
+		var err error
+		done := make(chan struct{})
+		go func() {
+			err = download(gopath)
+			close(done)
+		}()
+		readCache(gopath, done)
+		if err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+// download downloads a module into the given cache using 'go mod download'.
+func download(gopath string) error {
+	cmd := exec.Command("go", "mod", "download", "-modcacherw", "rsc.io/quote@v1.5.2")
+	cmd.Stderr = os.Stderr
+	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
+	return cmd.Run()
+}
+
+// readCache repeatedly globs for go.mod files in the given cache, then opens
+// those files for reading. When the done chan is closed, readCache closes
+// files and returns.
+func readCache(gopath string, done <-chan struct{}) {
+	files := make(map[string]*os.File)
+	defer func() {
+		for _, f := range files {
+			f.Close()
+		}
+	}()
+
+	pattern := filepath.Join(gopath, "pkg/mod/rsc.io/quote@v1.5.2*/go.mod")
+	for {
+		select {
+		case <-done:
+			return
+		default:
+		}
+
+		names, _ := filepath.Glob(pattern)
+		for _, name := range names {
+			if files[name] != nil {
+				continue
+			}
+			f, _ := os.Open(name)
+			if f != nil {
+				files[name] = f
+			}
+		}
+	}
+}
diff --git a/src/cmd/go/testdata/script/mod_download_hash.txt b/src/cmd/go/testdata/script/mod_download_hash.txt
new file mode 100644
index 0000000..5a42c4b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download_hash.txt
@@ -0,0 +1,24 @@
+env GO111MODULE=on
+
+# Testing mod download with non semantic versions; turn off proxy.
+[!net] skip
+[!exec:git] skip
+env GOPROXY=direct
+env GOSUMDB=off
+
+go mod download rsc.io/quote@a91498bed0a73d4bb9c1fb2597925f7883bc40a7
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.zip
+
+go mod download rsc.io/quote@master
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.info
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.mod
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.3-0.20180709162918-a91498bed0a7.zip
+
+
+-- go.mod --
+module m
+
+-- m.go --
+package m
diff --git a/src/cmd/go/testdata/script/mod_download_json.txt b/src/cmd/go/testdata/script/mod_download_json.txt
new file mode 100644
index 0000000..9555adf
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download_json.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=on
+env GOSUMDB=$sumdb' '$proxy/sumdb-wrong
+
+# download -json with version should print JSON on sumdb failure
+! go mod download -json 'rsc.io/quote@<=v1.5.0'
+stdout '"Error": ".*verifying (module|go.mod)'
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_download_partial.txt b/src/cmd/go/testdata/script/mod_download_partial.txt
new file mode 100644
index 0000000..0aab60d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download_partial.txt
@@ -0,0 +1,68 @@
+# Download modules and populate go.sum.
+go get -d -modcacherw
+exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+
+# 'go mod verify' should fail if we delete a file.
+go mod verify
+rm $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+! go mod verify
+
+# Create a .partial file to simulate an failure extracting the zip file.
+cp empty $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.partial
+
+# 'go mod verify' should not fail, since the module hasn't been completely
+# ingested into the cache.
+go mod verify
+
+# 'go list' should not load packages from the directory.
+# NOTE: the message "directory $dir outside available modules" is reported
+# for directories not in the main module, active modules in the module cache,
+# or local replacements. In this case, the directory is in the right place,
+# but it's incomplete, so 'go list' acts as if it's not an active module.
+! go list $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+stderr 'outside available modules'
+
+# 'go list -m' should not print the directory.
+go list -m -f '{{.Dir}}' rsc.io/quote
+! stdout .
+
+# 'go mod download' should re-extract the module and remove the .partial file.
+go mod download -modcacherw rsc.io/quote
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.partial
+exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+
+# 'go list' should succeed.
+go list $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+stdout '^rsc.io/quote$'
+
+# 'go list -m' should print the directory.
+go list -m -f '{{.Dir}}' rsc.io/quote
+stdout 'pkg[/\\]mod[/\\]rsc.io[/\\]quote@v1.5.2'
+
+# go mod verify should fail if we delete a file.
+go mod verify
+rm $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/go.mod
+! go mod verify
+
+# 'go mod download' should not leave behind a directory or a .partial file
+# if there is an error extracting the zip file.
+rm $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+cp empty $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+! go mod download
+stderr 'not a valid zip file'
+! exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.partial
+
+-- go.mod --
+module m
+
+go 1.14
+
+require rsc.io/quote v1.5.2
+
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+
+-- empty --
diff --git a/src/cmd/go/testdata/script/mod_download_replace_file.txt b/src/cmd/go/testdata/script/mod_download_replace_file.txt
new file mode 100644
index 0000000..f6ab4fe
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_download_replace_file.txt
@@ -0,0 +1,16 @@
+# This test checks that 'go mod download' produces no output for
+# the main module (when specified implicitly) and for a module replaced
+# with a file path.
+# Verifies golang.org/issue/35505.
+go mod download -json all
+cmp stdout no-output
+
+-- go.mod --
+module example.com/a
+
+require example.com/b v1.0.0
+
+replace example.com/b => ./local/b
+-- local/b/go.mod --
+module example.com/b
+-- no-output --
diff --git a/src/cmd/go/testdata/script/mod_e.txt b/src/cmd/go/testdata/script/mod_e.txt
new file mode 100644
index 0000000..3a0d18d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_e.txt
@@ -0,0 +1,89 @@
+cp go.mod go.mod.orig
+
+
+# If a dependency cannot be resolved, 'go mod tidy' fails with an error message
+# explaining the problem and does not update the go.mod file.
+# TODO(bcmills): Ideally, with less redundancy than these error messages!
+
+! go mod tidy
+
+stderr '^example.com/untidy imports\n\texample.net/directnotfound: cannot find module providing package example.net/directnotfound: module example.net/directnotfound: reading http://.*: 404 Not Found$'
+
+stderr '^example.com/untidy imports\n\texample.net/m imports\n\texample.net/indirectnotfound: cannot find module providing package example.net/indirectnotfound: module example.net/indirectnotfound: reading http://.*: 404 Not Found$'
+
+stderr '^example.com/untidy tested by\n\texample.com/untidy.test imports\n\texample.net/directtestnotfound: cannot find module providing package example.net/directtestnotfound: module example.net/directtestnotfound: reading http://.*: 404 Not Found$'
+
+stderr '^example.com/untidy imports\n\texample.net/m tested by\n\texample.net/m.test imports\n\texample.net/indirecttestnotfound: cannot find module providing package example.net/indirecttestnotfound: module example.net/indirecttestnotfound: reading http://.*: 404 Not Found$'
+
+cmp go.mod.orig go.mod
+
+
+# If a dependency cannot be resolved, 'go mod vendor' fails with an error message
+# explaining the problem, does not update the go.mod file, and does not create
+# the vendor directory.
+
+! go mod vendor
+
+stderr '^example.com/untidy imports\n\texample.net/directnotfound: cannot find module providing package example.net/directnotfound: module example.net/directnotfound: reading http://.*: 404 Not Found$'
+
+stderr '^example.com/untidy imports\n\texample.net/m imports\n\texample.net/indirectnotfound: cannot find module providing package example.net/indirectnotfound: module example.net/indirectnotfound: reading http://.*: 404 Not Found$'
+
+stderr '^example.com/untidy tested by\n\texample.com/untidy.test imports\n\texample.net/directtestnotfound: cannot find module providing package example.net/directtestnotfound: module example.net/directtestnotfound: reading http://.*: 404 Not Found$'
+
+! stderr 'indirecttestnotfound'  # Vendor prunes test dependencies.
+
+cmp go.mod.orig go.mod
+! exists vendor
+
+
+# 'go mod tidy' still logs the errors, but succeeds and updates go.mod.
+
+go mod tidy -e
+stderr -count=4 'cannot find module providing package'
+cmp go.mod.final go.mod
+
+
+# 'go mod vendor -e' still logs the errors, but succeeds and updates go.mod.
+
+cp go.mod.orig go.mod
+go mod vendor -e
+stderr -count=3 'cannot find module providing package'
+cmp go.mod.final go.mod
+exists vendor/modules.txt
+exists vendor/example.net/m/m.go
+
+
+-- go.mod --
+module example.com/untidy
+go 1.16
+replace example.net/m v0.1.0 => ./m
+-- go.mod.final --
+module example.com/untidy
+
+go 1.16
+
+replace example.net/m v0.1.0 => ./m
+
+require example.net/m v0.1.0
+-- untidy.go --
+package untidy
+
+import (
+	_ "example.net/m"
+	_ "example.net/directnotfound"
+)
+-- untidy_test.go --
+package untidy_test
+
+import _ "example.net/directtestnotfound"
+-- m/go.mod --
+module example.net/m
+go 1.16
+-- m/m.go --
+package m
+
+import _ "example.net/indirectnotfound"
+-- m/m_test.go --
+package m_test
+
+import _ "example.net/indirecttestnotfound"
diff --git a/src/cmd/go/testdata/script/mod_edit.txt b/src/cmd/go/testdata/script/mod_edit.txt
new file mode 100644
index 0000000..9da6930
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_edit.txt
@@ -0,0 +1,303 @@
+env GO111MODULE=on
+
+# Test that go mod edits and related mod flags work.
+# Also test that they can use a dummy name that isn't resolvable. golang.org/issue/24100
+
+# go mod init
+! go mod init
+stderr 'cannot determine module path'
+! exists go.mod
+
+go mod init x.x/y/z
+stderr 'creating new go.mod: module x.x/y/z'
+cmpenv go.mod $WORK/go.mod.init
+
+! go mod init
+cmpenv go.mod $WORK/go.mod.init
+
+# go mod edits
+go mod edit -droprequire=x.1 -require=x.1@v1.0.0 -require=x.2@v1.1.0 -droprequire=x.2 -exclude='x.1 @ v1.2.0' -exclude=x.1@v1.2.1 -exclude=x.1@v2.0.0+incompatible -replace=x.1@v1.3.0=y.1@v1.4.0 -replace='x.1@v1.4.0 = ../z' -retract=v1.6.0 -retract=[v1.1.0,v1.2.0] -retract=[v1.3.0,v1.4.0] -retract=v1.0.0
+cmpenv go.mod $WORK/go.mod.edit1
+go mod edit -droprequire=x.1 -dropexclude=x.1@v1.2.1 -dropexclude=x.1@v2.0.0+incompatible -dropreplace=x.1@v1.3.0 -require=x.3@v1.99.0 -dropretract=v1.0.0 -dropretract=[v1.1.0,v1.2.0]
+cmpenv go.mod $WORK/go.mod.edit2
+
+# -exclude and -retract reject invalid versions.
+! go mod edit -exclude=example.com/m@bad
+stderr '^go mod: -exclude=example.com/m@bad: version "bad" invalid: must be of the form v1.2.3$'
+! go mod edit -retract=bad
+stderr '^go mod: -retract=bad: version "bad" invalid: must be of the form v1.2.3$'
+
+! go mod edit -exclude=example.com/m@v2.0.0
+stderr '^go mod: -exclude=example.com/m@v2\.0\.0: version "v2\.0\.0" invalid: should be v2\.0\.0\+incompatible \(or module example\.com/m/v2\)$'
+
+! go mod edit -exclude=example.com/m/v2@v1.0.0
+stderr '^go mod: -exclude=example.com/m/v2@v1\.0\.0: version "v1\.0\.0" invalid: should be v2, not v1$'
+
+! go mod edit -exclude=gopkg.in/example.v1@v2.0.0
+stderr '^go mod: -exclude=gopkg\.in/example\.v1@v2\.0\.0: version "v2\.0\.0" invalid: should be v1, not v2$'
+
+cmpenv go.mod $WORK/go.mod.edit2
+
+# go mod edit -json
+go mod edit -json
+cmpenv stdout $WORK/go.mod.json
+
+# go mod edit -json (retractions with rationales)
+go mod edit -json $WORK/go.mod.retractrationale
+cmp stdout $WORK/go.mod.retractrationale.json
+
+# go mod edit -json (empty mod file)
+go mod edit -json $WORK/go.mod.empty
+cmp stdout $WORK/go.mod.empty.json
+
+# go mod edit -replace
+go mod edit -replace=x.1@v1.3.0=y.1/v2@v2.3.5 -replace=x.1@v1.4.0=y.1/v2@v2.3.5
+cmpenv go.mod $WORK/go.mod.edit3
+go mod edit -replace=x.1=y.1/v2@v2.3.6
+cmpenv go.mod $WORK/go.mod.edit4
+go mod edit -dropreplace=x.1
+cmpenv go.mod $WORK/go.mod.edit5
+
+# go mod edit -fmt
+cp $WORK/go.mod.badfmt go.mod
+go mod edit -fmt -print # -print should avoid writing file
+cmpenv stdout $WORK/go.mod.goodfmt
+cmp go.mod $WORK/go.mod.badfmt
+go mod edit -fmt # without -print, should write file (and nothing to stdout)
+! stdout .
+cmpenv go.mod $WORK/go.mod.goodfmt
+
+# go mod edit -module
+cd $WORK/m
+go mod init a.a/b/c
+go mod edit -module x.x/y/z
+cmpenv go.mod go.mod.edit
+
+# golang.org/issue/30513: don't require go-gettable module paths.
+cd $WORK/local
+go mod init foo
+go mod edit -module local-only -require=other-local@v1.0.0 -replace other-local@v1.0.0=./other
+cmpenv go.mod go.mod.edit
+
+-- x.go --
+package x
+
+-- w/w.go --
+package w
+
+-- $WORK/go.mod.init --
+module x.x/y/z
+
+go $goversion
+-- $WORK/go.mod.edit1 --
+module x.x/y/z
+
+go $goversion
+
+require x.1 v1.0.0
+
+exclude (
+	x.1 v1.2.0
+	x.1 v1.2.1
+	x.1 v2.0.0+incompatible
+)
+
+replace (
+	x.1 v1.3.0 => y.1 v1.4.0
+	x.1 v1.4.0 => ../z
+)
+
+retract (
+	v1.6.0
+	[v1.3.0, v1.4.0]
+	[v1.1.0, v1.2.0]
+	v1.0.0
+)
+-- $WORK/go.mod.edit2 --
+module x.x/y/z
+
+go $goversion
+
+exclude x.1 v1.2.0
+
+replace x.1 v1.4.0 => ../z
+
+retract (
+	v1.6.0
+	[v1.3.0, v1.4.0]
+)
+
+require x.3 v1.99.0
+-- $WORK/go.mod.json --
+{
+	"Module": {
+		"Path": "x.x/y/z"
+	},
+	"Go": "$goversion",
+	"Require": [
+		{
+			"Path": "x.3",
+			"Version": "v1.99.0"
+		}
+	],
+	"Exclude": [
+		{
+			"Path": "x.1",
+			"Version": "v1.2.0"
+		}
+	],
+	"Replace": [
+		{
+			"Old": {
+				"Path": "x.1",
+				"Version": "v1.4.0"
+			},
+			"New": {
+				"Path": "../z"
+			}
+		}
+	],
+	"Retract": [
+		{
+			"Low": "v1.6.0",
+			"High": "v1.6.0"
+		},
+		{
+			"Low": "v1.3.0",
+			"High": "v1.4.0"
+		}
+	]
+}
+-- $WORK/go.mod.edit3 --
+module x.x/y/z
+
+go $goversion
+
+exclude x.1 v1.2.0
+
+replace (
+	x.1 v1.3.0 => y.1/v2 v2.3.5
+	x.1 v1.4.0 => y.1/v2 v2.3.5
+)
+
+retract (
+	v1.6.0
+	[v1.3.0, v1.4.0]
+)
+
+require x.3 v1.99.0
+-- $WORK/go.mod.edit4 --
+module x.x/y/z
+
+go $goversion
+
+exclude x.1 v1.2.0
+
+replace x.1 => y.1/v2 v2.3.6
+
+retract (
+	v1.6.0
+	[v1.3.0, v1.4.0]
+)
+
+require x.3 v1.99.0
+-- $WORK/go.mod.edit5 --
+module x.x/y/z
+
+go $goversion
+
+exclude x.1 v1.2.0
+
+retract (
+	v1.6.0
+	[v1.3.0, v1.4.0]
+)
+
+require x.3 v1.99.0
+-- $WORK/local/go.mod.edit --
+module local-only
+
+go $goversion
+
+require other-local v1.0.0
+
+replace other-local v1.0.0 => ./other
+-- $WORK/go.mod.badfmt --
+module     x.x/y/z
+
+go 1.10
+
+exclude x.1     v1.2.0
+
+replace x.1    =>   y.1/v2 v2.3.6
+
+require x.3   v1.99.0
+
+retract [  "v1.8.1" , "v1.8.2" ]
+-- $WORK/go.mod.goodfmt --
+module x.x/y/z
+
+go 1.10
+
+exclude x.1 v1.2.0
+
+replace x.1 => y.1/v2 v2.3.6
+
+require x.3 v1.99.0
+
+retract [v1.8.1, v1.8.2]
+-- $WORK/m/go.mod.edit --
+module x.x/y/z
+
+go $goversion
+-- $WORK/go.mod.retractrationale --
+module x.x/y/z
+
+go 1.15
+
+// a
+retract v1.0.0
+
+// b
+retract (
+  v1.0.1
+  v1.0.2 // c
+)
+-- $WORK/go.mod.retractrationale.json --
+{
+	"Module": {
+		"Path": "x.x/y/z"
+	},
+	"Go": "1.15",
+	"Require": null,
+	"Exclude": null,
+	"Replace": null,
+	"Retract": [
+		{
+			"Low": "v1.0.0",
+			"High": "v1.0.0",
+			"Rationale": "a"
+		},
+		{
+			"Low": "v1.0.1",
+			"High": "v1.0.1",
+			"Rationale": "b"
+		},
+		{
+			"Low": "v1.0.2",
+			"High": "v1.0.2",
+			"Rationale": "c"
+		}
+	]
+}
+-- $WORK/go.mod.empty --
+-- $WORK/go.mod.empty.json --
+{
+	"Module": {
+		"Path": ""
+	},
+	"Require": null,
+	"Exclude": null,
+	"Replace": null,
+	"Retract": null
+}
diff --git a/src/cmd/go/testdata/script/mod_edit_go.txt b/src/cmd/go/testdata/script/mod_edit_go.txt
new file mode 100644
index 0000000..38321d0
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_edit_go.txt
@@ -0,0 +1,23 @@
+# Test support for go mod -edit to set language version.
+
+env GO111MODULE=on
+! go build
+stderr 'type aliases only supported as of'
+go mod edit -go=1.9
+grep 'go 1.9' go.mod
+go build
+
+# Reverting the version should force a rebuild and error instead of using
+# the cached 1.9 build. (https://golang.org/issue/37804)
+go mod edit -go=1.8
+! go build
+stderr 'type aliases only supported as of'
+
+
+-- go.mod --
+module m
+go 1.8
+
+-- alias.go --
+package alias
+type T = int
diff --git a/src/cmd/go/testdata/script/mod_empty_err.txt b/src/cmd/go/testdata/script/mod_empty_err.txt
new file mode 100644
index 0000000..982e6b2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_empty_err.txt
@@ -0,0 +1,36 @@
+# This test checks error messages for non-existant packages in module mode.
+# Veries golang.org/issue/35414
+env GO111MODULE=on
+cd $WORK
+
+go list -e -f {{.Error}} .
+stdout 'no Go files in \$WORK'
+
+go list -e -f {{.Error}} ./empty
+stdout 'no Go files in \$WORK[/\\]empty'
+
+go list -e -f {{.Error}} ./exclude
+stdout 'build constraints exclude all Go files in \$WORK[/\\]exclude'
+
+go list -e -f {{.Error}} ./missing
+stdout 'stat '$WORK'[/\\]missing: directory not found'
+
+# use 'go build -n' because 'go list' reports no error.
+! go build -n ./testonly
+stderr 'example.com/m/testonly: no non-test Go files in \$WORK[/\\]testonly'
+
+-- $WORK/go.mod --
+module example.com/m
+
+go 1.14
+
+-- $WORK/empty/empty.txt --
+-- $WORK/exclude/exclude.go --
+// +build exclude
+
+package exclude
+-- $WORK/testonly/testonly_test.go --
+package testonly_test
+-- $WORK/excluded-stdout --
+package ./excluded: cannot find package "." in:
+	$WORK/excluded
diff --git a/src/cmd/go/testdata/script/mod_enabled.txt b/src/cmd/go/testdata/script/mod_enabled.txt
new file mode 100644
index 0000000..39f1ece
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_enabled.txt
@@ -0,0 +1,93 @@
+# GO111MODULE=auto should trigger any time a go.mod exists in a parent directory.
+env GO111MODULE=auto
+
+cd $GOPATH/src/x/y/z
+go env GOMOD
+stdout $GOPATH[/\\]src[/\\]x[/\\]y[/\\]z[/\\]go.mod
+go list -m -f {{.GoMod}}
+stdout $GOPATH[/\\]src[/\\]x[/\\]y[/\\]z[/\\]go.mod
+
+cd $GOPATH/src/x/y/z/w
+go env GOMOD
+stdout $GOPATH[/\\]src[/\\]x[/\\]y[/\\]z[/\\]go.mod
+
+cd $GOPATH/src/x/y
+go env GOMOD
+! stdout .
+
+cd $GOPATH/foo
+go env GOMOD
+stdout foo[/\\]go.mod
+go list -m -f {{.GoMod}}
+stdout foo[/\\]go.mod
+
+cd $GOPATH/foo/bar/baz
+go env GOMOD
+stdout foo[/\\]go.mod
+
+# GO111MODULE unset should be equivalent to on.
+env GO111MODULE=
+
+cd $GOPATH/src/x/y/z
+go env GOMOD
+stdout $GOPATH[/\\]src[/\\]x[/\\]y[/\\]z[/\\]go.mod
+
+cd $GOPATH/src/x/y
+go env GOMOD
+stdout 'NUL|/dev/null'
+
+# GO111MODULE=on should trigger everywhere
+env GO111MODULE=on
+
+cd $GOPATH/src/x/y/z
+go env GOMOD
+stdout z[/\\]go.mod
+
+cd $GOPATH/src/x/y/z/w
+go env GOMOD
+stdout z[/\\]go.mod
+
+cd $GOPATH/src/x/y
+go env GOMOD
+stdout 'NUL|/dev/null'
+go list -m
+stdout '^command-line-arguments$'
+
+cd $GOPATH/foo
+go env GOMOD
+stdout foo[/\\]go.mod
+
+cd $GOPATH/foo/bar/baz
+go env GOMOD
+stdout foo[/\\]go.mod
+
+# GO111MODULE=off should trigger nowhere
+env GO111MODULE=off
+
+cd $GOPATH/src/x/y/z
+go env GOMOD
+! stdout .+
+
+cd $GOPATH/foo
+go env GOMOD
+! stdout .+
+
+cd $GOPATH/foo/bar/baz
+go env GOMOD
+! stdout .+
+
+# GO111MODULE=auto should ignore and warn about /tmp/go.mod
+env GO111MODULE=auto
+cp $GOPATH/src/x/y/z/go.mod $WORK/tmp/go.mod
+mkdir $WORK/tmp/mydir
+cd $WORK/tmp/mydir
+go env GOMOD
+! stdout .+
+stderr '^go: warning: ignoring go.mod in system temp root '
+
+-- $GOPATH/src/x/y/z/go.mod --
+module x/y/z
+-- $GOPATH/src/x/y/z/w/w.txt --
+-- $GOPATH/foo/go.mod --
+module example.com/mod
+-- $GOPATH/foo/bar/baz/quux.txt --
diff --git a/src/cmd/go/testdata/script/mod_file_proxy.txt b/src/cmd/go/testdata/script/mod_file_proxy.txt
new file mode 100644
index 0000000..38d9fd2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_file_proxy.txt
@@ -0,0 +1,36 @@
+[short] skip
+
+# Allow (cached) downloads for -mod=readonly.
+env GO111MODULE=on
+env GOPATH=$WORK/gopath1
+cd $WORK/x
+go mod edit -fmt
+go list -mod=readonly
+env GOPROXY=file:///nonexist
+go list
+grep v1.5.1 $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/list
+
+# Use download cache as file:/// proxy.
+env GOPATH=$WORK/gopath2
+[windows] env GOPROXY=file:///C:/nonexist
+[!windows] env GOPROXY=file:///nonexist
+! go list
+[windows] env GOPROXY=file:///$WORK/gopath1/pkg/mod/cache/download
+[!windows] env GOPROXY=file://$WORK/gopath1/pkg/mod/cache/download
+go list
+grep v1.5.1 $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/list
+
+-- $WORK/x/go.mod --
+module x
+go 1.13
+require rsc.io/quote v1.5.1
+-- $WORK/x/x.go --
+package x
+import _ "rsc.io/quote"
+-- $WORK/x/go.sum --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.1 h1:ZE3OgnVGrhXtFkGw90HwW992ZRqcdli/33DLqEYsoxA=
+rsc.io/quote v1.5.1/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/src/cmd/go/testdata/script/mod_find.txt b/src/cmd/go/testdata/script/mod_find.txt
new file mode 100644
index 0000000..1e01973
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_find.txt
@@ -0,0 +1,104 @@
+env GO111MODULE=on
+
+# Derive module path from import comment.
+cd $WORK/x
+exists x.go
+go mod init
+stderr 'module x'
+
+# Import comment works even with CRLF line endings.
+rm go.mod
+addcrlf x.go
+go mod init
+stderr 'module x'
+
+# Derive module path from location inside GOPATH.
+# 'go mod init' should succeed if modules are not explicitly disabled.
+cd $GOPATH/src/example.com/x/y
+go mod init
+stderr 'module example.com/x/y$'
+rm go.mod
+
+# go mod init rejects a zero-length go.mod file
+cp $devnull go.mod # can't use touch to create it because Windows
+! go mod init
+stderr 'go.mod already exists'
+
+# Module path from Godeps/Godeps.json overrides GOPATH.
+cd $GOPATH/src/example.com/x/y/z
+go mod init
+stderr 'unexpected.com/z'
+rm go.mod
+
+# Empty directory outside GOPATH fails.
+mkdir $WORK/empty
+cd $WORK/empty
+! go mod init
+stderr 'cannot determine module path for source directory'
+rm go.mod
+
+# Empty directory inside GOPATH/src uses location inside GOPATH.
+mkdir $GOPATH/src/empty
+cd $GOPATH/src/empty
+go mod init
+stderr 'empty'
+rm go.mod
+
+# In Plan 9, directories are automatically created in /n.
+# For example, /n/go.mod always exist, but it's a directory.
+# Test that we ignore directories when trying to find go.mod.
+cd $WORK/gomoddir
+! go list .
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+[!symlink] stop
+
+# gplink1/src/empty where gopathlink -> GOPATH
+symlink $WORK/gopathlink -> gopath
+cd $WORK/gopathlink/src/empty
+go mod init
+rm go.mod
+
+# GOPATH/src/link where link -> out of GOPATH
+symlink $GOPATH/src/link -> $WORK/empty
+cd $WORK/empty
+! go mod init
+cd $GOPATH/src/link
+go mod init
+stderr link
+rm go.mod
+
+# GOPATH/src/empty where GOPATH itself is a symlink
+env GOPATH=$WORK/gopathlink
+cd $GOPATH/src/empty
+go mod init
+rm go.mod
+cd $WORK/gopath/src/empty
+go mod init
+rm go.mod
+
+# GOPATH/src/link where GOPATH and link are both symlinks
+cd $GOPATH/src/link
+go mod init
+stderr link
+rm go.mod
+
+# Too hard: doesn't match unevaluated nor completely evaluated. (Only partially evaluated.)
+# Whether this works depends on which OS we are running on.
+# cd $WORK/gopath/src/link
+# ! go mod init
+
+-- $WORK/x/x.go --
+package x // import "x"
+
+-- $GOPATH/src/example.com/x/y/y.go --
+package y
+-- $GOPATH/src/example.com/x/y/z/z.go --
+package z
+-- $GOPATH/src/example.com/x/y/z/Godeps/Godeps.json --
+{"ImportPath": "unexpected.com/z"}
+
+-- $WORK/gomoddir/go.mod/README.txt --
+../go.mod is a directory, not a file.
+-- $WORK/gomoddir/p.go --
+package p
diff --git a/src/cmd/go/testdata/script/mod_fs_patterns.txt b/src/cmd/go/testdata/script/mod_fs_patterns.txt
new file mode 100644
index 0000000..a20fefd
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_fs_patterns.txt
@@ -0,0 +1,97 @@
+env GO111MODULE=on
+
+# File system pattern searches should skip sub-modules and vendor directories.
+cd x
+
+# all packages
+go list all
+stdout ^m$
+stdout ^m/vendor$
+! stdout vendor/
+stdout ^m/y$
+! stdout ^m/y/z
+
+# path pattern
+go list m/...
+stdout ^m$
+stdout ^m/vendor$
+! stdout vendor/
+stdout ^m/y$
+! stdout ^m/y/z
+
+# directory pattern
+go list ./...
+stdout ^m$
+stdout ^m/vendor$
+! stdout vendor/
+stdout ^m/y$
+! stdout ^m/y/z
+
+# non-existent directory should not prompt lookups
+! go build -mod=readonly example.com/nonexist
+stderr 'import lookup disabled'
+
+! go build -mod=readonly ./nonexist
+! stderr 'import lookup disabled'
+stderr '^stat '$GOPATH'[/\\]src[/\\]x[/\\]nonexist: directory not found'
+
+! go build -mod=readonly ./go.mod
+! stderr 'import lookup disabled'
+stderr 'main module \(m\) does not contain package m/go.mod'
+
+
+# File system paths and patterns should allow the '@' character.
+cd ../@at
+go list $PWD
+stdout '^at$'
+go list $PWD/...
+stdout '^at$'
+
+# The '@' character is not allowed in directory paths that are part of
+# a package path.
+cd ../badat/bad@
+! go list .
+stderr 'directory . outside available modules'
+! go list $PWD
+stderr 'directory . outside available modules'
+! go list $PWD/...
+stderr 'directory . outside available modules'
+
+-- x/go.mod --
+module m
+
+-- x/x.go --
+package x
+
+-- x/vendor/v/v.go --
+package v
+import _ "golang.org/x/crypto"
+
+-- x/vendor/v.go --
+package main
+
+-- x/y/y.go --
+package y
+
+-- x/y/z/go.mod --
+syntax error!
+
+-- x/y/z/z.go --
+package z
+
+-- x/y/z/w/w.go --
+package w
+
+-- @at/go.mod --
+module at
+
+go 1.14
+-- @at/at.go --
+package at
+
+-- badat/go.mod --
+module badat
+
+go 1.14
+-- badat/bad@/bad.go --
+package bad
diff --git a/src/cmd/go/testdata/script/mod_get_ambiguous_arg.txt b/src/cmd/go/testdata/script/mod_get_ambiguous_arg.txt
new file mode 100644
index 0000000..daed03b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_ambiguous_arg.txt
@@ -0,0 +1,107 @@
+go mod tidy
+cp go.mod go.mod.orig
+
+# If there is no sensible *package* meaning for 'm/p', it should refer
+# to *module* m/p.
+
+go get -d m/p  # @latest
+go list -m all
+stdout '^m/p v0.3.0 '
+! stdout '^m '
+
+cp go.mod.orig go.mod
+
+go get -d m/p@v0.1.0
+go list -m all
+stdout '^m/p v0.1.0 '
+! stdout '^m '
+
+# When feasible, the argument 'm/p' in 'go get m/p' refers to *package* m/p,
+# which is in module m.
+#
+# (It only refers to *module* m/p if there is no such package at the
+# requested version.)
+
+go get -d m/p@v0.2.0
+go list -m all
+stdout '^m v0.2.0 '
+stdout '^m/p v0.1.0 '  # unchanged from the previous case
+
+# Repeating the above with module m/p already in the module graph does not
+# change its meaning.
+
+go get -d m/p@v0.2.0
+go list -m all
+stdout '^m v0.2.0 '
+stdout '^m/p v0.1.0 '
+
+-- go.mod --
+module example.com
+
+go 1.16
+
+replace (
+	m v0.1.0 => ./m01
+	m v0.2.0 => ./m02
+	m v0.3.0 => ./m03
+	m/p v0.1.0 => ./mp01
+	m/p v0.2.0 => ./mp02
+	m/p v0.3.0 => ./mp03
+)
+-- m01/go.mod --
+module m
+
+go 1.16
+-- m01/README.txt --
+Module m at v0.1.0 does not yet contain package p.
+
+-- m02/go.mod --
+module m
+
+go 1.16
+
+require m/p v0.1.0
+-- m02/p/p.go --
+// Package p is present in module m, but not module m/p.
+package p
+
+-- m03/go.mod --
+module m
+
+go 1.16
+
+require m/p v0.1.0
+-- m03/README.txt --
+Module m at v0.3.0 no longer contains package p.
+
+-- mv2/go.mod --
+module m/v2
+
+go 1.16
+-- mv2/README.txt --
+This module is m/v2. It doesn't actually need to exist,
+but it explains how module m could plausibly exist
+and still contain package p at 'latest' even when module
+m/p also exists.
+
+-- mp01/go.mod --
+module m/p
+
+go 1.16
+-- mp01/README.txt --
+This module is m/p.
+Package m/p does not exist in this module.
+-- mp02/go.mod --
+module m/p
+
+go 1.16
+-- mp02/README.txt --
+This module is m/p.
+Package m/p does not exist in this module.
+-- mp03/go.mod --
+module m/p
+
+go 1.16
+-- mp03/README.txt --
+This module is m/p.
+Package m/p does not exist in this module.
diff --git a/src/cmd/go/testdata/script/mod_get_ambiguous_import.txt b/src/cmd/go/testdata/script/mod_get_ambiguous_import.txt
new file mode 100644
index 0000000..33605f5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_ambiguous_import.txt
@@ -0,0 +1,60 @@
+go list -m all
+stdout '^example.net/m v0.1.0 '
+! stdout '^example.net/m/p '
+cp go.mod go.mod.orig
+
+# Upgrading example.net/m/p without also upgrading example.net/m
+# causes the import of package example.net/m/p to be ambiguous.
+#
+# TODO(#27899): Should we automatically upgrade example.net/m to v0.2.0
+# to resolve the conflict?
+! go get -d example.net/m/p@v1.0.0
+stderr '^example.net/m/p: ambiguous import: found package example.net/m/p in multiple modules:\n\texample.net/m v0.1.0 \(.*[/\\]m1[/\\]p\)\n\texample.net/m/p v1.0.0 \(.*[/\\]p0\)\n\z'
+cmp go.mod go.mod.orig
+
+# Upgrading both modules simultaneously resolves the ambiguous upgrade.
+# Note that this command line mixes a module path (example.net/m)
+# and a package path (example.net/m/p) in the same command.
+go get -d example.net/m@v0.2.0 example.net/m/p@v1.0.0
+
+go list -m all
+stdout '^example.net/m v0.2.0 '
+stdout '^example.net/m/p v1.0.0 '
+
+-- go.mod --
+module example.net/importer
+
+go 1.16
+
+require (
+	example.net/m v0.1.0
+)
+
+replace (
+	example.net/m v0.1.0 => ./m1
+	example.net/m v0.2.0 => ./m2
+	example.net/m/p v1.0.0 => ./p0
+)
+-- importer.go --
+package importer
+import _ "example.net/m/p"
+-- m1/go.mod --
+module example.net/m
+
+go 1.16
+-- m1/p/p.go --
+package p
+-- m2/go.mod --
+module example.net/m
+
+go 1.16
+-- m2/README.txt --
+Package p has been moved to module …/m/p.
+Module …/m/p does not require any version of module …/m.
+
+-- p0/go.mod --
+module example.net/m/p
+
+go 1.16
+-- p0/p.go --
+package p
diff --git a/src/cmd/go/testdata/script/mod_get_ambiguous_pkg.txt b/src/cmd/go/testdata/script/mod_get_ambiguous_pkg.txt
new file mode 100644
index 0000000..0e7f93b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_ambiguous_pkg.txt
@@ -0,0 +1,87 @@
+# Both example.net/ambiguous v0.1.0 and example.net/ambiguous/pkg v0.1.0 exist.
+# 'go mod tidy' would arbitrarily choose the one with the longer path,
+# but 'go mod tidy' also arbitrarily chooses the latest version.
+
+cp go.mod go.mod.orig
+
+
+# From a clean slate, 'go get' currently does the same thing as 'go mod tidy':
+# it resolves the package from the module with the longest matching prefix.
+
+go get -d example.net/ambiguous/nested/pkg@v0.1.0
+go list -m all
+stdout '^example.net/ambiguous/nested v0.1.0$'
+! stdout '^example.net/ambiguous '
+
+
+# From an initial state that already depends on the shorter path,
+# the same 'go get' command should (somewhat arbitrarily) keep the
+# existing path, since it is a valid interpretation of the command.
+
+cp go.mod.orig go.mod
+go mod edit -require=example.net/ambiguous@v0.1.0
+
+go get -d example.net/ambiguous/nested/pkg@v0.1.0
+go list -m all
+stdout '^example.net/ambiguous v0.1.0$'
+! stdout '^example.net/ambiguous/nested '
+
+
+# The user should be able to make the command unambiguous by explicitly
+# upgrading the conflicting module...
+
+go get -d example.net/ambiguous@v0.2.0 example.net/ambiguous/nested/pkg@v0.1.0
+go list -m all
+stdout '^example.net/ambiguous/nested v0.1.0$'
+stdout '^example.net/ambiguous v0.2.0$'
+
+
+# ...or by explicitly NOT adding the conflicting module.
+
+cp go.mod.orig go.mod
+go mod edit -require=example.net/ambiguous@v0.1.0
+
+go get -d example.net/ambiguous/nested/pkg@v0.1.0 example.net/ambiguous/nested@none
+go list -m all
+! stdout '^example.net/ambiguous/nested '
+stdout '^example.net/ambiguous v0.1.0$'
+
+
+# The user should also be able to fix it by *downgrading* the conflicting module
+# away.
+
+cp go.mod.orig go.mod
+go mod edit -require=example.net/ambiguous@v0.1.0
+
+go get -d example.net/ambiguous@none example.net/ambiguous/nested/pkg@v0.1.0
+go list -m all
+stdout '^example.net/ambiguous/nested v0.1.0$'
+! stdout '^example.net/ambiguous '
+
+
+# In contrast, if we do the same thing tacking a wildcard pattern ('/...') on
+# the end of the package path, we get different behaviors depending on the
+# initial state, and no error. (This seems to contradict the “same meaning
+# regardless of the initial state” point above, but maybe that's ok?)
+
+cp go.mod.orig go.mod
+
+go get -d example.net/ambiguous/nested/pkg/...@v0.1.0
+go list -m all
+stdout '^example.net/ambiguous/nested v0.1.0$'
+! stdout '^example.net/ambiguous '
+
+
+cp go.mod.orig go.mod
+go mod edit -require=example.net/ambiguous@v0.1.0
+
+go get -d example.net/ambiguous/nested/pkg/...@v0.1.0
+go list -m all
+! stdout '^example.net/ambiguous/nested '
+stdout '^example.net/ambiguous v0.1.0$'
+
+
+-- go.mod --
+module test
+
+go 1.16
diff --git a/src/cmd/go/testdata/script/mod_get_changes.txt b/src/cmd/go/testdata/script/mod_get_changes.txt
new file mode 100644
index 0000000..3287b2a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_changes.txt
@@ -0,0 +1,70 @@
+# When adding a requirement, 'go get' prints a message for the requirement
+# and for changed explicit dependencies. 'go get' does not print messages
+# for changed indirect dependencies.
+go list -m all
+! stdout golang.org/x/text
+go get -d rsc.io/quote@v1.5.2
+stderr '^go get: added rsc.io/quote v1.5.2$'
+stderr '^go get: upgraded rsc.io/sampler v1.0.0 => v1.3.0$'
+! stderr '^go get.*golang.org/x/text'
+go list -m all
+stdout golang.org/x/text
+cmp go.mod go.mod.upgrade
+
+# When removing a requirement, 'go get' prints a message for the requiremnent
+# and for changed explicit dependencies. 'go get' does not print messages
+# for changed indirect dependencies.
+go get -d rsc.io/sampler@none
+stderr '^go get: downgraded rsc.io/quote v1.5.2 => v1.3.0$'
+stderr '^go get: removed rsc.io/sampler v1.3.0$'
+! stderr '^go get.*golang.org/x/text'
+cmp go.mod go.mod.downgrade
+
+# When removing or downgrading a requirement, 'go get' also prints a message
+# for explicit dependencies removed as a consequence.
+cp go.mod.usequote go.mod
+go get -d rsc.io/quote@v1.5.1
+stderr '^go get: downgraded rsc.io/quote v1.5.2 => v1.5.1$'
+stderr '^go get: removed usequote v0.0.0$'
+
+-- go.mod --
+module m
+
+go 1.16
+
+require rsc.io/sampler v1.0.0
+-- go.sum --
+rsc.io/sampler v1.0.0 h1:SRJnjyQ07sAtq6G4RcfJEmz8JxqLyj3PoGXG2VhbDWo=
+rsc.io/sampler v1.0.0/go.mod h1:cqxpM3ZVz9VtirqxZPmrWzkQ+UkiNiGtkrN+B+i8kx8=
+-- go.mod.upgrade --
+module m
+
+go 1.16
+
+require (
+	rsc.io/quote v1.5.2 // indirect
+	rsc.io/sampler v1.3.0
+)
+-- go.mod.downgrade --
+module m
+
+go 1.16
+
+require (
+	golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c // indirect
+	rsc.io/quote v1.3.0 // indirect
+)
+-- go.mod.usequote --
+module m
+
+go 1.16
+
+require usequote v0.0.0
+
+replace usequote => ./usequote
+-- usequote/go.mod --
+module usequote
+
+go 1.16
+
+require rsc.io/quote v1.5.2
diff --git a/src/cmd/go/testdata/script/mod_get_cmd.txt b/src/cmd/go/testdata/script/mod_get_cmd.txt
new file mode 100644
index 0000000..d31cee1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_cmd.txt
@@ -0,0 +1,20 @@
+env GO111MODULE=on
+[short] skip
+
+# Test that when 'go get' is run from $GOBIN, it does not delete binaries
+# after it installs them. Verifies golang.org/issue/32766.
+
+go get example.com/tools/cmd/hello
+
+# 'go get' should not delete the command when run from $GOPATH/bin
+cd $GOPATH/bin
+exists hello$GOEXE
+go get example.com/tools/cmd/hello
+exists hello$GOEXE
+
+# 'go get' should not delete the command when run from a different $GOBIN
+mkdir $WORK/bin
+cd $WORK/bin
+env GOBIN=$WORK/bin
+go get example.com/tools/cmd/hello
+exists hello$GOEXE
diff --git a/src/cmd/go/testdata/script/mod_get_commit.txt b/src/cmd/go/testdata/script/mod_get_commit.txt
new file mode 100644
index 0000000..4649491
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_commit.txt
@@ -0,0 +1,51 @@
+env GO111MODULE=on
+[short] skip
+
+# @commit should resolve
+
+# golang.org/x/text/language@commit should resolve.
+# Because of -d, the compiler should not run.
+go get -d -x golang.org/x/text/language@14c0d48
+! stderr 'compile|cp|gccgo .*language\.a$'
+
+# go get should skip build with no Go files in root
+go get -d golang.org/x/text@14c0d48
+
+# dropping -d, we should see a build.
+[short] skip
+
+env GOCACHE=$WORK/gocache  # Looking for compile commands, so need a clean cache.
+
+go get -x golang.org/x/text/language@14c0d48
+stderr 'compile|cp|gccgo .*language\.a$'
+
+# BUG: after the build, the package should not be stale, as 'go install' would
+# not do anything further.
+go list -f '{{.Stale}}' golang.org/x/text/language
+stdout ^true
+
+# install after get should not run the compiler again.
+go install -x golang.org/x/text/language
+! stderr 'compile|cp|gccgo .*language\.a$'
+
+# even with -d, we should see an error for unknown packages.
+! go get -d -x golang.org/x/text/foo@14c0d48
+
+# get pseudo-version should record that version
+go get -d rsc.io/quote@v0.0.0-20180214005840-23179ee8a569
+grep 'rsc.io/quote v0.0.0-20180214005840-23179ee8a569' go.mod
+
+# but as commit should record as v1.5.1
+go get -d rsc.io/quote@23179ee8
+grep 'rsc.io/quote v1.5.1' go.mod
+
+# go mod edit -require does not interpret commits
+go mod edit -require rsc.io/quote@23179ee
+grep 'rsc.io/quote 23179ee' go.mod
+
+# but other commands fix them
+go mod graph
+grep 'rsc.io/quote v1.5.1' go.mod
+
+-- go.mod --
+module x
diff --git a/src/cmd/go/testdata/script/mod_get_direct.txt b/src/cmd/go/testdata/script/mod_get_direct.txt
new file mode 100644
index 0000000..42ccbcd
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_direct.txt
@@ -0,0 +1,20 @@
+# Regression test for golang.org/issue/34092: with an empty module cache,
+# 'GOPROXY=direct go get golang.org/x/tools/gopls@master' did not correctly
+# resolve the pseudo-version for its dependency on golang.org/x/tools.
+
+[short] skip
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+go list -m cloud.google.com/go@master
+! stdout 'v0.0.0-'
+
+-- go.mod --
+module example.com
+
+go 1.14
+-- go.sum --
diff --git a/src/cmd/go/testdata/script/mod_get_downgrade.txt b/src/cmd/go/testdata/script/mod_get_downgrade.txt
new file mode 100644
index 0000000..a954c10
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_downgrade.txt
@@ -0,0 +1,56 @@
+env GO111MODULE=on
+[short] skip
+
+# downgrade sampler should downgrade quote
+cp go.mod.orig go.mod
+go get -d rsc.io/sampler@v1.0.0
+go list -m all
+stdout 'rsc.io/quote v1.4.0'
+stdout 'rsc.io/sampler v1.0.0'
+
+# downgrade sampler away should downgrade quote further
+go get -d rsc.io/sampler@none
+go list -m all
+stdout 'rsc.io/quote v1.3.0'
+
+# downgrade should report inconsistencies and not change go.mod
+go get -d rsc.io/quote@v1.5.1
+go list -m all
+stdout 'rsc.io/quote v1.5.1'
+stdout 'rsc.io/sampler v1.3.0'
+
+! go get -d rsc.io/sampler@v1.0.0 rsc.io/quote@v1.5.2 golang.org/x/text@none
+stderr '^go get: rsc.io/quote@v1.5.2 requires rsc.io/sampler@v1.3.0, not rsc.io/sampler@v1.0.0$'
+stderr '^go get: rsc.io/quote@v1.5.2 requires golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c, not golang.org/x/text@none$'
+
+go list -m all
+stdout 'rsc.io/quote v1.5.1'
+stdout 'rsc.io/sampler v1.3.0'
+
+# go get -u args should limit upgrades
+cp go.mod.empty go.mod
+go get -d -u rsc.io/quote@v1.4.0 rsc.io/sampler@v1.0.0
+go list -m all
+stdout 'rsc.io/quote v1.4.0'
+stdout 'rsc.io/sampler v1.0.0'
+! stdout golang.org/x/text
+
+# downgrading away quote should also downgrade away latemigrate/v2,
+# since there are no older versions. v2.0.0 is incompatible.
+cp go.mod.orig go.mod
+go list -m -versions example.com/latemigrate/v2
+stdout v2.0.0 # proxy may serve incompatible versions
+go get -d rsc.io/quote@none
+go list -m all
+! stdout 'example.com/latemigrate/v2'
+
+-- go.mod.orig --
+module x
+require (
+	rsc.io/quote v1.5.1
+	example.com/latemigrate/v2 v2.0.1
+)
+-- go.mod.empty --
+module x
+-- x.go --
+package x
diff --git a/src/cmd/go/testdata/script/mod_get_downgrade_missing.txt b/src/cmd/go/testdata/script/mod_get_downgrade_missing.txt
new file mode 100644
index 0000000..5b768fa
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_downgrade_missing.txt
@@ -0,0 +1,43 @@
+cp go.mod go.mod.orig
+
+# getting a specific version of a module along with a pattern
+# not yet present in that module should report the version mismatch
+# rather than a "matched no packages" warning.
+
+! go get -d example.net/pkgadded@v1.1.0 example.net/pkgadded/subpkg/...
+stderr '^go get: example.net/pkgadded@v1.1.0 conflicts with example.net/pkgadded/subpkg/...@upgrade \(v1.2.0\)$'
+! stderr 'matched no packages'
+cmp go.mod.orig go.mod
+
+
+# A wildcard pattern should match the pattern with that path.
+
+go get -d example.net/pkgadded/...@v1.0.0
+go list -m all
+stdout '^example.net/pkgadded v1.0.0'
+cp go.mod.orig go.mod
+
+
+# If we need to resolve a transitive dependency of a package,
+# and another argument constrains away the version that provides that
+# package, then 'go get' should fail with a useful error message.
+
+! go get -d example.net/pkgadded@v1.0.0 .
+stderr '^example.com/m imports\n\texample.net/pkgadded/subpkg: cannot find module providing package example.net/pkgadded/subpkg$'
+! stderr 'example.net/pkgadded v1\.2\.0'
+cmp go.mod.orig go.mod
+
+go get -d example.net/pkgadded@v1.0.0
+! go list -deps -mod=readonly .
+stderr '^m.go:3:8: cannot find module providing package example\.net/pkgadded/subpkg: '
+
+-- go.mod --
+module example.com/m
+
+go 1.16
+
+require example.net/pkgadded v1.2.0
+-- m.go --
+package m
+
+import _ "example.net/pkgadded/subpkg"
diff --git a/src/cmd/go/testdata/script/mod_get_errors.txt b/src/cmd/go/testdata/script/mod_get_errors.txt
new file mode 100644
index 0000000..5c37058
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_errors.txt
@@ -0,0 +1,69 @@
+cp go.mod go.mod.orig
+
+
+# Both 'go get' and 'go get -d' should fail, without updating go.mod,
+# if the transitive dependencies of the requested package (by default,
+# the package in the current directory) cannot be resolved.
+
+! go get
+stderr '^example.com/m imports\n\texample.com/badimport imports\n\texample.net/oops: cannot find module providing package example.net/oops$'
+cmp go.mod.orig go.mod
+
+! go get -d
+stderr '^example.com/m imports\n\texample.com/badimport imports\n\texample.net/oops: cannot find module providing package example.net/oops$'
+cmp go.mod.orig go.mod
+
+cd importsyntax
+
+
+# If 'go get' fails due to a compile error (such as a syntax error),
+# it should not update the go.mod file.
+
+! go get
+stderr '^..[/\\]badimport[/\\]syntaxerror[/\\]syntaxerror.go:1:1: expected ''package'', found pack$'  # TODO: An import stack would be nice.
+cmp ../go.mod.orig ../go.mod
+
+
+# A syntax error in a dependency prevents the compiler from needing that
+# dependency's imports, so 'go get -d' should not report an error when those
+# imports cannot be resolved: it has all of the dependencies that the compiler
+# needs, and the user did not request to run the compiler.
+
+go get -d
+cmp ../go.mod.syntax-d ../go.mod
+
+
+-- go.mod --
+module example.com/m
+
+go 1.16
+
+replace example.com/badimport v0.1.0 => ./badimport
+-- go.mod.syntax-d --
+module example.com/m
+
+go 1.16
+
+replace example.com/badimport v0.1.0 => ./badimport
+
+require example.com/badimport v0.1.0
+-- m.go --
+package m
+
+import _ "example.com/badimport"
+-- importsyntax/importsyntax.go --
+package importsyntax
+
+import _ "example.com/badimport/syntaxerror"
+-- badimport/go.mod --
+module example.com/badimport
+
+go 1.16
+-- badimport/badimport.go --
+package badimport
+
+import "example.net/oops"
+-- badimport/syntaxerror/syntaxerror.go --
+pack-age syntaxerror // sic
+
+import "example.net/oops"
diff --git a/src/cmd/go/testdata/script/mod_get_extra.txt b/src/cmd/go/testdata/script/mod_get_extra.txt
new file mode 100644
index 0000000..7efa24e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_extra.txt
@@ -0,0 +1,69 @@
+cp go.mod go.mod.orig
+
+# The -u flag should not (even temporarily) upgrade modules whose versions are
+# determined by explicit queries to any version other than the explicit one.
+# Otherwise, 'go get -u' could introduce spurious dependencies.
+
+go get -d -u example.net/a@v0.1.0 example.net/b@v0.1.0
+go list -m all
+stdout '^example.net/a v0.1.0 '
+stdout '^example.net/b v0.1.0 '
+! stdout '^example.net/c '
+
+
+# TODO(bcmills): This property does not yet hold for modules added for
+# missing packages when the newly-added module matches a wildcard.
+
+cp go.mod.orig go.mod
+
+go get -d -u example.net/a@v0.1.0 example.net/b/...@v0.1.0
+go list -m all
+stdout '^example.net/a v0.1.0 '
+stdout '^example.net/b v0.1.0 '
+stdout '^example.net/c '  # BUG, but a minor and rare one
+
+
+-- go.mod --
+module example
+
+go 1.15
+
+replace (
+	example.net/a v0.1.0 => ./a1
+	example.net/b v0.1.0 => ./b1
+	example.net/b v0.2.0 => ./b2
+	example.net/c v0.1.0 => ./c1
+	example.net/c v0.2.0 => ./c1
+)
+
+-- a1/go.mod --
+module example.net/a
+
+go 1.15
+
+// example.net/a needs a dependency on example.net/b, but lacks a requirement
+// on it (perhaps due to a missed file in a VCS commit).
+-- a1/a.go --
+package a
+import _ "example.net/b"
+
+-- b1/go.mod --
+module example.net/b
+
+go 1.15
+-- b1/b.go --
+package b
+
+-- b2/go.mod --
+module example.net/b
+
+go 1.15
+
+require example.net/c v0.1.0
+-- b2/b.go --
+package b
+
+-- c1/go.mod --
+module example.net/c
+
+go 1.15
diff --git a/src/cmd/go/testdata/script/mod_get_fallback.txt b/src/cmd/go/testdata/script/mod_get_fallback.txt
new file mode 100644
index 0000000..9733fa3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_fallback.txt
@@ -0,0 +1,10 @@
+env GO111MODULE=on
+
+[!net] skip
+
+env GOPROXY=https://proxy.golang.org,direct
+env GOSUMDB=off
+
+go get -x -v -d golang.org/x/tools/cmd/goimports
+stderr '# get https://proxy.golang.org/golang.org/x/tools/@v/list'
+! stderr '# get https://golang.org'
diff --git a/src/cmd/go/testdata/script/mod_get_fossil.txt b/src/cmd/go/testdata/script/mod_get_fossil.txt
new file mode 100644
index 0000000..baad544
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_fossil.txt
@@ -0,0 +1,29 @@
+[!net] skip
+[!exec:fossil] skip
+
+# Regression test for 'go get' to ensure repositories
+# provided by fossil v2.12 and up are able to be fetched
+# and parsed correctly.
+# Verifies golang.org/issue/42323.
+
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# 'go get' for the fossil repo will fail if fossil
+# is unable to determine your fossil user. Easiest
+# way to set it for use by 'go get' is specifying
+# a any non-empty $USER; the value doesn't otherwise matter.
+env USER=fossiluser
+env FOSSIL_HOME=$WORK/home
+
+# Attempting to get the latest version of a fossil repo.
+go get vcs-test.golang.org/fossil/hello.fossil
+! stderr 'unexpected response from fossil info'
+grep 'vcs-test.golang.org/fossil/hello.fossil' go.mod
+exists $GOPATH/bin/hello.fossil$GOEXE
+
+-- go.mod --
+module x
+-- $WORK/home/.fossil --
diff --git a/src/cmd/go/testdata/script/mod_get_go_file.txt b/src/cmd/go/testdata/script/mod_get_go_file.txt
new file mode 100644
index 0000000..0c7b5dc
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_go_file.txt
@@ -0,0 +1,68 @@
+# Tests Issue #38478
+# Tests that go get in GOMOD mode returns a specific error if the argument
+# ends with '.go', has no version, and either has no slash or refers to an
+# existing file.
+
+env GO111MODULE=on
+
+# argument doesn't have .go suffix and has no version
+! go get test
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix and has version
+! go get test.go@v1.0.0
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, is a file and exists
+! go get test.go
+stderr 'go get test.go: arguments must be package or module paths'
+
+# argument has .go suffix, doesn't exist and has no slashes
+! go get test_missing.go
+stderr 'arguments must be package or module paths'
+
+# argument has .go suffix, is a file and exists in sub-directory
+! go get test/test.go
+stderr 'go get: test/test.go exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, doesn't exist and has slashes
+! go get test/test_missing.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+
+# argument has .go suffix, is a symlink and exists
+[symlink] symlink test_sym.go -> test.go
+[symlink] ! go get test_sym.go
+[symlink] stderr 'go get test_sym.go: arguments must be package or module paths'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a symlink and exists in sub-directory
+[symlink] symlink test/test_sym.go -> test.go
+[symlink] ! go get test/test_sym.go
+[symlink] stderr 'go get: test/test_sym.go exists as a file, but ''go get'' requires package arguments'
+[symlink] rm test_sym.go
+
+# argument has .go suffix, is a directory and exists
+mkdir test_dir.go
+! go get test_dir.go
+stderr 'go get test_dir.go: arguments must be package or module paths'
+rm test_dir.go
+
+# argument has .go suffix, is a directory and exists in sub-directory
+mkdir test/test_dir.go
+! go get test/test_dir.go
+! stderr 'arguments must be package or module paths'
+! stderr 'exists as a file, but ''go get'' requires package arguments'
+rm test/test_dir.go
+
+
+-- test.go --
+package main
+func main() {println("test")}
+
+
+-- test/test.go --
+package main
+func main() {println("test")}
diff --git a/src/cmd/go/testdata/script/mod_get_hash.txt b/src/cmd/go/testdata/script/mod_get_hash.txt
new file mode 100644
index 0000000..3bb3ee7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_hash.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+[!net] skip
+[!exec:git] skip
+
+# fetch commit hash reachable from refs/heads/* and refs/tags/* is OK
+go list -m golang.org/x/time@8be79e1e0910c292df4e79c241bb7e8f7e725959 # on master branch
+
+# fetch other commit hash, even with a non-standard ref, is not OK
+! go list -m golang.org/x/time@334d83c35137ac2b376c1dc3e4c7733791855a3a # refs/changes/24/41624/3
+stderr 'unknown revision'
+! go list -m golang.org/x/time@v0.0.0-20170424233410-334d83c35137
+stderr 'unknown revision'
+! go list -m golang.org/x/time@334d83c35137
+stderr 'unknown revision'
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_get_incompatible.txt b/src/cmd/go/testdata/script/mod_get_incompatible.txt
new file mode 100644
index 0000000..8000ee6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_incompatible.txt
@@ -0,0 +1,26 @@
+env GO111MODULE=on
+
+go get -d x
+go list -m all
+stdout 'rsc.io/breaker v2.0.0\+incompatible'
+
+cp go.mod2 go.mod
+go get -d rsc.io/breaker@7307b30
+go list -m all
+stdout 'rsc.io/breaker v2.0.0\+incompatible'
+
+go get -d rsc.io/breaker@v2.0.0
+go list -m all
+stdout 'rsc.io/breaker v2.0.0\+incompatible'
+
+-- go.mod --
+module x
+
+-- go.mod2 --
+module x
+require rsc.io/breaker v1.0.0
+
+-- x.go --
+package x
+import "rsc.io/breaker"
+var _ = breaker.XX
diff --git a/src/cmd/go/testdata/script/mod_get_indirect.txt b/src/cmd/go/testdata/script/mod_get_indirect.txt
new file mode 100644
index 0000000..e1cc1ab
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_indirect.txt
@@ -0,0 +1,59 @@
+env GO111MODULE=on
+[short] skip
+
+# get -u should not upgrade anything, since the package
+# in the current directory doesn't import anything.
+go get -u
+go list -m all
+stdout 'quote v1.5.1$'
+grep 'rsc.io/quote v1.5.1$' go.mod
+
+# get -u should find quote v1.5.2 once there is a use.
+cp $WORK/tmp/usequote.go x.go
+go get -u
+go list -m all
+stdout 'quote v1.5.2$'
+grep 'rsc.io/quote v1.5.2$' go.mod
+
+# it should also update x/text later than requested by v1.5.2
+go list -m -f '{{.Path}} {{.Version}}{{if .Indirect}} // indirect{{end}}' all
+stdout '^golang.org/x/text [v0-9a-f\.-]+ // indirect'
+grep 'golang.org/x/text [v0-9a-f\.-]+ // indirect' go.mod
+
+# importing an empty module root as a package does not remove indirect tag.
+cp $WORK/tmp/usetext.go x.go
+go list -e
+grep 'golang.org/x/text v0.3.0 // indirect$' go.mod
+
+# indirect tag should be removed upon seeing direct import.
+cp $WORK/tmp/uselang.go x.go
+go get -d
+grep 'rsc.io/quote v1.5.2$' go.mod
+grep 'golang.org/x/text [v0-9a-f\.-]+$' go.mod
+
+# indirect tag should be added by go mod tidy
+cp $WORK/tmp/usequote.go x.go
+go mod tidy
+grep 'rsc.io/quote v1.5.2$' go.mod
+grep 'golang.org/x/text [v0-9a-f\.-]+ // indirect' go.mod
+
+# requirement should be dropped entirely if not needed
+cp $WORK/tmp/uselang.go x.go
+go mod tidy
+! grep rsc.io/quote go.mod
+grep 'golang.org/x/text [v0-9a-f\.-]+$' go.mod
+
+-- go.mod --
+module x
+require rsc.io/quote v1.5.1
+-- x.go --
+package x
+-- $WORK/tmp/usetext.go --
+package x
+import _ "golang.org/x/text"
+-- $WORK/tmp/uselang.go --
+package x
+import _ "golang.org/x/text/language"
+-- $WORK/tmp/usequote.go --
+package x
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_insecure_redirect.txt b/src/cmd/go/testdata/script/mod_get_insecure_redirect.txt
new file mode 100644
index 0000000..3755f17
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_insecure_redirect.txt
@@ -0,0 +1,34 @@
+# golang.org/issue/29591: 'go get' was following plain-HTTP redirects even without -insecure.
+
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+! go get -d vcs-test.golang.org/insecure/go/insecure
+stderr 'redirected .* to insecure URL'
+
+go get -d -insecure vcs-test.golang.org/insecure/go/insecure
+
+# insecure host
+env GOINSECURE=vcs-test.golang.org
+go clean -modcache
+go get -d vcs-test.golang.org/insecure/go/insecure
+
+# insecure glob host
+env GOINSECURE=*.golang.org
+go clean -modcache
+go get -d vcs-test.golang.org/insecure/go/insecure
+
+# insecure multiple host
+env GOINSECURE=somewhere-else.com,*.golang.org
+go clean -modcache
+go get -d vcs-test.golang.org/insecure/go/insecure
+
+# different insecure host does not fetch
+env GOINSECURE=somewhere-else.com
+go clean -modcache
+! go get -d vcs-test.golang.org/insecure/go/insecure
+stderr 'redirected .* to insecure URL'
diff --git a/src/cmd/go/testdata/script/mod_get_issue37438.txt b/src/cmd/go/testdata/script/mod_get_issue37438.txt
new file mode 100644
index 0000000..38b2031
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_issue37438.txt
@@ -0,0 +1,37 @@
+# Regression test for https://golang.org/issue/37438.
+#
+# If a path exists at the requested version, but does not exist at the
+# version of the module that is already required and does not exist at
+# the version that would be selected by 'go mod tidy', then
+# 'go get foo@requested' should resolve the requested version,
+# not error out on the (unrelated) latest one.
+
+go get -d example.net/a/p@v0.2.0
+
+-- go.mod --
+module example
+
+go 1.15
+
+require example.net/a v0.1.0
+
+replace (
+	example.net/a v0.1.0 => ./a1
+	example.net/a v0.2.0 => ./a2
+	example.net/a v0.3.0 => ./a1
+)
+
+-- a1/go.mod --
+module example.net/a
+
+go 1.15
+-- a1/README --
+package example.net/a/p does not exist at this version.
+
+-- a2/go.mod --
+module example.net/a
+
+go 1.15
+-- a2/p/p.go --
+// Package p exists only at v0.2.0.
+package p
diff --git a/src/cmd/go/testdata/script/mod_get_latest_pseudo.txt b/src/cmd/go/testdata/script/mod_get_latest_pseudo.txt
new file mode 100644
index 0000000..241a0c2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_latest_pseudo.txt
@@ -0,0 +1,10 @@
+# Check that we can build a module with no tagged versions by querying
+# "@latest" through a proxy.
+# Verifies golang.org/issue/32636
+
+env GO111MODULE=on
+
+go mod init m
+go get -d example.com/notags
+go list -m all
+stdout '^example.com/notags v0.0.0-20190507143103-cc8cbe209b64$'
diff --git a/src/cmd/go/testdata/script/mod_get_local.txt b/src/cmd/go/testdata/script/mod_get_local.txt
new file mode 100644
index 0000000..eb09da5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_local.txt
@@ -0,0 +1,62 @@
+# Test 'go get' with a local module with a name that is not valid for network lookup.
+[short] skip
+
+env GO111MODULE=on
+go mod edit -fmt
+cp go.mod go.mod.orig
+
+# 'go get -u' within the main module should work, even if it has a local-only name.
+cp go.mod.orig go.mod
+go get -d -u ./...
+grep 'rsc.io/quote.*v1.5.2' go.mod
+grep 'golang.org/x/text.*v0.3.0' go.mod
+cp go.mod go.mod.implicitmod
+
+# 'go get -u local/...' should be equivalent to 'go get -u ./...'
+# (assuming no nested modules)
+cp go.mod.orig go.mod
+go get -d -u local/...
+cmp go.mod go.mod.implicitmod
+
+# For the main module, @patch should be a no-op.
+cp go.mod.orig go.mod
+go get -d -u local/...@patch
+cmp go.mod go.mod.implicitmod
+
+# 'go get -u -d' in the empty root of the main module should fail.
+# 'go get -u -d .' should also fail.
+cp go.mod.orig go.mod
+! go get -u -d
+! go get -u -d .
+
+# 'go get -u -d .' within a package in the main module updates the dependencies
+# of that package.
+cp go.mod.orig go.mod
+cd uselang
+go get -u -d .
+cd ..
+grep 'rsc.io/quote.*v1.3.0' go.mod
+grep 'golang.org/x/text.*v0.3.0' go.mod
+cp go.mod go.mod.dotpkg
+
+# 'go get -u -d' with an explicit package in the main module updates the
+# dependencies of that package.
+cp go.mod.orig go.mod
+go get -u -d local/uselang
+cmp go.mod go.mod.dotpkg
+
+-- go.mod --
+module local
+
+require (
+	golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c
+	rsc.io/quote v1.3.0
+)
+
+-- uselang/uselang.go --
+package uselang
+import _ "golang.org/x/text/language"
+
+-- usequote/usequote.go --
+package usequote
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_main.txt b/src/cmd/go/testdata/script/mod_get_main.txt
new file mode 100644
index 0000000..50b2fee
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_main.txt
@@ -0,0 +1,51 @@
+env GO111MODULE=on
+cp go.mod.orig go.mod
+
+# relative and absolute paths must be within the main module.
+! go get -d ..
+stderr '^go get: \.\. \('$WORK'[/\\]gopath\) is not within module rooted at '$WORK'[/\\]gopath[/\\]src$'
+! go get -d $WORK
+stderr '^go get: '$WORK' is not within module rooted at '$WORK'[/\\]gopath[/\\]src$'
+! go get -d ../...
+stderr '^go get: \.\./\.\.\. \('$WORK'[/\\]gopath([/\\]...)?\) is not within module rooted at '$WORK'[/\\]gopath[/\\]src$'
+! go get -d $WORK/...
+stderr '^go get: '$WORK'[/\\]\.\.\. is not within module rooted at '$WORK'[/\\]gopath[/\\]src$'
+
+# @patch and @latest within the main module refer to the current version.
+# The main module won't be upgraded, but missing dependencies will be added.
+go get -d rsc.io/x
+grep 'rsc.io/quote v1.5.2' go.mod
+go get -d rsc.io/x@upgrade
+grep 'rsc.io/quote v1.5.2' go.mod
+cp go.mod.orig go.mod
+go get -d rsc.io/x@patch
+grep 'rsc.io/quote v1.5.2' go.mod
+cp go.mod.orig go.mod
+
+
+# Upgrading a package pattern not contained in the main module should not
+# attempt to upgrade the main module.
+go get -d rsc.io/quote/...@v1.5.1
+grep 'rsc.io/quote v1.5.1' go.mod
+
+
+# The main module cannot be updated to a specific version.
+! go get -d rsc.io@v0.1.0
+stderr '^go get: can''t request version "v0.1.0" of the main module \(rsc.io\)$'
+
+# A package in the main module can't be upgraded either.
+! go get -d rsc.io/x@v0.1.0
+stderr '^go get: package rsc.io/x is in the main module, so can''t request version v0.1.0$'
+
+# Nor can a pattern matching packages in the main module.
+! go get -d rsc.io/x/...@latest
+stderr '^go get: pattern rsc.io/x/... matches package rsc.io/x in the main module, so can''t request version latest$'
+
+-- go.mod.orig --
+module rsc.io
+
+go 1.13
+-- x/x.go --
+package x
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_major.txt b/src/cmd/go/testdata/script/mod_get_major.txt
new file mode 100644
index 0000000..367ede9
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_major.txt
@@ -0,0 +1,23 @@
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# golang.org/issue/34383: if a module path ends in a major-version suffix,
+# ensure that 'direct' mode can resolve the package to a module.
+
+go get -d vcs-test.golang.org/git/v3pkg.git/v3@v3.0.0
+
+go list -m vcs-test.golang.org/git/v3pkg.git/v3
+stdout '^vcs-test.golang.org/git/v3pkg.git/v3 v3.0.0$'
+
+go get -d vcs-test.golang.org/git/empty-v2-without-v1.git/v2@v2.0.0
+
+go list -m vcs-test.golang.org/git/empty-v2-without-v1.git/v2
+stdout '^vcs-test.golang.org/git/empty-v2-without-v1.git/v2 v2.0.0$'
+
+-- go.mod --
+module example.com
+go 1.13
diff --git a/src/cmd/go/testdata/script/mod_get_missing_ziphash.txt b/src/cmd/go/testdata/script/mod_get_missing_ziphash.txt
new file mode 100644
index 0000000..8f6793e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_missing_ziphash.txt
@@ -0,0 +1,55 @@
+# Test that if the module cache contains an extracted source directory but not
+# a ziphash, 'go build' complains about a missing sum, and 'go get' adds
+# the sum. Verifies #44749.
+
+# With a tidy go.sum, go build succeeds. This also populates the module cache.
+cp go.sum.tidy go.sum
+go build -n use
+env GOPROXY=off
+env GOSUMDB=off
+
+# Control case: if we delete the hash for rsc.io/quote v1.5.2,
+# 'go build' reports an error. 'go get' adds the sum.
+cp go.sum.bug go.sum
+! go build -n use
+stderr '^use.go:3:8: missing go.sum entry for module providing package rsc.io/quote \(imported by use\); to add:\n\tgo get use$'
+go get -d use
+cmp go.sum go.sum.tidy
+go build -n use
+
+# If we delete the hash *and* the ziphash file, we should see the same behavior.
+cp go.sum.bug go.sum
+rm $WORK/gopath/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.ziphash
+! go build -n use
+stderr '^use.go:3:8: missing go.sum entry for module providing package rsc.io/quote \(imported by use\); to add:\n\tgo get use$'
+go get -d use
+cmp go.sum go.sum.tidy
+go build -n use
+
+-- go.mod --
+module use
+
+go 1.17
+
+require rsc.io/quote v1.5.2
+-- go.sum.tidy --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2 h1:3fEykkD9k7lYzXqCYrwGAf7iNhbk4yCjHmKBN9td4L0=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+rsc.io/testonly v1.0.0 h1:K/VWHdO+Jv7woUXG0GzVNx1czBXUt3Ib1deaMn+xk64=
+rsc.io/testonly v1.0.0/go.mod h1:OqmGbIFOcF+XrFReLOGZ6BhMM7uMBiQwZsyNmh74SzY=
+-- go.sum.bug --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+rsc.io/testonly v1.0.0 h1:K/VWHdO+Jv7woUXG0GzVNx1czBXUt3Ib1deaMn+xk64=
+rsc.io/testonly v1.0.0/go.mod h1:OqmGbIFOcF+XrFReLOGZ6BhMM7uMBiQwZsyNmh74SzY=
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_moved.txt b/src/cmd/go/testdata/script/mod_get_moved.txt
new file mode 100644
index 0000000..8430a73
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_moved.txt
@@ -0,0 +1,40 @@
+env GO111MODULE=on
+[short] skip
+
+# A 'go get' that worked at a previous version should continue to work at that version,
+# even if the package was subsequently moved into a submodule.
+go mod init example.com/foo
+go get -d example.com/split/subpkg@v1.0.0
+go list -m all
+stdout 'example.com/split v1.0.0'
+
+# A 'go get' that simultaneously upgrades away conflicting package defitions is not ambiguous.
+go get -d example.com/split/subpkg@v1.1.0
+
+# A 'go get' without an upgrade should find the package.
+rm go.mod
+go mod init example.com/foo
+go get -d example.com/split/subpkg
+go list -m all
+stdout 'example.com/split/subpkg v1.1.0'
+
+
+# A 'go get' that worked at a previous version should continue to work at that version,
+# even if the package was subsequently moved into a parent module.
+rm go.mod
+go mod init example.com/foo
+go get -d example.com/join/subpkg@v1.0.0
+go list -m all
+stdout 'example.com/join/subpkg v1.0.0'
+
+# A 'go get' that simultaneously upgrades away conflicting package definitions is not ambiguous.
+# (A wildcard pattern applies to both packages and modules,
+# because we define wildcard matching to apply after version resolution.)
+go get -d example.com/join/subpkg/...@v1.1.0
+
+# A 'go get' without an upgrade should find the package.
+rm go.mod
+go mod init example.com/foo
+go get -d example.com/join/subpkg@v1.1.0
+go list -m all
+stdout 'example.com/join v1.1.0'
diff --git a/src/cmd/go/testdata/script/mod_get_newcycle.txt b/src/cmd/go/testdata/script/mod_get_newcycle.txt
new file mode 100644
index 0000000..f71620c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_newcycle.txt
@@ -0,0 +1,14 @@
+env GO111MODULE=on
+
+# Download modules to avoid stderr chatter
+go mod download example.com@v1.0.0
+go mod download example.com/newcycle/a@v1.0.0
+go mod download example.com/newcycle/a@v1.0.1
+go mod download example.com/newcycle/b@v1.0.0
+
+go mod init m
+! go get example.com/newcycle/a@v1.0.0
+cmp stderr stderr-expected
+
+-- stderr-expected --
+go get: example.com/newcycle/a@v1.0.0 requires example.com/newcycle/a@v1.0.1, not example.com/newcycle/a@v1.0.0
diff --git a/src/cmd/go/testdata/script/mod_get_none.txt b/src/cmd/go/testdata/script/mod_get_none.txt
new file mode 100644
index 0000000..b358f05
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_none.txt
@@ -0,0 +1,12 @@
+env GO111MODULE=on
+
+go mod init example.com/foo
+
+# 'go get bar@none' should be a no-op if module bar is not active.
+go get -d example.com/bar@none
+go list -m all
+! stdout example.com/bar
+
+go get -d example.com/bar@none
+go list -m all
+! stdout example.com/bar
diff --git a/src/cmd/go/testdata/script/mod_get_nopkgs.txt b/src/cmd/go/testdata/script/mod_get_nopkgs.txt
new file mode 100644
index 0000000..078e71a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_nopkgs.txt
@@ -0,0 +1,40 @@
+cd subdir
+
+# 'go get' on empty patterns that are necessarily local to the module
+# should warn that the patterns are empty, exactly once.
+
+go get ./...
+stderr -count=1 'matched no packages'
+
+go get -d ./...
+stderr -count=1 'matched no packages'
+
+# 'go get' on patterns that could conceivably match nested modules
+# should report a module resolution error.
+
+go get -d example.net/emptysubdir/... # control case
+
+! go get -d example.net/emptysubdir/subdir/...
+! stderr 'matched no packages'
+stderr '^go get example\.net/emptysubdir/subdir/\.\.\.: module example\.net/emptysubdir/subdir: reading http://.*: 404 Not Found\n\tserver response: 404 page not found\n\z'
+
+# It doesn't make sense to 'go get' a path in the standard library,
+# since the standard library necessarily can't have unresolved imports.
+#
+# TODO(#30241): Maybe that won't always be the case?
+#
+# For that case, we emit a "malformed module path" error message,
+# which isn't ideal either.
+
+! go get -d builtin/...  # in GOROOT/src, but contains no packages
+stderr '^go get builtin/...: malformed module path "builtin": missing dot in first path element$'
+
+-- go.mod --
+module example.net/emptysubdir
+
+go 1.16
+-- emptysubdir.go --
+// Package emptysubdir has a subdirectory containing no packages.
+package emptysubdir
+-- subdir/README.txt --
+This module intentionally does not contain any p
diff --git a/src/cmd/go/testdata/script/mod_get_patch.txt b/src/cmd/go/testdata/script/mod_get_patch.txt
new file mode 100644
index 0000000..053ef62
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_patch.txt
@@ -0,0 +1,130 @@
+# This test examines the behavior of 'go get …@patch'
+# See also mod_upgrade_patch.txt (focused on "-u=patch" specifically)
+# and mod_get_patchmod.txt (focused on module/package ambiguities).
+
+cp go.mod go.mod.orig
+
+# example.net/b@patch refers to the patch for the version of b that was selected
+# at the start of 'go get', not the version after applying other changes.
+
+! go get -d example.net/a@v0.2.0 example.net/b@patch
+stderr '^go get: example.net/a@v0.2.0 requires example.net/b@v0.2.0, not example.net/b@patch \(v0.1.1\)$'
+cmp go.mod go.mod.orig
+
+
+# -u=patch changes the default version for other arguments to '@patch',
+# but they continue to be resolved against the originally-selected version,
+# not the updated one.
+#
+# TODO(#42360): Reconsider the change in defaults.
+
+! go get -d -u=patch example.net/a@v0.2.0 example.net/b
+stderr '^go get: example.net/a@v0.2.0 requires example.net/b@v0.2.0, not example.net/b@patch \(v0.1.1\)$'
+cmp go.mod go.mod.orig
+
+
+# -u=patch refers to the patches for the selected versions of dependencies *after*
+# applying other version changes, not the versions that were selected at the start.
+# However, it should not patch versions determined by explicit arguments.
+
+go get -d -u=patch example.net/a@v0.2.0
+go list -m all
+stdout '^example.net/a v0.2.0 '
+stdout '^example.net/b v0.2.1 '
+
+
+# "-u=patch all" should be equivalent to "all@patch", and should fail if the
+# patched versions result in a higher-than-patch upgrade.
+
+cp go.mod.orig go.mod
+! go get -u=patch all
+stderr '^go get: example.net/a@v0.1.1 \(matching all@patch\) requires example.net/b@v0.2.0, not example.net/b@v0.1.1 \(matching all@patch\)$'
+cmp go.mod go.mod.orig
+
+
+# On the other hand, "-u=patch ./..." should patch-upgrade dependencies until
+# they reach a fixed point, even if that results in higher-than-patch upgrades.
+
+go get -u=patch ./...
+go list -m all
+stdout '^example.net/a v0.1.1 '
+stdout '^example.net/b v0.2.1 '
+
+
+-- go.mod --
+module example
+
+go 1.16
+
+require (
+	example.net/a v0.1.0
+	example.net/b v0.1.0  // indirect
+)
+
+replace (
+	example.net/a v0.1.0 => ./a10
+	example.net/a v0.1.1 => ./a11
+	example.net/a v0.2.0 => ./a20
+	example.net/a v0.2.1 => ./a21
+	example.net/b v0.1.0 => ./b
+	example.net/b v0.1.1 => ./b
+	example.net/b v0.2.0 => ./b
+	example.net/b v0.2.1 => ./b
+	example.net/b v0.3.0 => ./b
+	example.net/b v0.3.1 => ./b
+)
+-- example.go --
+package example
+
+import _ "example.net/a"
+
+-- a10/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.1.0
+-- a10/a.go --
+package a
+
+import _ "example.net/b"
+
+-- a11/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.2.0  // upgraded
+-- a11/a.go --
+package a
+
+import _ "example.net/b"
+
+-- a20/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.2.0
+-- a20/a.go --
+package a
+
+import _ "example.net/b"
+
+-- a21/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.2.0  // not upgraded
+-- a21/a.go --
+package a
+
+import _ "example.net/b"
+
+-- b/go.mod --
+module example.net/b
+
+go 1.16
+-- b/b.go --
+package b
diff --git a/src/cmd/go/testdata/script/mod_get_patchbound.txt b/src/cmd/go/testdata/script/mod_get_patchbound.txt
new file mode 100644
index 0000000..4fd1ec5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_patchbound.txt
@@ -0,0 +1,84 @@
+# -u=patch will patch dependencies as far as possible, but not so far that they
+# conflict with other command-line arguments.
+
+go list -m all
+stdout '^example.net/a v0.1.0 '
+stdout '^example.net/b v0.1.0 '
+
+go get -d -u=patch example.net/a@v0.2.0
+go list -m all
+stdout '^example.net/a v0.2.0 '
+stdout '^example.net/b v0.1.1 '  # not v0.1.2, which requires …/a v0.3.0.
+
+-- go.mod --
+module example
+
+go 1.16
+
+require (
+	example.net/a v0.1.0
+	example.net/b v0.1.0 // indirect
+)
+
+replace (
+	example.net/a v0.1.0 => ./a
+	example.net/a v0.2.0 => ./a
+	example.net/a v0.3.0 => ./a
+	example.net/b v0.1.0 => ./b10
+	example.net/b v0.1.1 => ./b11
+	example.net/b v0.1.2 => ./b12
+)
+-- example.go --
+package example
+
+import _ "example.net/a"
+
+-- a/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.1.0
+-- a/a.go --
+package a
+
+import _ "example.net/b"
+
+-- b10/go.mod --
+module example.net/b
+
+go 1.16
+
+require example.net/a v0.1.0
+-- b10/b.go --
+package b
+-- b10/b_test.go --
+package b_test
+
+import _ "example.net/a"
+
+-- b11/go.mod --
+module example.net/b
+
+go 1.16
+
+require example.net/a v0.2.0
+-- b11/b.go --
+package b
+-- b11/b_test.go --
+package b_test
+
+import _ "example.net/a"
+
+-- b12/go.mod --
+module example.net/b
+
+go 1.16
+
+require example.net/a v0.3.0
+-- b12/b.go --
+package b
+-- b12/b_test.go --
+package b_test
+
+import _ "example.net/a"
diff --git a/src/cmd/go/testdata/script/mod_get_patchcycle.txt b/src/cmd/go/testdata/script/mod_get_patchcycle.txt
new file mode 100644
index 0000000..d1db56f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_patchcycle.txt
@@ -0,0 +1,64 @@
+# If a patch of a module requires a higher version of itself,
+# it should be reported as its own conflict.
+#
+# This case is weird and unlikely to occur often at all, but it should not
+# spuriously succeed.
+# (It used to print v0.1.1 but then silently upgrade to v0.2.0.)
+
+! go get example.net/a@patch
+stderr '^go get: example.net/a@patch \(v0.1.1\) requires example.net/a@v0.2.0, not example.net/a@patch \(v0.1.1\)$'  # TODO: A mention of b v0.1.0 would be nice.
+
+-- go.mod --
+module example
+
+go 1.16
+
+require example.net/a v0.1.0
+
+replace (
+	example.net/a v0.1.0 => ./a10
+	example.net/a v0.1.1 => ./a11
+	example.net/a v0.2.0 => ./a20
+	example.net/b v0.1.0 => ./b10
+)
+-- example.go --
+package example
+
+import _ "example.net/a"
+
+-- a10/go.mod --
+module example.net/a
+
+go 1.16
+-- a10/a.go --
+package a
+
+-- a11/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.1.0
+-- a11/a.go --
+package a
+
+import _ "example.net/b"
+
+-- a20/go.mod --
+module example.net/a
+
+go 1.16
+-- a20/a.go --
+package a
+
+
+-- b10/go.mod --
+module example.net/b
+
+go 1.16
+
+require example.net/a v0.2.0
+-- b10/b.go --
+package b
+
+import _ "example.net/a"
diff --git a/src/cmd/go/testdata/script/mod_get_patchmod.txt b/src/cmd/go/testdata/script/mod_get_patchmod.txt
new file mode 100644
index 0000000..e39d13a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_patchmod.txt
@@ -0,0 +1,82 @@
+# example.net/pkgremoved@v0.1.0 refers to a package.
+go get -d example.net/pkgremoved@v0.1.0
+
+go list example.net/pkgremoved
+stdout '^example.net/pkgremoved'
+
+cp go.mod go.mod.orig
+
+
+# When we resolve a new dependency on example.net/other,
+# it will change the meaning of the path "example.net/pkgremoved"
+# from a package (at v0.1.0) to only a module (at v0.2.0).
+#
+# If we simultaneously 'get' that module at the query "patch", the module should
+# be constrained to the latest patch of its originally-selected version (v0.1.0),
+# not upgraded to the latest patch of the new transitive dependency.
+
+! go get -d example.net/pkgremoved@patch example.net/other@v0.1.0
+stderr '^go get: example.net/other@v0.1.0 requires example.net/pkgremoved@v0.2.0, not example.net/pkgremoved@patch \(v0.1.1\)$'
+cmp go.mod.orig go.mod
+
+
+# However, we should be able to patch from a package to a module and vice-versa.
+
+# Package to module ...
+
+go get -d example.net/pkgremoved@v0.3.0
+go list example.net/pkgremoved
+stdout 'example.net/pkgremoved'
+
+go get -d example.net/pkgremoved@patch
+! go list example.net/pkgremoved
+
+# ... and module to package.
+
+go get -d example.net/pkgremoved@v0.4.0
+! go list example.net/pkgremoved
+
+go get -d example.net/pkgremoved@patch
+go list example.net/pkgremoved
+stdout 'example.net/pkgremoved'
+
+
+-- go.mod --
+module example
+
+go 1.16
+
+replace (
+	example.net/other v0.1.0 => ./other
+
+	example.net/pkgremoved v0.1.0 => ./prpkg
+	example.net/pkgremoved v0.1.1 => ./prpkg
+
+	example.net/pkgremoved v0.2.0 => ./prmod
+	example.net/pkgremoved v0.2.1 => ./prmod
+
+	example.net/pkgremoved v0.3.0 => ./prpkg
+	example.net/pkgremoved v0.3.1 => ./prmod
+
+	example.net/pkgremoved v0.4.0 => ./prmod
+	example.net/pkgremoved v0.4.1 => ./prpkg
+)
+-- other/go.mod --
+module example.net/other
+
+go 1.16
+
+require example.net/pkgremoved v0.2.0
+-- other/other.go --
+package other
+-- prpkg/go.mod --
+module example.net/pkgremoved
+
+go 1.16
+-- prpkg/pkgremoved.go --
+package pkgremoved
+-- prmod/go.mod --
+module example.net/pkgremoved
+-- prmod/README.txt --
+Package pkgremoved was removed in v0.2.0 and v0.3.1,
+and added in v0.1.0 and v0.4.1.
diff --git a/src/cmd/go/testdata/script/mod_get_patterns.txt b/src/cmd/go/testdata/script/mod_get_patterns.txt
new file mode 100644
index 0000000..aee4374
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_patterns.txt
@@ -0,0 +1,42 @@
+env GO111MODULE=on
+[short] skip
+
+# If a pattern doesn't match any packages provided by modules
+# in the build list, we assume the pattern matches a single module
+# whose path is a prefix of the part of the pattern before "...".
+cp go.mod.orig go.mod
+go get -d rsc.io/quote/...
+grep 'require rsc.io/quote' go.mod
+
+cp go.mod.orig go.mod
+! go get -d rsc.io/quote/x...
+stderr 'go get: module rsc.io/quote@upgrade found \(v1.5.2\), but does not contain packages matching rsc.io/quote/x...'
+! grep 'require rsc.io/quote' go.mod
+
+! go get -d rsc.io/quote/x/...
+stderr 'go get: module rsc.io/quote@upgrade found \(v1.5.2\), but does not contain packages matching rsc.io/quote/x/...'
+! grep 'require rsc.io/quote' go.mod
+
+# If a pattern matches no packages within a module, the module should not
+# be upgraded, even if the module path is a prefix of the pattern.
+cp go.mod.orig go.mod
+go mod edit -require example.com/nest@v1.0.0
+go get -d example.com/nest/sub/y...
+grep 'example.com/nest/sub v1.0.0' go.mod
+grep 'example.com/nest v1.0.0' go.mod
+
+# However, if the pattern matches the module path itself, the module
+# should be upgraded even if it contains no matching packages.
+go get -d example.com/n...t
+grep 'example.com/nest v1.1.0' go.mod
+grep 'example.com/nest/sub v1.0.0' go.mod
+
+-- go.mod.orig --
+module m
+
+go 1.13
+
+-- use/use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_pkgtags.txt b/src/cmd/go/testdata/script/mod_get_pkgtags.txt
new file mode 100644
index 0000000..c0a57f3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_pkgtags.txt
@@ -0,0 +1,116 @@
+# https://golang.org/issue/44106
+# 'go get' should fetch the transitive dependencies of packages regardless of
+# tags, but shouldn't error out if the package is missing tag-guarded
+# dependencies.
+
+# Control case: just adding the top-level module to the go.mod file does not
+# fetch its dependencies.
+
+go mod edit -require example.net/tools@v0.1.0
+! go list -deps example.net/cmd/tool
+stderr '^module example\.net/cmd provides package example\.net/cmd/tool and is replaced but not required; to add it:\n\tgo get example\.net/cmd@v0\.1\.0$'
+go mod edit -droprequire example.net/tools
+
+
+# 'go get -d' makes a best effort to fetch those dependencies, but shouldn't
+# error out if dependencies of tag-guarded files are missing.
+
+go get -d example.net/tools@v0.1.0
+
+! go list example.net/tools
+stderr '^package example.net/tools: build constraints exclude all Go files in .*[/\\]tools$'
+
+go list -tags=tools -e -deps example.net/tools
+stdout '^example.net/cmd/tool$'
+stdout '^example.net/missing$'
+
+go list -deps example.net/cmd/tool
+
+! go list example.net/missing
+stderr '^no required module provides package example.net/missing; to add it:\n\tgo get example.net/missing$'
+
+
+# https://golang.org/issue/29268
+# 'go get' should fetch modules whose roots contain test-only packages, but
+# without the -t flag shouldn't error out if the test has missing dependencies.
+
+go get -d example.net/testonly@v0.1.0
+
+# With the -t flag, the test dependencies must resolve successfully.
+! go get -d -t example.net/testonly@v0.1.0
+stderr '^example.net/testonly tested by\n\texample.net/testonly\.test imports\n\texample.net/missing: cannot find module providing package example.net/missing$'
+
+
+# 'go get -d' should succeed for a module path that does not contain a package,
+# but fail for a non-package subdirectory of a module.
+
+! go get -d example.net/missing/subdir@v0.1.0
+stderr '^go get: module example.net/missing@v0.1.0 found \(replaced by ./missing\), but does not contain package example.net/missing/subdir$'
+
+go get -d example.net/missing@v0.1.0
+
+
+# Getting the subdirectory should continue to fail even if the corresponding
+# module is already present in the build list.
+
+! go get -d example.net/missing/subdir@v0.1.0
+stderr '^go get: module example.net/missing@v0.1.0 found \(replaced by ./missing\), but does not contain package example.net/missing/subdir$'
+
+
+-- go.mod --
+module example.net/m
+
+go 1.15
+
+replace (
+	example.net/tools v0.1.0 => ./tools
+	example.net/cmd v0.1.0 => ./cmd
+	example.net/testonly v0.1.0 => ./testonly
+	example.net/missing v0.1.0 => ./missing
+)
+
+-- tools/go.mod --
+module example.net/tools
+
+go 1.15
+
+// Requirements intentionally omitted.
+
+-- tools/tools.go --
+// +build tools
+
+package tools
+
+import (
+	_ "example.net/cmd/tool"
+	_ "example.net/missing"
+)
+
+-- cmd/go.mod --
+module example.net/cmd
+
+go 1.16
+-- cmd/tool/tool.go --
+package main
+
+func main() {}
+
+-- testonly/go.mod --
+module example.net/testonly
+
+go 1.15
+-- testonly/testonly_test.go --
+package testonly_test
+
+import _ "example.net/missing"
+
+func Test(t *testing.T) {}
+
+-- missing/go.mod --
+module example.net/missing
+
+go 1.15
+-- missing/README.txt --
+There are no Go source files here.
+-- missing/subdir/README.txt --
+There are no Go source files here either.
diff --git a/src/cmd/go/testdata/script/mod_get_prefer_incompatible.txt b/src/cmd/go/testdata/script/mod_get_prefer_incompatible.txt
new file mode 100644
index 0000000..be3db42
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_prefer_incompatible.txt
@@ -0,0 +1,29 @@
+# Verifies golang.org/issue/37574.
+
+# If we are already using an +incompatible version, we shouldn't look up
+# a lower compatible version when upgrading.
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod.orig go.mod
+grep '^example.com/incompatiblewithsub v2\.0\.0\+incompatible' go.sum
+! grep '^example.com/incompatiblewithsub v1.0.0' go.sum
+
+go get -d example.com/incompatiblewithsub/sub
+cmp go.mod.orig go.mod
+! grep '^example.com/incompatiblewithsub v1.0.0' go.sum
+
+# TODO(golang.org/issue/31580): the 'go get' command above should not change
+# go.sum. However, as part of the query above, we download example.com@v1.0.0,
+# an unrelated module, since it's a possible prefix. The sum for that module
+# should not be written to go.sum.
+
+-- go.mod --
+module m
+
+go 1.15
+
+require example.com/incompatiblewithsub v2.0.0+incompatible
+-- use.go --
+package use
+
+import _ "example.com/incompatiblewithsub/sub"
diff --git a/src/cmd/go/testdata/script/mod_get_private_vcs.txt b/src/cmd/go/testdata/script/mod_get_private_vcs.txt
new file mode 100644
index 0000000..514b0a7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_private_vcs.txt
@@ -0,0 +1,11 @@
+env GO111MODULE=on
+
+# Testing stderr for git ls-remote; turn off proxy.
+[!net] skip
+[!exec:git] skip
+env GOPROXY=direct
+
+! go get github.com/golang/nonexist
+stderr 'Confirm the import path was entered correctly.'
+stderr 'If this is a private repository, see https://golang.org/doc/faq#git_https for additional information.'
+! stdout .
diff --git a/src/cmd/go/testdata/script/mod_get_promote_implicit.txt b/src/cmd/go/testdata/script/mod_get_promote_implicit.txt
new file mode 100644
index 0000000..10ca659
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_promote_implicit.txt
@@ -0,0 +1,92 @@
+cp go.mod.orig go.mod
+
+# If we list a package in an implicit dependency imported from the main module,
+# we should get an error because the dependency should have an explicit
+# requirement.
+go list -m indirect-with-pkg
+stdout '^indirect-with-pkg v1.0.0 => ./indirect-with-pkg$'
+! go list ./use-indirect
+stderr '^go: m/use-indirect: package indirect-with-pkg imported from implicitly required module; to add missing requirements, run:\n\tgo get indirect-with-pkg@v1.0.0$'
+
+# We can promote the implicit requirement by getting the importing package.
+# NOTE: the hint recommends getting the imported package (tested below) since
+# it's more obvious and doesn't require -d. However, that adds an '// indirect'
+# comment on the requirement.
+go get -d m/use-indirect
+cmp go.mod go.mod.use
+cp go.mod.orig go.mod
+
+# We can also promote implicit requirements using 'go get' on them, or their
+# packages. This gives us "// indirect" requirements, since 'go get' doesn't
+# know they're needed by the main module. See #43131 for the rationale.
+# The hint above recommends this because it's more obvious usage and doesn't
+# require the -d flag.
+go get -d indirect-with-pkg indirect-without-pkg
+cmp go.mod go.mod.indirect
+
+-- go.mod.orig --
+module m
+
+go 1.16
+
+require direct v1.0.0
+
+replace (
+	direct v1.0.0 => ./direct
+	indirect-with-pkg v1.0.0 => ./indirect-with-pkg
+	indirect-without-pkg v1.0.0 => ./indirect-without-pkg
+)
+-- go.mod.use --
+module m
+
+go 1.16
+
+require (
+	direct v1.0.0
+	indirect-with-pkg v1.0.0
+)
+
+replace (
+	direct v1.0.0 => ./direct
+	indirect-with-pkg v1.0.0 => ./indirect-with-pkg
+	indirect-without-pkg v1.0.0 => ./indirect-without-pkg
+)
+-- go.mod.indirect --
+module m
+
+go 1.16
+
+require (
+	direct v1.0.0
+	indirect-with-pkg v1.0.0 // indirect
+	indirect-without-pkg v1.0.0 // indirect
+)
+
+replace (
+	direct v1.0.0 => ./direct
+	indirect-with-pkg v1.0.0 => ./indirect-with-pkg
+	indirect-without-pkg v1.0.0 => ./indirect-without-pkg
+)
+-- use-indirect/use-indirect.go --
+package use
+
+import _ "indirect-with-pkg"
+-- direct/go.mod --
+module direct
+
+go 1.16
+
+require (
+	indirect-with-pkg v1.0.0
+	indirect-without-pkg v1.0.0
+)
+-- indirect-with-pkg/go.mod --
+module indirect-with-pkg
+
+go 1.16
+-- indirect-with-pkg/p.go --
+package p
+-- indirect-without-pkg/go.mod --
+module indirect-without-pkg
+
+go 1.16
diff --git a/src/cmd/go/testdata/script/mod_get_pseudo.txt b/src/cmd/go/testdata/script/mod_get_pseudo.txt
new file mode 100644
index 0000000..582837a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_pseudo.txt
@@ -0,0 +1,82 @@
+env GO111MODULE=on
+
+# Testing git->module converter's generation of +incompatible tags; turn off proxy.
+[!net] skip
+[!exec:git] skip
+env GOPROXY=direct
+env GOSUMDB=off
+
+# We can resolve the @master branch without unshallowing the local repository
+# (even with older gits), so try that before we do anything else.
+# (This replicates https://golang.org/issue/26713 with git 2.7.4.)
+go get -d github.com/rsc/legacytest@master
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.1-0\.\d{14}-7303f7796364\+incompatible$'
+
+# get should include incompatible tags in "latest" calculation.
+go mod edit -droprequire github.com/rsc/legacytest
+go get -d github.com/rsc/legacytest@latest
+go list
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.0\+incompatible$'
+
+# v2.0.1-0.pseudo+incompatible
+go get -d ...test@7303f77
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.1-0\.\d{14}-7303f7796364\+incompatible$'
+
+# v2.0.0+incompatible by tag+incompatible
+go get -d ...test@v2.0.0+incompatible
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.0\+incompatible$'
+
+# v2.0.0+incompatible by tag
+go get -d ...test@v2.0.0
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.0\+incompatible$'
+
+# v2.0.0+incompatible by hash (back on master)
+go get -d ...test@d7ae1e4
+go list -m all
+stdout '^github.com/rsc/legacytest v2\.0\.0\+incompatible$'
+
+# v1.2.1-0.pseudo
+go get -d ...test@d2d4c3e
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.2\.1-0\.\d{14}-d2d4c3ea6623$'
+
+# v1.2.0
+go get -d ...test@9f6f860
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.2\.0$'
+
+# v1.1.0-pre.0.pseudo
+go get -d ...test@fb3c628
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.1\.0-pre\.0\.\d{14}-fb3c628075e3$'
+
+# v1.1.0-pre (no longer on master)
+go get -d ...test@731e3b1
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.1\.0-pre$'
+
+# v1.0.1-0.pseudo
+go get -d ...test@fa4f5d6
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.0\.1-0\.\d{14}-fa4f5d6a71c6$'
+
+# v1.0.0
+go get -d ...test@7fff7f3
+go list -m all
+stdout '^github.com/rsc/legacytest v1\.0\.0$'
+
+# v0.0.0-pseudo
+go get -d ...test@52853eb
+go list -m all
+stdout '^github.com/rsc/legacytest v0\.0\.0-\d{14}-52853eb7b552$'
+
+-- go.mod --
+module x
+-- x.go --
+package x
+import "github.com/rsc/legacytest"
diff --git a/src/cmd/go/testdata/script/mod_get_pseudo_other_branch.txt b/src/cmd/go/testdata/script/mod_get_pseudo_other_branch.txt
new file mode 100644
index 0000000..0fbd041
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_pseudo_other_branch.txt
@@ -0,0 +1,67 @@
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# Testing that a pseudo-version is based on the semantically-latest
+# tag that appears in any commit that is a (transitive) parent of the commit
+# supplied to 'go get', regardless of branches
+
+[!net] skip
+[!exec:git] skip
+
+# For this test repository:
+#  tag v0.2.1 is most recent tag on master itself
+#  tag v0.2.2 is on branch2, which was then merged to master
+#  master is a merge commit with both tags as parents
+#
+# The pseudo-version hence sorts immediately after v0.2.2 rather
+# than v0.2.1, even though the v0.2.2 tag is not on master.
+
+go get -d vcs-test.golang.org/git/tagtests.git@master
+go list -m all
+stdout '^vcs-test.golang.org/git/tagtests.git v0.2.3-0\.'
+
+-- go.mod --
+module x
+
+go 1.12
+-- x.go --
+package x
+
+import _ "vcs-test.golang.org/git/tagtests.git"
+-- gen_testtags.sh --
+#!/bin/bash
+
+# This is not part of the test.
+# Run this to generate and update the repository on vcs-test.golang.org.
+
+set -euo pipefail
+cd "$(dirname "$0")"
+rm -rf tagtests
+mkdir tagtests
+cd tagtests
+
+git init
+echo module vcs-test.golang.org/git/tagtests.git >go.mod
+echo package tagtests >tagtests.go
+git add go.mod tagtests.go
+git commit -m 'create module tagtests'
+
+git branch b
+
+echo v0.2.1 >v0.2.1
+git add v0.2.1
+git commit -m v0.2.1
+git tag v0.2.1
+
+git checkout b
+echo v0.2.2 >v0.2.2
+git add v0.2.2
+git commit -m v0.2.2
+git tag v0.2.2
+
+git checkout master
+git merge b -m merge
+
+zip -r ../tagtests.zip .
+gsutil cp ../tagtests.zip gs://vcs-test/git/tagtests.zip
diff --git a/src/cmd/go/testdata/script/mod_get_pseudo_prefix.txt b/src/cmd/go/testdata/script/mod_get_pseudo_prefix.txt
new file mode 100644
index 0000000..b78e6e6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_pseudo_prefix.txt
@@ -0,0 +1,64 @@
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# Testing that a pseudo-version is based on the semantically-latest
+# prefixed tag in any commit that is a parent of the commit supplied
+# to 'go get', when using a repo with go.mod in a sub directory.
+
+[!net] skip
+[!exec:git] skip
+
+# For this test repository go.mod resides in sub/ (only):
+#  master is not tagged
+#  tag v0.2.0 is most recent tag before master
+#  tag sub/v0.0.10 is most recent tag before v0.2.0
+#
+# The pseudo-version is based on sub/v0.0.10, since v0.2.0 doesn't
+# contain the prefix.
+go get -d vcs-test.golang.org/git/prefixtagtests.git/sub
+go list -m all
+stdout '^vcs-test.golang.org/git/prefixtagtests.git/sub v0.0.10$'
+
+go get -d -u vcs-test.golang.org/git/prefixtagtests.git/sub@master
+go list -m all
+stdout '^vcs-test.golang.org/git/prefixtagtests.git/sub v0.0.11-0\.'
+
+-- go.mod --
+module x
+
+go 1.12
+-- x.go --
+package x
+
+import _ "vcs-test.golang.org/prefixtagtests.git/sub"
+-- gen_prefixtagtests.sh --
+#!/bin/bash
+
+# This is not part of the test.
+# Run this to generate and update the repository on vcs-test.golang.org.
+
+set -euo pipefail
+cd "$(dirname "$0")"
+rm -rf prefixtagtests
+mkdir prefixtagtests
+cd prefixtagtests
+
+git init
+mkdir sub
+echo module vcs-test.golang.org/git/prefixtagtests.git/sub >sub/go.mod
+echo package sub >sub/sub.go
+git add sub
+git commit -m 'create module sub'
+for i in v0.1.0 sub/v0.0.9 sub/v0.0.10 v0.2.0; do
+  echo $i >status
+  git add status
+  git commit -m $i
+  git tag $i
+done
+echo 'after last tag' >status
+git add status
+git commit -m 'after last tag'
+
+zip -r ../prefixtagtests.zip .
+gsutil cp ../prefixtagtests.zip gs://vcs-test/git/prefixtagtests.zip
diff --git a/src/cmd/go/testdata/script/mod_get_replaced.txt b/src/cmd/go/testdata/script/mod_get_replaced.txt
new file mode 100644
index 0000000..d97f3f1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_replaced.txt
@@ -0,0 +1,111 @@
+cp go.mod go.mod.orig
+
+env oldGOPROXY=$GOPROXY
+
+# If a wildcard replacement exists for an otherwise-nonexistent module,
+# 'go get' should resolve it to the minimum valid pseudo-version.
+
+go mod edit -replace=example.com/x=./x
+go get -d example.com/x
+
+go list -m example.com/x
+stdout '^example.com/x v0.0.0-00010101000000-000000000000 '
+
+# If specific-version replacements exist, the highest matching version should be used.
+go mod edit -replace=example.com/x@v0.1.0=./x
+go mod edit -replace=example.com/x@v0.2.0=./x
+
+go get -d example.com/x
+go list -m example.com/x
+stdout '^example.com/x v0.2.0 '
+
+go get -d example.com/x@<v0.2.0
+go list -m example.com/x
+stdout '^example.com/x v0.1.0 '
+
+
+# The same should work with GOPROXY=off.
+
+env GOPROXY=off
+cp go.mod.orig go.mod
+
+go mod edit -replace=example.com/x=./x
+go get -d example.com/x
+
+go list -m example.com/x
+stdout '^example.com/x v0.0.0-00010101000000-000000000000 '
+
+# If specific-version replacements exist, the highest matching version should be used.
+go mod edit -replace=example.com/x@v0.1.0=./x
+go mod edit -replace=example.com/x@v0.2.0=./x
+
+go get -d example.com/x
+go list -m example.com/x
+stdout '^example.com/x v0.2.0 '
+
+go get -d example.com/x@<v0.2.0
+go list -m example.com/x
+stdout '^example.com/x v0.1.0 '
+
+
+# Replacements should also be listed as known versions, and 'go get' should sort
+# them in with ordinary versions.
+
+env GOPROXY=$oldGOPROXY
+
+cp go.mod.orig go.mod
+go list -versions -m rsc.io/quote
+stdout 'v1.3.0 v1.4.0'
+
+go get -d rsc.io/quote@v1.3
+go list -m rsc.io/quote
+stdout '^rsc.io/quote v1.3.0'
+
+go mod edit -replace rsc.io/quote@v1.3.1=rsc.io/quote@v1.4.0
+
+go list -versions -m rsc.io/quote
+stdout 'v1.3.0 v1.3.1 v1.4.0'
+
+go get -d rsc.io/quote@v1.3
+go list -m rsc.io/quote
+stdout '^rsc.io/quote v1.3.1 '
+
+go get -d rsc.io/quote@>v1.3.1
+go list -m rsc.io/quote
+stdout '^rsc.io/quote v1.4.0'
+
+
+# Replacements should allow 'go get' to work even with dotless module paths.
+
+cp go.mod.orig go.mod
+
+! go list example
+stderr '^package example is not in GOROOT \(.*\)$'
+! go get -d example
+stderr '^go get: malformed module path "example": missing dot in first path element$'
+
+go mod edit -replace example@v0.1.0=./example
+
+! go list example
+stderr '^module example provides package example and is replaced but not required; to add it:\n\tgo get example@v0.1.0$'
+
+go get -d example
+go list -m example
+stdout '^example v0.1.0 '
+
+
+-- go.mod --
+module example.com
+
+go 1.16
+-- x/go.mod --
+module example.com/x
+
+go 1.16
+-- x/x.go --
+package x
+-- example/go.mod --
+module example
+go 1.16
+-- example/example.go --
+package example
diff --git a/src/cmd/go/testdata/script/mod_get_retract.txt b/src/cmd/go/testdata/script/mod_get_retract.txt
new file mode 100644
index 0000000..560fa7b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_retract.txt
@@ -0,0 +1,59 @@
+# 'go get pkg' should not upgrade to a retracted version.
+cp go.mod.orig go.mod
+go mod edit -require example.com/retract/self/prev@v1.1.0
+go get -d example.com/retract/self/prev
+go list -m example.com/retract/self/prev
+stdout '^example.com/retract/self/prev v1.1.0$'
+
+# 'go get pkg' should not downgrade from a retracted version when no higher
+# version is available.
+cp go.mod.orig go.mod
+go mod edit -require example.com/retract/self/prev@v1.9.0
+go get -d example.com/retract/self/prev
+stderr '^go: warning: example.com/retract/self/prev@v1.9.0: retracted by module author: self$'
+stderr '^go: to switch to the latest unretracted version, run:\n\tgo get example.com/retract/self/prev@latest\n$'
+go list -m example.com/retract/self/prev
+stdout '^example.com/retract/self/prev v1.9.0$'
+
+# 'go get pkg@latest' should downgrade from a retracted version.
+cp go.mod.orig go.mod
+go mod edit -require example.com/retract/self/prev@v1.9.0
+go get -d example.com/retract/self/prev@latest
+go list -m example.com/retract/self/prev
+stdout '^example.com/retract/self/prev v1.1.0$'
+
+# 'go get pkg@version' should update to a specific version, even if that
+# version is retracted.
+cp go.mod.orig go.mod
+go get -d example.com/retract@v1.0.0-bad
+stderr '^go: warning: example.com/retract@v1.0.0-bad: retracted by module author: bad$'
+go list -m example.com/retract
+stdout '^example.com/retract v1.0.0-bad$'
+
+# 'go get -u' should not downgrade from a retracted version when no higher
+# version is available.
+cp go.mod.orig go.mod
+go mod edit -require example.com/retract/self/prev@v1.9.0
+go get -d -u ./use
+stderr '^go: warning: example.com/retract/self/prev@v1.9.0: retracted by module author: self$'
+go list -m example.com/retract/self/prev
+stdout '^example.com/retract/self/prev v1.9.0$'
+
+# 'go get' should warn if a module needed to build named packages is retracted.
+# 'go get' should not warn about unrelated modules.
+go get -d ./empty
+! stderr retracted
+go get -d ./use
+stderr '^go: warning: example.com/retract/self/prev@v1.9.0: retracted by module author: self$'
+
+-- go.mod.orig --
+module example.com/use
+
+go 1.15
+
+-- use/use.go --
+package use
+
+import _ "example.com/retract/self/prev"
+-- empty/empty.go --
+package empty
diff --git a/src/cmd/go/testdata/script/mod_get_retract_ambiguous.txt b/src/cmd/go/testdata/script/mod_get_retract_ambiguous.txt
new file mode 100644
index 0000000..b49ba54
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_retract_ambiguous.txt
@@ -0,0 +1,10 @@
+! go get -d example.com/retract/ambiguous/other
+stderr 'ambiguous import: found package example.com/retract/ambiguous/nested in multiple modules:'
+stderr '^go: warning: example.com/retract/ambiguous/nested@v1.9.0-bad: retracted by module author: nested modules are bad$'
+
+-- go.mod --
+module example.com/use
+
+go 1.16
+
+require example.com/retract/ambiguous/nested v1.9.0-bad
diff --git a/src/cmd/go/testdata/script/mod_get_split.txt b/src/cmd/go/testdata/script/mod_get_split.txt
new file mode 100644
index 0000000..f4e7661
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_split.txt
@@ -0,0 +1,157 @@
+cp go.mod go.mod.orig
+
+
+# 'go get' on a package already provided by the build list should update
+# the module already in the build list, not fail with an ambiguous import error.
+
+go get -d example.net/split/nested@patch
+go list -m all
+stdout '^example.net/split v0.2.1 '
+! stdout '^example.net/split/nested'
+
+# We should get the same behavior if we use a pattern that matches only that package.
+
+cp go.mod.orig go.mod
+
+go get -d example.net/split/nested/...@patch
+go list -m all
+stdout '^example.net/split v0.2.1 '
+! stdout '^example.net/split/nested'
+
+
+# If we request a version for which the package only exists in one particular module,
+# we should add that one particular module but not resolve import ambiguities.
+#
+# In particular, if the module that previously provided the package has a
+# matching version, but does not itself match the pattern and contains no
+# matching packages, we should not change its version. (We should *not* downgrade
+# module example.net/split to v0.1.0, despite the fact that
+# example.net/split v0.2.0 currently provides the package with the requested path.)
+#
+# TODO(#27899): Maybe we should resolve the ambiguities by upgrading.
+
+cp go.mod.orig go.mod
+
+! go get -d example.net/split/nested@v0.1.0
+stderr '^example.net/split/nested: ambiguous import: found package example.net/split/nested in multiple modules:\n\texample.net/split v0.2.0 \(.*split.2[/\\]nested\)\n\texample.net/split/nested v0.1.0 \(.*nested.1\)$'
+
+# A wildcard that matches packages in some module at its selected version
+# but not at the requested version should fail.
+#
+# We can't set the module to the selected version, because that version doesn't
+# even match the query: if we ran the same query twice, we wouldn't consider the
+# module to match the wildcard during the second call, so why should we consider
+# it to match during the first one?  ('go get' should be idempotent, and if we
+# did that then it would not be.)
+#
+# But we also can't leave it where it is: the user requested that we set everything
+# matching the pattern to the given version, and right now we have packages
+# that match the pattern but *not* the version.
+#
+# That only leaves two options: we can set the module to an arbitrary version
+# (perhaps 'latest' or 'none'), or we can report an error and the let the user
+# disambiguate. We would rather not choose arbitrarily, so we do the latter.
+#
+# TODO(#27899): Should we instead upgrade or downgrade to an arbirary version?
+
+! go get -d example.net/split/nested/...@v0.1.0
+stderr '^go get: example.net/split/nested/\.\.\.@v0.1.0 matches packages in example.net/split@v0.2.0 but not example.net/split@v0.1.0: specify a different version for module example.net/split$'
+
+cmp go.mod go.mod.orig
+
+
+# If another argument resolves the ambiguity, we should be ok again.
+
+go get -d example.net/split@none example.net/split/nested@v0.1.0
+go list -m all
+! stdout '^example.net/split '
+stdout '^example.net/split/nested v0.1.0 '
+
+cp go.mod.orig go.mod
+
+go get -d example.net/split@v0.3.0 example.net/split/nested@v0.1.0
+go list -m all
+stdout '^example.net/split v0.3.0 '
+stdout '^example.net/split/nested v0.1.0 '
+
+
+# If a pattern applies to modules and to packages, we should set all matching
+# modules to the version indicated by the pattern, and also resolve packages
+# to match the pattern if possible.
+
+cp go.mod.orig go.mod
+go get -d example.net/split/nested@v0.0.0
+
+go get -d example.net/...@v0.1.0
+go list -m all
+stdout '^example.net/split v0.1.0 '
+stdout '^example.net/split/nested v0.1.0 '
+
+go get -d example.net/...
+go list -m all
+stdout '^example.net/split v0.3.0 '
+stdout '^example.net/split/nested v0.2.0 '
+
+
+# @none applies to all matching module paths,
+# regardless of whether they contain any packages.
+
+go get -d example.net/...@none
+go list -m all
+! stdout '^example.net'
+
+# Starting from no dependencies, a wildcard can resolve to an empty module with
+# the same prefix even if it contains no packages.
+
+go get -d example.net/...@none
+go get -d example.net/split/...@v0.1.0
+go list -m all
+stdout '^example.net/split v0.1.0 '
+
+
+-- go.mod --
+module m
+
+go 1.16
+
+require example.net/split v0.2.0
+
+replace (
+	example.net/split v0.1.0 => ./split.1
+	example.net/split v0.2.0 => ./split.2
+	example.net/split v0.2.1 => ./split.2
+	example.net/split v0.3.0 => ./split.3
+	example.net/split/nested v0.0.0 => ./nested.0
+	example.net/split/nested v0.1.0 => ./nested.1
+	example.net/split/nested v0.2.0 => ./nested.2
+)
+-- split.1/go.mod --
+module example.net/split
+
+go 1.16
+-- split.2/go.mod --
+module example.net/split
+
+go 1.16
+-- split.2/nested/nested.go --
+package nested
+-- split.3/go.mod --
+module example.net/split
+
+go 1.16
+-- nested.0/go.mod --
+module example.net/split/nested
+
+go 1.16
+-- nested.1/go.mod --
+module example.net/split/nested
+
+go 1.16
+-- nested.1/nested.go --
+package nested
+-- nested.2/go.mod --
+module example.net/split/nested
+
+go 1.16
+-- nested.2/nested.go --
+package nested
diff --git a/src/cmd/go/testdata/script/mod_get_sum_noroot.txt b/src/cmd/go/testdata/script/mod_get_sum_noroot.txt
new file mode 100644
index 0000000..4f1cf03
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_sum_noroot.txt
@@ -0,0 +1,11 @@
+# When 'go get' is invoked on a module without a package in the root directory,
+# it should add sums for the module's go.mod file and its content to go.sum.
+# Verifies golang.org/issue/41103.
+go mod init m
+go get -d rsc.io/QUOTE
+grep '^rsc.io/QUOTE v1.5.2/go.mod ' go.sum
+grep '^rsc.io/QUOTE v1.5.2 ' go.sum
+
+# Double-check rsc.io/QUOTE does not have a root package.
+! go list -mod=readonly rsc.io/QUOTE
+stderr '^cannot find module providing package rsc.io/QUOTE: import lookup disabled by -mod=readonly$'
diff --git a/src/cmd/go/testdata/script/mod_get_svn.txt b/src/cmd/go/testdata/script/mod_get_svn.txt
new file mode 100644
index 0000000..3817fce
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_svn.txt
@@ -0,0 +1,36 @@
+[!net] skip
+[!exec:svn] skip
+
+# 'go get' will fall back to svn+ssh once svn fails over protocols like https.
+# If vcs-test.golang.org isn't in the user's known_hosts file, this will result
+# in an ssh prompt, which will stop 'go test' entirely
+#
+# Unfortunately, there isn't a way to globally disable host checking for ssh,
+# without modifying the real system's or user's configs. Changing $HOME won't
+# affect ssh either, as it ignores the environment variable entirely.
+#
+# However, a useful trick is pointing SVN_SSH to a program that doesn't exist,
+# resulting in svn skipping ssh entirely. Alternatives like
+# SVN_SSH="ssh -o StrictHostKeyChecking=no" didn't avoid the prompt.
+env SVN_SSH="svn_do_not_use_ssh"
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# Attempting to get a module zip using svn should succeed.
+go get vcs-test.golang.org/svn/hello.svn@000000000001
+exists $GOPATH/pkg/mod/cache/download/vcs-test.golang.org/svn/hello.svn/@v/v0.0.0-20170922011245-000000000001.zip
+exists $GOPATH/bin/hello.svn$GOEXE
+
+# Attempting to get a nonexistent module using svn should fail with a
+# reasonable message instead of a panic.
+! go get -d vcs-test.golang.org/svn/nonexistent.svn
+! stderr panic
+stderr 'go get vcs-test.golang.org/svn/nonexistent.svn: no matching versions for query "upgrade"'
+
+-- go.mod --
+module golang/go/issues/28943/main
+-- go.sum --
+vcs-test.golang.org/svn/hello.svn v0.0.0-20170922011245-000000000001 h1:rZjvboXMfQICKXdhx/QHqJ2Y/AQsJVrXnwGqwcTxQiw=
+vcs-test.golang.org/svn/hello.svn v0.0.0-20170922011245-000000000001/go.mod h1:0memnh/BRLuxiK2zF4rvUgz6ts/fhhB28l3ULFWPusc=
diff --git a/src/cmd/go/testdata/script/mod_get_tags.txt b/src/cmd/go/testdata/script/mod_get_tags.txt
new file mode 100644
index 0000000..e9869e3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_tags.txt
@@ -0,0 +1,45 @@
+env GO111MODULE=on
+
+[short] skip
+
+# get should add modules needed to build packages, even if those
+# dependencies are in sources excluded by build tags.
+# All build tags are considered true except "ignore".
+go mod init m
+go get -d .
+go list -m all
+stdout 'example.com/version v1.1.0'
+stdout 'rsc.io/quote v1.5.2'
+
+[short] skip
+
+# Packages that are only imported in excluded files should not be built.
+env GOCACHE=$WORK/gocache  # Looking for compile commands, so need a clean cache.
+go get -n -x .
+stderr 'compile.* -p m '
+! stderr 'compile.* -p example.com/version '
+! stderr 'compile.* -p rsc.io/quote '
+
+-- empty.go --
+package m
+
+-- excluded.go --
+// +build windows,mips
+
+package m
+
+import _ "example.com/version"
+
+-- tools.go --
+// +build tools
+
+package tools
+
+import _ "rsc.io/quote"
+
+-- ignore.go --
+// +build ignore
+
+package ignore
+
+import _ "example.com/doesnotexist"
diff --git a/src/cmd/go/testdata/script/mod_get_test.txt b/src/cmd/go/testdata/script/mod_get_test.txt
new file mode 100644
index 0000000..23722bd
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_test.txt
@@ -0,0 +1,58 @@
+env GO111MODULE=on
+
+# By default, 'go get' should ignore tests
+cp go.mod.empty go.mod
+go get -d m/a
+! grep rsc.io/quote go.mod
+
+# 'go get -t' should consider test dependencies of the named package.
+cp go.mod.empty go.mod
+go get -d -t m/a
+grep 'rsc.io/quote v1.5.2$' go.mod
+
+# 'go get -t' should not consider test dependencies of imported packages,
+# including packages imported from tests.
+cp go.mod.empty go.mod
+go get -d -t m/b
+! grep rsc.io/quote go.mod
+
+# 'go get -t -u' should update test dependencies of the named package.
+cp go.mod.empty go.mod
+go mod edit -require=rsc.io/quote@v1.5.1
+go get -d -t -u m/a
+grep 'rsc.io/quote v1.5.2$' go.mod
+
+# 'go get -t -u' should not add or update test dependencies
+# of imported packages, including packages imported from tests.
+cp go.mod.empty go.mod
+go get -d -t -u m/b
+! grep rsc.io/quote go.mod
+go mod edit -require=rsc.io/quote@v1.5.1
+go get -d -t -u m/b
+grep 'rsc.io/quote v1.5.1$' go.mod
+
+# 'go get all' should consider test dependencies with or without -t.
+cp go.mod.empty go.mod
+go get -d all
+grep 'rsc.io/quote v1.5.2$' go.mod
+
+-- go.mod.empty --
+module m
+
+-- a/a.go --
+package a
+
+-- a/a_test.go --
+package a_test
+
+import _ "rsc.io/quote"
+
+-- b/b.go --
+package b
+
+import _ "m/a"
+
+-- b/b_test.go --
+package b_test
+
+import _ "m/a"
diff --git a/src/cmd/go/testdata/script/mod_get_too_many_redirects.txt b/src/cmd/go/testdata/script/mod_get_too_many_redirects.txt
new file mode 100644
index 0000000..9cbe0d2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_too_many_redirects.txt
@@ -0,0 +1,10 @@
+env GO111MODULE=on
+env GOPROXYBASE=$GOPROXY
+env GOPROXY=$GOPROXYBASE/redirect/11
+env GOSUMDB=off
+
+! go get -d rsc.io/quote@v1.2.0
+stderr 'stopped after 10 redirects'
+
+env GOPROXY=$GOPROXYBASE/redirect/9
+go get -d rsc.io/quote@v1.2.0
diff --git a/src/cmd/go/testdata/script/mod_get_trailing_slash.txt b/src/cmd/go/testdata/script/mod_get_trailing_slash.txt
new file mode 100644
index 0000000..c536693
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_trailing_slash.txt
@@ -0,0 +1,37 @@
+# go list should succeed to load a package ending with ".go" if the path does
+# not correspond to an existing local file. Listing a pattern ending with
+# ".go/" should try to list a package regardless of whether a file exists at the
+# path without the suffixed "/" or not.
+go list example.com/dotgo.go
+stdout ^example.com/dotgo.go$
+go list example.com/dotgo.go/
+stdout ^example.com/dotgo.go$
+
+# go get -d should succeed in either case, with or without a version.
+# Arguments are interpreted as packages or package patterns with versions,
+# not source files.
+go get -d example.com/dotgo.go
+go get -d example.com/dotgo.go/
+go get -d example.com/dotgo.go@v1.0.0
+go get -d example.com/dotgo.go/@v1.0.0
+
+# go get (without -d) should also succeed in either case.
+[short] skip
+go get example.com/dotgo.go
+go get example.com/dotgo.go/
+go get example.com/dotgo.go@v1.0.0
+go get example.com/dotgo.go/@v1.0.0
+
+-- go.mod --
+module m
+
+go 1.13
+
+require example.com/dotgo.go v1.0.0
+-- go.sum --
+example.com/dotgo.go v1.0.0 h1:XKJfs0V8x2PvY2tX8bJBCEbCDLnt15ma2onwhVpew/I=
+example.com/dotgo.go v1.0.0/go.mod h1:Qi6z/X3AC5vHiuMt6HF2ICx3KhIBGrMdrA7YoPDKqR0=
+-- use.go --
+package use
+
+import _ "example.com/dotgo.go"
diff --git a/src/cmd/go/testdata/script/mod_get_upgrade.txt b/src/cmd/go/testdata/script/mod_get_upgrade.txt
new file mode 100644
index 0000000..eeb6d6f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_upgrade.txt
@@ -0,0 +1,46 @@
+env GO111MODULE=on
+
+go get -d rsc.io/quote@v1.5.1
+go list -m all
+stdout 'rsc.io/quote v1.5.1'
+grep 'rsc.io/quote v1.5.1$' go.mod
+
+# get -u should update dependencies of the package in the current directory
+go get -d -u
+grep 'rsc.io/quote v1.5.2$' go.mod
+grep 'golang.org/x/text [v0-9a-f\.-]+ // indirect' go.mod
+
+# get -u rsc.io/sampler should update only sampler's dependencies
+cp go.mod-v1.5.1 go.mod
+go get -d -u rsc.io/sampler
+grep 'rsc.io/quote v1.5.1$' go.mod
+grep 'golang.org/x/text [v0-9a-f\.-]+ // indirect' go.mod
+
+# move to a pseudo-version after any tags
+go get -d rsc.io/quote@dd9747d
+grep 'rsc.io/quote v0.0.0-20180628003336-dd9747d19b04' go.mod
+
+# get -u should not jump off newer pseudo-version to earlier tag
+go get -d -u
+grep 'rsc.io/quote v0.0.0-20180628003336-dd9747d19b04' go.mod
+
+# move to earlier pseudo-version
+go get -d rsc.io/quote@e7a685a342
+grep 'rsc.io/quote v0.0.0-20180214005133-e7a685a342c0' go.mod
+
+# get -u should jump off earlier pseudo-version to newer tag
+go get -d -u
+grep 'rsc.io/quote v1.5.2' go.mod
+
+-- go.mod --
+module x
+require rsc.io/quote v1.1.0
+
+-- go.mod-v1.5.1 --
+module x
+require rsc.io/quote v1.5.1
+
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_get_upgrade_pseudo.txt b/src/cmd/go/testdata/script/mod_get_upgrade_pseudo.txt
new file mode 100644
index 0000000..f5f415a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_upgrade_pseudo.txt
@@ -0,0 +1,70 @@
+env GO111MODULE=on
+
+# For this test module there are three versions:
+#   * v0.1.1-0.20190429073117-b5426c86b553
+#   * v0.1.0
+#   * v0.0.0-20190430073000-30950c05d534
+# Only v0.1.0 is tagged.
+#
+# The v0.1.1 pseudo-version is semantically higher than the latest tag.
+# The v0.0.0 pseudo-version is chronologically newer.
+
+# Start at v0.1.1-0.20190429073117-b5426c86b553
+go get -d example.com/pseudoupgrade@b5426c8
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'
+
+# 'get -u' should not downgrade to the (lower) tagged version.
+go get -d -u
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'
+
+# 'get example.com/pseudoupgrade@upgrade' should not downgrade.
+go get -d example.com/pseudoupgrade@upgrade
+go list -m all
+stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'
+
+# 'get example.com/pseudoupgrade' should not downgrade.
+# This is equivalent to 'get example.com/pseudoupgrade@upgrade'.
+go get -d example.com/pseudoupgrade
+go list -m all
+stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'
+
+# 'get example.com/pseudoupgrade@latest' should downgrade.
+# @latest should not consider the current version.
+go get -d example.com/pseudoupgrade@latest
+go list -m all
+stdout '^example.com/pseudoupgrade v0.1.0$'
+
+# We should observe the same behavior with the newer pseudo-version.
+go get -d example.com/pseudoupgrade@v0.0.0-20190430073000-30950c05d534
+
+# 'get -u' should not downgrade to the chronologically older tagged version.
+go get -d -u
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.0.0-20190430073000-30950c05d534$'
+
+# 'get example.com/pseudoupgrade@upgrade should not downgrade.
+go get -d example.com/pseudoupgrade@upgrade
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.0.0-20190430073000-30950c05d534$'
+
+# 'get example.com/pseudoupgrade' should not downgrade.
+go get -d example.com/pseudoupgrade
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.0.0-20190430073000-30950c05d534$'
+
+# 'get example.com/pseudoupgrade@latest' should downgrade.
+go get -d example.com/pseudoupgrade@latest
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.1.0$'
+
+-- go.mod --
+module x
+
+go 1.12
+
+-- main.go --
+package x
+
+import _ "example.com/pseudoupgrade"
diff --git a/src/cmd/go/testdata/script/mod_get_wild.txt b/src/cmd/go/testdata/script/mod_get_wild.txt
new file mode 100644
index 0000000..78c645c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_get_wild.txt
@@ -0,0 +1,95 @@
+# This test covers a crazy edge-case involving wildcards and multiple passes of
+# patch-upgrades, but if we get it right we probably get many other edge-cases
+# right too.
+
+go list -m all
+stdout '^example.net/a v0.1.0 '
+! stdout '^example.net/b '
+
+
+# Requesting pattern example.../b by itself fails: there is no such module
+# already in the build list, and the wildcard in the first element prevents us
+# from attempting to resolve a new module whose path is a prefix of the pattern.
+
+! go get -d -u=patch example.../b@upgrade
+stderr '^go get: no modules to query for example\.\.\./b@upgrade because first path element contains a wildcard$'
+
+
+# Patching . causes a patch to example.net/a, which introduces a new match
+# for example.net/b/..., which is itself patched and causes another upgrade to
+# example.net/a, which is then patched again.
+
+go get -d -u=patch . example.../b@upgrade
+go list -m all
+stdout '^example.net/a v0.2.1 '  # upgraded by dependency of b and -u=patch
+stdout '^example.net/b v0.2.0 '  # introduced by patch of a and upgraded by wildcard
+
+
+-- go.mod --
+module example
+
+go 1.16
+
+require example.net/a v0.1.0
+
+replace (
+	example.net/a v0.1.0 => ./a10
+	example.net/a v0.1.1 => ./a11
+	example.net/a v0.2.0 => ./a20
+	example.net/a v0.2.1 => ./a20
+	example.net/b v0.1.0 => ./b1
+	example.net/b v0.1.1 => ./b1
+	example.net/b v0.2.0 => ./b2
+)
+-- example.go --
+package example
+
+import _ "example.net/a"
+
+-- a10/go.mod --
+module example.net/a
+
+go 1.16
+-- a10/a.go --
+package a
+
+-- a11/go.mod --
+module example.net/a
+
+go 1.16
+
+require example.net/b v0.1.0
+-- a11/a.go --
+package a
+-- a11/unimported/unimported.go --
+package unimported
+
+import _ "example.net/b"
+
+
+-- a20/go.mod --
+module example.net/a
+
+go 1.16
+-- a20/a.go --
+package a
+
+-- b1/go.mod --
+module example.net/b
+
+go 1.16
+-- b1/b.go --
+package b
+
+-- b2/go.mod --
+module example.net/b
+
+go 1.16
+
+require example.net/a v0.2.0
+-- b2/b.go --
+package b
+-- b2/b_test.go --
+package b_test
+
+import _ "example.net/a"
diff --git a/src/cmd/go/testdata/script/mod_getmode_vendor.txt b/src/cmd/go/testdata/script/mod_getmode_vendor.txt
new file mode 100644
index 0000000..d3df207
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_getmode_vendor.txt
@@ -0,0 +1,30 @@
+env GO111MODULE=on
+
+go get -d rsc.io/quote@v1.5.1
+go mod vendor
+env GOPATH=$WORK/empty
+env GOPROXY=file:///nonexist
+
+go list -mod=vendor
+go list -mod=vendor -f '{{with .Module}}{{.Path}} {{.Version}}{{end}} {{.Dir}}' all
+stdout '^rsc.io/quote v1.5.1 .*vendor[\\/]rsc.io[\\/]quote$'
+stdout '^golang.org/x/text v0.0.0.* .*vendor[\\/]golang.org[\\/]x[\\/]text[\\/]language$'
+
+! go list -mod=vendor -m rsc.io/quote@latest
+stderr 'go list -m: rsc.io/quote@latest: cannot query module due to -mod=vendor'
+! go get -mod=vendor -u
+stderr 'flag provided but not defined: -mod'
+
+# Since we don't have a complete module graph, 'go list -m' queries
+# that require the complete graph should fail with a useful error.
+! go list -mod=vendor -m all
+stderr 'go list -m: can''t compute ''all'' using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+! go list -mod=vendor -m ...
+stderr 'go list -m: can''t match module patterns using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+-- go.mod --
+module x
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_getx.txt b/src/cmd/go/testdata/script/mod_getx.txt
new file mode 100644
index 0000000..ccb8d13
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_getx.txt
@@ -0,0 +1,14 @@
+[short] skip
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# 'go get -x' should log URLs with an HTTP or HTTPS scheme.
+# A bug had caused us to log schemeless URLs instead.
+go get -x -d golang.org/x/text@v0.1.0
+stderr '^# get https://golang.org/x/text\?go-get=1$'
+stderr '^# get https://golang.org/x/text\?go-get=1: 200 OK \([0-9.]+s\)$'
+! stderr '^# get //.*'
diff --git a/src/cmd/go/testdata/script/mod_git_export_subst.txt b/src/cmd/go/testdata/script/mod_git_export_subst.txt
new file mode 100644
index 0000000..a28b4f2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_git_export_subst.txt
@@ -0,0 +1,21 @@
+env GO111MODULE=on
+env GOPROXY=direct
+
+# Testing that git export-subst is disabled
+[!net] skip
+[!exec:git] skip
+go build
+
+-- x.go --
+package x
+
+import _ "github.com/jasonkeene/export-subst"
+
+-- go.mod --
+module x
+
+require github.com/jasonkeene/export-subst v0.0.0-20180927204031-5845945ec626
+
+-- go.sum --
+github.com/jasonkeene/export-subst v0.0.0-20180927204031-5845945ec626 h1:AUkXi/xFnm7lH2pgtvVkGb7buRn1ywFHw+xDpZ29Rz0=
+github.com/jasonkeene/export-subst v0.0.0-20180927204031-5845945ec626/go.mod h1:DwJXqVtrgrQkv3Giuf2Jh4YyubVe7y41S1eOIaysTJw=
diff --git a/src/cmd/go/testdata/script/mod_go_version.txt b/src/cmd/go/testdata/script/mod_go_version.txt
new file mode 100644
index 0000000..97d9975
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_go_version.txt
@@ -0,0 +1,110 @@
+# Test support for declaring needed Go version in module.
+
+env GO111MODULE=on
+
+go list
+go build
+go build sub.1
+go build subver.1
+! stderr 'module requires'
+! go build badsub.1
+stderr '^note: module requires Go 1.11111$'
+
+go build versioned.1
+go mod edit -require versioned.1@v1.1.0
+! go build versioned.1
+stderr '^note: module requires Go 1.99999$'
+
+[short] stop
+
+# The message should be printed even if the compiler emits no output.
+go build -o $WORK/nooutput.exe nooutput.go
+! go build -toolexec=$WORK/nooutput.exe versioned.1
+stderr '^# versioned.1\nnote: module requires Go 1.99999$'
+
+-- go.mod --
+module m
+go 1.999
+require (
+	sub.1 v1.0.0
+	subver.1 v1.0.0
+	badsub.1 v1.0.0
+	versioned.1 v1.0.0
+)
+replace (
+	sub.1 => ./sub
+	subver.1 => ./subver
+	badsub.1 => ./badsub
+	versioned.1 v1.0.0 => ./versioned1
+	versioned.1 v1.1.0 => ./versioned2
+)
+
+-- x.go --
+package x
+
+-- sub/go.mod --
+module m
+go 1.11
+
+-- sub/x.go --
+package x
+
+-- subver/go.mod --
+module m
+go 1.11111
+
+-- subver/x.go --
+package x
+
+-- badsub/go.mod --
+module m
+go 1.11111
+
+-- badsub/x.go --
+package x
+invalid syntax
+
+-- versioned1/go.mod --
+module versioned
+go 1.0
+
+-- versioned1/x.go --
+package x
+
+-- versioned2/go.mod --
+module versioned
+go 1.99999
+
+-- versioned2/x.go --
+package x
+invalid syntax
+
+-- nooutput.go --
+// +build ignore
+
+package main
+
+import (
+	"bytes"
+	"os"
+	"os/exec"
+	"strings"
+)
+
+func main() {
+	stderr := new(bytes.Buffer)
+	stdout := new(bytes.Buffer)
+
+	cmd := exec.Command(os.Args[1], os.Args[2:]...)
+	cmd.Stderr = stderr
+	cmd.Stdout = stdout
+
+	err := cmd.Run()
+	if strings.HasPrefix(os.Args[2], "-V") {
+		os.Stderr.Write(stderr.Bytes())
+		os.Stdout.Write(stdout.Bytes())
+	}
+	if err != nil {
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/go/testdata/script/mod_go_version_mixed.txt b/src/cmd/go/testdata/script/mod_go_version_mixed.txt
new file mode 100644
index 0000000..d6216ae
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_go_version_mixed.txt
@@ -0,0 +1,43 @@
+# Test that dependencies can use Go language features newer than the
+# Go version specified by the main module.
+
+env GO111MODULE=on
+
+go build
+
+-- go.mod --
+module m
+go 1.12
+require (
+	sub.1 v1.0.0
+)
+replace (
+	sub.1 => ./sub
+)
+
+-- x.go --
+package x
+
+import "sub.1"
+
+func F() { sub.F(0, 0) }
+
+var A sub.Alias
+var D sub.Defined
+
+-- sub/go.mod --
+module m
+go 1.14
+
+-- sub/sub.go --
+package sub
+
+// signed shift counts added in Go 1.13
+func F(l, r int) int { return l << r }
+
+type m1 interface { M() }
+type m2 interface { M() }
+
+// overlapping interfaces added in Go 1.14
+type Alias = interface { m1; m2; M() }
+type Defined interface { m1; m2; M() }
diff --git a/src/cmd/go/testdata/script/mod_gobuild_import.txt b/src/cmd/go/testdata/script/mod_gobuild_import.txt
new file mode 100644
index 0000000..c13ae84
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_gobuild_import.txt
@@ -0,0 +1,133 @@
+[short] skip
+
+# go/build's Import should find modules by invoking the go command
+
+go build -o $WORK ./testimport ./testfindonly
+
+# GO111MODULE=off
+env GO111MODULE=off
+! exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w .
+
+# GO111MODULE=auto in GOPATH/src
+env GO111MODULE=auto
+exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w .
+
+# GO111MODULE=auto outside GOPATH/src
+cd $GOPATH/other
+env GO111MODULE=auto
+exec $WORK/testimport$GOEXE other/x/y/z/w .
+stdout w2.go
+
+! exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w .
+stderr 'no required module provides package gobuild.example.com/x/y/z/w; to add it:\n\tgo get gobuild.example.com/x/y/z/w'
+
+cd z
+exec $WORK/testimport$GOEXE other/x/y/z/w .
+stdout w2.go
+
+# GO111MODULE=on outside GOPATH/src
+env GO111MODULE=
+exec $WORK/testimport$GOEXE other/x/y/z/w .
+stdout w2.go
+env GO111MODULE=on
+exec $WORK/testimport$GOEXE other/x/y/z/w .
+stdout w2.go
+
+# GO111MODULE=on in GOPATH/src
+cd $GOPATH/src
+env GO111MODULE=
+exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w .
+stdout w1.go
+env GO111MODULE=on
+exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w .
+stdout w1.go
+cd w
+exec $WORK/testimport$GOEXE gobuild.example.com/x/y/z/w ..
+stdout w1.go
+
+# go/build's Import in FindOnly mode should find directories by invoking the go command
+#
+# Calling build.Import in build.FindOnly mode on an import path of a Go package
+# that produces errors when loading (e.g., due to build constraints not matching
+# the current build context) should return the package directory and nil error.
+
+# Issue 31603: Import with non-empty srcDir should work.
+env GO111MODULE=on
+exec $WORK/testfindonly$GOEXE gobuild.example.com/x/y/z/i $WORK
+! stdout 'build constraints'
+stdout '^dir=\$WORK.+i err=<nil>$'
+
+# Issue 37153: Import with empty srcDir should work.
+env GO111MODULE=on
+exec $WORK/testfindonly$GOEXE gobuild.example.com/x/y/z/i ''
+! stdout 'build constraints'
+stdout '^dir=\$WORK.+i err=<nil>$'
+
+-- go.mod --
+module gobuild.example.com/x/y/z
+
+-- z.go --
+package z
+
+-- w/w1.go --
+package w
+
+-- i/i.go --
+// +build i
+
+package i
+
+-- testimport/x.go --
+package main
+
+import (
+	"fmt"
+	"go/build"
+	"log"
+	"os"
+	"path/filepath"
+	"strings"
+)
+
+func main() {
+	// build.Import should support relative and absolute source dir paths.
+	path := os.Args[1]
+	srcDir := os.Args[2]
+	p1, err := build.Import(path, srcDir, 0)
+	if err != nil {
+		log.Fatal(err)
+	}
+	absSrcDir, err := filepath.Abs(srcDir)
+	if err != nil {
+		log.Fatal(err)
+	}
+	p2, err := build.Import(path, absSrcDir, 0)
+	if err != nil {
+		log.Fatal(err)
+	}
+	if p1.Dir != p2.Dir {
+		log.Fatalf("different packages loaded with relative and absolute paths:\n\t%s\n\t%s", p1.Dir, p2.Dir)
+	}
+
+	fmt.Printf("%s\n%s\n", p1.Dir, strings.Join(p1.GoFiles, " "))
+}
+
+-- testfindonly/x.go --
+package main
+
+import (
+	"fmt"
+	"go/build"
+	"os"
+)
+
+func main() {
+	p, err := build.Import(os.Args[1], os.Args[2], build.FindOnly)
+	fmt.Printf("dir=%s err=%v\n", p.Dir, err)
+}
+
+-- $GOPATH/other/go.mod --
+module other/x/y
+
+-- $GOPATH/other/z/w/w2.go --
+package w
diff --git a/src/cmd/go/testdata/script/mod_gofmt_invalid.txt b/src/cmd/go/testdata/script/mod_gofmt_invalid.txt
new file mode 100644
index 0000000..21edc7d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_gofmt_invalid.txt
@@ -0,0 +1,13 @@
+# Test for a crash in go fmt on invalid input when using modules.
+# Issue 26792.
+
+env GO111MODULE=on
+! go fmt x.go
+! stderr panic
+
+-- go.mod --
+module x
+
+-- x.go --
+// Missing package declaration.
+var V int
diff --git a/src/cmd/go/testdata/script/mod_gomodcache.txt b/src/cmd/go/testdata/script/mod_gomodcache.txt
new file mode 100644
index 0000000..b2143e2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_gomodcache.txt
@@ -0,0 +1,60 @@
+# Test GOMODCACHE
+env GO111MODULE=on
+
+# Explicitly set GOMODCACHE
+env GOMODCACHE=$WORK/modcache
+go env GOMODCACHE
+stdout $WORK[/\\]modcache
+go get -d rsc.io/quote@v1.0.0
+exists $WORK/modcache/cache/download/rsc.io/quote/@v/v1.0.0.info
+grep '{"Version":"v1.0.0","Time":"2018-02-14T00:45:20Z"}' $WORK/modcache/cache/download/rsc.io/quote/@v/v1.0.0.info
+
+# Ensure GOMODCACHE doesn't affect location of sumdb, but $GOMODCACHE/cache/download/sumdb is still written
+exists $GOPATH/pkg/sumdb
+! exists $WORK/modcache/sumdb
+exists $WORK/modcache/cache/download/sumdb
+
+# Test that the default GOMODCACHE is $GOPATH[0]/pkg/mod
+env GOMODCACHE=
+go env GOMODCACHE
+stdout $GOPATH[/\\]pkg[/\\]mod
+go get -d rsc.io/quote@v1.0.0
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.0.0.info
+grep '{"Version":"v1.0.0","Time":"2018-02-14T00:45:20Z"}' $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.0.0.info
+
+# If neither GOMODCACHE or GOPATH are set, GOPATH defaults to the user's $HOME/go, so GOMODCACHE becomes $HOME/go/pkg/mod
+[windows] env USERPROFILE=$WORK/home # Ensure USERPROFILE is a valid path (rather than /no-home/ so we don't run into the logic that "uninfers" GOPATH in cmd/go/main.go
+[plan9] env home=$WORK/home
+[!windows] [!plan9] env HOME=$WORK/home
+env GOMODCACHE=
+env GOPATH=
+go env GOMODCACHE
+stdout $HOME[/\\]go[/\\]pkg[/\\]mod
+
+# If GOMODCACHE isn't set and GOPATH starts with the path list separator, it's an error.
+env GOMODCACHE=
+env GOPATH=${:}$WORK/this/is/ignored
+! go env GOMODCACHE
+stderr 'missing \$GOPATH'
+
+# If GOMODCACHE isn't set and GOPATH has multiple elements only the first is used.
+env GOMODCACHE=
+env GOPATH=$WORK/first/path${:}$WORK/this/is/ignored
+go env GOMODCACHE
+stdout $WORK[/\\]first[/\\]path[/\\]pkg[/\\]mod
+
+env GOMODCACHE=$WORK/modcache
+go mod download rsc.io/quote@v1.0.0
+exists $WORK/modcache/cache/download/rsc.io/quote/@v/v1.0.0.info
+
+# Test that the following work even with GO111MODULE=off
+env GO111MODULE=off
+
+# Cleaning modcache
+exists $WORK/modcache
+env GOMODCACHE=$WORK/modcache
+go clean -modcache
+! exists $WORK/modcache
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_gonoproxy.txt b/src/cmd/go/testdata/script/mod_gonoproxy.txt
new file mode 100644
index 0000000..2047869
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_gonoproxy.txt
@@ -0,0 +1,54 @@
+env GO111MODULE=on
+env sumdb=$GOSUMDB
+env proxy=$GOPROXY
+env GOPRIVATE GOPROXY GONOPROXY GOSUMDB GONOSUMDB
+env dbname=localhost.localdev/sumdb
+
+# disagree with sumdb fails
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb' '$proxy/sumdb-wrong
+! go get -d rsc.io/quote
+stderr 'SECURITY ERROR'
+
+# GONOSUMDB bypasses sumdb, for rsc.io/quote, rsc.io/sampler, golang.org/x/text
+env GONOSUMDB='*/quote,*/*mple*,golang.org/x'
+go get -d rsc.io/quote
+rm go.sum
+env GOPRIVATE='*/quote,*/*mple*,golang.org/x'
+env GONOPROXY=none # that is, proxy all despite GOPRIVATE
+go get -d rsc.io/quote
+
+# Download .info files needed for 'go list -m all' later.
+# TODO(#42723): either 'go list -m' should not read these files,
+# or 'go get' and 'go mod tidy' should download them.
+go list -m all
+stdout '^golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c$'
+
+# When GOPROXY is not empty but contains no entries, an error should be reported.
+env GOPROXY=','
+! go get -d golang.org/x/text
+stderr '^go get golang.org/x/text: GOPROXY list is not the empty string, but contains no entries$'
+
+# When GOPROXY=off, fetching modules not matched by GONOPROXY fails.
+env GONOPROXY=*/fortune
+env GOPROXY=off
+! go get -d golang.org/x/text
+stderr '^go get golang.org/x/text: module lookup disabled by GOPROXY=off$'
+
+# GONOPROXY bypasses proxy
+[!net] skip
+[!exec:git] skip
+env GOPRIVATE=none
+env GONOPROXY='*/fortune'
+! go get -d rsc.io/fortune # does not exist in real world, only on test proxy
+stderr 'git ls-remote'
+
+env GOSUMDB=
+env GONOPROXY=
+env GOPRIVATE='*/x'
+go get -d golang.org/x/text
+go list -m all
+! stdout 'text.*v0.0.0-2017' # should not have the version from the proxy
+
+-- go.mod.orig --
+module m
diff --git a/src/cmd/go/testdata/script/mod_gopkg_unstable.txt b/src/cmd/go/testdata/script/mod_gopkg_unstable.txt
new file mode 100644
index 0000000..5ad9106
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_gopkg_unstable.txt
@@ -0,0 +1,24 @@
+env GO111MODULE=on
+
+cp go.mod.empty go.mod
+go get -d gopkg.in/dummy.v2-unstable
+
+cp x.go.txt x.go
+cp go.mod.empty go.mod
+go list
+
+[!net] skip
+[!exec:git] skip
+
+env GOPROXY=direct
+env GOSUMDB=off
+go get -d gopkg.in/macaroon-bakery.v2-unstable/bakery
+go list -m all
+stdout 'gopkg.in/macaroon-bakery.v2-unstable v2.0.0-[0-9]+-[0-9a-f]+$'
+
+-- go.mod.empty --
+module m
+
+-- x.go.txt --
+package x
+import _ "gopkg.in/dummy.v2-unstable"
diff --git a/src/cmd/go/testdata/script/mod_goroot_errors.txt b/src/cmd/go/testdata/script/mod_goroot_errors.txt
new file mode 100644
index 0000000..9d7a94d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_goroot_errors.txt
@@ -0,0 +1,53 @@
+env GO111MODULE=on
+
+# Regression test for https://golang.org/issue/34769.
+# Missing standard-library imports should refer to GOROOT rather than
+# complaining about a malformed module path.
+# This is especially important when GOROOT is set incorrectly,
+# since such an error will occur for every package in std.
+
+# Building a nonexistent std package directly should fail usefully.
+
+! go build -mod=readonly nonexist
+! stderr 'import lookup disabled'
+! stderr 'missing dot'
+stderr '^package nonexist is not in GOROOT \('$GOROOT'[/\\]src[/\\]nonexist\)$'
+
+! go build nonexist
+! stderr 'import lookup disabled'
+! stderr 'missing dot'
+stderr '^package nonexist is not in GOROOT \('$GOROOT'[/\\]src[/\\]nonexist\)$'
+
+# Building a nonexistent std package indirectly should also fail usefully.
+
+! go build -mod=readonly ./importnonexist
+! stderr 'import lookup disabled'
+! stderr 'missing dot'
+stderr '^importnonexist[/\\]x.go:2:8: package nonexist is not in GOROOT \('$GOROOT'[/\\]src[/\\]nonexist\)$'
+
+! go build ./importnonexist
+! stderr 'import lookup disabled'
+! stderr 'missing dot'
+stderr '^importnonexist[/\\]x.go:2:8: package nonexist is not in GOROOT \('$GOROOT'[/\\]src[/\\]nonexist\)$'
+
+# Building an *actual* std package should fail if GOROOT is set to something bogus.
+
+[!short] go build ./importjson  # Prove that it works when GOROOT is valid.
+
+env GOROOT=$WORK/not-a-valid-goroot
+! go build ./importjson
+! stderr 'import lookup disabled'
+! stderr 'missing dot'
+stderr 'importjson[/\\]x.go:2:8: package encoding/json is not in GOROOT \('$WORK'[/\\]not-a-valid-goroot[/\\]src[/\\]encoding[/\\]json\)$'
+
+-- go.mod --
+module example.com
+go 1.14
+-- importnonexist/x.go --
+package importnonexist
+import _ "nonexist"
+-- importjson/x.go --
+package importjson
+import _ "encoding/json"
+-- $WORK/not-a-valid-goroot/README --
+This directory is not a valid GOROOT.
diff --git a/src/cmd/go/testdata/script/mod_graph.txt b/src/cmd/go/testdata/script/mod_graph.txt
new file mode 100644
index 0000000..07968f5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_graph.txt
@@ -0,0 +1,10 @@
+env GO111MODULE=on
+
+go mod graph
+stdout '^m rsc.io/quote@v1.5.2$'
+stdout '^rsc.io/quote@v1.5.2 rsc.io/sampler@v1.3.0$'
+! stdout '^m rsc.io/sampler@v1.3.0$'
+
+-- go.mod --
+module m
+require rsc.io/quote v1.5.2
diff --git a/src/cmd/go/testdata/script/mod_help.txt b/src/cmd/go/testdata/script/mod_help.txt
new file mode 100644
index 0000000..b5cd30c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_help.txt
@@ -0,0 +1,6 @@
+env GO111MODULE=on
+
+# go help get shows usage for get
+go help get
+stdout 'usage: go get'
+stdout 'get using modules to manage source'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/mod_import.txt b/src/cmd/go/testdata/script/mod_import.txt
new file mode 100644
index 0000000..28358b5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+# latest rsc.io/quote should be v1.5.2 not v1.5.3-pre1
+go get -d
+go list -m all
+stdout 'rsc.io/quote v1.5.2'
+
+# but v1.5.3-pre1 should be a known version
+go list -m -versions rsc.io/quote
+stdout '^rsc.io/quote v1.0.0 v1.1.0 v1.2.0 v1.2.1 v1.3.0 v1.4.0 v1.5.0 v1.5.1 v1.5.2 v1.5.3-pre1$'
+
+-- go.mod --
+module x
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
+
diff --git a/src/cmd/go/testdata/script/mod_import_cycle.txt b/src/cmd/go/testdata/script/mod_import_cycle.txt
new file mode 100644
index 0000000..7be0749
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_cycle.txt
@@ -0,0 +1,40 @@
+env GO111MODULE=on
+
+# 'go list all' should fail with a reasonable error message
+! go list all
+stderr '^package m\n\timports m/a\n\timports m/b\n\timports m/a: import cycle not allowed'
+
+# 'go list -e' should not print to stderr, but should mark all three
+# packages (m, m/a, and m/b) as Incomplete.
+go list -e -json all
+! stderr .
+stdout -count=3 '"Incomplete": true,'
+
+-- go.mod --
+module m
+
+require (
+	m/a v0.0.0
+	m/b v0.0.0
+)
+
+replace (
+	m/a => ./a
+	m/b => ./b
+)
+-- m.go --
+package m
+import (
+	_ "m/a"
+	_ "m/b"
+)
+-- a/go.mod --
+module m/a
+-- a/a.go --
+package a
+import _ "m/b"
+-- b/go.mod --
+module m/b
+-- b/b.go --
+package b
+import _ "m/a"
diff --git a/src/cmd/go/testdata/script/mod_import_issue41113.txt b/src/cmd/go/testdata/script/mod_import_issue41113.txt
new file mode 100644
index 0000000..fed2510
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_issue41113.txt
@@ -0,0 +1,28 @@
+# Regression test for https://golang.org/issue/41113.
+#
+# When resolving a missing import path, the inability to add the package from
+# one module path should not interfere with adding a nested path.
+
+# Initially, our module depends on split-incompatible v2.1.0-pre+incompatible,
+# from which an imported package has been removed (and relocated to the nested
+# split-incompatible/subpkg module). modload.QueryPattern will suggest
+# split-incompatible v2.0.0+incompatible, which we cannot use (because it would
+# be an implicit downgrade), and split-incompatible/subpkg v0.1.0, which we
+# *should* use.
+
+go mod tidy
+
+go list -m all
+stdout '^example.com/split-incompatible/subpkg v0\.1\.0$'
+! stdout '^example.com/split-incompatible .*'
+
+-- go.mod --
+module golang.org/issue/41113
+
+go 1.16
+
+require example.com/split-incompatible v2.1.0-pre+incompatible
+-- x.go --
+package issue41113
+
+import _ "example.com/split-incompatible/subpkg"
diff --git a/src/cmd/go/testdata/script/mod_import_issue42891.txt b/src/cmd/go/testdata/script/mod_import_issue42891.txt
new file mode 100644
index 0000000..a78cab2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_issue42891.txt
@@ -0,0 +1,14 @@
+# If an import declaration is an absolute path, most commands should report
+# an error instead of going into an infinite loop.
+# Verifies golang.org/issue/42891.
+go list .
+stdout '^m$'
+
+-- go.mod --
+module m
+
+go 1.16
+-- m.go --
+package m
+
+import "/"
diff --git a/src/cmd/go/testdata/script/mod_import_meta.txt b/src/cmd/go/testdata/script/mod_import_meta.txt
new file mode 100644
index 0000000..0e469d0
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_meta.txt
@@ -0,0 +1,45 @@
+# The loader should not attempt to resolve imports of the "all", "std", and "cmd" meta-packages.
+
+! go list -deps ./importall
+! stderr 'internal error'
+stderr '^importall[/\\]x.go:3:8: "all" is not an importable package; see ''go help packages''$'
+
+! go list -deps ./importcmd
+! stderr 'internal error'
+stderr '^importcmd[/\\]x.go:3:8: "cmd" is not an importable package; see ''go help packages''$'
+
+! go list -deps ./importstd
+! stderr 'internal error'
+stderr '^importstd[/\\]x.go:3:8: "std" is not an importable package; see ''go help packages''$'
+
+
+# Not even if such a path is theoretically provided by a (necessarily replaced) module.
+
+go mod edit -replace std@v0.1.0=./modstd
+go mod edit -require std@v0.1.0
+
+! go list -deps ./importstd
+stderr '^importstd[/\\]x.go:3:8: "std" is not an importable package; see ''go help packages''$'
+
+
+-- go.mod --
+module example.com
+go 1.16
+-- importall/x.go --
+package importall
+
+import _ "all"
+-- importcmd/x.go --
+package importcmd
+
+import _ "cmd"
+-- importstd/x.go --
+package importstd
+
+import _ "std"
+-- modstd/go.mod --
+module std
+go 1.16
+-- modstd/std.go --
+// Package std is an incredibly confusingly-named package.
+package std
diff --git a/src/cmd/go/testdata/script/mod_import_mod.txt b/src/cmd/go/testdata/script/mod_import_mod.txt
new file mode 100644
index 0000000..b035e3d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_mod.txt
@@ -0,0 +1,7 @@
+# Test that GOPATH/pkg/mod is excluded
+env GO111MODULE=off
+! go list mod/foo
+stderr 'disallowed import path'
+
+-- mod/foo/foo.go --
+package foo
diff --git a/src/cmd/go/testdata/script/mod_import_v1suffix.txt b/src/cmd/go/testdata/script/mod_import_v1suffix.txt
new file mode 100644
index 0000000..a429450
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_import_v1suffix.txt
@@ -0,0 +1,11 @@
+env GO111MODULE=on
+
+! go get -d example.com/invalidpath/v1
+! go install .
+
+-- go.mod --
+module example.com
+-- main.go --
+package main
+import _ "example.com/invalidpath/v1"
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_in_testdata_dir.txt b/src/cmd/go/testdata/script/mod_in_testdata_dir.txt
new file mode 100644
index 0000000..66f79fa
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_in_testdata_dir.txt
@@ -0,0 +1,45 @@
+# Regression test for golang.org/issue/28481:
+# 'mod tidy' removed dependencies if the module root was
+# within a directory named 'testdata' or '_foo'.
+
+env GO111MODULE=on
+
+# A module should be allowed in a directory named testdata.
+cd $WORK/testdata
+go mod init testdata.tld/foo
+
+# Getting a package within that module should resolve its dependencies.
+go get -d
+grep 'rsc.io/quote' go.mod
+
+# Tidying the module should preserve those dependencies.
+go mod tidy
+grep 'rsc.io/quote' go.mod
+
+[short] stop
+
+# Vendoring the module's dependencies should work too.
+go mod vendor
+exists vendor/rsc.io/quote
+
+# The same should work in directories with names starting with underscores.
+cd $WORK/_ignored
+go mod init testdata.tld/foo
+
+go get
+grep 'rsc.io/quote' go.mod
+
+go mod tidy
+grep 'rsc.io/quote' go.mod
+
+go mod vendor
+exists vendor/rsc.io/quote
+
+-- $WORK/testdata/main.go --
+package foo
+
+import _ "rsc.io/quote"
+-- $WORK/_ignored/main.go --
+package foo
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_indirect.txt b/src/cmd/go/testdata/script/mod_indirect.txt
new file mode 100644
index 0000000..6ea1cae
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_indirect.txt
@@ -0,0 +1,81 @@
+env GO111MODULE=on
+
+# golang.org/issue/31248: required modules imposed by dependency versions
+# older than the selected version must still be taken into account.
+
+env GOFLAGS=-mod=readonly
+
+# Indirect dependencies required via older-than-selected versions must exist in
+# the module graph, but do not need to be listed explicitly in the go.mod file
+# (since they are implied).
+go mod graph
+stdout i@v0.1.0
+
+# The modules must also appear in the build list, not just the graph.
+go list -m all
+stdout '^i v0.1.0'
+
+# The packages provided by those dependencies must resolve.
+go list all
+stdout '^i$'
+
+-- go.mod --
+module main
+
+go 1.13
+
+require (
+	a v0.0.0
+	b v0.0.0
+	c v0.0.0
+)
+
+// Apply replacements so that the test can be self-contained.
+// (It's easier to see all of the modules here than to go
+// rooting around in testdata/mod.)
+replace (
+	a => ./a
+	b => ./b
+	c => ./c
+	x v0.1.0 => ./x1
+	x v0.2.0 => ./x2
+	i => ./i
+)
+-- main.go --
+package main
+
+import (
+	_ "a"
+	_ "b"
+	_ "c"
+)
+
+func main() {}
+-- a/go.mod --
+module a
+go 1.13
+require x v0.1.0
+-- a/a.go --
+package a
+-- b/go.mod --
+module b
+go 1.13
+require x v0.2.0
+-- b/b.go --
+package b
+-- c/go.mod --
+module c
+go 1.13
+-- c/c.go --
+package c
+import _ "i"
+-- x1/go.mod --
+module x
+go1.13
+require i v0.1.0
+-- x2/go.mod --
+module x
+go1.13
+-- i/go.mod --
+-- i/i.go --
+package i
diff --git a/src/cmd/go/testdata/script/mod_indirect_main.txt b/src/cmd/go/testdata/script/mod_indirect_main.txt
new file mode 100644
index 0000000..eeb93f1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_indirect_main.txt
@@ -0,0 +1,65 @@
+env GO111MODULE=on
+
+# Regression test for golang.org/issue/29773: 'go list -m' was not following
+# dependencies through older versions of the main module.
+
+go list -f '{{with .Module}}{{.Path}}{{with .Version}} {{.}}{{end}}{{end}}' all
+cmp stdout pkgmods.txt
+
+go list -m all
+cmp stdout mods.txt
+
+go mod graph
+cmp stdout graph.txt
+
+-- go.mod --
+module golang.org/issue/root
+
+go 1.12
+
+replace (
+	golang.org/issue/mirror v0.1.0 => ./mirror-v0.1.0
+	golang.org/issue/pkg v0.1.0 => ./pkg-v0.1.0
+	golang.org/issue/root v0.1.0 => ./root-v0.1.0
+)
+
+require golang.org/issue/mirror v0.1.0
+
+-- root.go --
+package root
+
+import _ "golang.org/issue/mirror"
+
+-- mirror-v0.1.0/go.mod --
+module golang.org/issue/mirror
+
+require golang.org/issue/root v0.1.0
+
+-- mirror-v0.1.0/mirror.go --
+package mirror
+
+import _ "golang.org/issue/pkg"
+
+-- pkg-v0.1.0/go.mod --
+module golang.org/issue/pkg
+
+-- pkg-v0.1.0/pkg.go --
+package pkg
+
+-- root-v0.1.0/go.mod --
+module golang.org/issue/root
+
+require golang.org/issue/pkg v0.1.0
+
+-- pkgmods.txt --
+golang.org/issue/mirror v0.1.0
+golang.org/issue/pkg v0.1.0
+golang.org/issue/root
+-- mods.txt --
+golang.org/issue/root
+golang.org/issue/mirror v0.1.0 => ./mirror-v0.1.0
+golang.org/issue/pkg v0.1.0 => ./pkg-v0.1.0
+-- graph.txt --
+golang.org/issue/root golang.org/issue/mirror@v0.1.0
+golang.org/issue/mirror@v0.1.0 golang.org/issue/root@v0.1.0
+golang.org/issue/root@v0.1.0 golang.org/issue/pkg@v0.1.0
diff --git a/src/cmd/go/testdata/script/mod_indirect_tidy.txt b/src/cmd/go/testdata/script/mod_indirect_tidy.txt
new file mode 100644
index 0000000..a12b35c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_indirect_tidy.txt
@@ -0,0 +1,60 @@
+env GO111MODULE=on
+
+# golang.org/issue/31248: loading the build list must not add explicit entries
+# for indirect dependencies already implied by older-than-selected versions
+# already in the build list.
+
+cp go.mod.orig go.mod
+go mod tidy
+cmp go.mod go.mod.orig
+
+cp go.mod.orig go.mod
+go list -m all
+cmp go.mod go.mod.orig
+
+-- go.mod.orig --
+module main
+
+go 1.13
+
+require a v0.0.0
+
+replace (
+	a v0.0.0 => ./a
+	b v0.0.0 => ./b
+	i v0.0.0 => ./i
+	x v0.1.0 => ./x1
+	x v0.2.0 => ./x2
+)
+-- main.go --
+package main
+
+import _ "a"
+
+func main() {}
+-- a/go.mod --
+module a
+go 1.13
+require (
+	x v0.2.0
+	b v0.0.0
+)
+-- a/a.go --
+package a
+-- b/go.mod --
+module b
+go 1.13
+require x v0.1.0
+-- x1/go.mod --
+module x
+go 1.13
+require (
+	b v0.0.0
+	i v0.0.0
+)
+-- x2/go.mod --
+module x
+go 1.13
+-- i/go.mod --
+module i
+go 1.13
diff --git a/src/cmd/go/testdata/script/mod_init_dep.txt b/src/cmd/go/testdata/script/mod_init_dep.txt
new file mode 100644
index 0000000..f8cf1d5
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_init_dep.txt
@@ -0,0 +1,44 @@
+env GO111MODULE=on
+env GOFLAGS=-mod=mod
+
+# modconv uses git directly to examine what old 'go get' would
+[!net] skip
+[!exec:git] skip
+
+# go mod init should populate go.mod from Gopkg.lock
+go mod init x
+stderr 'copying requirements from Gopkg.lock'
+go list -m all
+stdout 'rsc.io/sampler v1.0.0'
+
+# test dep replacement
+cd y
+go mod init
+cmpenv go.mod go.mod.replace
+
+-- x.go --
+package x
+
+-- Gopkg.lock --
+[[projects]]
+  name = "rsc.io/sampler"
+  version = "v1.0.0"
+
+-- y/Gopkg.lock --
+[[projects]]
+  name = "z"
+  revision = "v1.0.0"
+  source = "rsc.io/quote"
+
+-- y/y.go --
+package y // import "y"
+import _ "z"
+
+-- y/go.mod.replace --
+module y
+
+go $goversion
+
+replace z v1.0.0 => rsc.io/quote v1.0.0
+
+require rsc.io/quote v1.0.0
diff --git a/src/cmd/go/testdata/script/mod_init_empty.txt b/src/cmd/go/testdata/script/mod_init_empty.txt
new file mode 100644
index 0000000..1c3888c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_init_empty.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=on
+
+env GOPATH=$devnull
+
+go list -m
+stdout '^example.com$'
+
+go list
+stdout '^example.com$'
+
+-- go.mod --
+module example.com
+
+go 1.13
+-- main.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_init_glide.txt b/src/cmd/go/testdata/script/mod_init_glide.txt
new file mode 100644
index 0000000..a351a6a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_init_glide.txt
@@ -0,0 +1,34 @@
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+
+# Regression test for golang.org/issue/32161:
+# 'go mod init' did not locate tags when resolving a commit to a pseudo-version.
+go mod init x
+cmpenv go.mod go.mod.out
+
+-- main.go --
+package main
+
+import (
+	_ "github.com/rsc/legacytest"
+)
+
+func main() {}
+
+-- glide.lock --
+imports:
+- name: github.com/rsc/legacytest
+  version: fb3c628075e32f7f3c248a3abbdafd69ad6e21e1
+
+-- glide.yaml --
+package: x
+
+-- go.mod.out --
+module x
+
+go $goversion
+
+require github.com/rsc/legacytest v1.1.0-pre.0.20180717164849-fb3c628075e3
diff --git a/src/cmd/go/testdata/script/mod_init_path.txt b/src/cmd/go/testdata/script/mod_init_path.txt
new file mode 100644
index 0000000..ccdfc92
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_init_path.txt
@@ -0,0 +1,20 @@
+env GO111MODULE=on
+
+! go mod init .
+stderr '^go: invalid module path "\.": is a local import path$'
+
+cd x
+go mod init example.com/x
+
+cd ../y
+go mod init m
+
+-- x/main.go --
+package main
+
+func main() {}
+
+-- y/main.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_init_tidy.txt b/src/cmd/go/testdata/script/mod_init_tidy.txt
new file mode 100644
index 0000000..4a52590
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_init_tidy.txt
@@ -0,0 +1,30 @@
+# 'go mod init' should not recommend 'go mod tidy' in an empty directory
+# (one that contains no non-hidden .go files or subdirectories).
+cd empty
+go mod init m
+! stderr tidy
+cd ..
+
+# 'go mod init' should recommend 'go mod tidy' if the directory has a .go file.
+cd pkginroot
+go mod init m
+stderr '^go: to add module requirements and sums:\n\tgo mod tidy$'
+cd ..
+
+# 'go mod init' should recommend 'go mod tidy' if the directory has a
+# subdirectory. We don't walk the tree to see if it has .go files.
+cd subdir
+go mod init m
+stderr '^go: to add module requirements and sums:\n\tgo mod tidy$'
+cd ..
+
+-- empty/empty.txt --
+Not a .go file. Still counts as an empty project.
+-- empty/.hidden/empty.go --
+File in hidden directory. Still as an empty project.
+-- empty/_hidden/empty.go --
+File in hidden directory. Still as an empty project.
+-- pkginroot/hello.go --
+package vendorimport
+-- subdir/sub/empty.txt --
+Subdirectory doesn't need to contain a package.
diff --git a/src/cmd/go/testdata/script/mod_install_hint.txt b/src/cmd/go/testdata/script/mod_install_hint.txt
new file mode 100644
index 0000000..ab02840
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_install_hint.txt
@@ -0,0 +1,5 @@
+# Module is replaced but not required. No hint appears as no module is suggested.

+go mod init m

+go mod edit -replace=github.com/notrequired@v0.5.0=github.com/doesnotexist@v0.5.0

+! go install github.com/notrequired

+! stderr 'to add it:'
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/mod_install_pkg_version.txt b/src/cmd/go/testdata/script/mod_install_pkg_version.txt
new file mode 100644
index 0000000..6ed600f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_install_pkg_version.txt
@@ -0,0 +1,203 @@
+# 'go install pkg@version' works outside a module.
+env GO111MODULE=auto
+go install example.com/cmd/a@v1.0.0
+exists $GOPATH/bin/a$GOEXE
+rm $GOPATH/bin
+
+
+# 'go install pkg@version' reports an error if modules are disabled.
+env GO111MODULE=off
+! go install example.com/cmd/a@v1.0.0
+stderr '^go: modules disabled by GO111MODULE=off; see ''go help modules''$'
+env GO111MODULE=auto
+
+
+# 'go install pkg@version' ignores go.mod in current directory.
+cd m
+cp go.mod go.mod.orig
+! go list -m all
+stderr '^go: example.com/cmd@v1.1.0-doesnotexist: missing go.sum entry; to add it:\n\tgo mod download example.com/cmd$'
+go install example.com/cmd/a@latest
+cmp go.mod go.mod.orig
+exists $GOPATH/bin/a$GOEXE
+go version -m $GOPATH/bin/a$GOEXE
+stdout '^\tmod\texample.com/cmd\tv1.0.0\t' # "latest", not from go.mod
+rm $GOPATH/bin/a
+cd ..
+
+
+# 'go install -modfile=x.mod pkg@version' reports an error, but only if
+# -modfile is specified explicitly on the command line.
+cd m
+env GOFLAGS=-modfile=go.mod
+go install example.com/cmd/a@latest  # same as above
+env GOFLAGS=
+! go install -modfile=go.mod example.com/cmd/a@latest
+stderr '^go: -modfile cannot be used with commands that ignore the current module$'
+cd ..
+
+
+# Every test case requires linking, so we only cover the most important cases
+# when -short is set.
+[short] stop
+
+
+# 'go install pkg@version' works on a module that doesn't have a go.mod file
+# and with a module whose go.mod file has missing requirements.
+# With a proxy, the two cases are indistinguishable.
+go install rsc.io/fortune@v1.0.0
+stderr '^go: found rsc.io/quote in rsc.io/quote v1.5.2$'
+exists $GOPATH/bin/fortune$GOEXE
+! exists $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0/go.mod # no go.mod file
+go version -m $GOPATH/bin/fortune$GOEXE
+stdout '^\tdep\trsc.io/quote\tv1.5.2\t' # latest version of fortune's dependency
+rm $GOPATH/bin
+
+
+# 'go install dir@version' works like a normal 'go install' command if
+# dir is a relative or absolute path.
+env GO111MODULE=on
+go mod download rsc.io/fortune@v1.0.0
+! go install $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0
+stderr '^go: go\.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go install ../pkg/mod/rsc.io/fortune@v1.0.0
+stderr '^go: go\.mod file not found in current directory or any parent directory; see ''go help modules''$'
+mkdir tmp
+cd tmp
+go mod init tmp
+go mod edit -require=rsc.io/fortune@v1.0.0
+! go install -mod=readonly $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0
+stderr '^go: rsc.io/fortune@v1.0.0: missing go.sum entry; to add it:\n\tgo mod download rsc.io/fortune$'
+! go install -mod=readonly ../../pkg/mod/rsc.io/fortune@v1.0.0
+stderr '^go: rsc.io/fortune@v1.0.0: missing go.sum entry; to add it:\n\tgo mod download rsc.io/fortune$'
+go get -d rsc.io/fortune@v1.0.0
+go install -mod=readonly $GOPATH/pkg/mod/rsc.io/fortune@v1.0.0
+exists $GOPATH/bin/fortune$GOEXE
+cd ..
+rm tmp
+rm $GOPATH/bin
+env GO111MODULE=auto
+
+# 'go install pkg@version' reports errors for meta packages, std packages,
+# and directories.
+! go install std@v1.0.0
+stderr '^go install std@v1.0.0: argument must be a package path, not a meta-package$'
+! go install fmt@v1.0.0
+stderr '^go install fmt@v1.0.0: argument must not be a package in the standard library$'
+! go install example.com//cmd/a@v1.0.0
+stderr '^go install example.com//cmd/a@v1.0.0: argument must be a clean package path$'
+! go install example.com/cmd/a@v1.0.0 ./x@v1.0.0
+stderr '^go install ./x@v1.0.0: argument must be a package path, not a relative path$'
+! go install example.com/cmd/a@v1.0.0 $GOPATH/src/x@v1.0.0
+stderr '^go install '$WORK'[/\\]gopath/src/x@v1.0.0: argument must be a package path, not an absolute path$'
+! go install example.com/cmd/a@v1.0.0 cmd/...@v1.0.0
+stderr '^go install: package cmd/go not provided by module example.com/cmd@v1.0.0$'
+
+# 'go install pkg@version' should accept multiple arguments but report an error
+# if the version suffixes are different, even if they refer to the same version.
+go install example.com/cmd/a@v1.0.0 example.com/cmd/b@v1.0.0
+exists $GOPATH/bin/a$GOEXE
+exists $GOPATH/bin/b$GOEXE
+rm $GOPATH/bin
+
+env GO111MODULE=on
+go list -m example.com/cmd@latest
+stdout '^example.com/cmd v1.0.0$'
+env GO111MODULE=auto
+
+! go install example.com/cmd/a@v1.0.0 example.com/cmd/b@latest
+stderr '^go install example.com/cmd/b@latest: all arguments must have the same version \(@v1.0.0\)$'
+
+
+# 'go install pkg@version' should report an error if the arguments are in
+# different modules.
+! go install example.com/cmd/a@v1.0.0 rsc.io/fortune@v1.0.0
+stderr '^go install: package rsc.io/fortune provided by module rsc.io/fortune@v1.0.0\n\tAll packages must be provided by the same module \(example.com/cmd@v1.0.0\).$'
+
+
+# 'go install pkg@version' should report an error if an argument is not
+# a main package.
+! go install example.com/cmd/a@v1.0.0 example.com/cmd/err@v1.0.0
+stderr '^go install: package example.com/cmd/err is not a main package$'
+
+# Wildcards should match only main packages. This module has a non-main package
+# with an error, so we'll know if that gets built.
+mkdir tmp
+cd tmp
+go mod init m
+go get -d example.com/cmd@v1.0.0
+! go build example.com/cmd/...
+stderr 'err[/\\]err.go:3:9: undefined: DoesNotCompile$'
+cd ..
+
+go install example.com/cmd/...@v1.0.0
+exists $GOPATH/bin/a$GOEXE
+exists $GOPATH/bin/b$GOEXE
+rm $GOPATH/bin
+
+# If a wildcard matches no packages, we should see a warning.
+! go install example.com/cmd/nomatch...@v1.0.0
+stderr '^go install example.com/cmd/nomatch\.\.\.@v1.0.0: module example.com/cmd@v1.0.0 found, but does not contain packages matching example.com/cmd/nomatch\.\.\.$'
+go install example.com/cmd/a@v1.0.0 example.com/cmd/nomatch...@v1.0.0
+stderr '^go: warning: "example.com/cmd/nomatch\.\.\." matched no packages$'
+
+# If a wildcard matches only non-main packges, we should see a different warning.
+go install example.com/cmd/err...@v1.0.0
+stderr '^go: warning: "example.com/cmd/err\.\.\." matched no main packages$'
+
+
+# 'go install pkg@version' should report errors if the module contains
+# replace or exclude directives.
+go mod download example.com/cmd@v1.0.0-replace
+! go install example.com/cmd/a@v1.0.0-replace
+cmp stderr replace-err
+
+go mod download example.com/cmd@v1.0.0-exclude
+! go install example.com/cmd/a@v1.0.0-exclude
+cmp stderr exclude-err
+
+# 'go install pkg@version' should report an error if the module requires a
+# higher version of itself.
+! go install example.com/cmd/a@v1.0.0-newerself
+stderr '^go install example.com/cmd/a@v1.0.0-newerself: version constraints conflict:\n\texample.com/cmd@v1.0.0-newerself requires example.com/cmd@v1.0.0, but example.com/cmd@v1.0.0-newerself is requested$'
+
+
+# 'go install pkg@version' will only match a retracted version if it's
+# explicitly requested.
+env GO111MODULE=on
+go list -m -versions example.com/cmd
+! stdout v1.9.0
+go list -m -versions -retracted example.com/cmd
+stdout v1.9.0
+go install example.com/cmd/a@latest
+go version -m $GOPATH/bin/a$GOEXE
+stdout '^\tmod\texample.com/cmd\tv1.0.0\t'
+go install example.com/cmd/a@v1.9.0
+go version -m $GOPATH/bin/a$GOEXE
+stdout '^\tmod\texample.com/cmd\tv1.9.0\t'
+env GO111MODULE=
+
+# 'go install pkg@version' succeeds when -mod=readonly is set explicitly.
+# Verifies #43278.
+go install -mod=readonly example.com/cmd/a@v1.0.0
+
+-- m/go.mod --
+module m
+
+go 1.16
+
+require example.com/cmd v1.1.0-doesnotexist
+-- x/x.go --
+package main
+
+func main() {}
+-- replace-err --
+go install example.com/cmd/a@v1.0.0-replace: example.com/cmd@v1.0.0-replace
+	The go.mod file for the module providing named packages contains one or
+	more replace directives. It must not contain directives that would cause
+	it to be interpreted differently than if it were the main module.
+-- exclude-err --
+go install example.com/cmd/a@v1.0.0-exclude: example.com/cmd@v1.0.0-exclude
+	The go.mod file for the module providing named packages contains one or
+	more exclude directives. It must not contain directives that would cause
+	it to be interpreted differently than if it were the main module.
diff --git a/src/cmd/go/testdata/script/mod_install_versioned.txt b/src/cmd/go/testdata/script/mod_install_versioned.txt
new file mode 100644
index 0000000..c6bce41
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_install_versioned.txt
@@ -0,0 +1,14 @@
+env GO111MODULE=on
+
+go get -d rsc.io/fortune
+go list -f '{{.Target}}' rsc.io/fortune
+! stdout fortune@v1
+stdout 'fortune(\.exe)?$'
+
+go get -d rsc.io/fortune/v2
+go list -f '{{.Target}}' rsc.io/fortune/v2
+! stdout v2
+stdout 'fortune(\.exe)?$'
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_internal.txt b/src/cmd/go/testdata/script/mod_internal.txt
new file mode 100644
index 0000000..687269d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_internal.txt
@@ -0,0 +1,96 @@
+env GO111MODULE=on
+[short] skip
+
+# golang.org/x/internal should be importable from other golang.org/x modules.
+go mod edit -module=golang.org/x/anything
+go get -d .
+
+# ...and their tests...
+go test
+stdout PASS
+
+# ...but that should not leak into other modules.
+go get -d ./baddep
+! go build ./baddep
+stderr golang.org[/\\]notx[/\\]useinternal
+stderr 'use of internal package golang.org/x/.* not allowed'
+
+# Internal packages in the standard library should not leak into modules.
+go get -d ./fromstd
+! go build ./fromstd
+stderr 'use of internal package internal/testenv not allowed'
+
+# Dependencies should be able to use their own internal modules...
+go mod edit -module=golang.org/notx
+go get -d ./throughdep
+
+# ... but other modules should not, even if they have transitive dependencies.
+go get -d .
+! go build .
+stderr 'use of internal package golang.org/x/.* not allowed'
+
+# And transitive dependencies still should not leak.
+go get -d ./baddep
+! go build ./baddep
+stderr golang.org[/\\]notx[/\\]useinternal
+stderr 'use of internal package golang.org/x/.* not allowed'
+
+# Replacing an internal module should keep it internal to the same paths.
+go mod edit -module=golang.org/notx
+go mod edit -replace golang.org/x/internal=./replace/golang.org/notx/internal
+go get -d ./throughdep
+
+go get -d ./baddep
+! go build ./baddep
+stderr golang.org[/\\]notx[/\\]useinternal
+stderr 'use of internal package golang.org/x/.* not allowed'
+
+go mod edit -replace golang.org/x/internal=./vendor/golang.org/x/internal
+go get -d ./throughdep
+
+go get -d ./baddep
+! go build ./baddep
+stderr golang.org[/\\]notx[/\\]useinternal
+stderr 'use of internal package golang.org/x/.* not allowed'
+
+-- go.mod --
+module TBD
+go 1.12
+-- useinternal.go --
+package useinternal
+import _ "golang.org/x/internal/subtle"
+
+-- useinternal_test.go --
+package useinternal_test
+import (
+	"testing"
+	_ "golang.org/x/internal/subtle"
+)
+
+func Test(*testing.T) {}
+
+-- throughdep/useinternal.go --
+package throughdep
+import _ "golang.org/x/useinternal"
+
+-- baddep/useinternal.go --
+package baddep
+import _ "golang.org/notx/useinternal"
+
+-- fromstd/useinternal.go --
+package fromstd
+import _ "internal/testenv"
+
+-- replace/golang.org/notx/internal/go.mod --
+module golang.org/x/internal
+
+-- replace/golang.org/notx/internal/subtle/subtle.go --
+package subtle
+// Ha ha! Nothing here!
+
+-- vendor/golang.org/x/internal/go.mod --
+module golang.org/x/internal
+
+-- vendor/golang.org/x/internal/subtle/subtle.go --
+package subtle
+// Ha ha! Nothing here!
diff --git a/src/cmd/go/testdata/script/mod_invalid_path.txt b/src/cmd/go/testdata/script/mod_invalid_path.txt
new file mode 100644
index 0000000..c8c075d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_invalid_path.txt
@@ -0,0 +1,64 @@
+# Test that mod files with invalid or missing paths produce an error.
+
+# Test that go list fails on a go.mod with no module declaration.
+cd $WORK/gopath/src/mod
+! go list .
+stderr '^go: no module declaration in go.mod. To specify the module path:\n\tgo mod edit -module=example.com/mod$'
+
+# Test that go mod init in GOPATH doesn't add a module declaration
+# with a path that can't possibly be a module path, because
+# it isn't even a valid import path.
+# The single quote and backtick are the only characters  we don't allow
+# in checkModulePathLax, but is allowed in a Windows file name.
+# TODO(matloob): choose a different character once
+# module.CheckImportPath is laxened and replaces
+# checkModulePathLax.
+cd $WORK/'gopath/src/m''d'
+! go mod init
+stderr 'cannot determine module path'
+
+# Test that a go.mod file is rejected when its module declaration has a path that can't
+# possibly be a module path, because it isn't even a valid import path
+cd $WORK/gopath/src/badname
+! go list .
+stderr 'invalid module path'
+
+# Test that an import path containing an element with a leading dot is valid,
+# but such a module path is not.
+# Verifies #43985.
+cd $WORK/gopath/src/dotname
+go list ./.dot
+stdout '^example.com/dotname/.dot$'
+go list ./use
+stdout '^example.com/dotname/use$'
+! go list -m example.com/dotname/.dot@latest
+stderr '^go list -m: example.com/dotname/.dot@latest: malformed module path "example.com/dotname/.dot": leading dot in path element$'
+go get -d example.com/dotname/.dot
+go get -d example.com/dotname/use
+go mod tidy
+
+-- mod/go.mod --
+
+-- mod/foo.go --
+package foo
+
+-- m'd/foo.go --
+package mad
+
+-- badname/go.mod --
+
+module .\.
+
+-- badname/foo.go --
+package badname
+
+-- dotname/go.mod --
+module example.com/dotname
+
+go 1.16
+-- dotname/.dot/dot.go --
+package dot
+-- dotname/use/use.go --
+package use
+
+import _ "example.com/dotname/.dot"
diff --git a/src/cmd/go/testdata/script/mod_invalid_path_plus.txt b/src/cmd/go/testdata/script/mod_invalid_path_plus.txt
new file mode 100644
index 0000000..2f2488f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_invalid_path_plus.txt
@@ -0,0 +1,32 @@
+# https://golang.org/issue/44776
+# The '+' character should be disallowed in module paths, but allowed in package
+# paths within valid modules.
+
+go get -d example.net/cmd
+go list example.net/cmd/x++
+
+! go list -versions -m 'example.net/bad++'
+stderr '^go list -m: module example.net/bad\+\+: malformed module path "example.net/bad\+\+": invalid char ''\+''$'
+
+# TODO(bcmills): 'go get -d example.net/cmd/x++' should also work, but currently
+# it does not. This might be fixed by https://golang.org/cl/297891.
+! go get -d example.net/cmd/x++
+stderr '^go get: malformed module path "example.net/cmd/x\+\+": invalid char ''\+''$'
+
+-- go.mod --
+module example.com/m
+
+go 1.16
+
+replace (
+	example.net/cmd => ./cmd
+)
+
+-- cmd/go.mod --
+module example.net/cmd
+
+go 1.16
+-- cmd/x++/main.go --
+package main
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_invalid_version.txt b/src/cmd/go/testdata/script/mod_invalid_version.txt
new file mode 100644
index 0000000..43b9564
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_invalid_version.txt
@@ -0,0 +1,251 @@
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+env GOFLAGS=-mod=mod
+
+# Regression test for golang.org/issue/27173: if the user (or go.mod file)
+# requests a pseudo-version that does not match both the module path and commit
+# metadata, reject it with a helpful error message.
+#
+# TODO(bcmills): Replace the github.com/pierrec/lz4 examples with something
+# equivalent on vcs-test.golang.org.
+
+# An incomplete commit hash is not a valid semantic version,
+# but can appear in the main go.mod file anyway and should be resolved.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 \(replaced by \./\..\): parsing ../go.mod: '$WORK'/gopath/src/go.mod:5: require golang.org/x/text: version "14c0d48ead0c" invalid: must be of the form v1.2.3'
+cd ..
+go list -m golang.org/x/text
+stdout 'golang.org/x/text v0.1.1-0.20170915032832-14c0d48ead0c'
+grep 'golang.org/x/text v0.1.1-0.20170915032832-14c0d48ead0c' go.mod
+
+# A module path below the repo root that does not contain a go.mod file is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text/unicode@v0.0.0-20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text/unicode@v0.0.0-20170915032832-14c0d48ead0c: invalid version: missing golang.org/x/text/unicode/go.mod at revision 14c0d48ead0c'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text/unicode@v0.0.0-20170915032832-14c0d48ead0c: invalid version: missing golang.org/x/text/unicode/go.mod at revision 14c0d48ead0c'
+
+# However, arguments to 'go get' can name packages above the root.
+cp go.mod.orig go.mod
+go get -d golang.org/x/text/unicode@v0.0.0-20170915032832-14c0d48ead0c
+go list -m golang.org/x/text/...
+stdout 'golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c'
+! stdout 'golang.org/x/text/unicode'
+
+# A major version that does not match the module path is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v2.1.1-0.20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 \(replaced by \./\.\.\): parsing ../go.mod: '$WORK'/gopath/src/go.mod:5: require golang.org/x/text: version "v2.1.1-0.20170915032832-14c0d48ead0c" invalid: should be v0 or v1, not v2'
+cd ..
+! go list -m golang.org/x/text
+stderr $WORK'/gopath/src/go.mod:5: require golang.org/x/text: version "v2.1.1-0.20170915032832-14c0d48ead0c" invalid: should be v0 or v1, not v2'
+
+# A pseudo-version with fewer than 12 digits of SHA-1 prefix is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(14c0d48ead0c\)'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0: invalid pseudo-version: revision is shorter than canonical \(14c0d48ead0c\)'
+
+# A pseudo-version with more than 12 digits of SHA-1 prefix is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(14c0d48ead0c\)'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0cd47e3104ada247d91be04afc7a5a: invalid pseudo-version: revision is longer than canonical \(14c0d48ead0c\)'
+
+# A pseudo-version that does not match the commit timestamp is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.1.1-0.20190915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20190915032832-14c0d48ead0c: invalid pseudo-version: does not match version-control timestamp \(expected 20170915032832\)'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.1.1-0.20190915032832-14c0d48ead0c: invalid pseudo-version: does not match version-control timestamp \(expected 20170915032832\)'
+
+# A 'replace' directive in the main module can replace an invalid timestamp
+# with a valid one.
+go mod edit -replace golang.org/x/text@v0.1.1-0.20190915032832-14c0d48ead0c=golang.org/x/text@14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20190915032832-14c0d48ead0c: invalid pseudo-version: does not match version-control timestamp \(expected 20170915032832\)'
+cd ..
+go list -m golang.org/x/text
+stdout 'golang.org/x/text v0.1.1-0.20190915032832-14c0d48ead0c => golang.org/x/text v0.1.1-0.20170915032832-14c0d48ead0c'
+
+# A pseudo-version that is not derived from a tag is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v1.999.999-0.20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v1.999.999-0.20170915032832-14c0d48ead0c: invalid pseudo-version: preceding tag \(v1.999.998\) not found'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v1.999.999-0.20170915032832-14c0d48ead0c: invalid pseudo-version: preceding tag \(v1.999.998\) not found'
+
+# A v1.0.0- pseudo-version that is not derived from a tag is invalid:
+# v1.0.0- implies no tag, but the correct no-tag prefix for a module path
+# without a major-version suffix is v0.0.0-.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v1.0.0-20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v1.0.0-20170915032832-14c0d48ead0c: invalid pseudo-version: major version without preceding tag must be v0, not v1'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v1.0.0-20170915032832-14c0d48ead0c: invalid pseudo-version: major version without preceding tag must be v0, not v1'
+
+# A pseudo-version vX.Y.Z+1 cannot have Z+1 == 0, since that would
+# imply a base tag with a negative patch field.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.0.0-0.20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.0.0-0.20170915032832-14c0d48ead0c: invalid pseudo-version: version before v0.0.0 would have negative patch number'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.0.0-0.20170915032832-14c0d48ead0c: invalid pseudo-version: version before v0.0.0 would have negative patch number'
+
+# A 'replace' directive in the main module can replace an
+# invalid pseudo-version base with a valid one.
+go mod edit -replace golang.org/x/text@v0.0.0-0.20170915032832-14c0d48ead0c=golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.0.0-0.20170915032832-14c0d48ead0c: invalid pseudo-version: version before v0.0.0 would have negative patch number'
+cd ..
+go list -m golang.org/x/text
+stdout 'golang.org/x/text v0.0.0-0.20170915032832-14c0d48ead0c => golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c'
+
+# A 'replace' directive can replace an invalid 'latest' version, and
+# should suppress errors for that version in 'go get -u'
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v1.999999.0
+go mod edit -replace golang.org/x/text@v1.999999.0=golang.org/x/text@v0.0.0-20170915032832-14c0d48ead0c
+cd outside
+! go get -d golang.org/x/text@upgrade
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v1.999999.0: reading golang.org/x/text/go.mod at revision v1.999999.0: unknown revision v1.999999.0'
+cd ..
+go get -d golang.org/x/text@upgrade
+go list -m golang.org/x/text
+stdout 'golang.org/x/text v1.999999.0 => golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c'
+
+# A pseudo-version derived from a non-ancestor tag is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.2.1-0.20170915032832-14c0d48ead0c
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.2.1-0.20170915032832-14c0d48ead0c: invalid pseudo-version: revision 14c0d48ead0c is not a descendent of preceding tag \(v0.2.0\)'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.2.1-0.20170915032832-14c0d48ead0c: invalid pseudo-version: revision 14c0d48ead0c is not a descendent of preceding tag \(v0.2.0\)'
+
+# A pseudo-version derived from a canonical tag on the same revision is invalid.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac: invalid pseudo-version: tag \(v0.2.0\) found on revision c4d099d611ac is already canonical, so should not be replaced with a pseudo-version derived from that tag'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.2.1-0.20171213102548-c4d099d611ac: invalid pseudo-version: tag \(v0.2.0\) found on revision c4d099d611ac is already canonical, so should not be replaced with a pseudo-version derived from that tag'
+
+# A +incompatible suffix is not allowed on a version that is actually compatible.
+cp go.mod.orig go.mod
+go mod edit -require golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0c+incompatible
+cd outside
+! go list -m golang.org/x/text
+stderr 'go: example.com@v0.0.0 requires\n\tgolang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0c\+incompatible: invalid version: \+incompatible suffix not allowed: major version v0 is compatible'
+cd ..
+! go list -m golang.org/x/text
+stderr 'golang.org/x/text@v0.1.1-0.20170915032832-14c0d48ead0c\+incompatible: invalid version: \+incompatible suffix not allowed: major version v0 is compatible'
+
+# The pseudo-version for a commit after a tag with a non-matching major version
+# should instead be based on the last matching tag.
+cp go.mod.orig go.mod
+go mod edit -require github.com/pierrec/lz4@473cd7ce01a1
+go list -m github.com/pierrec/lz4
+stdout 'github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1'
+cd outside
+go list -m github.com/pierrec/lz4
+stdout 'github.com/pierrec/lz4 v1.0.2-0.20190131084431-473cd7ce01a1'
+cd ..
+
+# A +incompatible pseudo-version for a module that has an explicit go.mod file is invalid.
+cp go.mod.orig go.mod
+go mod edit -require github.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d+incompatible
+cd outside
+! go list -m github.com/pierrec/lz4
+stderr 'go: example.com@v0.0.0 requires\n\tgithub.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+cd ..
+! go list -m github.com/pierrec/lz4
+stderr 'github.com/pierrec/lz4@v2.0.9-0.20190209155647-9a39efadad3d\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+
+# A +incompatible pseudo-version is valid for a revision of the module
+# that lacks a go.mod file.
+cp go.mod.orig go.mod
+go mod edit -require github.com/pierrec/lz4@v2.0.4-0.20180826165652-dbe9298ce099+incompatible
+cd outside
+go list -m github.com/pierrec/lz4
+stdout 'github.com/pierrec/lz4 v2.0.4-0.20180826165652-dbe9298ce099\+incompatible'
+cd ..
+go list -m github.com/pierrec/lz4
+stdout 'github.com/pierrec/lz4 v2.0.4-0.20180826165652-dbe9298ce099\+incompatible'
+
+# 'go get' for a mismatched major version without a go.mod file should resolve
+# to the equivalent +incompatible version, not a pseudo-version with a different
+# major version.
+cp go.mod.orig go.mod
+go get -d github.com/pierrec/lz4@v2.0.5
+go list -m github.com/pierrec/lz4
+stdout 'github.com/pierrec/lz4 v2.0.5\+incompatible'
+
+# 'go get' for a mismatched major version with a go.mod file should error out,
+# not resolve to a pseudo-version with a different major version.
+cp go.mod.orig go.mod
+! go get -d github.com/pierrec/lz4@v2.0.8
+stderr 'go get: github.com/pierrec/lz4@v2.0.8: invalid version: module contains a go.mod file, so major version must be compatible: should be v0 or v1, not v2'
+
+# An invalid +incompatible suffix for a canonical version should error out,
+# not resolve to a pseudo-version.
+#
+# TODO(bcmills): The "outside" view for this failure mode is missing its import stack.
+# Figure out why and fix it.
+cp go.mod.orig go.mod
+go mod edit -require github.com/pierrec/lz4@v2.0.8+incompatible
+cd outside
+! go list -m github.com/pierrec/lz4
+stderr 'github.com/pierrec/lz4@v2.0.8\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+cd ..
+! go list -m github.com/pierrec/lz4
+stderr 'github.com/pierrec/lz4@v2.0.8\+incompatible: invalid version: \+incompatible suffix not allowed: module contains a go.mod file, so semantic import versioning is required'
+
+-- go.mod.orig --
+module example.com
+
+go 1.13
+-- outside/go.mod --
+module example.com/outside
+
+go 1.13
+
+require example.com v0.0.0
+replace example.com v0.0.0 => ./..
diff --git a/src/cmd/go/testdata/script/mod_issue35317.txt b/src/cmd/go/testdata/script/mod_issue35317.txt
new file mode 100644
index 0000000..b1852ab
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_issue35317.txt
@@ -0,0 +1,8 @@
+# Regression test for golang.org/issue/35317:
+# 'go get' with multiple module-only arguments was racy.
+
+env GO111MODULE=on
+[short] skip
+
+go mod init example.com
+go get -d golang.org/x/text@v0.3.0 golang.org/x/internal@v0.1.0 golang.org/x/exp@none
diff --git a/src/cmd/go/testdata/script/mod_lazy_downgrade.txt b/src/cmd/go/testdata/script/mod_lazy_downgrade.txt
new file mode 100644
index 0000000..1e84820
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_lazy_downgrade.txt
@@ -0,0 +1,145 @@
+# This test illustrates the interaction between lazy loading and downgrading in
+# 'go get.
+
+# The package import graph used in this test looks like:
+#
+# lazy ---- a
+#           |
+#           a_test ---- b
+#                       b_test ---- c
+#
+# The module dependency graph initially looks like:
+#
+# lazy ---- a.1 ---- b.1 ---- c.1
+#      \                     /
+#        b.3 ---- c.2    b.2
+#
+# (Note that lazy loading will prune out the dependency from b.1 on c.1.)
+
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod.orig go.mod
+
+go list -m all
+stdout '^example.com/a v0.1.0 '
+stdout '^example.com/b v0.3.0 '
+stdout '^example.com/c v0.2.0 '
+
+# Downgrading c should also downgrade the b that requires it.
+
+go get -d example.com/c@v0.1.0
+go list -m all
+stdout '^example.com/a v0.1.0 '
+stdout '^example.com/b v0.2.0 '
+stdout '^example.com/c v0.1.0 '
+
+# Removing c entirely should also remove the a and b that require it.
+
+go get -d example.com/c@none
+go list -m all
+! stdout '^example.com/a '
+! stdout '^example.com/b '
+! stdout '^example.com/c '
+
+
+# With lazy loading, downgrading c should work the same way, but dependencies
+# outside of the deepening scan should not affect the downgrade.
+
+cp go.mod.orig go.mod
+go mod edit -go=1.16
+
+go list -m all
+stdout '^example.com/a v0.1.0 '
+stdout '^example.com/b v0.3.0 '
+stdout '^example.com/c v0.2.0 '
+
+go get -d example.com/c@v0.1.0
+go list -m all
+stdout '^example.com/a v0.1.0 '
+stdout '^example.com/b v0.2.0 '
+stdout '^example.com/c v0.1.0 '
+
+go get -d example.com/c@none
+go list -m all
+! stdout '^example.com/a '  # TODO(#36460): example.com/a v0.1.0
+! stdout '^example.com/b '  # TODO(#36460): example.com/b v0.1.0
+! stdout '^example.com/c '
+
+-- go.mod --
+module example.com/lazy
+
+go 1.15
+
+require (
+	example.com/a v0.1.0
+	example.com/b v0.3.0 // indirect
+)
+
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/b v0.1.0 => ./b1
+	example.com/b v0.2.0 => ./b2
+	example.com/b v0.3.0 => ./b3
+	example.com/c v0.1.0 => ./c
+	example.com/c v0.2.0 => ./c
+)
+-- lazy.go --
+package lazy
+
+import _ "example.com/a"
+
+-- a/go.mod --
+module example.com/a
+
+go 1.15
+
+require example.com/b v0.1.0
+-- a/a.go --
+package a
+-- a/a_test.go --
+package a_test
+
+import _ "example.com/b"
+
+-- b1/go.mod --
+module example.com/b
+
+go 1.15
+
+require example.com/c v0.1.0
+-- b1/b.go --
+package b
+-- b1/b_test.go --
+package b_test
+import _ "example.com/c"
+
+-- b2/go.mod --
+module example.com/b
+
+go 1.15
+
+require example.com/c v0.1.0
+-- b2/b.go --
+package b
+-- b2/b_test.go --
+package b_test
+import _ "example.com/c"
+
+-- b3/go.mod --
+module example.com/b
+
+go 1.15
+
+require example.com/c v0.2.0
+-- b3/b.go --
+package b
+-- b3/b_test.go --
+package b_test
+import _ "example.com/c"
+
+-- c/go.mod --
+module example.com/c
+
+go 1.15
+-- c/c.go --
+package c
diff --git a/src/cmd/go/testdata/script/mod_lazy_import_allmod.txt b/src/cmd/go/testdata/script/mod_lazy_import_allmod.txt
new file mode 100644
index 0000000..4ad8cbf
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_lazy_import_allmod.txt
@@ -0,0 +1,172 @@
+# This test demonstrates dependency resolution when the main module imports a
+# new package from a previously-test-only dependency.
+#
+# When lazy loading is active, the loader will not load dependencies of any
+# module whose packages are *only* imported by tests outside the main module. If
+# the main module is changed to import a package from such a module, the
+# dependencies of that module will need to be reloaded.
+
+# The import graph used in this test looks like:
+#
+# m ---- a
+#  \     |
+#   \    a_test ---- b/x
+#    \
+#      --------------b/y (new) ---- c
+#
+# Where b/x and b/y are disjoint packages, but both contained in module b.
+#
+# The module dependency graph initially looks like:
+#
+# m ---- a.1 ---- b.1 ---- c.1
+#
+# This configuration is similar to that used in mod_lazy_new_import,
+# but the new import is from what is initially a test-only dependency.
+
+# Control case: in Go 1.14, the original go.mod is tidy,
+# and the dependency on c is eagerly loaded.
+
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod.orig go.mod
+
+go list -m all
+stdout '^a v0.1.0 '
+stdout '^b v0.1.0 '
+stdout '^c v0.1.0 '
+
+# After adding a new import of b/y,
+# the import of c from b/y should resolve to the version required by b.
+
+cp m.go m.go.orig
+cp m.go.new m.go
+go mod tidy
+cmp go.mod.new go.mod
+
+go list -m all
+stdout '^a v0.1.0 '
+stdout '^b v0.1.0 '
+stdout '^c v0.1.0 '
+
+# With lazy loading, the go.mod requirements are the same,
+# but the dependency on c is initially pruned out.
+
+cp m.go.orig m.go
+cp go.mod.orig go.mod
+go mod edit -go=1.16
+go mod edit -go=1.16 go.mod.new
+
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod.orig go.mod
+
+go list -m all
+stdout '^a v0.1.0 '
+stdout '^b v0.1.0 '
+stdout '^c v0.1.0 '  # TODO(#36460): This should be pruned out.
+
+# After adding a new import of b/y,
+# the import of c from b/y should again resolve to the version required by b.
+
+cp m.go.new m.go
+go mod tidy
+cmp go.mod.new go.mod
+
+go list -m all
+stdout '^a v0.1.0 '
+stdout '^b v0.1.0 '
+stdout '^c v0.1.0 '
+
+-- m.go --
+package main
+
+import (
+	"fmt"
+
+	_ "a"  // a_test imports b/x.
+)
+
+func main() {
+}
+-- m.go.new --
+package main
+
+import (
+	"fmt"
+
+	_ "a"  // a_test imports b/x.
+	"b/y"  // This is a new import, not yet reflected in the go.mod file.
+)
+
+func main() {
+	fmt.Println(b.CVersion())
+}
+-- go.mod --
+module m
+
+go 1.14
+
+require a v0.1.0
+
+replace (
+	a v0.1.0 => ./a1
+	b v0.1.0 => ./b1
+	c v0.1.0 => ./c1
+	c v0.2.0 => ./c2
+)
+-- go.mod.new --
+module m
+
+go 1.14
+
+require (
+	a v0.1.0
+	b v0.1.0
+)
+
+replace (
+	a v0.1.0 => ./a1
+	b v0.1.0 => ./b1
+	c v0.1.0 => ./c1
+	c v0.2.0 => ./c2
+)
+-- a1/go.mod --
+module a
+
+go 1.16
+
+require b v0.1.0
+-- a1/a.go --
+package a
+-- a1/a_test.go --
+package a_test
+
+import _ "b/x"
+-- b1/go.mod --
+module b
+
+go 1.16
+
+require c v0.1.0
+-- b1/x/x.go --
+package x
+-- b1/y/y.go --
+package y
+
+import "c"
+
+func CVersion() string {
+	return c.Version
+}
+-- c1/go.mod --
+module c
+
+go 1.16
+-- c1/c.go --
+package c
+
+const Version = "v0.1.0"
+-- c2/go.mod --
+This file should be unused.
+-- c2/c.go --
+This file should be unused.
diff --git a/src/cmd/go/testdata/script/mod_lazy_new_import.txt b/src/cmd/go/testdata/script/mod_lazy_new_import.txt
new file mode 100644
index 0000000..02935bf
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_lazy_new_import.txt
@@ -0,0 +1,107 @@
+# This test illustrates the use of a deepening scan to resolve transitive
+# imports of imports of new packages from within existing dependencies.
+
+# The package import graph used in this test looks like:
+#
+# lazy ---- a/x ---- b
+#     \
+#      ---- a/y ---- c
+#
+# Where a/x and x/y are disjoint packages, but both contained in module a.
+#
+# The module dependency graph initially looks like:
+#
+# lazy ---- a.1 ---- b.1
+#              \
+#               c.1
+
+
+cp go.mod go.mod.old
+cp lazy.go lazy.go.old
+go mod tidy
+cmp go.mod go.mod.old
+
+# Before adding a new import, the go.mod file should
+# enumerate modules for all packages already imported.
+go list all
+cmp go.mod go.mod.old
+
+# When we add a new import of a package in an existing dependency,
+# and that dependency is already tidy, its transitive dependencies
+# should already be present.
+cp lazy.go.new lazy.go
+go list all
+go list -m all
+stdout '^example.com/c v0.1.0' # not v0.2.0 as would be be resolved by 'latest'
+cmp go.mod go.mod.old
+
+# TODO(#36460):
+cp lazy.go.old lazy.go
+cp go.mod.old go.mod
+go mod edit -go=1.16
+
+# When a new import is found, we should perform a deepening scan of the existing
+# dependencies and add a requirement on the version required by those
+# dependencies — not re-resolve 'latest'.
+
+
+-- go.mod --
+module example.com/lazy
+
+go 1.15
+
+require example.com/a v0.1.0
+
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/b v0.1.0 => ./b
+	example.com/c v0.1.0 => ./c1
+	example.com/c v0.2.0 => ./c2
+)
+-- lazy.go --
+package lazy
+
+import (
+	_ "example.com/a/x"
+)
+-- lazy.go.new --
+package lazy
+
+import (
+	_ "example.com/a/x"
+	_ "example.com/a/y"
+)
+-- a/go.mod --
+module example.com/a
+
+go 1.15
+
+require (
+	example.com/b v0.1.0
+	example.com/c v0.1.0
+)
+-- a/x/x.go --
+package x
+import _ "example.com/b"
+-- a/y/y.go --
+package y
+import _ "example.com/c"
+-- b/go.mod --
+module example.com/b
+
+go 1.15
+-- b/b.go --
+package b
+-- c1/go.mod --
+module example.com/c
+
+go 1.15
+-- c1/c.go --
+package c
+-- c2/go.mod --
+module example.com/c
+
+go 1.15
+-- c2/c.go --
+package c
+This file should not be used, so this syntax error should be ignored.
diff --git a/src/cmd/go/testdata/script/mod_lazy_test_horizon.txt b/src/cmd/go/testdata/script/mod_lazy_test_horizon.txt
new file mode 100644
index 0000000..9cdfad7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_lazy_test_horizon.txt
@@ -0,0 +1,131 @@
+# This file demonstrates the effect of lazy loading on the selected
+# versions of test dependencies.
+
+# The package import graph used in this test looks like:
+#
+# m ---- a
+#  \     |
+#   \    a_test ---- b
+#    \               |
+#     x              b_test
+#     |                    \
+#     x_test -------------- c
+#
+# And the module dependency graph looks like:
+#
+# m -- a.1 -- b.1 -- c.2
+#  \
+#   x.1 ------------ c.1
+
+# Control case: in Go 1.15, the version of c imported by 'go test x' is the
+# version required by module b, even though b_test is not relevant to the main
+# module. (The main module imports a, and a_test imports b, but all of the
+# packages and tests in the main module can be built without b.)
+
+go list -m c
+stdout '^c v0.2.0 '
+
+[!short] go test -v x
+[!short] stdout ' c v0.2.0$'
+
+# With lazy loading, the go.mod requirements are the same,
+# but the irrelevant dependency on c v0.2.0 should be pruned out,
+# leaving only the relevant dependency on c v0.1.0.
+
+go mod edit -go=1.16
+go list -m c
+stdout '^c v0.2.0'  # TODO(#36460): v0.1.0
+
+[!short] go test -v x
+[!short] stdout ' c v0.2.0$'  # TODO(#36460): v0.1.0
+
+-- m.go --
+package m
+
+import (
+	_ "a"
+	_ "x"
+)
+-- go.mod --
+module m
+
+go 1.15
+
+require (
+	a v0.1.0
+	x v0.1.0
+)
+
+replace (
+	a v0.1.0 => ./a1
+	b v0.1.0 => ./b1
+	c v0.1.0 => ./c1
+	c v0.2.0 => ./c2
+	x v0.1.0 => ./x1
+)
+-- a1/go.mod --
+module a
+
+go 1.16
+
+require b v0.1.0
+-- a1/a.go --
+package a
+-- a1/a_test.go --
+package a_test
+
+import _ "b"
+-- b1/go.mod --
+module b
+
+go 1.16
+
+require c v0.2.0
+-- b1/b.go --
+package b
+-- b1/b_test.go --
+package b_test
+
+import (
+	"c"
+	"testing"
+)
+
+func TestCVersion(t *testing.T) {
+	t.Log(c.Version)
+}
+-- c1/go.mod --
+module c
+
+go 1.16
+-- c1/c.go --
+package c
+
+const Version = "v0.1.0"
+-- c2/go.mod --
+module c
+
+go 1.16
+-- c2/c.go --
+package c
+
+const Version = "v0.2.0"
+-- x1/go.mod --
+module x
+
+go 1.16
+
+require c v0.1.0
+-- x1/x.go --
+package x
+-- x1/x_test.go --
+package x_test
+
+import (
+	"c"
+	"testing"
+)
+
+func TestCVersion(t *testing.T) {
+	t.Log("c", c.Version)
+}
diff --git a/src/cmd/go/testdata/script/mod_lazy_test_of_test_dep.txt b/src/cmd/go/testdata/script/mod_lazy_test_of_test_dep.txt
new file mode 100644
index 0000000..ca6c550
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_lazy_test_of_test_dep.txt
@@ -0,0 +1,145 @@
+# This file demonstrates the effect of lazy loading on the reproducibility of
+# tests (and tests of test dependencies) outside the main module.
+#
+# It is similar to the cases in mod_all.txt and mod_lazy_test_horizon.txt, but
+# focuses on the effect of "go test" on specific packages instead of the "all"
+# pattern.
+
+# The package import graph used in this test looks like:
+#
+# lazy ---- a
+#           |
+#           a_test ---- b
+#                       |
+#                       b_test ---- c
+#
+# And the non-lazy module dependency graph looks like:
+#
+# lazy ---- a.1 ---- b.1 ---- c.1
+
+cp go.mod go.mod.old
+go mod tidy
+cmp go.mod go.mod.old
+
+# In Go 1.15 mode, 'go list -m all' includes modules needed by the
+# transitive closure of tests of dependencies of tests of dependencies of ….
+
+go list -m all
+stdout 'example.com/b v0.1.0'
+stdout 'example.com/c v0.1.0'
+cmp go.mod go.mod.old
+
+# 'go test' (or equivalent) of any such dependency, no matter how remote, does
+# not update the go.mod file.
+
+go list -test -deps example.com/a
+stdout example.com/b
+! stdout example.com/c
+
+[!short] go test -c example.com/a
+[!short] cmp go.mod go.mod.old
+
+go list -test -deps example.com/b
+stdout example.com/c
+
+[!short] go test -c example.com/b
+[!short] cmp go.mod go.mod.old
+
+# TODO(#36460):
+
+# After changing to 'go 1.16` uniformly, 'go list -m all' should prune out
+# example.com/c, because it is not imported by any package (or test of a package)
+# transitively imported by the main module.
+#
+# example.com/a is imported,
+# and example.com/b is needed in order to run 'go test example.com/a',
+# but example.com/c is not needed because we don't expect the user to need to run
+# 'go test example.com/b'.
+
+# If we skip directly to adding a new import of c, the dependency is too far
+# away for a deepening scan to find, which is fine because the package whose
+# test imported it wasn't even it "all". It should resolve from the latest
+# version of its module.
+
+# However, if we reach c by running successive tests starting from the main
+# module, we should end up with exactly the version require by c, with an update
+# to the go.mod file as soon as we test a test dependency that is not itself in
+# "all".
+
+-- go.mod --
+module example.com/lazy
+
+go 1.15
+
+require example.com/a v0.1.0
+
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/b v0.1.0 => ./b1
+	example.com/b v0.2.0 => ./b2
+	example.com/c v0.1.0 => ./c1
+	example.com/c v0.2.0 => ./c2
+)
+-- lazy.go --
+package lazy
+
+import (
+	_ "example.com/a"
+)
+-- a/go.mod --
+module example.com/a
+
+go 1.15
+
+require example.com/b v0.1.0
+-- a/a.go --
+package a
+-- a/a_test.go --
+package a
+
+import (
+	"testing"
+
+	_ "example.com/b"
+)
+
+func TestUsingB(t *testing.T) {
+	// …
+}
+-- b1/go.mod --
+module example.com/b
+
+go 1.15
+
+require example.com/c v0.1.0
+-- b1/b.go --
+package b
+-- b1/b_test.go --
+package b
+
+import _ "example.com/c"
+-- b2/go.mod --
+module example.com/b
+
+go 1.15
+
+require example.com/c v0.1.0
+-- b2/b.go --
+package b
+This file should not be used, so this syntax error should be ignored.
+-- b2/b_test.go --
+package b
+This file should not be used, so this syntax error should be ignored.
+-- c1/go.mod --
+module example.com/c
+
+go 1.15
+-- c1/c.go --
+package c
+-- c2/go.mod --
+module example.com/c
+
+go 1.15
+-- c2/c.go --
+package c
+This file should not be used, so this syntax error should be ignored.
diff --git a/src/cmd/go/testdata/script/mod_list.txt b/src/cmd/go/testdata/script/mod_list.txt
new file mode 100644
index 0000000..1ba6d7c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list.txt
@@ -0,0 +1,61 @@
+env GO111MODULE=on
+[short] skip
+
+# list {{.Dir}} shows main module and go.mod but not not-yet-downloaded dependency dir.
+go list -mod=mod -m -f '{{.Path}} {{.Main}} {{.GoMod}} {{.Dir}}' all
+stdout '^x true .*[\\/]src[\\/]go.mod .*[\\/]src$'
+stdout '^rsc.io/quote false .*[\\/]v1.5.2.mod $'
+
+# list {{.Dir}} shows dependency after download (and go list without -m downloads it)
+go list -mod=mod -f '{{.Dir}}' rsc.io/quote
+stdout '.*mod[\\/]rsc.io[\\/]quote@v1.5.2$'
+
+# downloaded dependencies are read-only
+exists -readonly $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+exists -readonly $GOPATH/pkg/mod/rsc.io/quote@v1.5.2/buggy
+
+# go clean -modcache can delete read-only dependencies
+go clean -modcache
+! exists $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+
+# list {{.Dir}} shows replaced directories
+cp go.mod2 go.mod
+go list -mod=mod -f {{.Dir}} rsc.io/quote
+go list -m -f '{{.Path}} {{.Version}} {{.Dir}}{{with .Replace}} {{.GoMod}} => {{.Version}} {{.Dir}} {{.GoMod}}{{end}}' all
+stdout 'mod[\\/]rsc.io[\\/]quote@v1.5.1'
+stdout 'v1.3.0.*mod[\\/]rsc.io[\\/]sampler@v1.3.1 .*[\\/]v1.3.1.mod => v1.3.1.*sampler@v1.3.1 .*[\\/]v1.3.1.mod'
+
+# list std should work
+go list std
+stdout ^math/big
+
+# rsc.io/quote/buggy should be listable as a package
+go list -mod=mod rsc.io/quote/buggy
+
+# rsc.io/quote/buggy should not be listable as a module
+go list -m -e -f '{{.Error.Err}}' nonexist rsc.io/quote/buggy
+stdout '^module nonexist: not a known dependency$'
+stdout '^module rsc.io/quote/buggy: not a known dependency$'
+
+! go list -m nonexist rsc.io/quote/buggy
+stderr '^go list -m: module nonexist: not a known dependency'
+stderr '^go list -m: module rsc.io/quote/buggy: not a known dependency'
+
+# Module loader does not interfere with list -e (golang.org/issue/24149).
+go list -e -f '{{.Error.Err}}' database
+stdout 'no Go files in '
+! go list database
+stderr 'no Go files in '
+
+-- go.mod --
+module x
+require rsc.io/quote v1.5.2
+
+-- go.mod2 --
+module x
+require rsc.io/quote v1.5.1
+replace rsc.io/sampler v1.3.0 => rsc.io/sampler v1.3.1
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_list_bad_import.txt b/src/cmd/go/testdata/script/mod_list_bad_import.txt
new file mode 100644
index 0000000..b128408
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_bad_import.txt
@@ -0,0 +1,75 @@
+# This test matches list_bad_import, but in module mode.
+# Please keep them in sync.
+
+env GO111MODULE=on
+cd example.com
+
+# Without -e, listing an otherwise-valid package with an unsatisfied direct import should fail.
+# BUG: Today it succeeds.
+go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}} {{range .DepsErrors}}bad dep: {{.Err}}{{end}}' example.com/direct
+! stdout ^error
+stdout 'incomplete'
+stdout 'bad dep: .*example.com/notfound'
+
+# Listing with -deps should also fail.
+! go list -deps example.com/direct
+stderr example.com/notfound
+
+# But -e -deps should succeed.
+go list -e -deps example.com/direct
+stdout example.com/notfound
+
+
+# Listing an otherwise-valid package that imports some *other* package with an
+# unsatisfied import should also fail.
+# BUG: Today, it succeeds.
+go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}} {{range .DepsErrors}}bad dep: {{.Err}}{{end}}' example.com/indirect
+! stdout ^error
+stdout incomplete
+stdout 'bad dep: .*example.com/notfound'
+
+# Again, -deps should fail.
+! go list -deps example.com/indirect
+stderr example.com/notfound
+
+# But -e -deps should succeed.
+go list -e -deps example.com/indirect
+stdout example.com/notfound
+
+
+# Listing the missing dependency directly should fail outright...
+! go list -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}}' example.com/notfound
+stderr 'no required module provides package example.com/notfound; to add it:\n\tgo get example.com/notfound'
+! stdout error
+! stdout incomplete
+
+# ...but listing with -e should succeed.
+go list -e -f '{{if .Error}}error{{end}} {{if .Incomplete}}incomplete{{end}}' example.com/notfound
+stdout error
+stdout incomplete
+
+
+# The pattern "all" should match only packages that actually exist,
+# ignoring those whose existence is merely implied by imports.
+go list -e -f '{{.ImportPath}} {{.Error}}' all
+stdout example.com/direct
+stdout example.com/indirect
+# TODO: go list creates a dummy package with the import-not-found
+# but really the Error belongs on example.com/direct, and this package
+# should not be printed.
+# ! stdout example.com/notfound
+
+
+-- example.com/go.mod --
+module example.com
+
+-- example.com/direct/direct.go --
+package direct
+import _ "example.com/notfound"
+
+-- example.com/indirect/indirect.go --
+package indirect
+import _ "example.com/direct"
+
+-- example.com/notfound/README --
+This directory intentionally left blank.
diff --git a/src/cmd/go/testdata/script/mod_list_compiled_concurrent.txt b/src/cmd/go/testdata/script/mod_list_compiled_concurrent.txt
new file mode 100644
index 0000000..b08713d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_compiled_concurrent.txt
@@ -0,0 +1,41 @@
+env GO111MODULE=on
+
+[short] skip
+
+# Regression test for golang.org/issue/29667:
+# spurious 'failed to cache compiled Go files' errors.
+# This test failed reliably when run with -count=10
+# on a Linux workstation.
+
+env GOCACHE=$WORK/gocache
+mkdir $GOCACHE
+
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+go list -json -compiled -test=false -export=false -deps=true -- . &
+
+wait
+
+-- go.mod --
+module sandbox/bar
+-- bar.go --
+package bar
+
+import "C"
diff --git a/src/cmd/go/testdata/script/mod_list_dir.txt b/src/cmd/go/testdata/script/mod_list_dir.txt
new file mode 100644
index 0000000..1adab8f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_dir.txt
@@ -0,0 +1,36 @@
+[short] skip
+
+# go list with path to directory should work
+
+# populate go.sum
+go get -d
+
+env GO111MODULE=off
+go list -f '{{.ImportPath}}' $GOROOT/src/math
+stdout ^math$
+
+env GO111MODULE=on
+go list -f '{{.ImportPath}}' $GOROOT/src/math
+stdout ^math$
+go list -f '{{.ImportPath}}' .
+stdout ^x$
+
+go mod download rsc.io/quote@v1.5.2
+go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+stdout '^rsc.io/quote$'
+go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/sampler@v1.3.0
+stdout '^rsc.io/sampler$'
+go get -d rsc.io/sampler@v1.3.1
+go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/sampler@v1.3.1
+stdout '^rsc.io/sampler$'
+! go list -f '{{.ImportPath}}' $GOPATH/pkg/mod/rsc.io/sampler@v1.3.0
+stderr 'outside available modules'
+
+-- go.mod --
+module x
+require rsc.io/quote v1.5.2
+
+-- x.go --
+package x
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_list_direct.txt b/src/cmd/go/testdata/script/mod_list_direct.txt
new file mode 100644
index 0000000..62a472f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_direct.txt
@@ -0,0 +1,24 @@
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+[!net] skip
+[!exec:git] skip
+
+# golang.org/issue/33099: if an import path ends in a major-version suffix,
+# ensure that 'direct' mode can resolve the package to the module.
+# For a while, (*modfetch.codeRepo).Stat was not checking for a go.mod file,
+# which would produce a hard error at the subsequent call to GoMod.
+
+go get -d
+
+-- go.mod --
+module example.com
+go 1.13
+
+-- main.go --
+package main
+
+import _ "vcs-test.golang.org/git/v3pkg.git/v3"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_list_e_readonly.txt b/src/cmd/go/testdata/script/mod_list_e_readonly.txt
new file mode 100644
index 0000000..4969434
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_e_readonly.txt
@@ -0,0 +1,15 @@
+# 'go list -mod=readonly -e should attribute errors
+# to individual missing packages.
+# Verifies golang.org/issue/34829.
+go list -mod=readonly -e -deps -f '{{if .Error}}{{.ImportPath}}: {{.Error}}{{end}}' .
+stdout 'example.com/missing: use.go:3:8: cannot find module providing package example.com/missing: import lookup disabled by -mod=readonly'
+
+-- go.mod --
+module example.com/m
+
+go 1.14
+
+-- use.go --
+package use
+
+import _ "example.com/missing"
diff --git a/src/cmd/go/testdata/script/mod_list_pseudo.txt b/src/cmd/go/testdata/script/mod_list_pseudo.txt
new file mode 100644
index 0000000..056c093
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_pseudo.txt
@@ -0,0 +1,39 @@
+env GO111MODULE=on
+
+# Regression test for golang.org/issue/32715.
+
+# When using $GOPATH/pkg/mod/cache/download as a proxy,
+# 'latest' queries should prefer tagged versions over pseudo-versions.
+
+go mod download github.com/dmitshur-test/modtest5@v0.0.0-20190619020302-197a620e0c9a
+go mod download github.com/dmitshur-test/modtest5@v0.5.0-alpha
+go mod download github.com/dmitshur-test/modtest5@v0.5.0-alpha.0.20190619023908-3da23a9deb9e
+cmp $GOPATH/pkg/mod/cache/download/github.com/dmitshur-test/modtest5/@v/list $WORK/modtest5.list
+
+env GOSUMDB=off # don't verify go.mod files when loading retractions
+env GOPROXY=file:///$GOPATH/pkg/mod/cache/download
+env GOPATH=$WORK/gopath2
+mkdir $GOPATH
+
+go list -m -f '{{.Path}} {{.Version}} {{.Time.Format "2006-01-02"}}' github.com/dmitshur-test/modtest5@latest
+stdout '^github.com/dmitshur-test/modtest5 v0.5.0-alpha 2019-06-18$'
+
+# If the module proxy contains only pseudo-versions, 'latest' should stat
+# the version with the most recent timestamp — not the highest semantic
+# version — and return its metadata.
+env GOPROXY=file:///$WORK/tinyproxy
+go list -m -f '{{.Path}} {{.Version}} {{.Time.Format "2006-01-02"}}' dmitri.shuralyov.com/test/modtest3@latest
+stdout '^dmitri.shuralyov.com/test/modtest3 v0.0.0-20181023043359-a85b471d5412 2018-10-22$'
+
+-- $WORK/modtest5.list --
+v0.0.0-20190619020302-197a620e0c9a
+v0.5.0-alpha
+v0.5.0-alpha.0.20190619023908-3da23a9deb9e
+-- $WORK/tinyproxy/dmitri.shuralyov.com/test/modtest3/@v/list --
+v0.1.0-0.20161023043300-000000000000
+v0.0.0-20181023043359-a85b471d5412
+-- $WORK/tinyproxy/dmitri.shuralyov.com/test/modtest3/@v/v0.0.0-20181023043359-a85b471d5412.info --
+{
+	"Version": "v0.0.0-20181023043359-a85b471d5412",
+	"Time": "2018-10-22T21:33:59-07:00"
+}
diff --git a/src/cmd/go/testdata/script/mod_list_replace_dir.txt b/src/cmd/go/testdata/script/mod_list_replace_dir.txt
new file mode 100644
index 0000000..f2f2d2b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_replace_dir.txt
@@ -0,0 +1,27 @@
+# Test that "go list" succeeds when given a directory in a replacement
+# module within the module cache.
+# Verifies golang.org/issue/29548
+
+# Populate go.sum and download dependencies.
+go get -d
+
+# Ensure v1.5.2 is also in the cache so we can list it.
+go mod download rsc.io/quote@v1.5.2
+
+! go list $GOPATH/pkg/mod/rsc.io/quote@v1.5.2
+stderr '^directory ..[/\\]pkg[/\\]mod[/\\]rsc.io[/\\]quote@v1.5.2 outside available modules$'
+
+go list $GOPATH/pkg/mod/rsc.io/quote@v1.5.1
+stdout 'rsc.io/quote'
+
+-- go.mod --
+module example.com/quoter
+
+require rsc.io/quote v1.5.2
+
+replace rsc.io/quote => rsc.io/quote v1.5.1
+
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_list_retract.txt b/src/cmd/go/testdata/script/mod_list_retract.txt
new file mode 100644
index 0000000..3ba53bc
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_retract.txt
@@ -0,0 +1,108 @@
+# 'go list -mod=vendor -retracted' reports an error.
+go mod vendor
+! go list -m -retracted -mod=vendor
+stderr '^go list -retracted cannot be used when vendoring is enabled$'
+rm vendor
+
+# 'go list -retracted' reports an error in GOPATH mode.
+env GO111MODULE=off
+! go list -retracted
+stderr '^go list -retracted can only be used in module-aware mode$'
+env GO111MODULE=
+
+# 'go list pkg' does not show retraction.
+go list -f '{{with .Module}}{{with .Retracted}}retracted{{end}}{{end}}' example.com/retract
+! stdout .
+
+# 'go list -retracted pkg' shows retraction.
+go list -retracted -f '{{with .Module}}{{with .Retracted}}retracted{{end}}{{end}}' example.com/retract
+stdout retracted
+
+# 'go list -m' does not show retraction.
+go list -m -f '{{with .Retracted}}retracted{{end}}' example.com/retract
+! stdout .
+
+# 'go list -m -retracted' shows retraction.
+go list -m -retracted -f '{{with .Retracted}}retracted{{end}}' example.com/retract
+
+# 'go list -m mod@version' does not show retraction.
+go list -m -f '{{with .Retracted}}retracted{{end}}' example.com/retract@v1.0.0-unused
+! stdout .
+
+# 'go list -m -retracted mod@version' shows an error if the go.mod that should
+# contain the retractions is not available.
+! go list -m -retracted example.com/retract/missingmod@v1.0.0
+stderr '^go list -m: loading module retractions for example.com/retract/missingmod@v1.0.0: .*404 Not Found$'
+go list -e -m -retracted -f '{{.Error.Err}}' example.com/retract/missingmod@v1.0.0
+stdout '^loading module retractions for example.com/retract/missingmod@v1.0.0: .*404 Not Found$'
+
+# 'go list -m -retracted mod@version' shows retractions.
+go list -m -retracted example.com/retract@v1.0.0-unused
+stdout '^example.com/retract v1.0.0-unused \(retracted\)$'
+go list -m -retracted -f '{{with .Retracted}}retracted{{end}}' example.com/retract@v1.0.0-unused
+stdout retracted
+
+# 'go list -m mod@latest' selects a previous release version, not self-retracted latest.
+go list -m -f '{{.Version}}{{with .Retracted}} retracted{{end}}' example.com/retract/self/prev@latest
+stdout '^v1.1.0$'
+
+# 'go list -m -retracted mod@latest' selects the self-retracted latest version.
+go list -m -retracted -f '{{.Version}}{{with .Retracted}} retracted{{end}}' example.com/retract/self/prev@latest
+stdout '^v1.9.0 retracted$'
+
+# 'go list -m mod@latest' selects a pre-release version if all release versions are retracted.
+go list -m -f '{{.Version}}{{with .Retracted}} retracted{{end}}' example.com/retract/self/prerelease@latest
+stdout '^v1.9.1-pre$'
+
+# 'go list -m -retracted mod@latest' selects the self-retracted latest version.
+go list -m -retracted -f '{{.Version}}{{with .Retracted}} retracted{{end}}' example.com/retract/self/prerelease@latest
+stdout '^v1.9.0 retracted$'
+
+# 'go list -m mod@latest' selects a pseudo-version if all versions are retracted.
+# TODO(golang.org/issue/24031): the proxy does not expose the pseudo-version,
+# even if all release versions are retracted.
+go list -m -e -f '{{.Error.Err}}' example.com/retract/self/pseudo@latest
+stdout '^module example.com/retract/self/pseudo: no matching versions for query "latest"$'
+
+# 'go list -m mod@latest' reports an error if all versions are retracted.
+go list -m -e -f '{{.Error.Err}}' example.com/retract/self/all@latest
+stdout '^module example.com/retract/self/all: no matching versions for query "latest"$'
+
+# 'go list -m mod@<v1.10' selects a previous release version, not self-retracted latest.
+# The @latest query is not special with respect to retractions.
+go list -m -f '{{.Version}}{{with .Retracted}} retracted{{end}}' example.com/retract/self/prev@<v1.10
+stdout '^v1.1.0$'
+
+# 'go list -m -versions' hides retracted versions.
+go list -m -versions example.com/retract
+stdout '^example.com/retract v1.0.0-good v1.1.0$'
+
+# 'go list -m -retracted -versions' shows retracted versions.
+go list -m -retracted -versions example.com/retract
+stdout '^example.com/retract v1.0.0-bad v1.0.0-good v1.0.0-unused v1.1.0$'
+
+# 'go list -m -u -versions' loads retractions and does not show retracted versions.
+go list -m -u -versions example.com/retract
+stdout '^example.com/retract v1.0.0-good v1.1.0$'
+go list -m -u -versions -f '{{with .Retracted}}retracted{{end}}' example.com/retract
+stdout retracted
+
+# 'go list -m -u' shows retraction.
+go list -m -u -f '{{with .Retracted}}retracted{{end}}' example.com/retract
+stdout retracted
+
+# 'go list -m -u' does not suggest an update to a self-retracted latest version.
+go list -m -u -f '{{with .Update}}{{.Version}}{{with .Retracted}} retracted{{end}}{{end}}' example.com/retract/self/prev@v1.0.0-bad
+stdout '^v1.1.0$'
+
+-- go.mod --
+module example.com/use
+
+go 1.15
+
+require example.com/retract v1.0.0-bad
+
+-- use.go --
+package use
+
+import _ "example.com/retract"
diff --git a/src/cmd/go/testdata/script/mod_list_std.txt b/src/cmd/go/testdata/script/mod_list_std.txt
new file mode 100644
index 0000000..baf7908
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_std.txt
@@ -0,0 +1,90 @@
+env GO111MODULE=on
+env GOPROXY=off
+
+[!gc] skip
+[short] skip
+
+# Outside of GOROOT, our vendored packages should be reported as part of the standard library.
+go list -f '{{if .Standard}}{{.ImportPath}}{{end}}' std cmd
+stdout ^vendor/golang\.org/x/net/http2/hpack
+stdout ^cmd/vendor/golang\.org/x/arch/x86/x86asm
+! stdout ^golang\.org/x/
+
+# The dependencies of those packages should also be vendored.
+go list -deps vendor/golang.org/x/crypto/chacha20
+stdout ^vendor/golang\.org/x/crypto/internal/subtle
+
+# cmd/... should match the same packages it used to match in GOPATH mode.
+go list cmd/...
+stdout ^cmd/compile
+! stdout ^cmd/vendor/golang\.org/x/arch/x86/x86asm
+
+# GOROOT/src/... should list the packages in std as if it were a module
+# dependency: omitting vendored dependencies and stopping at the 'cmd' module
+# boundary.
+
+go list $GOROOT/src/...
+stdout ^bytes$
+! stdout ^builtin$
+! stdout ^cmd/
+! stdout ^vendor/
+! stdout ^golang\.org/x/
+
+
+# Vendored dependencies should appear with their 'vendor/' paths in std (they're
+# in GOROOT/src, but not in the 'std' module following the usual module-boundary
+# rules).
+
+cd $GOROOT/src
+
+go list std
+stdout ^vendor/golang.org/x/net/http2/hpack
+! stdout ^golang\.org/x
+
+# The dependencies of packages with an explicit 'vendor/' prefix should
+# still themselves resolve to vendored packages.
+go list -deps vendor/golang.org/x/crypto/chacha20
+stdout ^vendor/golang.org/x/crypto/internal/subtle
+! stdout ^golang\.org/x
+
+# Within the std module, the dependencies of the non-vendored packages within
+# std should appear to come from modules, but they should be loaded from the
+# vendor directory (just like ordinary vendored module dependencies).
+
+go list all
+stdout ^golang.org/x/
+! stdout ^std/
+! stdout ^cmd/
+! stdout ^vendor/
+
+go list -deps -f '{{if not .Standard}}{{.ImportPath}}{{end}}' std
+! stdout ^vendor/golang.org/x/net/http2/hpack
+stdout ^golang.org/x/net/http2/hpack
+
+go list -f '{{.Dir}}' golang.org/x/net/http2/hpack
+stdout $GOROOT[/\\]src[/\\]vendor
+
+# Within the std module, the packages within the module should omit the 'std/'
+# prefix (they retain their own identities), but should respect normal module
+# boundaries (vendored packages are not included in the module, even though they
+# are included in the 'std' pattern).
+
+go list ./...
+stdout ^bytes$
+! stdout ^builtin$
+! stdout ^cmd/
+! stdout ^vendor/
+! stdout ^golang\.org/x/
+
+
+# Within std, the vendored dependencies of cmd should still appear to be part of cmd.
+
+go list -f '{{if .Standard}}{{.ImportPath}}{{end}}' cmd
+stdout ^cmd/vendor/golang\.org/x/arch/x86/x86asm
+
+go list -f '{{if not .Standard}}{{.ImportPath}}{{end}}' cmd
+! stdout .
+
+go list cmd/...
+stdout ^cmd/compile
+! stdout ^cmd/vendor/golang\.org/x/arch/x86/x86asm
diff --git a/src/cmd/go/testdata/script/mod_list_test.txt b/src/cmd/go/testdata/script/mod_list_test.txt
new file mode 100644
index 0000000..f697af6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_test.txt
@@ -0,0 +1,30 @@
+env GO111MODULE=on
+
+# go list -compiled -test must handle test-only packages
+# golang.org/issue/27097.
+go list -compiled -test
+stdout -count=4 '^.' # 4 lines
+stdout '^m$'
+stdout '^m\.test$'
+stdout '^m \[m\.test\]$'
+stdout '^m_test \[m\.test\]$'
+
+# https://golang.org/issue/39974: test packages should have the Module field populated.
+go list -test -f '{{.ImportPath}}{{with .Module}}: {{.Path}}{{end}}'
+stdout -count=4 '^.' # 4 lines
+stdout '^m: m$'
+stdout '^m\.test: m$'
+stdout '^m \[m\.test\]: m$'
+stdout '^m_test \[m\.test\]: m$'
+
+-- go.mod --
+module m
+
+-- x_test.go --
+package x
+import "testing"
+func Test(t *testing.T) {}
+-- x_x_test.go --
+package x_test
+import "testing"
+func Test(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/mod_list_upgrade.txt b/src/cmd/go/testdata/script/mod_list_upgrade.txt
new file mode 100644
index 0000000..0cef04b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_upgrade.txt
@@ -0,0 +1,12 @@
+env GO111MODULE=on
+
+# Populate go.sum
+go list -m -mod=mod all
+
+# Check for upgrades.
+go list -m -u all
+stdout 'rsc.io/quote v1.2.0 \[v1\.5\.2\]'
+
+-- go.mod --
+module x
+require rsc.io/quote v1.2.0
diff --git a/src/cmd/go/testdata/script/mod_list_upgrade_pseudo.txt b/src/cmd/go/testdata/script/mod_list_upgrade_pseudo.txt
new file mode 100644
index 0000000..b983bec
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_list_upgrade_pseudo.txt
@@ -0,0 +1,26 @@
+env GO111MODULE=on
+
+# For this test module there are three versions:
+#   * v0.1.1-0.20190429073117-b5426c86b553
+#   * v0.1.0
+#   * v0.0.0-20190430073000-30950c05d534
+# Only v0.1.0 is tagged.
+#
+# The v0.1.1 pseudo-version is semantically higher than the latest tag.
+# The v0.0.0 pseudo-version is chronologically newer.
+
+# The latest pseudo-version is semantically higher than the latest tag.
+# 'list -u' should not suggest a lower version as an upgrade.
+
+go get -d example.com/pseudoupgrade@b5426c8
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.1.1-0.20190429073117-b5426c86b553$'
+
+go get -d example.com/pseudoupgrade@v0.0.0-20190430073000-30950c05d534
+go list -m -u all
+stdout '^example.com/pseudoupgrade v0.0.0-20190430073000-30950c05d534$'
+
+-- go.mod --
+module x
+
+go 1.12
diff --git a/src/cmd/go/testdata/script/mod_load_badchain.txt b/src/cmd/go/testdata/script/mod_load_badchain.txt
new file mode 100644
index 0000000..c0c382b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_load_badchain.txt
@@ -0,0 +1,103 @@
+[short] skip
+env GO111MODULE=on
+
+# Download everything to avoid "finding" messages in stderr later.
+cp go.mod.orig go.mod
+go mod download
+go mod download example.com@v1.0.0
+go mod download example.com/badchain/a@v1.1.0
+go mod download example.com/badchain/b@v1.1.0
+go mod download example.com/badchain/c@v1.1.0
+
+# Try to update example.com/badchain/a (and its dependencies).
+! go get -d example.com/badchain/a
+cmp stderr update-a-expected
+cmp go.mod go.mod.orig
+
+# Try to update the main module. This updates everything, including
+# modules that aren't direct requirements, so the error stack is shorter.
+! go get -d -u ./...
+cmp stderr update-main-expected
+cmp go.mod go.mod.orig
+
+# Update manually. Listing modules should produce an error.
+go mod edit -require=example.com/badchain/a@v1.1.0
+! go list -m
+cmp stderr list-expected
+
+# Try listing a package that imports a package
+# in a module without a requirement.
+go mod edit -droprequire example.com/badchain/a
+! go list -mod=mod m/use
+cmp stderr list-missing-expected
+
+! go list -mod=mod -test m/testuse
+cmp stderr list-missing-test-expected
+
+-- go.mod.orig --
+module m
+
+go 1.13
+
+require example.com/badchain/a v1.0.0
+-- go.sum --
+example.com/badchain/a v1.0.0 h1:iJDLiHLmpQgr9Zrv+44UqywAE2IG6WkHnH4uG08vf+s=
+example.com/badchain/a v1.0.0/go.mod h1:6/gnCYHdVrs6mUgatUYUSbuHxEY+/yWedmTggLz23EI=
+example.com/badchain/a v1.1.0 h1:cPxQpsOjaIrn05yDfl4dFFgGSbjYmytLqtIIBfTsEqA=
+example.com/badchain/a v1.1.0/go.mod h1:T15b2BEK+RY7h7Lr2dgS38p1pgH5/t7Kf5nQXBlcW/A=
+example.com/badchain/b v1.0.0 h1:kjDVlBxpjQavYxHE7ECCyyXhfwsfhWIqvghfRgPktSA=
+example.com/badchain/b v1.0.0/go.mod h1:sYsH934pMc3/A2vQZh019qrWmp4+k87l3O0VFUYqL+I=
+example.com/badchain/b v1.1.0 h1:iEALV+DRN62FArnYylBR4YwCALn/hCdITvhdagHa0L4=
+example.com/badchain/b v1.1.0/go.mod h1:mlCgKO7lRZ+ijwMFIBFRPCGt5r5oqCcHdhSSE0VL4uY=
+example.com/badchain/c v1.0.0 h1:lOeUHQKR7SboSH7Bj6eIDWoNHaDQXI0T2GfaH2x9fNA=
+example.com/badchain/c v1.0.0/go.mod h1:4U3gzno17SaQ2koSVNxITu9r60CeLSgye9y4/5LnfOE=
+example.com/badchain/c v1.1.0 h1:VtTg1g7fOutWKHQf+ag04KLRpdMGSfQ9s9tagVtGW14=
+example.com/badchain/c v1.1.0/go.mod h1:tyoJj5qh+qtb48sflwdVvk4R+OjPQEY2UJOoibsVLPk=
+-- use/use.go --
+package use
+
+import _ "example.com/badchain/c"
+-- testuse/testuse.go --
+package testuse
+-- testuse/testuse_test.go --
+package testuse
+
+import (
+	"testing"
+	_ "example.com/badchain/c"
+)
+
+func Test(t *testing.T) {}
+-- update-main-expected --
+go get: example.com/badchain/c@v1.0.0 updating to
+	example.com/badchain/c@v1.1.0: parsing go.mod:
+	module declares its path as: badchain.example.com/c
+	        but was required as: example.com/badchain/c
+-- update-a-expected --
+go get: example.com/badchain/a@v1.0.0 updating to
+	example.com/badchain/a@v1.1.0 requires
+	example.com/badchain/b@v1.1.0 requires
+	example.com/badchain/c@v1.1.0: parsing go.mod:
+	module declares its path as: badchain.example.com/c
+	        but was required as: example.com/badchain/c
+-- list-expected --
+go: example.com/badchain/a@v1.1.0 requires
+	example.com/badchain/b@v1.1.0 requires
+	example.com/badchain/c@v1.1.0: parsing go.mod:
+	module declares its path as: badchain.example.com/c
+	        but was required as: example.com/badchain/c
+-- list-missing-expected --
+go: finding module for package example.com/badchain/c
+go: found example.com/badchain/c in example.com/badchain/c v1.1.0
+go: m/use imports
+	example.com/badchain/c: example.com/badchain/c@v1.1.0: parsing go.mod:
+	module declares its path as: badchain.example.com/c
+	        but was required as: example.com/badchain/c
+-- list-missing-test-expected --
+go: finding module for package example.com/badchain/c
+go: found example.com/badchain/c in example.com/badchain/c v1.1.0
+go: m/testuse tested by
+	m/testuse.test imports
+	example.com/badchain/c: example.com/badchain/c@v1.1.0: parsing go.mod:
+	module declares its path as: badchain.example.com/c
+	        but was required as: example.com/badchain/c
diff --git a/src/cmd/go/testdata/script/mod_load_badmod.txt b/src/cmd/go/testdata/script/mod_load_badmod.txt
new file mode 100644
index 0000000..fa22e18
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_load_badmod.txt
@@ -0,0 +1,25 @@
+# Unknown lines should be ignored in dependency go.mod files.
+go list -m -mod=mod all
+
+# ... and in replaced dependency go.mod files.
+cp go.mod go.mod.usesub
+go list -m -mod=mod all
+
+# ... but not in the main module.
+cp go.mod.bad go.mod
+! go list -m -mod=mod all
+stderr 'unknown directive: hello'
+
+-- go.mod --
+module m
+require rsc.io/badmod v1.0.0
+-- go.mod.bad --
+module m
+hello world
+-- go.mod.usesub --
+module m
+require rsc.io/badmod v1.0.0
+replace rsc.io/badmod v1.0.0 => ./sub
+-- sub/go.mod --
+module sub
+hello world
diff --git a/src/cmd/go/testdata/script/mod_load_badzip.txt b/src/cmd/go/testdata/script/mod_load_badzip.txt
new file mode 100644
index 0000000..65374d2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_load_badzip.txt
@@ -0,0 +1,13 @@
+# Zip files with unexpected file names inside should be rejected.
+env GO111MODULE=on
+
+! go get -d rsc.io/badzip
+stderr 'zip for rsc.io/badzip@v1.0.0 has unexpected file rsc.io/badzip@v1.0.0.txt'
+! grep rsc.io/badzip go.mod
+
+go mod edit -require rsc.io/badzip@v1.0.0
+! go build -mod=mod rsc.io/badzip
+stderr 'zip for rsc.io/badzip@v1.0.0 has unexpected file rsc.io/badzip@v1.0.0.txt'
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_load_replace_mismatch.txt b/src/cmd/go/testdata/script/mod_load_replace_mismatch.txt
new file mode 100644
index 0000000..2ca8b3c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_load_replace_mismatch.txt
@@ -0,0 +1,23 @@
+# If a replacement module declares a module path different from both
+# the original module and its location, report an error with all three paths.
+# In particular, the "required as" path should be the original.
+# Verifies golang.org/issue/38220.
+! go mod download
+cmp stderr want
+
+-- go.mod --
+module m
+
+require rsc.io/quote v1.5.2
+
+replace rsc.io/quote v1.5.2 => example.com/quote v1.5.2
+
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+
+-- want --
+go: rsc.io/quote@v1.5.2 (replaced by example.com/quote@v1.5.2): parsing go.mod:
+	module declares its path as: rsc.io/Quote
+	        but was required as: rsc.io/quote
diff --git a/src/cmd/go/testdata/script/mod_local_replace.txt b/src/cmd/go/testdata/script/mod_local_replace.txt
new file mode 100644
index 0000000..19bc8f3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_local_replace.txt
@@ -0,0 +1,23 @@
+# Test that local replacements work even with dummy module names.
+# golang.org/issue/24100.
+
+env GO111MODULE=on
+
+cd x/y
+go list -f '{{.Dir}}' zz
+stdout x[/\\]z$
+
+-- x/y/go.mod --
+module x/y
+require zz v1.0.0
+replace zz v1.0.0 => ../z
+
+-- x/y/y.go --
+package y
+import _ "zz"
+
+-- x/z/go.mod --
+module x/z
+
+-- x/z/z.go --
+package z
diff --git a/src/cmd/go/testdata/script/mod_missing_repo.txt b/src/cmd/go/testdata/script/mod_missing_repo.txt
new file mode 100644
index 0000000..8dae85f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_missing_repo.txt
@@ -0,0 +1,15 @@
+# Regression test for golang.org/issue/34094: modules hosted within gitlab.com
+# subgroups could not be fetched because the server returned bogus go-import
+# tags for prefixes of the module path.
+
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+! go get -d vcs-test.golang.org/go/missingrepo/missingrepo-git
+stderr 'vcs-test.golang.org/go/missingrepo/missingrepo-git: git ls-remote .*: exit status .*'
+
+go get -d vcs-test.golang.org/go/missingrepo/missingrepo-git/notmissing
diff --git a/src/cmd/go/testdata/script/mod_missingpkg_prerelease.txt b/src/cmd/go/testdata/script/mod_missingpkg_prerelease.txt
new file mode 100644
index 0000000..9c250e7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_missingpkg_prerelease.txt
@@ -0,0 +1,17 @@
+env GO111MODULE=on
+
+! go list -mod=mod -deps use.go
+stderr '^use.go:4:2: package example.com/missingpkg/deprecated provided by example.com/missingpkg at latest version v1.0.0 but not at required version v1.0.1-beta$'
+
+-- go.mod --
+module m
+
+go 1.14
+
+-- use.go --
+package use
+
+import (
+	_ "example.com/missingpkg/deprecated"
+	_ "example.com/usemissingpre"
+)
diff --git a/src/cmd/go/testdata/script/mod_modinfo.txt b/src/cmd/go/testdata/script/mod_modinfo.txt
new file mode 100644
index 0000000..8d77e22
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_modinfo.txt
@@ -0,0 +1,89 @@
+# Test to ensure runtime/debug.ReadBuildInfo parses
+# the modinfo embedded in a binary by the go tool
+# when module is enabled.
+env GO111MODULE=on
+
+cd x
+go mod edit -require=rsc.io/quote@v1.5.2
+go mod edit -replace=rsc.io/quote@v1.5.2=rsc.io/quote@v1.0.0
+go mod tidy # populate go.sum
+
+# Build a binary and ensure that it can output its own debug info.
+# The debug info should be accessible before main starts (golang.org/issue/29628).
+go build
+exec ./x$GOEXE
+stderr 'mod\s+x\s+\(devel\)'
+stderr 'dep\s+rsc.io/quote\s+v1.5.2\s+'
+stderr '=>\s+rsc.io/quote\s+v1.0.0\s+h1:'
+stderr 'Hello, world.'
+
+[short] skip
+
+# Build a binary that accesses its debug info by reading the binary directly
+# (rather than through debug.ReadBuildInfo).
+# The debug info should still be present (golang.org/issue/28753).
+cd unused
+go build
+exec ./unused$GOEXE
+
+-- x/go.mod --
+module x
+
+-- x/lib/lib.go --
+// Package lib accesses runtime/debug.modinfo before package main's init
+// functions have run.
+package lib
+
+import "runtime/debug"
+
+func init() {
+	m, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("failed debug.ReadBuildInfo")
+	}
+	println("mod", m.Main.Path, m.Main.Version)
+	for _, d := range m.Deps {
+		println("dep", d.Path, d.Version, d.Sum)
+		if r := d.Replace; r != nil {
+			println("=>", r.Path, r.Version, r.Sum)
+		}
+	}
+}
+
+-- x/main.go --
+package main
+
+import (
+	"rsc.io/quote"
+	_ "x/lib"
+)
+
+func main() {
+	println(quote.Hello())
+}
+
+-- x/unused/main.go --
+// The unused binary does not access runtime/debug.modinfo.
+package main
+
+import (
+	"bytes"
+	"encoding/hex"
+	"log"
+	"os"
+
+	_ "rsc.io/quote"
+)
+
+func main() {
+	b, err := os.ReadFile(os.Args[0])
+	if err != nil {
+		log.Fatal(err)
+	}
+
+	infoStart, _ := hex.DecodeString("3077af0c9274080241e1c107e6d618e6")
+	if !bytes.Contains(b, infoStart) {
+		log.Fatal("infoStart not found in binary")
+	}
+	log.Println("ok")
+}
diff --git a/src/cmd/go/testdata/script/mod_multirepo.txt b/src/cmd/go/testdata/script/mod_multirepo.txt
new file mode 100644
index 0000000..0f335a1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_multirepo.txt
@@ -0,0 +1,41 @@
+env GO111MODULE=on
+
+# initial standalone module should use no downloaded modules
+go list -deps -f {{.Dir}}
+! stdout 'pkg[\\/]mod'
+
+# v2 import should use a downloaded module
+# both without an explicit go.mod entry ...
+cp tmp/use_v2.go x.go
+go get -d .
+go list -deps -f {{.Dir}}
+stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/]v2@v2.0.1$'
+
+# ... and with one ...
+cp tmp/use_v2.mod go.mod
+go list -deps -f {{.Dir}}
+stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/]v2@v2.0.1$'
+
+# ... and even if there is a v2 module in a subdirectory.
+mkdir v2
+cp x.go v2/x.go
+cp tmp/v2.mod v2/go.mod
+go list -deps -f {{.Dir}}
+stdout 'pkg[\\/]mod[\\/]rsc.io[\\/]quote[\\/]v2@v2.0.1$'
+
+-- go.mod --
+module rsc.io/quote
+
+-- x.go --
+package quote
+
+-- tmp/use_v2.go --
+package quote
+import _ "rsc.io/quote/v2"
+
+-- tmp/use_v2.mod --
+module rsc.io/quote
+require rsc.io/quote/v2 v2.0.1
+
+-- tmp/v2.mod --
+package rsc.io/quote/v2
diff --git a/src/cmd/go/testdata/script/mod_nomod.txt b/src/cmd/go/testdata/script/mod_nomod.txt
new file mode 100644
index 0000000..7e0f55a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_nomod.txt
@@ -0,0 +1,43 @@
+# Test go commands with no module.
+env GO111MODULE=on
+
+# go mod edit fails unless given explicit mod file argument
+! go mod edit -json
+go mod edit -json x.mod
+
+# bug succeeds
+[exec:echo] env BROWSER=echo
+[exec:echo] go bug
+
+# commands that load the package in the current directory fail
+! go build
+! go fmt
+! go generate
+! go get
+! go install
+! go list
+! go run
+! go test
+! go vet
+
+# clean succeeds, even with -modcache
+go clean -modcache
+
+# doc succeeds for standard library
+go doc unsafe
+
+# env succeeds
+go env
+
+# tool succeeds
+go tool -n test2json
+
+# version succeeds
+go version
+
+-- x.mod --
+module m
+
+-- x.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_notall.txt b/src/cmd/go/testdata/script/mod_notall.txt
new file mode 100644
index 0000000..1657c8d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_notall.txt
@@ -0,0 +1,99 @@
+# This test demonstrates go commands that combine the 'all' pattern
+# with packages outside of 'all'.
+
+# With -deps, 'all' should include test dependencies of packages in the main
+# module, but not should not include test dependencies of packages imported only
+# by other root patterns.
+
+env GOFLAGS=-mod=mod
+cp go.mod go.mod.orig
+
+go list -deps all x/otherroot
+
+stdout '^x/inall$'
+stdout '^x/inall/fromtest$'
+stdout '^x/inall/fromtestinall$'
+stdout '^x/otherroot$'
+stdout '^x/otherdep$'
+
+! stdout '^x/fromotherroottest$'
+! stdout '^y/fromotherdeptest$'
+
+cmp go.mod go.mod.orig
+
+# With -deps -test, test dependencies of other roots should be included,
+# but test dependencies of non-roots should not.
+
+go list -deps -test all x/otherroot
+stdout '^x/inall$'
+stdout '^x/inall/fromtest$'
+stdout '^x/inall/fromtestinall$'
+stdout '^x/otherroot$'
+stdout '^x/otherdep$'
+
+stdout '^x/fromotherroottest$'
+! stdout '^y/fromotherdeptest$'
+
+cmp go.mod go.mod.orig
+
+-- m.go --
+package m
+
+import _ "x/inall"
+-- m_test.go --
+package m_test
+
+import _ "x/inall/fromtest"
+-- go.mod --
+module m
+
+go 1.15
+
+require x v0.1.0
+
+replace (
+	x v0.1.0 => ./x
+	y v0.1.0 => ./y
+)
+-- x/go.mod --
+module x
+
+go 1.15
+-- x/inall/inall.go --
+package inall
+-- x/inall/inall_test.go --
+package inall_test
+
+import _ "x/inall/fromtestinall"
+-- x/inall/fromtest/fromtest.go --
+package fromtest
+-- x/inall/fromtestinall/fromtestinall.go --
+package fromtestinall
+-- x/otherroot/otherroot.go --
+package otherroot
+
+import _ "x/otherdep"
+-- x/otherroot/otherroot_test.go --
+package otherroot_test
+
+import _ "x/fromotherroottest"
+-- x/fromotherroottest/fromotherroottest.go --
+package fromotherroottest
+-- x/otherdep/otherdep.go --
+package otherdep
+-- x/otherdep/otherdep_test.go --
+package otherdep_test
+
+import _ "y/fromotherdeptest"
+-- x/otherroot/testonly/testonly.go --
+package testonly
+-- y/go.mod --
+module y
+
+go 1.15
+-- y/fromotherdeptest/fromotherdeptest.go --
+// Package fromotherdeptest is a test dependency of x/otherdep that is
+// not declared in x/go.mod. If the loader resolves this package,
+// it will add this module to the main module's go.mod file,
+// and we can detect the mistake.
+package fromotherdeptest
diff --git a/src/cmd/go/testdata/script/mod_off.txt b/src/cmd/go/testdata/script/mod_off.txt
new file mode 100644
index 0000000..a73a58d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_off.txt
@@ -0,0 +1,35 @@
+env GO111MODULE=off
+
+# This script tests that running go mod with
+# GO111MODULE=off when outside of GOPATH will fatal
+# with an error message, even with some source code in the directory and a go.mod.
+! go mod init
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod graph
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod verify
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod download
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+
+# Same result in an empty directory
+mkdir z
+cd z
+! go mod init
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod graph
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod verify
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+! go mod download
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
+
+-- sample.go --
+package sample
+
+func main() {}
+
+-- go.mod --
+module sample
+
+go 1.12
diff --git a/src/cmd/go/testdata/script/mod_off_init.txt b/src/cmd/go/testdata/script/mod_off_init.txt
new file mode 100644
index 0000000..2aec0b3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_off_init.txt
@@ -0,0 +1,5 @@
+# 'go mod init' should refuse to initialize a module if it will be
+# ignored anyway due to GO111MODULE=off.
+env GO111MODULE=off
+! go mod init
+stderr 'go: modules disabled by GO111MODULE=off; see ''go help modules'''
diff --git a/src/cmd/go/testdata/script/mod_outside.txt b/src/cmd/go/testdata/script/mod_outside.txt
new file mode 100644
index 0000000..5655892
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_outside.txt
@@ -0,0 +1,328 @@
+env GO111MODULE=on
+[short] skip
+
+# This script tests commands in module mode outside of any module.
+#
+# First, ensure that we really are in module mode, and that we really don't have
+# a go.mod file.
+go env GOMOD
+stdout 'NUL|/dev/null'
+
+
+# 'go list' without arguments implicitly operates on the current directory,
+# which is not in a module.
+! go list
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+go list -m
+stdout '^command-line-arguments$'
+# 'go list' in the working directory should fail even if there is a a 'package
+# main' present: without a main module, we do not know its package path.
+! go list ./needmod
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go list all' lists the transitive import graph of the main module,
+# which is empty if there is no main module.
+go list all
+! stdout .
+stderr 'warning: "all" matched no packages'
+
+# 'go list' on standard-library packages should work, since they do not depend
+# on the contents of any module.
+go list -deps cmd
+stdout '^fmt$'
+stdout '^cmd/go$'
+
+go list $GOROOT/src/fmt
+stdout '^fmt$'
+
+# 'go list' should work with file arguments.
+go list ./needmod/needmod.go
+stdout 'command-line-arguments'
+
+# 'go list' on a package from a module should fail.
+! go list example.com/printversion
+stderr '^no required module provides package example.com/printversion: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go list -m' with an explicit version should resolve that version.
+go list -m example.com/version@latest
+stdout 'example.com/version v1.1.0'
+
+# 'go list -m -versions' should succeed even without an explicit version.
+go list -m -versions example.com/version
+stdout 'v1.0.0\s+v1.0.1\s+v1.1.0'
+
+# 'go list -m all' should fail. "all" is not meaningful outside of a module.
+! go list -m all
+stderr 'go: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go list -m <mods> all' should also fail.
+! go list -m example.com/printversion@v1.0.0 all
+stderr 'go: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! stdout 'example.com/version'
+
+# 'go list -m' with wildcards should fail. Wildcards match modules in the
+# build list, so they aren't meaningful outside a module.
+! go list -m ...
+stderr 'go: cannot match "...": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go list -m rsc.io/quote/...
+stderr 'go: cannot match "rsc.io/quote/...": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go clean' should skip the current directory if it isn't in a module.
+go clean -n
+! stdout .
+! stderr .
+
+# 'go mod graph' should fail, since there's no module graph.
+! go mod graph
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go mod why' should fail, since there is no main module to depend on anything.
+! go mod why -m example.com/version
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go mod edit', 'go mod tidy', and 'go mod fmt' should fail:
+# there is no go.mod file to edit.
+! go mod tidy
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go mod edit -fmt
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go mod edit -require example.com/version@v1.0.0
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go mod download' without arguments should report an error.
+! go mod download
+stderr 'no modules specified'
+
+# 'go mod download' should download exactly the requested module without dependencies.
+rm -r $GOPATH/pkg/mod/cache/download/example.com
+go mod download example.com/printversion@v1.0.0
+exists $GOPATH/pkg/mod/cache/download/example.com/printversion/@v/v1.0.0.zip
+! exists $GOPATH/pkg/mod/cache/download/example.com/version/@v/v1.0.0.zip
+
+# 'go mod download all' should fail. "all" is not meaningful outside of a module.
+! go mod download all
+stderr 'go: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go mod vendor' should fail: it starts by clearing the existing vendor
+# directory, and we don't know where that is.
+! go mod vendor
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go mod verify' should fail: we have no modules to verify.
+! go mod verify
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go get' without arguments implicitly operates on the main module, and thus
+# should fail.
+! go get
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go get -u
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+! go get -u ./needmod
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go get -u all' upgrades the transitive import graph of the main module,
+# which is empty.
+! go get -u all
+stderr '^go get: cannot match "all": go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go get' should check the proposed module graph for consistency,
+# even though we won't write it anywhere.
+! go get -d example.com/printversion@v1.0.0 example.com/version@none
+stderr '^go get: example.com/printversion@v1.0.0 requires example.com/version@v1.0.0, not example.com/version@none$'
+
+# 'go get -d' should download and extract the source code needed to build the requested version.
+rm -r $GOPATH/pkg/mod/example.com
+go get -d example.com/printversion@v1.0.0
+exists $GOPATH/pkg/mod/example.com/printversion@v1.0.0
+exists $GOPATH/pkg/mod/example.com/version@v1.0.0
+
+
+# 'go build' without arguments implicitly operates on the current directory, and should fail.
+cd needmod
+! go build
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+cd ..
+
+# 'go build' of a non-module directory should fail too.
+! go build ./needmod
+stderr '^go: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go build' of source files should fail if they import anything outside std.
+! go build -n ./needmod/needmod.go
+stderr '^needmod[/\\]needmod.go:10:2: no required module provides package example.com/version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go build' of source files should succeed if they do not import anything outside std.
+go build -n -o ignore ./stdonly/stdonly.go
+
+# 'go build' should succeed for standard-library packages.
+go build -n fmt
+
+
+# 'go doc' without arguments implicitly operates on the current directory, and should fail.
+# TODO(golang.org/issue/32027): currently, it succeeds.
+cd needmod
+go doc
+cd ..
+
+# 'go doc' of a non-module directory should also succeed.
+go doc ./needmod
+
+# 'go doc' should succeed for standard-library packages.
+go doc fmt
+
+# 'go doc' should fail for a package path outside a module.
+! go doc example.com/version
+stderr 'doc: no required module provides package example.com/version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go install' with a version should succeed if all constraints are met.
+# See mod_install_pkg_version.
+rm $GOPATH/bin
+go install example.com/printversion@v0.1.0
+exists $GOPATH/bin/printversion$GOEXE
+
+# 'go install' should fail if a package argument must be resolved to a module.
+! go install example.com/printversion
+stderr '^go install: version is required when current directory is not in a module\n\tTry ''go install example.com/printversion@latest'' to install the latest version$'
+
+# 'go install' should fail if a source file imports a package that must be
+# resolved to a module.
+! go install ./needmod/needmod.go
+stderr 'needmod[/\\]needmod.go:10:2: no required module provides package example.com/version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go install' should succeed with a package in GOROOT.
+go install cmd/addr2line
+! stderr .
+
+# 'go run' with a verison should fail due to syntax.
+! go run example.com/printversion@v1.0.0
+stderr 'can only use path@version syntax with'
+
+# 'go run' should fail if a package argument must be resolved to a module.
+! go run example.com/printversion
+stderr '^no required module provides package example.com/printversion: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+# 'go run' should fail if a source file imports a package that must be
+# resolved to a module.
+! go run ./needmod/needmod.go
+stderr '^needmod[/\\]needmod.go:10:2: no required module provides package example.com/version: go.mod file not found in current directory or any parent directory; see ''go help modules''$'
+
+
+# 'go fmt' should be able to format files outside of a module.
+go fmt needmod/needmod.go
+
+
+# The remainder of the test checks dependencies by linking and running binaries.
+
+# 'go get' of a binary without a go.mod should install the requested version,
+# resolving outside dependencies to the latest available versions.
+go get example.com/printversion@v0.1.0
+exec ../bin/printversion
+stdout 'path is example.com/printversion'
+stdout 'main is example.com/printversion v0.1.0'
+stdout 'using example.com/version v1.1.0'
+
+# 'go get' of a versioned binary should build and install the latest version
+# using its minimal required modules, ignoring replacements and exclusions.
+go get example.com/printversion
+exec ../bin/printversion
+stdout 'path is example.com/printversion'
+stdout 'main is example.com/printversion v1.0.0'
+stdout 'using example.com/version v1.0.0'
+
+# 'go get -u=patch' should patch dependencies before installing,
+# again ignoring replacements and exclusions.
+go get -u=patch example.com/printversion@v1.0.0
+exec ../bin/printversion
+stdout 'path is example.com/printversion'
+stdout 'main is example.com/printversion v1.0.0'
+stdout 'using example.com/version v1.0.1'
+
+# 'go run' should work with file arguments if they don't import anything
+# outside std.
+go run ./stdonly/stdonly.go
+stdout 'path is command-line-arguments$'
+stdout 'main is command-line-arguments \(devel\)'
+
+# 'go generate' should work with file arguments.
+[exec:touch] go generate ./needmod/needmod.go
+[exec:touch] exists ./needmod/gen.txt
+
+# 'go install' should work with file arguments.
+go install ./stdonly/stdonly.go
+
+# 'go test' should work with file arguments.
+go test -v ./stdonly/stdonly_test.go
+stdout 'stdonly was tested'
+
+# 'go vet' should work with file arguments.
+go vet ./stdonly/stdonly.go
+
+
+-- README.txt --
+There is no go.mod file in the working directory.
+
+-- needmod/needmod.go --
+//go:generate touch gen.txt
+
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+
+	_ "example.com/version"
+)
+
+func main() {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("missing build info")
+	}
+	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
+	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
+	for _, m := range info.Deps {
+		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
+	}
+}
+
+-- stdonly/stdonly.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+)
+
+func main() {
+	info, ok := debug.ReadBuildInfo()
+	if !ok {
+		panic("missing build info")
+	}
+	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
+	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
+	for _, m := range info.Deps {
+		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
+	}
+}
+
+-- stdonly/stdonly_test.go --
+package main
+
+import (
+	"fmt"
+	"testing"
+)
+
+func Test(t *testing.T) {
+	fmt.Println("stdonly was tested")
+}
+
diff --git a/src/cmd/go/testdata/script/mod_overlay.txt b/src/cmd/go/testdata/script/mod_overlay.txt
new file mode 100644
index 0000000..92e79c7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_overlay.txt
@@ -0,0 +1,254 @@
+# Test overlays that affect go.mod files
+
+# The go.mod file can exist only in the overlay.
+cd $WORK/gopath/src/no-go-mod
+go list -overlay overlay.json .
+stdout example.com/simple
+
+# Check content of overlaid go.mod is used.
+cd $WORK/gopath/src/overlay-go-mod
+go list -overlay overlay.json .
+stdout use.this/module/name
+
+# Check content of overlaid go.mod in a replacement module is used.
+# The go.mod in the replacement module is missing a requirement
+# that the overlay has, so it will fail to list without the overlay.
+cd $WORK/gopath/src/overlay-replaced-go-mod
+! go list -deps .
+go list -deps -overlay overlay.json .
+
+# Overlaid go.mod is not rewritten by 'go get'.
+cd $WORK/gopath/src/get-doesnt-add-dep
+cp $WORK/overlay/get_doesnt_add_dep_go_mod $WORK/want_go_mod
+! go get -d -overlay overlay.json .
+stderr 'overlaid files can''t be opened for write'
+cmp $WORK/overlay/get_doesnt_add_dep_go_mod $WORK/want_go_mod
+
+# Content of overlaid go.sum is used.
+# The go.sum in the module directory has garbage values for its
+# hashes, but the overlaid file has the correct values. If
+# the correct go.sum is used with the overlay, 'go get .' should
+# not report a security error.
+cd $WORK/gopath/src/overlay-sum-used
+! go get -d .
+stderr 'SECURITY ERROR'
+! go mod verify
+stderr 'SECURITY ERROR'
+go get -d -overlay overlay.json .
+go mod verify -overlay overlay.json
+# Overlaid go.sum is not rewritten.
+# Copy an incomplete file to the overlay file, and expect an error
+# attempting to update the file
+cp incomplete-sum-file $WORK/overlay/overlay-sum-used-correct-sums
+! go get -d -overlay overlay.json .
+stderr 'overlaid files can''t be opened for write'
+cmp incomplete-sum-file $WORK/overlay/overlay-sum-used-correct-sums
+! go mod tidy -overlay overlay.json
+stderr 'overlaid files can''t be opened for write'
+cmp incomplete-sum-file $WORK/overlay/overlay-sum-used-correct-sums
+
+# -overlay works with -modfile.
+# There's an empty go.mod file in the directory, and the file alternate.mod is
+# overlaid to the true go.mod file, so the -modfile flag and the overlay
+# mechanism need to work together to determine the name of the module.
+cd $WORK/gopath/src/overlay-and-dash-modfile
+go list -modfile=alternate.mod -overlay overlay.json .
+stdout 'found.the/module'
+# Even with -modfile, overlaid files can't be opened for write.
+! go get -modfile=alternate.mod -overlay overlay.json -d rsc.io/quote
+stderr 'overlaid files can''t be opened for write'
+
+# Carving out a module by adding an overlaid go.mod file
+cd $WORK/gopath/src/carve
+go list ./... # without an overlay, hasmod is carved out and nomod isn't
+stdout carve/nomod
+! stdout carve/hasmod
+go list -overlay overlay_carve_module.json ./... # The overlay carves out nomod, leaving nothing
+! stdout .
+stderr 'matched no packages'
+go list -overlay overlay_uncarve_module.json ./... # The overlay uncarves out hasmod
+stdout carve/nomod
+stdout carve/hasmod
+
+# Carving out a module by adding an overlaid go.mod file and using
+# -modfile to write to that file.
+cd $WORK/gopath/src/carve2/nomod
+go list -overlay overlay.json all
+! stdout ^carve2$
+stdout ^carve2/nomod$
+# Editing go.mod file fails because overlay is read only
+! go get -overlay overlay.json -d rsc.io/quote
+stderr 'overlaid files can''t be opened for write'
+! grep rsc.io/quote $WORK/overlay/carve2-nomod-go.mod
+# Editing go.mod file succeeds because we use -modfile to redirect to same file
+go get -overlay overlay.json -modfile $WORK/overlay/carve2-nomod-go.mod -d rsc.io/quote
+grep rsc.io/quote $WORK/overlay/carve2-nomod-go.mod
+
+-- no-go-mod/file.go --
+package simple
+-- no-go-mod/overlay.json --
+{
+	"Replace": {
+		"go.mod": "../../../overlay/simple_go_mod"
+	}
+}
+-- $WORK/overlay/simple_go_mod --
+module example.com/simple
+-- overlay-go-mod/file.go --
+package name
+-- overlay-go-mod/go.mod --
+module dont.use/this/module/name
+-- overlay-go-mod/overlay.json --
+{
+	"Replace": {
+		"go.mod": "../../../overlay/use_this_go_mod"
+	}
+}
+-- $WORK/overlay/use_this_go_mod --
+module use.this/module/name
+-- overlay-replaced-go-mod/go.mod --
+module m
+
+go 1.15
+
+require replaced/mod v1.0.0
+replace replaced/mod v1.0.0 => ../replaced-mod
+replace dep/mod v1.0.0 => ../dep-mod
+-- overlay-replaced-go-mod/source.go --
+package m
+
+import "replaced/mod/foo"
+
+func main() {
+	foo.f()
+}
+-- overlay-replaced-go-mod/overlay.json --
+{
+	"Replace": {
+		"../replaced-mod/go.mod": "../../../overlay/replacement_module_go_mod"
+	}
+}
+-- replaced-mod/go.mod --
+module replaced/mod
+-- replaced-mod/foo/foo.go --
+package foo
+
+import "dep/mod/foo"
+
+func f() { foo.g() }
+-- dep-mod/go.mod --
+invalid
+-- dep-mod/foo/foo.go --
+package foo
+
+func g() { fmt.Println("hello") }
+-- $WORK/overlay/replacement_module_go_mod --
+module replaced/mod
+
+require dep/mod v1.0.0
+
+-- get-doesnt-add-dep/overlay.json --
+{
+	"Replace": {
+		"go.mod": "../../../overlay/get_doesnt_add_dep_go_mod"
+	}
+}
+-- get-doesnt-add-dep/p.go --
+package p
+
+import "dependency/mod"
+
+func f() { mod.G() }
+-- get-doesnt-add-dep-dependency/go.mod --
+module dependency/mod
+-- get-doesnt-add-dep-dependency/mod.go --
+package mod
+
+func G() {}
+-- $WORK/overlay/get_doesnt_add_dep_go_mod --
+module get.doesnt/add/dep
+
+replace dependency/mod v1.0.0 => ../get-doesnt-add-dep-dependency
+-- overlay-sum-used/go.mod --
+module overlay.sum/used
+
+require rsc.io/quote v1.5.0
+-- overlay-sum-used/p.go --
+package p
+
+import "rsc.io/quote"
+
+func f() string {
+	return quote.Hello()
+}
+-- overlay-sum-used/incomplete-sum-file --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+rsc.io/quote v1.5.0 h1:6fJa6E+wGadANKkUMlZ0DhXFpoKlslOQDCo259XtdIE=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+-- overlay-sum-used/overlay.json --
+{
+	"Replace": {
+		"go.sum": "../../../overlay/overlay-sum-used-correct-sums"
+	}
+}
+-- overlay-sum-used/go.sum --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:garbage+hash
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:garbage+hash
+rsc.io/quote v1.5.0 h1:garbage+hash
+rsc.io/quote v1.5.0/go.mod h1:garbage+hash
+rsc.io/sampler v1.3.0 h1:garbage+hash
+rsc.io/sampler v1.3.0/go.mod h1:garbage+hash
+-- $WORK/overlay/overlay-sum-used-correct-sums --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.0 h1:6fJa6E+wGadANKkUMlZ0DhXFpoKlslOQDCo259XtdIE=
+rsc.io/quote v1.5.0/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+-- overlay-and-dash-modfile/p.go --
+package module
+-- overlay-and-dash-modfile/go.mod --
+-- overlay-and-dash-modfile/overlay.json --
+{
+	"Replace": {
+		"alternate.mod": "../../../overlay/overlay-and-dash-modfile-alternate-mod"
+	}
+}
+-- $WORK/overlay/overlay-and-dash-modfile-alternate-mod --
+module found.the/module
+-- carve/go.mod --
+module carve
+-- carve/overlay_carve_module.json --
+{
+	"Replace": {
+		"nomod/go.mod": "../../../overlay/carve-nomod-go-mod"
+	}
+}
+-- carve/overlay_uncarve_module.json --
+{
+	"Replace": {
+		"hasmod/go.mod": ""
+	}
+}
+-- carve/hasmod/a.go --
+package hasmod
+-- carve/hasmod/go.mod --
+module carve/hasmod
+-- carve/nomod/b.go --
+package nomod
+-- $WORK/overlay/carve-nomod-go-mod --
+module carve/nomod
+-- carve2/go.mod --
+module carve2
+-- carve2/p.go --
+package p
+-- carve2/nomod/overlay.json --
+{
+	"Replace": {
+		"go.mod": "../../../../overlay/carve2-nomod-go.mod"
+	}
+}
+-- carve2/nomod/b.go --
+package nomod
+-- $WORK/overlay/carve2-nomod-go.mod --
+module carve2/nomod
diff --git a/src/cmd/go/testdata/script/mod_patterns.txt b/src/cmd/go/testdata/script/mod_patterns.txt
new file mode 100644
index 0000000..1b4b438
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_patterns.txt
@@ -0,0 +1,78 @@
+env GO111MODULE=on
+[short] skip
+
+cd m
+
+# 'go list all' should list all of the packages used (directly or indirectly) by
+# the packages in the main module, but no other packages from the standard
+# library or active modules.
+#
+# 'go list ...' should list packages in all active modules and the standard library.
+#
+# 'go list example.com/m/...' should list packages in all modules that begin with 'example.com/m/'.
+#
+# 'go list ./...' should list only packages in the current module, not other active modules.
+#
+# Warnings about unmatched patterns should only be printed once.
+#
+# And the go command should be able to keep track of all this!
+go list -f '{{.ImportPath}}: {{.Match}}' all ... example.com/m/... ./... ./xyz...
+stdout 'example.com/m/useunicode: \[all \.\.\. example.com/m/... ./...\]'
+stdout 'example.com/m/useunsafe: \[all \.\.\. example.com/m/... ./...\]'
+[cgo] stdout 'example.com/m/useC: \[all \.\.\. example.com/m/... ./...\]'
+[!cgo] ! stdout example.com/m/useC
+stdout 'example.com/unused/useerrors: \[\.\.\.\]' # but not "all"
+stdout 'example.com/m/nested/useencoding: \[\.\.\. example.com/m/...\]' # but NOT "all" or "./..."
+stdout '^unicode: \[all \.\.\.\]'
+stdout '^unsafe: \[all \.\.\.\]'
+stdout 'index/suffixarray: \[\.\.\.\]'
+stdout 'cmd/pprof: \[\.\.\.\]'
+
+stderr -count=1 '^go: warning: "./xyz..." matched no packages$'
+
+# 'go list ./...' should not try to resolve the main module.
+cd ../empty
+go list -deps ./...
+! stdout .
+! stderr 'finding'
+stderr -count=1 '^go: warning: "./..." matched no packages'
+
+# disabling cgo should drop useC
+[short] skip
+env CGO_ENABLED=0
+go list -f '{{.ImportPath}}: {{.Match}}' all ... example.com/m/... ./... ./xyz...
+! stdout example.com/m/useC
+
+-- m/go.mod --
+module example.com/m
+
+require example.com/unused v0.0.0 // indirect
+replace example.com/unused => ../unused
+
+require example.com/m/nested v0.0.0 // indirect
+replace example.com/m/nested => ../nested
+
+-- m/useC/useC.go --
+package useC
+import _ "C" // "C" is a pseudo-package, not an actual one
+-- m/useunicode/useunicode.go --
+package useunicode
+import _ "unicode"
+-- m/useunsafe/useunsafe.go --
+package useunsafe
+import _ "unsafe"
+
+-- unused/go.mod --
+module example.com/unused
+-- unused/useerrors/useerrors.go --
+package useerrors
+import _ "errors"
+
+-- nested/go.mod --
+module example.com/m/nested
+-- nested/useencoding/useencoding.go --
+package useencoding
+import _ "encoding"
+
+-- empty/go.mod --
+module example.com/empty
diff --git a/src/cmd/go/testdata/script/mod_patterns_vendor.txt b/src/cmd/go/testdata/script/mod_patterns_vendor.txt
new file mode 100644
index 0000000..b4dc401
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_patterns_vendor.txt
@@ -0,0 +1,28 @@
+env GO111MODULE=on
+
+go list -mod=vendor example.com/...
+stdout ^example.com/x$
+stdout ^example.com/x/y$
+! stdout ^example.com/x/vendor
+
+-- go.mod --
+module example.com/m
+
+-- vendor/modules.txt --
+# example.com/x v0.0.0
+example.com/x
+# example.com/x/y v0.1.0
+example.com/x/y
+
+-- vendor/example.com/x/go.mod --
+module example.com/x
+-- vendor/example.com/x/x.go --
+package x
+
+-- vendor/example.com/x/y/go.mod --
+module example.com/x/y
+-- vendor/example.com/x/y/y.go --
+package y
+
+-- vendor/example.com/x/vendor/z/z.go --
+package z
diff --git a/src/cmd/go/testdata/script/mod_permissions.txt b/src/cmd/go/testdata/script/mod_permissions.txt
new file mode 100644
index 0000000..2d32dcd
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_permissions.txt
@@ -0,0 +1,57 @@
+# Regression test for golang.org/issue/34634: permissions for the go.sum and
+# go.mod files should be preserved when overwriting them.
+
+env GO111MODULE=on
+[short] skip
+
+# Skip platforms that do not have Unix-style file permissions.
+[windows] skip
+[plan9] skip
+
+chmod 0640 go.mod
+chmod 0604 go.sum
+go mod edit -module=golang.org/issue/34634
+
+go get -d
+cmp go.mod go.mod.want
+cmp go.sum go.sum.want
+
+go run .
+stdout 'go.mod: 0640'
+stdout 'go.sum: 0604'
+
+-- read_perm.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	_ "rsc.io/sampler"
+)
+
+func main() {
+	for _, name := range []string{"go.mod", "go.sum"} {
+		fi, err := os.Stat(name)
+		if err != nil {
+			fmt.Fprintf(os.Stderr, "%s: %v\n", err)
+			continue
+		}
+		fmt.Printf("%s: 0%o\n", name, fi.Mode().Perm())
+	}
+}
+-- go.mod --
+module TODO
+
+go 1.14
+-- go.sum --
+-- go.mod.want --
+module golang.org/issue/34634
+
+go 1.14
+
+require rsc.io/sampler v1.99.99
+-- go.sum.want --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/sampler v1.99.99 h1:iMG9lbEG/8MdeR4lgL+Q8IcwbLNw7ijW7fTiK8Miqts=
+rsc.io/sampler v1.99.99/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
diff --git a/src/cmd/go/testdata/script/mod_prefer_compatible.txt b/src/cmd/go/testdata/script/mod_prefer_compatible.txt
new file mode 100644
index 0000000..aa6260f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_prefer_compatible.txt
@@ -0,0 +1,65 @@
+# Regression test for golang.org/issue/34189 and golang.org/issue/34165:
+# @latest, @upgrade, and @patch should prefer compatible versions over
+# +incompatible ones, even if offered by a proxy.
+
+[!net] skip
+
+env GO111MODULE=on
+env GOPROXY=
+env GOSUMDB=
+
+# github.com/russross/blackfriday v2.0.0+incompatible exists,
+# and should be resolved if we ask for v2.0 explicitly.
+
+go list -m github.com/russross/blackfriday@v2.0
+stdout '^github.com/russross/blackfriday v2\.0\.0\+incompatible$'
+
+# blackfriday v1.5.2 has a go.mod file, so v1.5.2 should be preferred over
+# v2.0.0+incompatible when resolving latest, upgrade, and patch.
+
+go list -m github.com/russross/blackfriday@latest
+stdout '^github.com/russross/blackfriday v1\.'
+
+go list -m github.com/russross/blackfriday@upgrade
+stdout '^github.com/russross/blackfriday v1\.'
+
+go list -m github.com/russross/blackfriday@patch
+stdout '^github.com/russross/blackfriday v1\.'
+
+# If we're fetching directly from version control, ignored +incompatible
+# versions should also be omitted by 'go list'.
+
+# (Note that they may still be included in results from a proxy: in proxy mode,
+# we would need to fetch the whole zipfile for the latest compatible version in
+# order to determine whether it contains a go.mod file, and part of the point of
+# the proxy is to avoid fetching unnecessary data.)
+
+[!exec:git] stop
+env GOPROXY=direct
+
+go list -versions -m github.com/russross/blackfriday github.com/russross/blackfriday
+stdout '^github.com/russross/blackfriday v1\.5\.1 v1\.5\.2' # and possibly others
+! stdout ' v2\.'
+
+# However, if the latest compatible version does not include a go.mod file,
+# +incompatible versions should still be listed, as they may still reflect the
+# intent of the module author.
+
+go list -versions -m github.com/rsc/legacytest
+stdout '^github.com/rsc/legacytest v1\.0\.0 v1\.1\.0-pre v1\.2\.0 v2\.0\.0\+incompatible'
+
+# If we're fetching directly from version control, asking for a commit hash
+# corresponding to a +incompatible version should continue to produce the
+# +incompatible version tagged for that commit, even if it is no longer listed.
+
+go list -m github.com/russross/blackfriday@cadec560ec52
+stdout '^github.com/russross/blackfriday v2\.0\.0\+incompatible$'
+
+# Similarly, requesting an untagged commit should continue to produce a +incompatible
+# pseudo-version.
+
+go list -m github.com/rsc/legacytest@7303f7796364
+stdout '^github.com/rsc/legacytest v2\.0\.1-0\.20180717164253-7303f7796364\+incompatible$'
+
+-- go.mod --
+module github.com/golang.org/issue/34165
diff --git a/src/cmd/go/testdata/script/mod_proxy_errors.txt b/src/cmd/go/testdata/script/mod_proxy_errors.txt
new file mode 100644
index 0000000..9cd1a82
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_proxy_errors.txt
@@ -0,0 +1,19 @@
+[!net] skip
+
+env GO111MODULE=on
+env GOSUMDB=off
+env GOPROXY=direct
+
+# Server responses should be truncated to some reasonable number of lines.
+# (For now, exactly eight.)
+! go list -m vcs-test.golang.org/auth/ormanylines@latest
+stderr '\tserver response:\n(.|\n)*\tline 8\n\t\[Truncated: too many lines.\]$'
+
+# Server responses should be truncated to some reasonable number of characters.
+! go list -m vcs-test.golang.org/auth/oronelongline@latest
+! stderr 'blah{40}'
+stderr '\tserver response: \[Truncated: too long\.\]$'
+
+# Responses from servers using the 'mod' protocol should be propagated.
+! go list -m vcs-test.golang.org/go/modauth404@latest
+stderr '\tserver response: File\? What file\?'
diff --git a/src/cmd/go/testdata/script/mod_proxy_https.txt b/src/cmd/go/testdata/script/mod_proxy_https.txt
new file mode 100644
index 0000000..a23090c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_proxy_https.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=on
+
+# GOPROXY file paths must provide the "file://" prefix explicitly.
+env GOPROXY=$WORK/proxydir
+! go list -versions -m golang.org/x/text
+stderr 'invalid proxy URL.*proxydir'
+
+[!net] stop
+
+# GOPROXY HTTPS paths may elide the "https://" prefix.
+# (See golang.org/issue/32191.)
+env GOPROXY=proxy.golang.org
+go list -versions -m golang.org/x/text
+
+-- go.mod --
+module example.com
+go 1.13
+-- $WORK/proxydir/README.md --
+This proxy contains no data.
diff --git a/src/cmd/go/testdata/script/mod_proxy_invalid.txt b/src/cmd/go/testdata/script/mod_proxy_invalid.txt
new file mode 100644
index 0000000..6427cc1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_proxy_invalid.txt
@@ -0,0 +1,8 @@
+env GO111MODULE=on
+env GOPROXY=$GOPROXY/invalid
+
+! go list -m rsc.io/quote@latest
+stderr '^go list -m: module rsc.io/quote: invalid response from proxy "'$GOPROXY'": invalid character ''i'' looking for beginning of value$'
+
+! go list -m rsc.io/quote@1.5.2
+stderr '^go list -m: rsc.io/quote@1.5.2: invalid version: invalid response from proxy "'$GOPROXY'": invalid character ''i'' looking for beginning of value$'
diff --git a/src/cmd/go/testdata/script/mod_proxy_list.txt b/src/cmd/go/testdata/script/mod_proxy_list.txt
new file mode 100644
index 0000000..89129f4
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_proxy_list.txt
@@ -0,0 +1,37 @@
+env GO111MODULE=on
+env proxy=$GOPROXY
+
+# Proxy that can't serve should fail.
+env GOPROXY=$proxy/404
+! go get -d rsc.io/quote@v1.0.0
+stderr '404 Not Found'
+
+# get should walk down the proxy list past 404 and 410 responses.
+env GOPROXY=$proxy/404,$proxy/410,$proxy
+go get -d rsc.io/quote@v1.1.0
+
+# get should not walk past other 4xx errors if proxies are separated with ','.
+env GOPROXY=$proxy/403,$proxy
+! go get -d rsc.io/quote@v1.2.0
+stderr 'reading.*/403/rsc.io/.*: 403 Forbidden'
+
+# get should not walk past non-4xx errors if proxies are separated with ','.
+env GOPROXY=$proxy/500,$proxy
+! go get -d rsc.io/quote@v1.3.0
+stderr 'reading.*/500/rsc.io/.*: 500 Internal Server Error'
+
+# get should walk past other 4xx errors if proxies are separated with '|'.
+env GOPROXY=$proxy/403|https://0.0.0.0|$proxy
+go get -d rsc.io/quote@v1.2.0
+
+# get should walk past non-4xx errors if proxies are separated with '|'.
+env GOPROXY=$proxy/500|https://0.0.0.0|$proxy
+go get -d rsc.io/quote@v1.3.0
+
+# get should return the final error if that's all we have.
+env GOPROXY=$proxy/404,$proxy/410
+! go get -d rsc.io/quote@v1.4.0
+stderr 'reading.*/410/rsc.io/.*: 410 Gone'
+
+-- go.mod --
+module x
diff --git a/src/cmd/go/testdata/script/mod_pseudo_cache.txt b/src/cmd/go/testdata/script/mod_pseudo_cache.txt
new file mode 100644
index 0000000..dd89614
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_pseudo_cache.txt
@@ -0,0 +1,29 @@
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+
+# Regression test for golang.org/issue/27171: after resolving an older
+# pseudo-version of a commit, future resolution of that commit by hash should
+# choose the highest appropriate pseudo-version instead of the cached one.
+
+go mod download -json golang.org/x/text@v0.0.0-20171215141712-a1b916ed6726
+stdout '"Version": "v0.0.0-20171215141712-a1b916ed6726",'
+
+# If GOPROXY is 'off', lookups should use whatever pseudo-version is available.
+env GOPROXY=off
+go mod download -json golang.org/x/text@a1b916ed6726
+stdout '"Version": "v0.0.0-20171215141712-a1b916ed6726",'
+
+# If we can re-resolve the commit to a pseudo-version, fetching the commit by
+# hash should use the highest such pseudo-version appropriate to the commit.
+env GOPROXY=direct
+go mod download -json golang.org/x/text@a1b916ed6726
+stdout '"Version": "v0.3.1-0.20171215141712-a1b916ed6726",'
+
+# If GOPROXY is 'off', lookups should use the highest pseudo-version in the cache.
+env GOPROXY=off
+go mod download -json golang.org/x/text@a1b916ed6726
+stdout '"Version": "v0.3.1-0.20171215141712-a1b916ed6726",'
diff --git a/src/cmd/go/testdata/script/mod_query.txt b/src/cmd/go/testdata/script/mod_query.txt
new file mode 100644
index 0000000..a75f86e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_query.txt
@@ -0,0 +1,43 @@
+env GO111MODULE=on
+
+# TODO(golang.org/issue/41297): we shouldn't need go.sum. None of the commands
+# below depend on the build list.
+
+go list -m -versions rsc.io/quote
+stdout '^rsc.io/quote v1.0.0 v1.1.0 v1.2.0 v1.2.1 v1.3.0 v1.4.0 v1.5.0 v1.5.1 v1.5.2 v1.5.3-pre1$'
+
+# Latest rsc.io/quote should be v1.5.2, not v1.5.3-pre1.
+go list -m rsc.io/quote@latest
+stdout 'rsc.io/quote v1.5.2$'
+
+# Same for rsc.io/quote@v1 and rsc.io/quote@v1.5 (with no patch version).
+go list -m rsc.io/quote@v1
+stdout 'rsc.io/quote v1.5.2$'
+go list -m rsc.io/quote@v1.5
+stdout 'rsc.io/quote v1.5.2$'
+
+# We should fall back to prereleases if no release tags match...
+go list -m rsc.io/quote@>v1.5.2
+stdout 'rsc.io/quote v1.5.3-pre1$'
+
+# ...but prefer release versions when given the option.
+go list -m rsc.io/quote@<v1.5.4
+stdout 'rsc.io/quote v1.5.2$'
+
+! go list -m rsc.io/quote@>v1.5.3
+stderr 'go list -m: module rsc.io/quote: no matching versions for query ">v1.5.3"'
+
+go list -m -e -f '{{.Error.Err}}' rsc.io/quote@>v1.5.3
+stdout 'no matching versions for query ">v1.5.3"'
+
+-- go.mod --
+module x
+require rsc.io/quote v1.0.0
+
+-- go.sum --
+rsc.io/quote v1.0.0 h1:kQ3IZQzPTiDJxSZI98YaWgxFEhlNdYASHvh+MplbViw=
+rsc.io/quote v1.0.0/go.mod h1:v83Ri/njykPcgJltBc/gEkJTmjTsNgtO1Y7vyIK1CQA=
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_query_empty.txt b/src/cmd/go/testdata/script/mod_query_empty.txt
new file mode 100644
index 0000000..f8b6e3e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_query_empty.txt
@@ -0,0 +1,73 @@
+env GO111MODULE=on
+env GOSUMDB=off
+
+go mod download example.com/join@v1.1.0
+
+# If the proxy serves a bogus result for the @latest version,
+# reading that version should cause 'go get' to fail.
+env GOPROXY=file:///$WORK/badproxy
+cp go.mod.orig go.mod
+! go get -d example.com/join/subpkg
+stderr 'go get: example.com/join/subpkg@v0.0.0-20190624000000-123456abcdef: .*'
+
+# If @v/list is empty, the 'go' command should still try to resolve
+# other module paths.
+env GOPROXY=file:///$WORK/emptysub
+cp go.mod.orig go.mod
+go get -d example.com/join/subpkg
+go list -m example.com/join/...
+! stdout 'example.com/join/subpkg'
+stdout 'example.com/join v1.1.0'
+
+# If @v/list includes a version that the proxy does not actually serve,
+# that version is treated as nonexistent.
+env GOPROXY=file:///$WORK/notfound
+cp go.mod.orig go.mod
+go get -d example.com/join/subpkg
+go list -m example.com/join/...
+! stdout 'example.com/join/subpkg'
+stdout 'example.com/join v1.1.0'
+
+# If the proxy provides an empty @v/list but rejects @latest with
+# some other explicit error (for example, a "permission denied" error),
+# that error should be reported to the user (and override a successful
+# result for other possible module paths).
+#
+# Depending on how the specific platform enforces permissions, the 'go get' may
+# fail either due to the intended permission error or due to a parse error.
+# We accept either failure message.
+env GOPROXY=file:///$WORK/gatekeeper
+chmod 0000 $WORK/gatekeeper/example.com/join/subpkg/@latest
+cp go.mod.orig go.mod
+! go get -d example.com/join/subpkg
+stderr 'go get: module example.com/join/subpkg: (invalid response from proxy ".+": invalid character .+|reading file://.*/gatekeeper/example.com/join/subpkg/@latest: .+)'
+
+-- go.mod.orig --
+module example.com/othermodule
+go 1.13
+-- $WORK/badproxy/example.com/join/subpkg/@v/list --
+v0.0.0-20190624000000-123456abcdef
+-- $WORK/badproxy/example.com/join/subpkg/@v/v0.0.0-20190624000000-123456abcdef.info --
+This file is not valid JSON.
+-- $WORK/badproxy/example.com/join/@v/list --
+v1.1.0
+-- $WORK/badproxy/example.com/join/@v/v1.1.0.info --
+{"Version": "v1.1.0"}
+-- $WORK/emptysub/example.com/join/subpkg/@v/list --
+-- $WORK/emptysub/example.com/join/@v/list --
+v1.1.0
+-- $WORK/emptysub/example.com/join/@v/v1.1.0.info --
+{"Version": "v1.1.0"}
+-- $WORK/notfound/example.com/join/subpkg/@v/list --
+v1.0.0-does-not-exist
+-- $WORK/notfound/example.com/join/@v/list --
+v1.1.0
+-- $WORK/notfound/example.com/join/@v/v1.1.0.info --
+{"Version": "v1.1.0"}
+-- $WORK/gatekeeper/example.com/join/subpkg/@v/list --
+-- $WORK/gatekeeper/example.com/join/subpkg/@latest --
+ERROR: Latest version is forbidden.
+-- $WORK/gatekeeper/example.com/join/@v/list --
+v1.1.0
+-- $WORK/gatekeeper/example.com/join/@v/v1.1.0.info --
+{"Version": "v1.1.0"}
diff --git a/src/cmd/go/testdata/script/mod_query_exclude.txt b/src/cmd/go/testdata/script/mod_query_exclude.txt
new file mode 100644
index 0000000..b001969
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_query_exclude.txt
@@ -0,0 +1,46 @@
+env GO111MODULE=on
+
+# list excluded version
+go list -modfile=go.exclude.mod -m rsc.io/quote@v1.5.0
+stdout '^rsc.io/quote v1.5.0$'
+
+# list versions should not print excluded versions
+go list -m -versions rsc.io/quote
+stdout '\bv1.5.0\b'
+go list -modfile=go.exclude.mod -m -versions rsc.io/quote
+! stdout '\bv1.5.0\b'
+
+# list query with excluded version
+go list -m rsc.io/quote@>=v1.5
+stdout '^rsc.io/quote v1.5.0$'
+go list -modfile=go.exclude.mod -m rsc.io/quote@>=v1.5
+stdout '^rsc.io/quote v1.5.1$'
+
+# get excluded version
+cp go.exclude.mod go.exclude.mod.orig
+! go get -modfile=go.exclude.mod -d rsc.io/quote@v1.5.0
+stderr '^go get: rsc.io/quote@v1.5.0: excluded by go.mod$'
+
+# get non-excluded version
+cp go.exclude.mod.orig go.exclude.mod
+go get -modfile=go.exclude.mod -d rsc.io/quote@v1.5.1
+stderr 'rsc.io/quote v1.5.1'
+
+# get query with excluded version
+cp go.exclude.mod.orig go.exclude.mod
+go get -modfile=go.exclude.mod -d rsc.io/quote@>=v1.5
+go list -modfile=go.exclude.mod -m ...quote
+stdout 'rsc.io/quote v1.5.[1-9]'
+
+-- go.mod --
+module x
+
+-- go.exclude.mod --
+module x
+
+exclude rsc.io/quote v1.5.0
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
+
diff --git a/src/cmd/go/testdata/script/mod_query_main.txt b/src/cmd/go/testdata/script/mod_query_main.txt
new file mode 100644
index 0000000..39e5841
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_query_main.txt
@@ -0,0 +1,43 @@
+# 'go mod download' can download specific versions of the main module.
+go mod download rsc.io/quote@5d9f230b
+go mod download rsc.io/quote@v1.5.2
+go mod download rsc.io/quote@latest
+
+# 'go mod download' will not download @upgrade or @patch, since they always
+# resolve to the main module.
+go mod download rsc.io/quote@upgrade
+stderr '^go mod download: skipping argument rsc.io/quote@upgrade that resolves to the main module$'
+go mod download rsc.io/quote@patch
+stderr '^go mod download: skipping argument rsc.io/quote@patch that resolves to the main module$'
+
+# 'go list -m' can show a version of the main module.
+go list -m rsc.io/quote@5d9f230b
+stdout '^rsc.io/quote v0.0.0-20180710144737-5d9f230bcfba$'
+go list -m rsc.io/quote@v1.5.2
+stdout '^rsc.io/quote v1.5.2$'
+go list -m rsc.io/quote@latest
+stdout '^rsc.io/quote v1.5.2$'
+
+# 'go list -m -versions' shows available versions.
+go list -m -versions rsc.io/quote
+stdout '^rsc.io/quote.*v1.5.2'
+
+# 'go list -m' resolves @upgrade and @patch to the main module.
+go list -m rsc.io/quote@upgrade
+stdout '^rsc.io/quote$'
+go list -m rsc.io/quote@patch
+stdout '^rsc.io/quote$'
+
+# 'go get' will not attempt to upgrade the main module to any specific version.
+# See also: mod_get_main.txt.
+! go get rsc.io/quote@5d9f230b
+stderr '^go get: can''t request version "5d9f230b" of the main module \(rsc.io/quote\)$'
+! go get rsc.io/quote@v1.5.2
+stderr '^go get: can''t request version "v1.5.2" of the main module \(rsc.io/quote\)$'
+! go get rsc.io/quote@latest
+stderr '^go get: can''t request version "latest" of the main module \(rsc.io/quote\)$'
+
+-- go.mod --
+module rsc.io/quote
+
+go 1.16
diff --git a/src/cmd/go/testdata/script/mod_readonly.txt b/src/cmd/go/testdata/script/mod_readonly.txt
new file mode 100644
index 0000000..d05ad2a
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_readonly.txt
@@ -0,0 +1,131 @@
+env GO111MODULE=on
+[short] skip
+
+# -mod=readonly must not resolve missing modules nor update go.mod
+env GOFLAGS=-mod=readonly
+go mod edit -fmt
+cp go.mod go.mod.empty
+! go list all
+stderr '^x.go:2:8: cannot find module providing package rsc\.io/quote: import lookup disabled by -mod=readonly'
+! stderr '\(\)' # If we don't have a reason for -mod=readonly, don't log an empty one.
+cmp go.mod go.mod.empty
+
+# -mod=readonly should be set by default.
+env GOFLAGS=
+! go list all
+stderr '^x.go:2:8: no required module provides package rsc\.io/quote; to add it:\n\tgo get rsc\.io/quote$'
+cmp go.mod go.mod.empty
+
+env GOFLAGS=-mod=readonly
+
+# update go.mod - go get allowed
+go get -d rsc.io/quote
+grep rsc.io/quote go.mod
+
+# update go.mod - go mod tidy allowed
+cp go.mod.empty go.mod
+go mod tidy
+cp go.mod go.mod.tidy
+
+# -mod=readonly must succeed once go.mod is up-to-date...
+go list all
+
+# ... even if it needs downloads
+go clean -modcache
+go list all
+
+# -mod=readonly must not cause 'go list -m' to fail.
+# (golang.org/issue/36478)
+go list -m all
+! stderr 'cannot query module'
+
+# -mod=readonly should reject inconsistent go.mod files
+# (ones that would be rewritten).
+go get -d rsc.io/sampler@v1.2.0
+go mod edit -require rsc.io/quote@v1.5.2
+cp go.mod go.mod.inconsistent
+! go list
+stderr 'go: updates to go.mod needed, disabled by -mod=readonly'
+cmp go.mod go.mod.inconsistent
+
+# We get a different message when -mod=readonly is used by default.
+env GOFLAGS=
+! go list
+stderr '^go: updates to go.mod needed; to update it:\n\tgo mod tidy'
+
+# However, it should not reject files missing a 'go' directive,
+# since that was not always required.
+cp go.mod.nogo go.mod
+go list all
+cmp go.mod go.mod.nogo
+
+# Nor should it reject files with redundant (not incorrect)
+# requirements.
+cp go.mod.redundant go.mod
+go list all
+cmp go.mod go.mod.redundant
+
+cp go.mod.indirect go.mod
+go list all
+cmp go.mod go.mod.indirect
+
+
+# If we identify a missing package as a dependency of some other package in the
+# main module, we should suggest 'go mod tidy' instead of resolving it.
+
+cp go.mod.untidy go.mod
+! go list all
+stderr '^x.go:2:8: no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'
+
+! go list -deps .
+stderr '^x.go:2:8: no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'
+
+# However, if we didn't see an import from the main module, we should suggest
+# 'go get -d' instead, because we don't know whether 'go mod tidy' would add it.
+! go list rsc.io/quote
+stderr '^no required module provides package rsc.io/quote; to add it:\n\tgo get rsc.io/quote$'
+
+
+-- go.mod --
+module m
+
+go 1.16
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
+-- go.mod.nogo --
+module m
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.redundant --
+module m
+
+go 1.16
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.3.0 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.indirect --
+module m
+
+go 1.16
+
+require (
+	rsc.io/quote v1.5.2 // indirect
+	rsc.io/sampler v1.3.0 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.untidy --
+module m
+
+go 1.16
+
+require (
+	rsc.io/sampler v1.3.0 // indirect
+)
diff --git a/src/cmd/go/testdata/script/mod_replace.txt b/src/cmd/go/testdata/script/mod_replace.txt
new file mode 100644
index 0000000..dc9667f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_replace.txt
@@ -0,0 +1,129 @@
+env GO111MODULE=on
+[short] skip
+
+cp go.mod go.mod.orig
+
+# Make sure the test builds without replacement.
+go build -mod=mod -o a1.exe .
+exec ./a1.exe
+stdout 'Don''t communicate by sharing memory'
+
+# Modules can be replaced by local packages.
+cp go.mod.orig go.mod
+go mod edit -replace=rsc.io/quote/v3=./local/rsc.io/quote/v3
+go build -o a2.exe .
+exec ./a2.exe
+stdout 'Concurrency is not parallelism.'
+
+# The module path of the replacement doesn't need to match.
+# (For example, it could be a long-running fork with its own import path.)
+cp go.mod.orig go.mod
+go mod edit -replace=rsc.io/quote/v3=./local/not-rsc.io/quote/v3
+go build -o a3.exe .
+exec ./a3.exe
+stdout 'Clear is better than clever.'
+
+# However, the same module can't be used as two different paths.
+cp go.mod.orig go.mod
+go mod edit -replace=not-rsc.io/quote/v3@v3.0.0=rsc.io/quote/v3@v3.0.0 -require=not-rsc.io/quote/v3@v3.0.0
+! go build -o a4.exe .
+stderr 'rsc.io/quote/v3@v3.0.0 used for two different module paths \(not-rsc.io/quote/v3 and rsc.io/quote/v3\)'
+
+# Modules that do not (yet) exist upstream can be replaced too.
+cp go.mod.orig go.mod
+go mod edit -replace=not-rsc.io/quote/v3@v3.1.0=./local/rsc.io/quote/v3
+go build -mod=mod -o a5.exe ./usenewmodule
+! stderr 'finding not-rsc.io/quote/v3'
+grep 'not-rsc.io/quote/v3 v3.1.0' go.mod
+exec ./a5.exe
+stdout 'Concurrency is not parallelism.'
+
+# Error messages for modules not found in replacements should
+# indicate the replacement module.
+cp go.mod.orig go.mod
+go mod edit -replace=rsc.io/quote/v3=./local/rsc.io/quote/v3
+! go get -d rsc.io/quote/v3/missing-package
+stderr 'module rsc.io/quote/v3@upgrade found \(v3.0.0, replaced by ./local/rsc.io/quote/v3\), but does not contain package'
+
+# The reported Dir and GoMod for a replaced module should be accurate.
+cp go.mod.orig go.mod
+go mod edit -replace=rsc.io/quote/v3=not-rsc.io/quote@v0.1.0-nomod
+go mod download
+go list -m -f '{{.Path}} {{.Version}} {{.Dir}} {{.GoMod}}{{with .Replace}} => {{.Path}} {{.Version}} {{.Dir}} {{.GoMod}}{{end}}' rsc.io/quote/v3
+stdout '^rsc.io/quote/v3 v3.0.0 '$GOPATH'[/\\]pkg[/\\]mod[/\\]not-rsc.io[/\\]quote@v0.1.0-nomod '$GOPATH'[/\\]pkg[/\\]mod[/\\]cache[/\\]download[/\\]not-rsc.io[/\\]quote[/\\]@v[/\\]v0.1.0-nomod.mod => not-rsc.io/quote v0.1.0-nomod '$GOPATH'[/\\]pkg[/\\]mod[/\\]not-rsc.io[/\\]quote@v0.1.0-nomod '$GOPATH'[/\\]pkg[/\\]mod[/\\]cache[/\\]download[/\\]not-rsc.io[/\\]quote[/\\]@v[/\\]v0.1.0-nomod.mod$'
+
+-- go.mod --
+module quoter
+
+require rsc.io/quote/v3 v3.0.0
+
+-- main.go --
+package main
+
+import (
+	"fmt"
+	"rsc.io/quote/v3"
+)
+
+func main() {
+	fmt.Println(quote.GoV3())
+}
+
+-- usenewmodule/main.go --
+package main
+
+import (
+	"fmt"
+	"not-rsc.io/quote/v3"
+)
+
+func main() {
+	fmt.Println(quote.GoV3())
+}
+
+-- local/rsc.io/quote/v3/go.mod --
+module rsc.io/quote/v3
+
+require rsc.io/sampler v1.3.0
+
+-- local/rsc.io/quote/v3/quote.go --
+// Copyright 2018 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Package quote collects pithy sayings.
+package quote
+
+import "rsc.io/sampler"
+
+// Hello returns a greeting.
+func HelloV3() string {
+	return sampler.Hello()
+}
+
+// Glass returns a useful phrase for world travelers.
+func GlassV3() string {
+	// See http://www.oocities.org/nodotus/hbglass.html.
+	return "I can eat glass and it doesn't hurt me."
+}
+
+// Go returns a REPLACED Go proverb.
+func GoV3() string {
+	return "Concurrency is not parallelism."
+}
+
+// Opt returns a optimization truth.
+func OptV3() string {
+	// Wisdom from ken.
+	return "If a program is too slow, it must have a loop."
+}
+
+-- local/not-rsc.io/quote/v3/go.mod --
+module not-rsc.io/quote/v3
+
+-- local/not-rsc.io/quote/v3/quote.go --
+package quote
+
+func GoV3() string {
+	return "Clear is better than clever."
+}
diff --git a/src/cmd/go/testdata/script/mod_replace_gopkgin.txt b/src/cmd/go/testdata/script/mod_replace_gopkgin.txt
new file mode 100644
index 0000000..df752d9
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_replace_gopkgin.txt
@@ -0,0 +1,80 @@
+# Regression test for golang.org/issue/34254:
+# a clone of gopkg.in/[…].vN should be replaceable by
+# a fork hosted at corp.example.com/[…]/vN,
+# even if there is an explicit go.mod file containing the
+# gopkg.in path.
+
+[short] skip
+[!net] skip
+[!exec:git] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+env GOSUMDB=off
+env GOFLAGS=-mod=mod
+
+# Replacing gopkg.in/[…].vN with a repository with a root go.mod file
+# specifying […].vN and a compatible version should succeed, even if
+# the replacement path is not a gopkg.in path.
+cd 4-to-4
+go list -m gopkg.in/src-d/go-git.v4
+
+# Previous versions of the "go" command accepted v0 and v1 pseudo-versions
+# as replacements for gopkg.in/[…].v4.
+# As a special case, we continue to accept those.
+
+cd ../4-to-0
+go list -m gopkg.in/src-d/go-git.v4
+
+cd ../4-to-1
+go list -m gopkg.in/src-d/go-git.v4
+
+cd ../4-to-incompatible
+go list -m gopkg.in/src-d/go-git.v4
+
+# A mismatched gopkg.in path should not be able to replace a different major version.
+cd ../3-to-gomod-4
+! go list -m gopkg.in/src-d/go-git.v3
+stderr '^go: gopkg\.in/src-d/go-git\.v3@v3\.2\.0 \(replaced by gopkg\.in/src-d/go-git\.v3@v3\.0\.0-20190801152248-0d1a009cbb60\): version "v3\.0\.0-20190801152248-0d1a009cbb60" invalid: go\.mod has non-\.\.\.\.v3 module path "gopkg\.in/src-d/go-git\.v4" at revision 0d1a009cbb60$'
+
+-- 4-to-4/go.mod --
+module golang.org/issue/34254
+
+go 1.13
+
+require gopkg.in/src-d/go-git.v4 v4.13.1
+
+replace gopkg.in/src-d/go-git.v4 v4.13.1 => github.com/src-d/go-git/v4 v4.13.1
+-- 4-to-1/go.mod --
+module golang.org/issue/34254
+
+go 1.13
+
+require gopkg.in/src-d/go-git.v4 v4.13.1
+
+replace gopkg.in/src-d/go-git.v4 v4.13.1 => github.com/src-d/go-git v1.0.1-0.20190801152248-0d1a009cbb60
+-- 4-to-0/go.mod --
+module golang.org/issue/34254
+
+go 1.13
+
+require gopkg.in/src-d/go-git.v4 v4.13.1
+
+replace gopkg.in/src-d/go-git.v4 v4.13.1 => github.com/src-d/go-git v0.0.0-20190801152248-0d1a009cbb60
+-- 4-to-incompatible/go.mod --
+module golang.org/issue/34254
+
+go 1.13
+
+require gopkg.in/src-d/go-git.v4 v4.13.1
+
+replace gopkg.in/src-d/go-git.v4 v4.13.1 => github.com/src-d/go-git v4.6.0+incompatible
+-- 3-to-gomod-4/go.mod --
+module golang.org/issue/34254
+go 1.13
+
+require gopkg.in/src-d/go-git.v3 v3.2.0
+
+// This replacement has a go.mod file declaring its path to be
+// gopkg.in/src-d/go-git.v4, so it cannot be used as a replacement for v3.
+replace gopkg.in/src-d/go-git.v3 v3.2.0 => gopkg.in/src-d/go-git.v3 v3.0.0-20190801152248-0d1a009cbb60
diff --git a/src/cmd/go/testdata/script/mod_replace_import.txt b/src/cmd/go/testdata/script/mod_replace_import.txt
new file mode 100644
index 0000000..2add31f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_replace_import.txt
@@ -0,0 +1,144 @@
+env GO111MODULE=on
+
+# 'go list' should not add requirements even if they can be resolved locally.
+cp go.mod go.mod.orig
+! go list all
+cmp go.mod go.mod.orig
+
+# 'go list' should resolve imports using replacements.
+go get -d
+go list all
+stdout 'example.com/a/b$'
+stdout 'example.com/x/v3$'
+stdout 'example.com/y/z/w$'
+stdout 'example.com/v'
+
+# The selected modules should prefer longer paths,
+# but should try shorter paths if needed.
+# Modules with a major-version suffix should have a corresponding pseudo-version.
+# Replacements that specify a version should use the latest such version.
+go list -m all
+stdout 'example.com/a/b v0.0.0-00010101000000-000000000000 => ./b'
+stdout 'example.com/y v0.0.0-00010101000000-000000000000 => ./y'
+stdout 'example.com/x/v3 v3.0.0-00010101000000-000000000000 => ./v3'
+stdout 'example.com/v v1.12.0 => ./v12'
+
+# The go command should print an informative error when the matched
+# module does not contain a package.
+# TODO(#26909): Ideally these errors should include line numbers for the imports within the main module.
+cd fail
+! go mod tidy
+stderr '^localhost.fail imports\n\tw: module w@latest found \(v0.0.0-00010101000000-000000000000, replaced by ../w\), but does not contain package w$'
+stderr '^localhost.fail imports\n\tnonexist: nonexist@v0.1.0: replacement directory ../nonexist does not exist$'
+
+-- go.mod --
+module example.com/m
+
+replace (
+	example.com/a => ./a
+	example.com/a/b => ./b
+)
+
+replace (
+	example.com/x => ./x
+	example.com/x/v3 => ./v3
+)
+
+replace (
+	example.com/y/z/w => ./w
+	example.com/y => ./y
+)
+
+replace (
+	example.com/v v1.11.0 => ./v11
+	example.com/v v1.12.0 => ./v12
+	example.com/v => ./v
+)
+
+replace (
+	example.com/i v2.0.0+incompatible => ./i2
+)
+
+-- m.go --
+package main
+import (
+	_ "example.com/a/b"
+	_ "example.com/x/v3"
+	_ "example.com/y/z/w"
+	_ "example.com/v"
+	_ "example.com/i"
+)
+func main() {}
+
+-- a/go.mod --
+module a.localhost
+-- a/a.go --
+package a
+-- a/b/b.go--
+package b
+
+-- b/go.mod --
+module a.localhost/b
+-- b/b.go --
+package b
+
+-- x/go.mod --
+module x.localhost
+-- x/x.go --
+package x
+-- x/v3.go --
+package v3
+import _ "x.localhost/v3"
+
+-- v3/go.mod --
+module x.localhost/v3
+-- v3/x.go --
+package x
+
+-- w/go.mod --
+module w.localhost
+-- w/skip/skip.go --
+// Package skip is nested below nonexistent package w.
+package skip
+
+-- y/go.mod --
+module y.localhost
+-- y/z/w/w.go --
+package w
+
+-- v12/go.mod --
+module v.localhost
+-- v12/v.go --
+package v
+
+-- v11/go.mod --
+module v.localhost
+-- v11/v.go --
+package v
+
+-- v/go.mod --
+module v.localhost
+-- v/v.go --
+package v
+
+-- i2/go.mod --
+module example.com/i
+-- i2/i.go --
+package i
+
+-- fail/m.go --
+package main
+
+import (
+	_ "w"
+	_ "nonexist"
+)
+
+func main() {}
+
+-- fail/go.mod --
+module localhost.fail
+
+replace w => ../w
+
+replace nonexist v0.1.0 => ../nonexist
diff --git a/src/cmd/go/testdata/script/mod_replace_readonly.txt b/src/cmd/go/testdata/script/mod_replace_readonly.txt
new file mode 100644
index 0000000..d950d78
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_replace_readonly.txt
@@ -0,0 +1,62 @@
+# Check that with -mod=readonly, when we load a package in a module that is
+# replaced but not required, we emit an error with the command to add the
+# requirement.
+# Verifies golang.org/issue/41416, golang.org/issue/41577.
+cp go.mod go.mod.orig
+
+# Replace all versions of a module without requiring it.
+# With -mod=mod, we'd add a requirement for a "zero" pseudo-version, but we
+# can't in readonly mode, since its go.mod may alter the build list.
+go mod edit -replace rsc.io/quote=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; to add it:\n\tgo get rsc.io/quote$'
+go get -d rsc.io/quote
+cmp go.mod go.mod.latest
+go list rsc.io/quote
+cp go.mod.orig go.mod
+
+# Same test with a specific version.
+go mod edit -replace rsc.io/quote@v1.0.0-doesnotexist=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; to add it:\n\tgo get rsc.io/quote@v1.0.0-doesnotexist$'
+go get -d rsc.io/quote@v1.0.0-doesnotexist
+cmp go.mod go.mod.specific
+go list rsc.io/quote
+cp go.mod.orig go.mod
+
+# If there are multiple versions, the highest is suggested.
+go mod edit -replace rsc.io/quote@v1.0.0-doesnotexist=./quote
+go mod edit -replace rsc.io/quote@v1.1.0-doesnotexist=./quote
+! go list rsc.io/quote
+stderr '^module rsc.io/quote provides package rsc.io/quote and is replaced but not required; to add it:\n\tgo get rsc.io/quote@v1.1.0-doesnotexist$'
+
+-- go.mod --
+module m
+
+go 1.16
+-- go.mod.latest --
+module m
+
+go 1.16
+
+replace rsc.io/quote => ./quote
+
+require rsc.io/quote v1.5.2 // indirect
+-- go.mod.specific --
+module m
+
+go 1.16
+
+replace rsc.io/quote v1.0.0-doesnotexist => ./quote
+
+require rsc.io/quote v1.0.0-doesnotexist // indirect
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+-- quote/go.mod --
+module rsc.io/quote
+
+go 1.16
+-- quote/quote.go --
+package quote
diff --git a/src/cmd/go/testdata/script/mod_require_exclude.txt b/src/cmd/go/testdata/script/mod_require_exclude.txt
new file mode 100644
index 0000000..9156d4c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_require_exclude.txt
@@ -0,0 +1,81 @@
+# build with no newer version to satisfy exclude
+env GO111MODULE=on
+cp go.mod go.mod.orig
+
+# With the selected version excluded, commands that query that version without
+# updating go.mod should fail.
+
+! go list -mod=readonly -m all
+stderr '^go: ignoring requirement on excluded version rsc.io/sampler v1\.99\.99$'
+stderr '^go: updates to go.mod needed, disabled by -mod=readonly$'
+! stdout '^rsc.io/sampler v1.99.99'
+cmp go.mod go.mod.orig
+
+! go list -mod=vendor -m rsc.io/sampler
+stderr '^go: ignoring requirement on excluded version rsc.io/sampler v1\.99\.99$'
+stderr '^go list -m: module rsc.io/sampler: can''t resolve module using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass\.\)$'
+! stdout '^rsc.io/sampler v1.99.99'
+cmp go.mod go.mod.orig
+
+# With the selected version excluded, commands that load only modules should
+# drop the excluded module.
+
+go list -m -mod=mod all
+stderr '^go: dropping requirement on excluded version rsc.io/sampler v1\.99\.99$'
+stdout '^x$'
+! stdout '^rsc.io/sampler'
+cmp go.mod go.moddrop
+
+# With the latest version excluded, 'go list' should resolve needed packages
+# from the next-highest version.
+
+cp go.mod.orig go.mod
+go list -mod=mod -f '{{with .Module}}{{.Path}} {{.Version}}{{end}}' all
+stderr '^go: dropping requirement on excluded version rsc.io/sampler v1\.99\.99$'
+stdout '^x $'
+! stdout '^rsc.io/sampler v1.99.99'
+stdout '^rsc.io/sampler v1.3.0'
+
+# build with newer version available
+cp go.mod2 go.mod
+go list -mod=mod -f '{{with .Module}}{{.Path}} {{.Version}}{{end}}' all
+stderr '^go: dropping requirement on excluded version rsc.io/quote v1\.5\.1$'
+stdout 'rsc.io/quote v1.5.2'
+
+# build with excluded newer version
+cp go.mod3 go.mod
+go list -mod=mod -f '{{with .Module}}{{.Path}} {{.Version}}{{end}}' all
+! stderr '^go: dropping requirement'
+stdout 'rsc.io/quote v1.5.1'
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
+
+-- go.mod --
+module x
+
+go 1.13
+
+exclude rsc.io/sampler v1.99.99
+require rsc.io/sampler v1.99.99
+-- go.moddrop --
+module x
+
+go 1.13
+
+exclude rsc.io/sampler v1.99.99
+-- go.mod2 --
+module x
+
+go 1.13
+
+exclude rsc.io/quote v1.5.1
+require rsc.io/quote v1.5.1
+-- go.mod3 --
+module x
+
+go 1.13
+
+exclude rsc.io/quote v1.5.2
+require rsc.io/quote v1.5.1
diff --git a/src/cmd/go/testdata/script/mod_retention.txt b/src/cmd/go/testdata/script/mod_retention.txt
new file mode 100644
index 0000000..a4441c4
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retention.txt
@@ -0,0 +1,145 @@
+# Regression test for golang.org/issue/34822: the 'go' command should prefer not
+# to update the go.mod file if the changes only affect formatting, and should only
+# remove redundant requirements in 'go mod tidy'.
+
+env GO111MODULE=on
+[short] skip
+
+# Control case: verify that go.mod.tidy is actually tidy.
+cp go.mod.tidy go.mod
+go list -mod=mod all
+cmp go.mod go.mod.tidy
+
+
+# If the only difference in the go.mod file is the line endings,
+# it should not be overwritten automatically.
+cp go.mod.crlf go.mod
+go list all
+cmp go.mod go.mod.crlf
+
+# However, 'go mod tidy' should fix whitespace even if there are no other changes.
+go mod tidy
+cmp go.mod go.mod.tidy
+
+
+# Out-of-order requirements should not be overwritten automatically...
+cp go.mod.unsorted go.mod
+go list all
+cmp go.mod go.mod.unsorted
+
+# ...but 'go mod edit -fmt' should sort them.
+go mod edit -fmt
+cmp go.mod go.mod.tidy
+
+
+# "// indirect" comments should be removed if direct dependencies are seen.
+# changes.
+cp go.mod.indirect go.mod
+go list -mod=mod all
+cmp go.mod go.mod.tidy
+
+# "// indirect" comments should be added if appropriate.
+cp go.mod.toodirect go.mod
+go list all
+cmp go.mod go.mod.toodirect
+go mod vendor # loads everything, so adds "// indirect" comments.
+cmp go.mod go.mod.tidy
+rm -r vendor
+
+
+# Redundant requirements should be preserved...
+cp go.mod.redundant go.mod
+go list all
+cmp go.mod go.mod.redundant
+go mod vendor
+cmp go.mod go.mod.redundant
+rm -r vendor
+
+# ...except by 'go mod tidy'.
+go mod tidy
+cmp go.mod go.mod.tidy
+
+
+# A missing "go" version directive should be added.
+# However, that should not remove other redundant requirements.
+cp go.mod.nogo go.mod
+go list -mod=mod all
+cmpenv go.mod go.mod.currentgo
+
+
+-- go.mod.tidy --
+module m
+
+go 1.14
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- x.go --
+package x
+import _ "rsc.io/quote"
+-- go.mod.crlf --
+module m

+

+go 1.14

+

+require (

+	rsc.io/quote v1.5.2

+	rsc.io/testonly v1.0.0 // indirect

+)

+-- go.mod.unsorted --
+module m
+
+go 1.14
+
+require (
+	rsc.io/testonly v1.0.0 // indirect
+	rsc.io/quote v1.5.2
+)
+-- go.mod.indirect --
+module m
+
+go 1.14
+
+require (
+	rsc.io/quote v1.5.2 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.toodirect --
+module m
+
+go 1.14
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/testonly v1.0.0
+)
+-- go.mod.redundant --
+module m
+
+go 1.14
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.3.0 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.nogo --
+module m
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.3.0 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
+-- go.mod.currentgo --
+module m
+
+go $goversion
+
+require (
+	rsc.io/quote v1.5.2
+	rsc.io/sampler v1.3.0 // indirect
+	rsc.io/testonly v1.0.0 // indirect
+)
diff --git a/src/cmd/go/testdata/script/mod_retract.txt b/src/cmd/go/testdata/script/mod_retract.txt
new file mode 100644
index 0000000..4f95ece
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract.txt
@@ -0,0 +1,45 @@
+cp go.mod go.mod.orig
+
+# 'go list pkg' does not report an error when a retracted version is used.
+go list -e -f '{{if .Error}}{{.Error}}{{end}}' ./use
+! stdout .
+cmp go.mod go.mod.orig
+
+# Nor does 'go build'.
+[!short] go build ./use
+[!short] ! stderr .
+[!short] cmp go.mod go.mod.orig
+
+# Neither 'go list' nor 'go build' should download go.mod from the version
+# that would list retractions.
+exists $GOPATH/pkg/mod/cache/download/example.com/retract/@v/v1.0.0-bad.mod
+! exists $GOPATH/pkg/mod/cache/download/example.com/retract/@v/v1.1.0.mod
+
+# Importing a package from a module with a retracted latest version will
+# select the latest non-retracted version.
+go get -d ./use_self_prev
+go list -m example.com/retract/self/prev
+stdout '^example.com/retract/self/prev v1.1.0$'
+exists $GOPATH/pkg/mod/cache/download/example.com/retract/self/prev/@v/v1.9.0.mod
+
+-- go.mod --
+module example.com/use
+
+go 1.15
+
+require example.com/retract v1.0.0-bad
+
+-- go.sum --
+example.com/retract v1.0.0-bad h1:liAW69rbtjY67x2CcNzat668L/w+YGgNX3lhJsWIJis=
+example.com/retract v1.0.0-bad/go.mod h1:0DvGGofJ9hr1q63cBrOY/jSY52OwhRGA0K47NE80I5Y=
+example.com/retract/self/prev v1.1.0 h1:0/8I/GTG+1eJTFeDQ/fUbgrMsVHHyKhh3Z8DSZp1fuA=
+example.com/retract/self/prev v1.1.0/go.mod h1:xl2EcklWuZZHVtHWcpzfSJQmnzAGpKZYpA/Wto7SZN4=
+-- use/use.go --
+package use
+
+import _ "example.com/retract"
+
+-- use_self_prev/use.go --
+package use_self_prev
+
+import _ "example.com/retract/self/prev"
diff --git a/src/cmd/go/testdata/script/mod_retract_fix_version.txt b/src/cmd/go/testdata/script/mod_retract_fix_version.txt
new file mode 100644
index 0000000..e45758b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_fix_version.txt
@@ -0,0 +1,48 @@
+# retract must not be used without a module directive.
+! go list -m all
+stderr 'go.mod:3: no module directive found, so retract cannot be used$'
+
+# Commands that update go.mod should fix non-canonical versions in
+# retract directives.
+# Verifies #44494.
+go mod edit -module=rsc.io/quote/v2
+! go list -m all
+stderr '^go: updates to go.mod needed; to update it:\n\tgo mod tidy$'
+go mod tidy
+go list -m all
+cmp go.mod go.mod.want
+
+# If a retracted version doesn't match the module's major version suffx,
+# an error should be reported.
+! go mod edit -retract=v3.0.1
+stderr '^go mod: -retract=v3.0.1: version "v3.0.1" invalid: should be v2, not v3$'
+cp go.mod.mismatch-v2 go.mod
+! go list -m all
+stderr 'go.mod:3: retract rsc.io/quote/v2: version "v3.0.1" invalid: should be v2, not v3$'
+
+cp go.mod.mismatch-v1 go.mod
+! go list -m all
+stderr 'go.mod:3: retract rsc.io/quote: version "v3.0.1" invalid: should be v0 or v1, not v3$'
+
+-- go.mod --
+go 1.16
+
+retract latest
+-- go.mod.want --
+go 1.16
+
+retract v2.0.1
+
+module rsc.io/quote/v2
+-- go.mod.mismatch-v2 --
+go 1.16
+
+retract v3.0.1
+
+module rsc.io/quote/v2
+-- go.mod.mismatch-v1 --
+go 1.16
+
+retract v3.0.1
+
+module rsc.io/quote
diff --git a/src/cmd/go/testdata/script/mod_retract_incompatible.txt b/src/cmd/go/testdata/script/mod_retract_incompatible.txt
new file mode 100644
index 0000000..61538e8
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_incompatible.txt
@@ -0,0 +1,15 @@
+# The current version of a module should not be considered when loading
+# retractions. If the current version is +incompatible, we should not prefer
+# +incompatible versions when looking for retractions.
+# Verifies #42601.
+
+go mod init m
+
+# Request a +incompatible version retracted in v1.0.0.
+go get -d example.com/retract/incompatible@v2.0.0+incompatible
+stderr '^go: warning: example.com/retract/incompatible@v2.0.0\+incompatible: retracted by module author$'
+
+# We should still see a warning if the +incompatible was previously in the
+# build list.
+go get -d example.com/retract/incompatible@v2.0.0+incompatible
+stderr '^go: warning: example.com/retract/incompatible@v2.0.0\+incompatible: retracted by module author$'
diff --git a/src/cmd/go/testdata/script/mod_retract_pseudo_base.txt b/src/cmd/go/testdata/script/mod_retract_pseudo_base.txt
new file mode 100644
index 0000000..eb00e84
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_pseudo_base.txt
@@ -0,0 +1,62 @@
+# When converting a commit to a pseudo-version, don't use a retracted version
+# as the base.
+# Verifies golang.org/issue/41700.
+
+[!net] skip
+[!exec:git] skip
+env GOPROXY=direct
+env GOSUMDB=off
+go mod init m
+
+# Control: check that v1.0.0 is the only version and is retracted.
+go list -m -versions vcs-test.golang.org/git/retract-pseudo.git
+stdout '^vcs-test.golang.org/git/retract-pseudo.git$'
+go list -m -versions -retracted vcs-test.golang.org/git/retract-pseudo.git
+stdout '^vcs-test.golang.org/git/retract-pseudo.git v1.0.0$'
+
+# 713affd19d7b is a commit after v1.0.0. Don't use v1.0.0 as the base.
+go list -m vcs-test.golang.org/git/retract-pseudo.git@713affd19d7b
+stdout '^vcs-test.golang.org/git/retract-pseudo.git v0.0.0-20201009173747-713affd19d7b$'
+
+# 64c061ed4371 is the commit v1.0.0 refers to. Don't convert to v1.0.0.
+go list -m vcs-test.golang.org/git/retract-pseudo.git@64c061ed4371
+stdout '^vcs-test.golang.org/git/retract-pseudo.git v0.0.0-20201009173747-64c061ed4371'
+
+# A retracted version is a valid base. Retraction should not validate existing
+# pseudo-versions, nor should it turn invalid pseudo-versions valid.
+go get -d vcs-test.golang.org/git/retract-pseudo.git@v1.0.1-0.20201009173747-713affd19d7b
+go list -m vcs-test.golang.org/git/retract-pseudo.git
+stdout '^vcs-test.golang.org/git/retract-pseudo.git v1.0.1-0.20201009173747-713affd19d7b$'
+
+! go get -d vcs-test.golang.org/git/retract-pseudo.git@v1.0.1-0.20201009173747-64c061ed4371
+stderr '^go get: vcs-test.golang.org/git/retract-pseudo.git@v1.0.1-0.20201009173747-64c061ed4371: invalid pseudo-version: tag \(v1.0.0\) found on revision 64c061ed4371 is already canonical, so should not be replaced with a pseudo-version derived from that tag$'
+
+-- retract-pseudo.sh --
+#!/bin/bash
+
+# This is not part of the test.
+# Run this to generate and update the repository on vcs-test.golang.org.
+
+set -euo pipefail
+
+rm -rf retract-pseudo
+mkdir retract-pseudo
+cd retract-pseudo
+git init
+
+# Create the module.
+# Retract v1.0.0 and tag v1.0.0 at the same commit.
+# The module has no unretracted release versions.
+go mod init vcs-test.golang.org/git/retract-pseudo.git
+go mod edit -retract v1.0.0
+echo 'package p' >p.go
+git add -A
+git commit -m 'create module retract-pseudo'
+git tag v1.0.0
+
+# Commit a trivial change so the default branch does not point to v1.0.0.
+git mv p.go q.go
+git commit -m 'trivial change'
+
+zip -r ../retract-pseudo.zip .
+gsutil cp ../retract-pseudo.zip gs://vcs-test/git/retract-pseudo.zip
diff --git a/src/cmd/go/testdata/script/mod_retract_rationale.txt b/src/cmd/go/testdata/script/mod_retract_rationale.txt
new file mode 100644
index 0000000..4d3a3d6
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_rationale.txt
@@ -0,0 +1,79 @@
+# When there is no rationale, 'go get' should print a hard-coded message.
+go get -d example.com/retract/rationale@v1.0.0-empty
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-empty: retracted by module author$'
+
+# 'go list' should print the same hard-coded message.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale
+stdout '^\[retracted by module author\]$'
+
+
+# When there is a multi-line message, 'go get' should print the first line.
+go get -d example.com/retract/rationale@v1.0.0-multiline1
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-multiline1: retracted by module author: short description$'
+! stderr 'detail'
+
+# 'go list' should show the full message.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale
+cmp stdout multiline
+
+# 'go get' output should be the same whether the retraction appears at top-level
+# or in a block.
+go get -d example.com/retract/rationale@v1.0.0-multiline2
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-multiline2: retracted by module author: short description$'
+! stderr 'detail'
+
+# Same for 'go list'.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale
+cmp stdout multiline
+
+
+# 'go get' should omit long messages.
+go get -d example.com/retract/rationale@v1.0.0-long
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-long: retracted by module author: \(rationale omitted: too long\)'
+
+# 'go list' should show the full message.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale
+stdout '^\[lo{500}ng\]$'
+
+
+# 'go get' should omit messages with unprintable characters.
+go get -d example.com/retract/rationale@v1.0.0-unprintable
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-unprintable: retracted by module author: \(rationale omitted: contains non-printable characters\)'
+
+# 'go list' should show the full message.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale
+stdout '^\[Ends with a BEL character. Beep!\x07\]$'
+
+
+# When there is a comment on a block, but not on individual retractions within
+# the block, the rationale should come from the block comment.
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale@v1.0.0-block
+stdout '^\[block comment\]$'
+go list -m -retracted -f '{{.Retracted}}' example.com/retract/rationale@v1.0.0-blockwithcomment
+stdout '^\[inner comment\]$'
+
+
+# When a version is covered by multiple retractions, all retractions should
+# be reported in the order they appear in the file.
+go list -m -retracted -f '{{range .Retracted}}{{.}},{{end}}' example.com/retract/rationale@v1.0.0-order
+stdout '^degenerate range,single version,$'
+go list -m -retracted -f '{{range .Retracted}}{{.}},{{end}}' example.com/retract/rationale@v1.0.1-order
+stdout '^single version,degenerate range,$'
+
+# 'go get' will only report the first retraction to avoid being too verbose.
+go get -d example.com/retract/rationale@v1.0.0-order
+stderr '^go: warning: example.com/retract/rationale@v1.0.0-order: retracted by module author: degenerate range$'
+go get -d example.com/retract/rationale@v1.0.1-order
+stderr '^go: warning: example.com/retract/rationale@v1.0.1-order: retracted by module author: single version$'
+
+-- go.mod --
+module m
+
+go 1.14
+
+-- multiline --
+[short description
+more
+
+detail
+suffix]
diff --git a/src/cmd/go/testdata/script/mod_retract_rename.txt b/src/cmd/go/testdata/script/mod_retract_rename.txt
new file mode 100644
index 0000000..f54742c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_rename.txt
@@ -0,0 +1,28 @@
+# Populate go.sum.
+go get -d
+
+# 'go list -m -retracted' should load retractions, even if the version
+# containing retractions has a different module path.
+go list -m -retracted -f '{{with .Retracted}}retracted{{end}}' example.com/retract/rename
+
+# 'go list -m -u' should load retractions, too.
+go list -m -u -f '{{with .Retracted}}retracted{{end}}' example.com/retract/rename
+
+# 'go get' should warn about the retracted version.
+go get -d
+stderr '^go: warning: example.com/retract/rename@v1.0.0-bad: retracted by module author: bad$'
+
+# We can't upgrade, since this latest version has a different module path.
+! go get -d example.com/retract/rename
+stderr 'module declares its path as: example.com/retract/newname'
+
+-- go.mod --
+module example.com/use
+
+go 1.16
+
+require example.com/retract/rename v1.0.0-bad
+-- use.go --
+package use
+
+import _ "example.com/retract/rename"
diff --git a/src/cmd/go/testdata/script/mod_retract_replace.txt b/src/cmd/go/testdata/script/mod_retract_replace.txt
new file mode 100644
index 0000000..770aea4
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_retract_replace.txt
@@ -0,0 +1,61 @@
+# If the latest unretracted version of a module is replaced, 'go list' should
+# obtain retractions from the replacement.
+
+# Populate go.sum.
+go get -d
+
+# The latest version, v1.9.0, is not available on the proxy.
+! go list -m -retracted example.com/retract/missingmod
+stderr '^go list -m: loading module retractions for example.com/retract/missingmod@v1.0.0: .*404 Not Found$'
+
+# If we replace that version, we should see retractions.
+go mod edit -replace=example.com/retract/missingmod@v1.9.0=./missingmod-v1.9.0
+go list -m -retracted -f '{{range .Retracted}}{{.}}{{end}}' example.com/retract/missingmod
+stdout '^bad version$'
+
+# If we replace the retracted version, we should not see a retraction.
+go mod edit -replace=example.com/retract/missingmod=./missingmod-v1.9.0
+go list -m -retracted -f '{{if not .Retracted}}good version{{end}}' example.com/retract/missingmod
+stdout '^good version$'
+
+
+# If a replacement version is retracted, we should see a retraction.
+# It should appear in both the replaced module and the replacement, as other
+# fields like GoMod do.
+go list -m -retracted -f '{{range .Retracted}}{{.}}{{end}}' example.com/retract
+! stdout .
+go list -m -retracted -f '{{if .Replace}}replaced{{end}}' example.com/retract
+! stdout .
+go mod edit -replace example.com/retract@v1.0.0-good=example.com/retract@v1.0.0-bad
+go list -m -mod=mod -retracted -f '{{range .Retracted}}{{.}}{{end}}' example.com/retract
+stdout '^bad$'
+go list -m -mod=mod -retracted -f '{{with .Replace}}{{range .Retracted}}{{.}}{{end}}{{end}}' example.com/retract
+stdout '^bad$'
+
+-- go.mod --
+module m
+
+go 1.14
+
+require (
+	example.com/retract v1.0.0-good
+	example.com/retract/missingmod v1.0.0
+)
+-- use.go --
+package use
+
+import (
+	_ "example.com/retract"
+	_ "example.com/retract/missingmod"
+)
+-- missingmod-v1.0.0/go.mod --
+module example.com/retract/missingmod
+
+go 1.14
+-- missingmod-v1.9.0/go.mod --
+module example.com/retract/missingmod
+
+go 1.14
+
+// bad version
+retract v1.0.0
diff --git a/src/cmd/go/testdata/script/mod_run_path.txt b/src/cmd/go/testdata/script/mod_run_path.txt
new file mode 100644
index 0000000..4369ee4
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_run_path.txt
@@ -0,0 +1,15 @@
+# Test that go run does not get confused by conflict
+# between go.mod's module path and what you'd
+# expect from GOPATH. golang.org/issue/26046.
+
+env GO111MODULE=on
+
+cd $GOPATH/src/example.com/hello
+go run main.go
+
+-- $GOPATH/src/example.com/hello/go.mod --
+module example.com/hello/v2
+
+-- $GOPATH/src/example.com/hello/main.go --
+package main
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_std_vendor.txt b/src/cmd/go/testdata/script/mod_std_vendor.txt
new file mode 100644
index 0000000..fb954d7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_std_vendor.txt
@@ -0,0 +1,78 @@
+env GO111MODULE=on
+env GOPROXY=off
+
+[!gc] skip
+
+# 'go list' should report imports from _test.go in the TestImports field.
+go list -f '{{.TestImports}}'
+stdout net/http # from .TestImports
+
+# 'go list' should find standard-vendored packages.
+go list -f '{{.Dir}}' vendor/golang.org/x/net/http2/hpack
+stdout $GOROOT[/\\]src[/\\]vendor
+
+# 'go list -test' should report vendored transitive dependencies of _test.go
+# imports in the Deps field.
+go list -test -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}'
+stdout ^vendor/golang.org/x/crypto # dep of .TestImports
+
+
+# Modules outside the standard library should not use the packages vendored there...
+cd broken
+! go build -mod=readonly
+stderr 'disabled by -mod=readonly'
+! go build -mod=vendor
+stderr 'cannot find package'
+stderr 'hpack'
+
+# ...even if they explicitly use the "cmd/vendor/" or "vendor/" prefix.
+cd ../importcmd
+! go build .
+stderr 'use of vendored package'
+
+cd ../importstd
+! go build .
+stderr 'use of vendored package'
+
+
+# When run within the 'std' module, 'go list -test' should report vendored
+# transitive dependencies at their original module paths.
+cd $GOROOT/src
+go list -test -f '{{range .Deps}}{{.}}{{"\n"}}{{end}}' net/http
+stdout ^golang.org/x/net/http2/hpack
+! stdout ^vendor/golang.org/x/net/http2/hpack
+
+-- go.mod --
+module m
+
+-- x.go --
+package x
+
+-- x_test.go --
+package x
+import "testing"
+import _ "net/http"
+func Test(t *testing.T) {}
+
+-- broken/go.mod --
+module broken
+-- broken/http.go --
+package broken
+
+import (
+	_ "net/http"
+	_ "golang.org/x/net/http2/hpack"
+)
+
+-- importcmd/go.mod --
+module importcmd
+-- importcmd/x.go --
+package importcmd
+
+import _ "cmd/vendor/golang.org/x/tools/go/analysis"
+-- importstd/go.mod --
+module importvendor
+-- importstd/x.go --
+package importstd
+
+import _ "vendor/golang.org/x/net/http2/hpack"
diff --git a/src/cmd/go/testdata/script/mod_string_alias.txt b/src/cmd/go/testdata/script/mod_string_alias.txt
new file mode 100644
index 0000000..5c3d428
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_string_alias.txt
@@ -0,0 +1,14 @@
+[short] skip
+
+env GO111MODULE=on
+
+go mod init golang.org/issue/27584
+
+go build .
+
+-- main.go --
+package main
+
+type string = []int
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_sum_ambiguous.txt b/src/cmd/go/testdata/script/mod_sum_ambiguous.txt
new file mode 100644
index 0000000..07c6659
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sum_ambiguous.txt
@@ -0,0 +1,62 @@
+# Confirm our build list.
+cp go.sum.buildlist-only go.sum
+go list -m all
+stdout '^example.com/ambiguous/a v1.0.0$'
+stdout '^example.com/ambiguous/a/b v0.0.0-empty$'
+
+# If two modules could provide a package, but only one does,
+# 'go mod tidy' should retain sums for both zips.
+go mod tidy
+grep '^example.com/ambiguous/a v1.0.0 h1:' go.sum
+grep '^example.com/ambiguous/a/b v0.0.0-empty h1:' go.sum
+
+# 'go mod download' should also add sums.
+cp go.sum.buildlist-only go.sum
+go mod download example.com/ambiguous/a
+grep '^example.com/ambiguous/a v1.0.0 h1:' go.sum
+! grep '^example.com/ambiguous/a/b v0.0.0-empty h1:' go.sum
+go mod download example.com/ambiguous/a/b
+grep '^example.com/ambiguous/a/b v0.0.0-empty h1:' go.sum
+
+# If two modules could provide a package, and we're missing a sum for one,
+# we should see a missing sum error, even if we have a sum for a module that
+# provides the package.
+cp go.sum.a-only go.sum
+! go list example.com/ambiguous/a/b
+stderr '^missing go.sum entry needed to verify package example.com/ambiguous/a/b is provided by exactly one module; to add:\n\tgo mod download example.com/ambiguous/a/b$'
+! go list -deps .
+stderr '^use.go:3:8: missing go.sum entry needed to verify package example.com/ambiguous/a/b \(imported by m\) is provided by exactly one module; to add:\n\tgo get m$'
+
+cp go.sum.b-only go.sum
+! go list example.com/ambiguous/a/b
+stderr '^missing go.sum entry for module providing package example.com/ambiguous/a/b; to add:\n\tgo mod download example.com/ambiguous/a$'
+! go list -deps .
+stderr '^use.go:3:8: missing go.sum entry for module providing package example.com/ambiguous/a/b \(imported by m\); to add:\n\tgo get m$'
+
+cp go.sum.buildlist-only go.sum
+! go list example.com/ambiguous/a/b
+stderr '^missing go.sum entry for module providing package example.com/ambiguous/a/b; to add:\n\tgo mod download example.com/ambiguous/a example.com/ambiguous/a/b$'
+! go list -deps .
+stderr '^use.go:3:8: missing go.sum entry for module providing package example.com/ambiguous/a/b \(imported by m\); to add:\n\tgo get m$'
+
+-- go.mod --
+module m
+
+go 1.15
+
+require example.com/ambiguous/a v1.0.0
+-- go.sum.buildlist-only --
+example.com/ambiguous/a v1.0.0/go.mod h1:TrBl/3xTPFJ2gmMIYz53h2gkNtg0dokszEMuyS1QEb0=
+example.com/ambiguous/a/b v0.0.0-empty/go.mod h1:MajJq5jPEBnnXP+NTWIeXX7kwaPS1sbVEJdooTmsePQ=
+-- go.sum.a-only --
+example.com/ambiguous/a v1.0.0 h1:pGZhTXy6+titE2rNfwHwJykSjXDR4plO52PfZrBM0T8=
+example.com/ambiguous/a v1.0.0/go.mod h1:TrBl/3xTPFJ2gmMIYz53h2gkNtg0dokszEMuyS1QEb0=
+example.com/ambiguous/a/b v0.0.0-empty/go.mod h1:MajJq5jPEBnnXP+NTWIeXX7kwaPS1sbVEJdooTmsePQ=
+-- go.sum.b-only --
+example.com/ambiguous/a v1.0.0/go.mod h1:TrBl/3xTPFJ2gmMIYz53h2gkNtg0dokszEMuyS1QEb0=
+example.com/ambiguous/a/b v0.0.0-empty h1:xS29ReXXuhjT7jc79mo91h/PevaZ2oS9PciF1DucXtg=
+example.com/ambiguous/a/b v0.0.0-empty/go.mod h1:MajJq5jPEBnnXP+NTWIeXX7kwaPS1sbVEJdooTmsePQ=
+-- use.go --
+package use
+
+import _ "example.com/ambiguous/a/b"
diff --git a/src/cmd/go/testdata/script/mod_sum_lookup.txt b/src/cmd/go/testdata/script/mod_sum_lookup.txt
new file mode 100644
index 0000000..e021921
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sum_lookup.txt
@@ -0,0 +1,34 @@
+# When we attempt to resolve an import that doesn't exist, we should not save
+# hashes for downloaded modules.
+# Verifies golang.org/issue/36260.
+# TODO(golang.org/issue/26603): use 'go mod tidy -e' when implemented.
+go list -e -mod=mod -tags=ignore ./noexist
+! exists go.sum
+
+# When an import is resolved successfully, we should only save hashes for
+# the module that provides the package, not for other modules looked up.
+# Verifies golang.org/issue/31580.
+go get -d ./exist
+grep '^example.com/join v1.1.0 h1:' go.sum
+! grep '^example.com/join/subpkg' go.sum
+cp go.sum go.list.sum
+go mod tidy
+cmp go.sum go.list.sum
+
+-- go.mod --
+module m
+
+go 1.15
+
+-- noexist/use.go --
+// ignore tags prevents errors in 'go mod tidy'
+// +build ignore
+
+package use
+
+import _ "example.com/join/subpkg/noexist"
+
+-- exist/use.go --
+package use
+
+import _ "example.com/join/subpkg"
diff --git a/src/cmd/go/testdata/script/mod_sum_readonly.txt b/src/cmd/go/testdata/script/mod_sum_readonly.txt
new file mode 100644
index 0000000..57c5bbe
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sum_readonly.txt
@@ -0,0 +1,87 @@
+# Test that go.sum does not get updated when -mod=readonly flag is set
+env GO111MODULE=on
+
+# When a sum is needed to load the build list, we get an error for the
+# specific module. The .mod file is not downloaded, and go.sum is not written.
+! go list -m all
+stderr '^go: rsc.io/quote@v1.5.2: missing go.sum entry; to add it:\n\tgo mod download rsc.io/quote$'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
+! exists go.sum
+
+# If go.sum exists but contains hashes from an algorithm we don't know about,
+# we should see the same error.
+cp go.sum.h2only go.sum
+! go list -m all
+stderr '^go: rsc.io/quote@v1.5.2: missing go.sum entry; to add it:\n\tgo mod download rsc.io/quote$'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
+cmp go.sum go.sum.h2only
+rm go.sum
+
+# If we replace a module, we should see a missing sum error for the replacement.
+cp go.mod go.mod.orig
+go mod edit -replace rsc.io/quote@v1.5.2=rsc.io/quote@v1.5.1
+! go list -m all
+stderr '^go: rsc.io/quote@v1.5.2 \(replaced by rsc.io/quote@v1.5.1\): missing go.sum entry; to add it:\n\tgo mod download rsc.io/quote$'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.1.mod
+! exists go.sum
+cp go.mod.orig go.mod
+
+# Control: when sums are present, loading the build list downloads .mod files.
+cp go.sum.buildlistonly go.sum
+go list -m all
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.mod
+
+
+# When a sum is needed to load a .mod file for a package outside the build list,
+# we get a generic missing import error.
+! go list example.com/doesnotexist
+stderr '^no required module provides package example.com/doesnotexist; to add it:\n\tgo get example.com/doesnotexist$'
+
+# When a sum is needed to load a .zip file, we get a more specific error.
+# The .zip file is not downloaded.
+! go list rsc.io/quote
+stderr '^missing go.sum entry for module providing package rsc.io/quote; to add:\n\tgo mod download rsc.io/quote$'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+
+# The error is attached to the package from the missing module. We can load
+# a package that imports it without that error.
+go list -e -deps -f '{{.ImportPath}}{{with .Error}} {{.Err}}{{end}}' .
+stdout '^m$'
+stdout '^rsc.io/quote missing go.sum entry for module providing package rsc.io/quote \(imported by m\); to add:\n\tgo get m$'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+
+# go.sum should not have been written.
+cmp go.sum go.sum.buildlistonly
+
+# Control: when sums are present, 'go list' downloads .zip files.
+cp go.sum.tidy go.sum
+go list .
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.5.2.zip
+
+-- go.mod --
+module m
+
+go 1.15
+
+require rsc.io/quote v1.5.2
+-- use.go --
+package use
+
+import _ "rsc.io/quote"
+-- go.sum.h2only --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h2:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2/go.mod h2:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0/go.mod h2:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+-- go.sum.buildlistonly --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+-- go.sum.tidy --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.2 h1:3fEykkD9k7lYzXqCYrwGAf7iNhbk4yCjHmKBN9td4L0=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+rsc.io/testonly v1.0.0 h1:K/VWHdO+Jv7woUXG0GzVNx1czBXUt3Ib1deaMn+xk64=
+rsc.io/testonly v1.0.0/go.mod h1:OqmGbIFOcF+XrFReLOGZ6BhMM7uMBiQwZsyNmh74SzY=
diff --git a/src/cmd/go/testdata/script/mod_sum_replaced.txt b/src/cmd/go/testdata/script/mod_sum_replaced.txt
new file mode 100644
index 0000000..b03982d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sum_replaced.txt
@@ -0,0 +1,28 @@
+env GO111MODULE=on
+
+# After 'go get -d', the go.sum file should contain the sum for the module.
+go get -d rsc.io/quote@v1.5.0
+grep 'rsc.io/quote v1.5.0' go.sum
+
+# If we replace the module and run 'go mod tidy', we should get a sum for the replacement.
+go mod edit -replace rsc.io/quote@v1.5.0=rsc.io/quote@v1.5.1
+go mod tidy
+grep 'rsc.io/quote v1.5.1' go.sum
+cp go.sum go.sum.tidy
+
+# 'go mod vendor' should preserve that sum, and should not need to add any new entries.
+go mod vendor
+grep 'rsc.io/quote v1.5.1' go.sum
+cmp go.sum go.sum.tidy
+
+-- go.mod --
+module golang.org/issue/27868
+
+require rsc.io/quote v1.5.0
+
+-- main.go --
+package main
+
+import _ "rsc.io/quote"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_sumdb.txt b/src/cmd/go/testdata/script/mod_sumdb.txt
new file mode 100644
index 0000000..9a688e1
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sumdb.txt
@@ -0,0 +1,39 @@
+env GO111MODULE=on
+env sumdb=$GOSUMDB
+env proxy=$GOPROXY
+env GOPROXY GONOPROXY GOSUMDB GONOSUMDB
+env dbname=localhost.localdev/sumdb
+
+# disagreeing with the sumdb produces security errors
+# (this also populates tiles on the sumdb server).
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb' '$proxy/sumdb-wrong
+! go get -d rsc.io/quote
+stderr 'go get: rsc.io/quote@v1.5.2: verifying module: checksum mismatch'
+stderr 'downloaded: h1:3fEy'
+stderr 'localhost.localdev/sumdb: h1:wrong'
+stderr 'SECURITY ERROR\nThis download does NOT match the one reported by the checksum server.'
+! go get -d rsc.io/sampler
+! go get -d golang.org/x/text
+
+go mod edit -require rsc.io/quote@v1.5.2
+! go mod tidy
+stderr 'go: rsc.io/quote@v1.5.2: verifying go.mod: checksum mismatch'
+stderr 'SECURITY ERROR\n'
+
+rm go.sum
+
+# switching to truthful sumdb detects timeline inconsistency
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+! go get -d rsc.io/fortune
+stderr 'SECURITY ERROR\ngo.sum database server misbehavior detected!'
+stderr 'proof of misbehavior:'
+
+# removing the cached wrong tree head and cached tiles clears the bad data
+rm $GOPATH/pkg/sumdb/$dbname/latest
+go clean -modcache
+go get -d rsc.io/fortune
+
+-- go.mod.orig --
+module m
diff --git a/src/cmd/go/testdata/script/mod_sumdb_cache.txt b/src/cmd/go/testdata/script/mod_sumdb_cache.txt
new file mode 100644
index 0000000..2937b2e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sumdb_cache.txt
@@ -0,0 +1,54 @@
+env GO111MODULE=on
+env sumdb=$GOSUMDB
+env proxy=$GOPROXY
+env GOPROXY GONOPROXY GOSUMDB GONOSUMDB
+
+# rejected proxy fails verification
+cp go.mod.orig go.mod
+rm go.sum
+env GOPROXY=$proxy/sumdb-503
+! go get -d rsc.io/quote
+stderr 503
+
+# fetch through working proxy is OK
+cp go.mod.orig go.mod
+rm go.sum
+env GOPROXY=$proxy
+go get -d rsc.io/quote
+
+# repeated fetch works entirely from cache, does not consult sumdb
+cp go.mod.orig go.mod
+rm go.sum
+env GOPROXY=$proxy/sumdb-503
+go get -d rsc.io/quote
+rm go.sum
+
+# fetch specific module can work without proxy, using cache or go.sum
+cp go.mod.orig go.mod
+rm go.sum
+env GOPROXY=off
+go get -d rsc.io/quote@v1.5.2 # using cache
+rm $GOPATH/pkg/mod/cache/download/sumdb/localhost.localdev/sumdb/lookup/rsc.io/quote@v1.5.2
+go get -d rsc.io/quote@v1.5.2 # using go.sum
+
+# fetch fails once we lose access to both cache and go.sum
+rm go.sum
+env GOPROXY=$proxy/sumdb-504
+! go get -d rsc.io/quote@v1.5.2
+stderr 504
+
+# GOINSECURE does not bypass checksum lookup
+env GOINSECURE=rsc.io
+env GOPROXY=$proxy/sumdb-504
+! go get -d rsc.io/quote@v1.5.2
+stderr 504
+
+# but -insecure bypasses the checksum lookup entirely
+env GOINSECURE=
+go get -d -insecure rsc.io/quote@v1.5.2
+
+# and then it is in go.sum again
+go get -d rsc.io/quote@v1.5.2
+
+-- go.mod.orig --
+module m
diff --git a/src/cmd/go/testdata/script/mod_sumdb_file_path.txt b/src/cmd/go/testdata/script/mod_sumdb_file_path.txt
new file mode 100644
index 0000000..22fcbf3
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sumdb_file_path.txt
@@ -0,0 +1,56 @@
+[!net] skip
+
+env GO111MODULE=on
+env GOSUMDB=
+env GOPATH=$WORK/gopath1
+
+# With a file-based proxy with an empty checksum directory,
+# downloading a new module should fail, even if a subsequent
+# proxy contains a more complete mirror of the sum database.
+#
+# TODO(bcmills): The error message here is a bit redundant.
+# It comes from the sumweb package, which isn't yet producing structured errors.
+[windows] env GOPROXY=file:///$WORK/sumproxy,https://proxy.golang.org
+[!windows] env GOPROXY=file://$WORK/sumproxy,https://proxy.golang.org
+! go get -d golang.org/x/text@v0.3.2
+stderr '^go get: golang.org/x/text@v0.3.2: verifying module: golang.org/x/text@v0.3.2: reading file://.*/sumdb/sum.golang.org/lookup/golang.org/x/text@v0.3.2: (no such file or directory|.*cannot find the path specified.*)'
+
+# If the proxy does not claim to support the database,
+# checksum verification should fall through to the next proxy,
+# and downloading should succeed.
+[windows] env GOPROXY=file:///$WORK/emptyproxy,https://proxy.golang.org
+[!windows] env GOPROXY=file://$WORK/emptyproxy,https://proxy.golang.org
+go get -d golang.org/x/text@v0.3.2
+
+# After a successful sumdb lookup, the lookup can be repeated
+# using the download cache as a proxy.
+cp supported $GOPATH/pkg/mod/cache/download/sumdb/sum.golang.org/supported
+[windows] env GOPROXY=file:///$WORK/gopath1/pkg/mod/cache/download,file:///$WORK/sumproxy
+[!windows] env GOPROXY=file://$WORK/gopath1/pkg/mod/cache/download,file://$WORK/sumproxy
+env GOPATH=$WORK/gopath2
+rm go.sum
+go get -d -x -v golang.org/x/text@v0.3.2
+
+# Once the checksum is present in the go.sum file,
+# an empty file-based sumdb can be used in conjunction with
+# a fallback module mirror.
+grep golang.org/x/text go.sum
+env GOPATH=$WORK/gopath3
+[windows] env GOPROXY=file:///$WORK/sumproxy
+[!windows] env GOPROXY=file://$WORK/sumproxy
+! go get -d golang.org/x/text@v0.3.2
+[windows] env GOPROXY=file:///$WORK/sumproxy,https://proxy.golang.org
+[!windows] env GOPROXY=file://$WORK/sumproxy,https://proxy.golang.org
+go get -d golang.org/x/text@v0.3.2
+
+-- supported --
+
+-- go.mod --
+module example.com
+go 1.13
+-- $WORK/emptyproxy/README.md --
+This proxy contains no modules.
+-- $WORK/sumproxy/README.md --
+This proxy contains no modules.
+-- $WORK/sumproxy/sumdb/sum.golang.org/supported --
+This proxy blocks checksum downloads from sum.golang.org.
diff --git a/src/cmd/go/testdata/script/mod_sumdb_golang.txt b/src/cmd/go/testdata/script/mod_sumdb_golang.txt
new file mode 100644
index 0000000..cc0b0da
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sumdb_golang.txt
@@ -0,0 +1,54 @@
+# Test default GOPROXY and GOSUMDB
+env GOPROXY=
+env GOSUMDB=
+go env GOPROXY
+stdout '^https://proxy.golang.org,direct$'
+go env GOSUMDB
+stdout '^sum.golang.org$'
+env GOPROXY=https://proxy.golang.org
+go env GOSUMDB
+stdout '^sum.golang.org$'
+
+# Download direct from github.
+[!net] skip
+[!exec:git] skip
+env GOSUMDB=sum.golang.org
+env GOPROXY=direct
+go get -d rsc.io/quote@v1.5.2
+cp go.sum saved.sum
+
+# Download from proxy.golang.org with go.sum entry already.
+# Use 'go list' instead of 'go get' since the latter may download extra go.mod
+# files not listed in go.sum.
+go clean -modcache
+env GOSUMDB=
+env GOPROXY=
+go list -x -deps rsc.io/quote
+! stderr github
+stderr proxy.golang.org/rsc.io/quote
+! stderr sum.golang.org/tile
+! stderr sum.golang.org/lookup/rsc.io/quote
+cmp go.sum saved.sum
+
+# Download again.
+# Should use the checksum database to validate new go.sum lines,
+# but not need to fetch any new data from the proxy.
+rm go.sum
+go list -mod=mod -x rsc.io/quote
+! stderr github
+! stderr proxy.golang.org/rsc.io/quote
+stderr sum.golang.org/tile
+stderr sum.golang.org/lookup/rsc.io/quote
+cmp go.sum saved.sum
+
+# test fallback to direct
+env TESTGOPROXY404=1
+go clean -modcache
+rm go.sum
+go list -mod=mod -x rsc.io/quote
+stderr 'proxy.golang.org.*404 testing'
+stderr github.com/rsc
+cmp go.sum saved.sum
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/mod_sumdb_proxy.txt b/src/cmd/go/testdata/script/mod_sumdb_proxy.txt
new file mode 100644
index 0000000..70b8e3f
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_sumdb_proxy.txt
@@ -0,0 +1,65 @@
+env GO111MODULE=on
+env sumdb=$GOSUMDB
+env proxy=$GOPROXY
+env GOPROXY GONOPROXY GOSUMDB GONOSUMDB
+
+# basic fetch (through proxy) works
+cp go.mod.orig go.mod
+go get -d rsc.io/fortune@v1.0.0 # note: must use test proxy, does not exist in real world
+rm $GOPATH/pkg/mod/cache/download/sumdb # rm sumdb cache but NOT package download cache
+rm go.sum
+
+# can fetch by explicit URL
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb' '$proxy/sumdb-direct
+go get -d rsc.io/fortune@v1.0.0
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+# direct access fails (because localhost.localdev does not exist)
+# web.get is providing the error message - there's no actual network access.
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+env GOPROXY=direct
+! go get -d rsc.io/fortune@v1.0.0
+stderr 'verifying module: rsc.io/fortune@v1.0.0: .*: no such host localhost.localdev'
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+# proxy 404 falls back to direct access (which fails)
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+env GOPROXY=$proxy/sumdb-404
+! go get -d rsc.io/fortune@v1.0.0
+stderr 'verifying.*localhost.localdev'
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+# proxy non-200/404/410 stops direct access
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+env GOPROXY=$proxy/sumdb-503
+! go get -d rsc.io/fortune@v1.0.0
+stderr '503 Service Unavailable'
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+# the error from the last attempted proxy should be returned.
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+env GOPROXY=$proxy/sumdb-404,$proxy/sumdb-503
+! go get -d rsc.io/fortune@v1.0.0
+stderr '503 Service Unavailable'
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+# if proxies are separated with '|', fallback is allowed on any error.
+cp go.mod.orig go.mod
+env GOSUMDB=$sumdb
+env GOPROXY=$proxy/sumdb-503|https://0.0.0.0|$proxy
+go get -d rsc.io/fortune@v1.0.0
+rm $GOPATH/pkg/mod/cache/download/sumdb
+rm go.sum
+
+-- go.mod.orig --
+module m
diff --git a/src/cmd/go/testdata/script/mod_symlink.txt b/src/cmd/go/testdata/script/mod_symlink.txt
new file mode 100644
index 0000000..dbc23fb
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_symlink.txt
@@ -0,0 +1,45 @@
+env GO111MODULE=on
+[!symlink] skip
+
+# 'go get -d' should resolve modules of imported packages.
+go get -d
+go list -deps -f '{{.Module}}' .
+stdout golang.org/x/text
+
+go get -d ./subpkg
+go list -deps -f '{{.Module}}' ./subpkg
+stdout golang.org/x/text
+
+# Create a copy of the module using symlinks in src/links.
+mkdir links
+symlink links/go.mod -> $GOPATH/src/go.mod
+symlink links/go.sum -> $GOPATH/src/go.sum
+symlink links/issue.go -> $GOPATH/src/issue.go
+mkdir links/subpkg
+symlink links/subpkg/issue.go -> $GOPATH/src/subpkg/issue.go
+
+# We should see the copy as a valid module root.
+cd links
+go env GOMOD
+stdout links[/\\]go.mod
+go list -m
+stdout golang.org/issue/28107
+
+# The symlink-based copy should contain the same packages
+# and have the same dependencies as the original.
+go list -deps -f '{{.Module}}' .
+stdout golang.org/x/text
+go list -deps -f '{{.Module}}' ./subpkg
+stdout golang.org/x/text
+
+-- go.mod --
+module golang.org/issue/28107
+
+-- issue.go --
+package issue
+
+import _ "golang.org/x/text/language"
+-- subpkg/issue.go --
+package issue
+
+import _ "golang.org/x/text/language"
diff --git a/src/cmd/go/testdata/script/mod_symlink_dotgo.txt b/src/cmd/go/testdata/script/mod_symlink_dotgo.txt
new file mode 100644
index 0000000..d4cc143
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_symlink_dotgo.txt
@@ -0,0 +1,17 @@
+env GO111MODULE=on
+[!symlink] skip
+
+symlink dir.go -> dir
+
+# Issue #39841: symlinks to directories should be ignored, not treated as source files.
+go list -f '{{range .GoFiles}}{{.}}{{"\n"}}{{end}}' .
+stdout 'p\.go$'
+! stdout 'dir\.go$'
+
+-- go.mod --
+module example.com
+go 1.15
+-- p.go --
+package p
+-- dir/README.txt --
+This file exists to ensure that dir is a directory.
diff --git a/src/cmd/go/testdata/script/mod_tagged_import_cycle.txt b/src/cmd/go/testdata/script/mod_tagged_import_cycle.txt
new file mode 100644
index 0000000..0491acb
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tagged_import_cycle.txt
@@ -0,0 +1,106 @@
+# Because 'go mod' subcommands ignore build constraints, they can encounter
+# package-import cycles that are not possible in an ordinary build. This test
+# verifies that such cycles are handled even when they cross module boundaries.
+
+# First, verify that the import graph depends on build tags as expected.
+go list -deps example.com/left
+stdout '^example.com/right$'
+go list -deps example.com/right
+! stdout left
+
+env GOFLAGS=-tags=mirror
+go list -deps example.com/left
+! stdout right
+go list -deps example.com/right
+stdout '^example.com/left$'
+env GOFLAGS=''
+
+# 'go mod why' should be agnostic to build tags.
+go mod why example.com/left
+stdout '^example.com/chiral$\n^example.com/left$'
+go mod why example.com/right
+stdout '^example.com/chiral$\n^example.com/right$'
+
+env GOFLAGS='-tags=mirror'
+go mod why example.com/left
+stdout '^example.com/chiral$\n^example.com/left$'
+go mod why example.com/right
+stdout '^example.com/chiral$\n^example.com/right$'
+env GOFLAGS=''
+
+# 'go mod tidy' should successfully handle the cycle.
+env GOFLAGS=-mod=readonly
+go mod tidy
+
+# 'go mod vendor' should copy in both packages without crashing.
+go mod vendor
+exists vendor/example.com/left/default.go
+exists vendor/example.com/left/mirror.go
+exists vendor/example.com/right/default.go
+exists vendor/example.com/right/mirror.go
+
+-- go.mod --
+module example.com/chiral
+
+go 1.14
+
+require (
+	example.com/left v0.1.0
+	example.com/right v0.1.0
+)
+
+replace (
+	example.com/left => ./left
+	example.com/right => ./right
+)
+-- chiral.go --
+// Package chiral imports packages in an order that depends on build tags.
+package chiral
+-- default.go --
+// +build !mirror
+
+package chiral
+
+import _ "example.com/left"
+-- mirror.go --
+// +build mirror
+
+package chiral
+
+import _ "example.com/right"
+-- left/go.mod --
+module example.com/left
+
+go 1.14
+
+require example.com/right v0.1.0
+
+replace example.com/right v0.1.0 => ../right
+-- left/default.go --
+// +build !mirror
+
+package left
+
+import _ "example.com/right"
+-- left/mirror.go --
+// +build mirror
+
+package left
+-- right/go.mod --
+module example.com/right
+
+go 1.14
+
+require example.com/left v0.1.0
+
+replace example.com/left v0.1.0 => ../left
+-- right/default.go --
+// +build !mirror
+
+package right
+-- right/mirror.go --
+// +build mirror
+
+package right
+
+import _ "example.com/left"
diff --git a/src/cmd/go/testdata/script/mod_test.txt b/src/cmd/go/testdata/script/mod_test.txt
new file mode 100644
index 0000000..50f0035
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_test.txt
@@ -0,0 +1,128 @@
+env GO111MODULE=on
+env GOFLAGS=-mod=mod
+[short] skip
+
+# TODO(bcmills): Convert the 'go test' calls below to 'go list -test' once 'go
+# list' is more sensitive to package loading errors.
+
+# A test in the module's root package should work.
+cd a/
+cp go.mod.empty go.mod
+go list -test
+! stderr error
+
+cp go.mod.empty go.mod
+go list -deps
+! stdout ^testing$
+
+# list all should include test dependencies, like testing
+cp go.mod.empty go.mod
+go list all
+stdout ^testing$
+stdout ^rsc.io/quote$
+stdout ^rsc.io/testonly$
+
+# list -deps -tests should also include testing
+# but not deps of tests of deps (rsc.io/testonly).
+go list -deps -test
+stdout ^testing$
+stdout ^rsc.io/quote$
+! stdout ^rsc.io/testonly$
+
+# list -test all should succeed
+cp go.mod.empty go.mod
+go list -test all
+stdout '^testing'
+
+cp go.mod.empty go.mod
+go list -test
+! stderr error
+
+# A test with the "_test" suffix in the module root should also work.
+cd ../b/
+go list -test
+! stderr error
+
+# A test with the "_test" suffix of a *package* with a "_test" suffix should
+# even work (not that you should ever do that).
+cd ../c_test
+go list -test
+! stderr error
+
+cd ../d_test
+go list -test
+! stderr error
+
+cd ../e
+go list -test
+! stderr error
+
+-- a/go.mod.empty --
+module example.com/user/a
+
+-- a/a.go --
+package a
+
+-- a/a_test.go --
+package a
+
+import "testing"
+import _ "rsc.io/quote"
+
+func Test(t *testing.T) {}
+
+-- b/go.mod --
+module example.com/user/b
+
+-- b/b.go --
+package b
+
+-- b/b_test.go --
+package b_test
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+-- c_test/go.mod --
+module example.com/c_test
+
+-- c_test/umm.go --
+// Package c_test is the non-test package for its import path!
+package c_test
+
+-- c_test/c_test_test.go --
+package c_test_test
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+-- d_test/go.mod --
+// Package d is an ordinary package in a deceptively-named directory.
+module example.com/d
+
+-- d_test/d.go --
+package d
+
+-- d_test/d_test.go --
+package d_test
+
+import "testing"
+
+func Test(t *testing.T) {}
+
+-- e/go.mod --
+module example.com/e_test
+
+-- e/wat.go --
+// Package e_test is the non-test package for its import path,
+// in a deceptively-named directory!
+package e_test
+
+-- e/e_test.go --
+package e_test_test
+
+import "testing"
+
+func Test(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/mod_test_cached.txt b/src/cmd/go/testdata/script/mod_test_cached.txt
new file mode 100644
index 0000000..3da4358
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_test_cached.txt
@@ -0,0 +1,76 @@
+[short] skip
+
+env GO111MODULE=on
+env GOCACHE=$WORK/gocache
+env GODEBUG=gocachetest=1
+
+# The first run of a test should not be cached.
+# The second run should be.
+go test -run=WriteTmp .
+! stdout '(cached)'
+go test -run=WriteTmp .
+stdout '(cached)'
+
+# 'go test' without arguments should never be cached.
+go test -run=WriteTmp
+! stdout '(cached)'
+go test -run=WriteTmp
+! stdout '(cached)'
+
+# We should never cache a test run from command-line files.
+go test -run=WriteTmp ./foo_test.go
+! stdout '(cached)'
+go test -run=WriteTmp ./foo_test.go
+! stdout '(cached)'
+
+[!exec:sleep] stop
+# The go command refuses to cache access to files younger than 2s, so sleep that long.
+exec sleep 2
+
+# Touching a file that the test reads from within its testdata should invalidate the cache.
+go test -run=ReadTestdata .
+! stdout '(cached)'
+go test -run=ReadTestdata .
+stdout '(cached)'
+cp testdata/bar.txt testdata/foo.txt
+go test -run=ReadTestdata .
+! stdout '(cached)'
+
+-- go.mod --
+module golang.org/issue/29111/foo
+
+-- foo.go --
+package foo
+
+-- testdata/foo.txt --
+foo
+-- testdata/bar.txt --
+bar
+
+-- foo_test.go --
+package foo_test
+
+import (
+	"os"
+	"path/filepath"
+	"testing"
+)
+
+func TestWriteTmp(t *testing.T) {
+	dir, err := os.MkdirTemp("", "")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer os.RemoveAll(dir)
+	err = os.WriteFile(filepath.Join(dir, "x"), nil, 0666)
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestReadTestdata(t *testing.T) {
+	_, err := os.ReadFile("testdata/foo.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+}
diff --git a/src/cmd/go/testdata/script/mod_test_files.txt b/src/cmd/go/testdata/script/mod_test_files.txt
new file mode 100644
index 0000000..6f520c7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_test_files.txt
@@ -0,0 +1,50 @@
+env GO111MODULE=on
+
+cd foo
+
+# Testing an explicit source file should use the same import visibility as the
+# package in the same directory.
+go list -test -deps
+go list -test -deps foo_test.go
+
+# If the file is inside the main module's vendor directory, it should have
+# visibility based on the vendor-relative import path.
+mkdir vendor/example.com/foo
+cp foo_test.go vendor/example.com/foo
+go list -test -deps vendor/example.com/foo/foo_test.go
+
+# If the file is outside the main module entirely, it should be treated as outside.
+cp foo_test.go ../foo_test.go
+! go list -test -deps ../foo_test.go
+stderr 'use of internal package'
+
+-- foo/go.mod --
+module example.com/foo
+go 1.12
+require example.com/internal v0.0.0
+replace example.com/internal => ../internal
+
+-- foo/internal.go --
+package foo
+import _ "example.com/internal"
+
+-- foo/foo_test.go --
+package foo_test
+
+import (
+	"testing"
+	"example.com/internal"
+)
+
+func TestHacksEnabled(t *testing.T) {
+	if !internal.Hacks {
+		t.Fatal("hacks not enabled")
+	}
+}
+
+-- internal/go.mod --
+module example.com/internal
+
+-- internal/internal.go --
+package internal
+const Hacks = true
diff --git a/src/cmd/go/testdata/script/mod_tidy.txt b/src/cmd/go/testdata/script/mod_tidy.txt
new file mode 100644
index 0000000..b1d9371
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy.txt
@@ -0,0 +1,72 @@
+env GO111MODULE=on
+
+# tidy removes unused y, but everything else is used
+go mod tidy -v
+stderr '^unused y.1'
+! stderr '^unused [^y]'
+
+grep 'go 1.10' go.mod
+
+go list -m all
+! stdout '^y'
+stdout '^w.1 v1.2.0'
+stdout '^z.1 v1.2.0'
+
+# empty tidy should not crash
+cd triv
+! grep 'go ' go.mod
+go mod tidy
+
+# tidy should add missing go line
+grep 'go ' go.mod
+
+-- go.mod --
+module m
+
+go 1.10
+
+require (
+	x.1 v1.0.0
+	y.1 v1.0.0
+	w.1 v1.2.0
+)
+
+replace x.1 v1.0.0 => ./x
+replace y.1 v1.0.0 => ./y
+replace z.1 v1.1.0 => ./z
+replace z.1 v1.2.0 => ./z
+replace w.1 => ./w
+
+-- m.go --
+package m
+
+import _ "x.1"
+import _ "z.1/sub"
+
+-- w/go.mod --
+module w
+
+-- w/w.go --
+package w
+
+-- x/go.mod --
+module x
+require w.1 v1.1.0
+require z.1 v1.1.0
+
+-- x/x.go --
+package x
+import _ "w.1"
+
+-- y/go.mod --
+module y
+require z.1 v1.2.0
+
+-- z/go.mod --
+module z
+
+-- z/sub/sub.go --
+package sub
+
+-- triv/go.mod --
+module triv
diff --git a/src/cmd/go/testdata/script/mod_tidy_cycle.txt b/src/cmd/go/testdata/script/mod_tidy_cycle.txt
new file mode 100644
index 0000000..e46f37d
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_cycle.txt
@@ -0,0 +1,75 @@
+# Regression test for https://golang.org/issue/34086:
+# 'go mod tidy' produced different go.mod file from other
+# subcommands when certain kinds of cycles were present
+# in the build graph.
+
+env GO111MODULE=on
+
+cp go.mod go.mod.orig
+go mod tidy
+cmp go.mod go.mod.orig
+
+# If the go.mod file is already tidy, 'go mod graph' should not modify it.
+go mod graph
+cmp go.mod go.mod.orig
+
+-- go.mod --
+module root
+
+go 1.13
+
+replace (
+	a v0.1.0 => ./a1
+	b v0.1.0 => ./b1
+	b v0.2.0 => ./b2
+	c v0.1.0 => ./c1
+	c v0.2.0 => ./c2
+)
+
+require (
+	a v0.1.0
+	b v0.2.0 // indirect
+)
+-- main.go --
+package main
+
+import _ "a"
+
+func main() {}
+
+-- a1/go.mod --
+module a
+
+go 1.13
+
+require b v0.1.0
+-- a1/a.go --
+package a
+
+import _ "c"
+-- b1/go.mod --
+module b
+
+go 1.13
+
+require c v0.1.0
+-- b2/go.mod --
+module b
+
+go 1.13
+
+require c v0.2.0
+-- c1/go.mod --
+module c
+
+go 1.13
+-- c2/c.go --
+package c
+-- c2/go.mod --
+module c
+
+go 1.13
+
+require b v0.2.0
+-- c2/c.go --
+package c
diff --git a/src/cmd/go/testdata/script/mod_tidy_error.txt b/src/cmd/go/testdata/script/mod_tidy_error.txt
new file mode 100644
index 0000000..395537b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_error.txt
@@ -0,0 +1,39 @@
+env GO111MODULE=on
+
+# Regression test for golang.org/issue/27063:
+# 'go mod tidy' and 'go mod vendor' should not hide loading errors.
+
+! go mod tidy
+! stderr 'package nonexist is not in GOROOT'
+stderr '^issue27063 imports\n\tnonexist.example.com: cannot find module providing package nonexist.example.com'
+stderr '^issue27063 imports\n\tissue27063/other imports\n\tother.example.com/nonexist: cannot find module providing package other.example.com/nonexist'
+
+! go mod vendor
+! stderr 'package nonexist is not in GOROOT'
+stderr '^issue27063 imports\n\tnonexist.example.com: cannot find module providing package nonexist.example.com'
+stderr '^issue27063 imports\n\tissue27063/other imports\n\tother.example.com/nonexist: cannot find module providing package other.example.com/nonexist'
+
+-- go.mod --
+module issue27063
+
+go 1.13
+
+require issue27063/other v0.0.0
+replace issue27063/other => ./other
+-- x.go --
+package main
+
+import (
+	"nonexist"
+
+	"nonexist.example.com"
+	"issue27063/other"
+)
+
+func main() {}
+-- other/go.mod --
+module issue27063/other
+-- other/other.go --
+package other
+
+import "other.example.com/nonexist"
diff --git a/src/cmd/go/testdata/script/mod_tidy_old.txt b/src/cmd/go/testdata/script/mod_tidy_old.txt
new file mode 100644
index 0000000..7428f0c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_old.txt
@@ -0,0 +1,46 @@
+# 'go mod tidy' should remove content sums for module versions that aren't
+# in the build list. It should preserve go.mod sums for module versions that
+# are in the module graph though.
+# Verifies golang.org/issue/33008.
+go mod tidy
+! grep '^rsc.io/quote v1.5.0 h1:' go.sum
+grep '^rsc.io/quote v1.5.0/go.mod h1:' go.sum
+
+-- go.mod --
+module m
+
+go 1.15
+
+require (
+	rsc.io/quote v1.5.2
+	example.com/r v0.0.0
+)
+
+replace example.com/r => ./r
+
+-- go.sum --
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c h1:pvCbr/wm8HzDD3fVywevekufpn6tCGPY3spdHeZJEsw=
+golang.org/x/text v0.0.0-20170915032832-14c0d48ead0c/go.mod h1:NqM8EUOU14njkJ3fqMW+pc6Ldnwhi/IjpwHt7yyuwOQ=
+rsc.io/quote v1.5.0 h1:6fJa6E+wGadANKkUMlZ0DhXFpoKlslOQDCo259XtdIE=
+rsc.io/quote v1.5.0/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/quote v1.5.2 h1:3fEykkD9k7lYzXqCYrwGAf7iNhbk4yCjHmKBN9td4L0=
+rsc.io/quote v1.5.2/go.mod h1:LzX7hefJvL54yjefDEDHNONDjII0t9xZLPXsUe+TKr0=
+rsc.io/sampler v1.3.0 h1:HLGR/BgEtI3r0uymSP/nl2uPLsUnNJX8toRyhfpBTII=
+rsc.io/sampler v1.3.0/go.mod h1:T1hPZKmBbMNahiBKFy5HrXp6adAjACjK9JXDnKaTXpA=
+rsc.io/testonly v1.0.0 h1:K/VWHdO+Jv7woUXG0GzVNx1czBXUt3Ib1deaMn+xk64=
+rsc.io/testonly v1.0.0/go.mod h1:OqmGbIFOcF+XrFReLOGZ6BhMM7uMBiQwZsyNmh74SzY=
+
+-- r/go.mod --
+module example.com/r
+
+require rsc.io/quote v1.5.0
+
+-- use.go --
+package use
+
+import _ "example.com/r"
+
+-- r/use.go --
+package use
+
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_tidy_quote.txt b/src/cmd/go/testdata/script/mod_tidy_quote.txt
new file mode 100644
index 0000000..423c7c2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_quote.txt
@@ -0,0 +1,26 @@
+# Check that mod tidy does not introduce repeated
+# require statements when input go.mod has quoted requirements.
+env GO111MODULE=on
+
+go mod tidy
+grep -count=1 rsc.io/quote go.mod
+
+cp go.mod2 go.mod
+go mod tidy
+grep -count=1 rsc.io/quote go.mod
+
+
+-- go.mod --
+module x
+
+-- x.go --
+package x
+import "rsc.io/quote"
+func main() { _ = quote.Hello }
+
+-- go.mod2 --
+module x
+require (
+	"rsc.io/sampler" v1.3.0
+	"rsc.io/quote" v1.5.2
+)
diff --git a/src/cmd/go/testdata/script/mod_tidy_replace.txt b/src/cmd/go/testdata/script/mod_tidy_replace.txt
new file mode 100644
index 0000000..dd99438
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_replace.txt
@@ -0,0 +1,138 @@
+env GO111MODULE=on
+env GOFLAGS=-mod=mod
+[short] skip
+
+# golang.org/issue/30166: 'go mod tidy' should not crash if a replaced module is
+# involved in a cycle.
+cd cycle
+env GOTRACEBACK=off
+go mod tidy
+cd ..
+
+# From inside the module, 'go list -m all' should NOT include transitive
+# requirements of modules that have been replaced.
+go list -m all
+stdout 'rsc.io/quote/v3 v3.0.0'
+! stdout 'rsc.io/sampler'
+! stdout 'golang.org/x/text'
+
+# From outside the module, 'go list -m all' should include them.
+cd outside
+go list -m all
+stdout 'rsc.io/quote/v3 v3.0.0'
+stdout 'rsc.io/sampler v1.3.0'
+stdout 'golang.org/x/text'
+cd ..
+
+# 'go list all' should add indirect requirements to satisfy the packages
+# imported from replacement modules.
+! grep 'rsc.io/sampler' go.mod
+! grep 'golang.org/x/text' go.mod
+go list all
+grep 'rsc.io/sampler' go.mod
+grep 'golang.org/x/text' go.mod
+
+# 'go get' and 'go mod tidy' should follow the requirements of the replacements,
+# not the originals, even if that results in a set of versions that are
+# misleading or redundant without those replacements.
+go get -d rsc.io/sampler@v1.2.0
+go mod tidy
+go list -m all
+stdout 'rsc.io/quote/v3 v3.0.0'
+stdout 'rsc.io/sampler v1.2.0'
+stdout 'golang.org/x/text'
+
+# The requirements seen from outside may be higher (or lower)
+# than those seen from within the module.
+grep 'rsc.io/sampler v1.2.0' go.mod
+cd outside
+go list -m all
+stdout 'rsc.io/sampler v1.3.0'
+cd ..
+
+# The same module can't be used as two different paths.
+cd multiple-paths
+! go mod tidy
+stderr 'rsc.io/quote/v3@v3.0.0 used for two different module paths \(not-rsc.io/quote/v3 and rsc.io/quote/v3\)'
+
+-- go.mod --
+module example.com/tidy
+
+require rsc.io/quote/v3 v3.0.0
+replace rsc.io/quote/v3 => ./not-rsc.io/quote/v3
+
+-- imports.go --
+package tidy
+
+import _ "rsc.io/quote/v3"
+
+-- outside/go.mod --
+module example.com/tidy/outside
+
+require example.com/tidy v0.0.0
+replace example.com/tidy => ./..
+
+-- not-rsc.io/quote/v3/go.mod --
+module not-rsc.io/quote/v3
+
+// No requirements specified!
+
+-- not-rsc.io/quote/v3/quote.go --
+package quote
+
+import (
+	_ "rsc.io/sampler"
+	_ "golang.org/x/text/language"
+)
+
+-- cycle/go.mod --
+module golang.org/issue/30166
+
+require (
+	golang.org/issue/30166/a v0.0.0
+	golang.org/issue/30166/b v0.0.0
+)
+
+replace (
+	golang.org/issue/30166/a => ./a
+	golang.org/issue/30166/b => ./b
+)
+-- cycle/cycle.go --
+package cycle
+
+import (
+	_ "golang.org/issue/30166/a"
+	_ "golang.org/issue/30166/b"
+)
+-- cycle/a/a.go --
+package a
+-- cycle/a/go.mod --
+module golang.org/issue/30166/a
+
+require golang.org/issue/30166/b v0.0.0
+-- cycle/b/b.go --
+package b
+-- cycle/b/go.mod --
+module golang.org/issue/30166/b
+
+require golang.org/issue/30166/a v0.0.0
+-- multiple-paths/main.go --
+package main
+
+import (
+	"fmt"
+	"rsc.io/quote/v3"
+)
+
+func main() {
+	fmt.Println(quote.GoV3())
+}
+-- multiple-paths/go.mod --
+module quoter
+
+require (
+	rsc.io/quote/v3 v3.0.0
+	not-rsc.io/quote/v3 v3.0.0
+)
+
+replace not-rsc.io/quote/v3 => rsc.io/quote/v3 v3.0.0
diff --git a/src/cmd/go/testdata/script/mod_tidy_sum.txt b/src/cmd/go/testdata/script/mod_tidy_sum.txt
new file mode 100644
index 0000000..c583f56
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_sum.txt
@@ -0,0 +1,33 @@
+env GO111MODULE=on
+
+# go.sum should list directly used modules and dependencies
+go get -d rsc.io/quote@v1.5.2
+go mod tidy
+grep rsc.io/sampler go.sum
+
+# go.sum should not normally lose old entries
+go get -d rsc.io/quote@v1.0.0
+grep 'rsc.io/quote v1.0.0' go.sum
+grep 'rsc.io/quote v1.5.2' go.sum
+grep rsc.io/sampler go.sum
+
+# go mod tidy should clear dead entries from go.sum
+go mod tidy
+grep 'rsc.io/quote v1.0.0' go.sum
+! grep 'rsc.io/quote v1.5.2' go.sum
+! grep rsc.io/sampler go.sum
+
+# go.sum with no entries is OK to keep
+# (better for version control not to delete and recreate.)
+cp x.go.noimports x.go
+go mod tidy
+exists go.sum
+! grep . go.sum
+
+-- go.mod --
+module x
+-- x.go --
+package x
+import _ "rsc.io/quote"
+-- x.go.noimports --
+package x
diff --git a/src/cmd/go/testdata/script/mod_tidy_too_new.txt b/src/cmd/go/testdata/script/mod_tidy_too_new.txt
new file mode 100644
index 0000000..ca3163e
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_tidy_too_new.txt
@@ -0,0 +1,48 @@
+# https://golang.org/issue/46142: 'go mod tidy' should error out if the version
+# in the go.mod file is newer than the most recent supported version.
+
+cp go.mod go.mod.orig
+
+
+# If the go.mod file specifies an unsupported Go version, 'go mod tidy' should
+# refuse to edit it: we don't know what a tidy go.mod file for that version
+# would look like.
+
+! go mod tidy
+stderr 'go mod tidy: go.mod file indicates go 2000.0, but maximum supported version is '$goversion'$'
+cmp go.mod go.mod.orig
+
+
+# The -e flag should push past the error and edit the file anyway,
+# but preserve the too-high version.
+
+cp go.mod.orig go.mod
+go mod tidy -e
+stderr 'go mod tidy: go.mod file indicates go 2000.0, but maximum supported version is '$goversion'$'
+cmp go.mod go.mod.tidy
+
+
+-- go.mod --
+module example.net/from/the/future
+
+go 2000.0
+
+replace example.net/m v0.0.0 => ./m
+-- go.mod.tidy --
+module example.net/from/the/future
+
+go 2000.0
+
+replace example.net/m v0.0.0 => ./m
+
+require example.net/m v0.0.0
+-- x.go --
+package x
+
+import "example.net/m"
+-- m/go.mod --
+module example.net/m
+
+go 1.17
+-- m/m.go --
+package m
diff --git a/src/cmd/go/testdata/script/mod_upgrade_patch.txt b/src/cmd/go/testdata/script/mod_upgrade_patch.txt
new file mode 100644
index 0000000..8b34f8b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_upgrade_patch.txt
@@ -0,0 +1,110 @@
+env GO111MODULE=on
+[short] skip
+
+# Initially, we are at v1.0.0 for all dependencies.
+go get -d
+cp go.mod go.mod.orig
+go list -m all
+stdout '^patch.example.com/direct v1.0.0'
+stdout '^patch.example.com/indirect v1.0.0'
+! stdout '^patch.example.com/depofdirectpatch'
+
+# @patch should be rejected for modules not already in the build list.
+! go get -d patch.example.com/depofdirectpatch@patch
+stderr '^go get: can''t query version "patch" of module patch.example.com/depofdirectpatch: no existing version is required$'
+cmp go.mod.orig go.mod
+
+# get -u=patch, with no arguments, should patch-update all dependencies
+# of the package in the current directory, pulling in transitive dependencies
+# and also patching those.
+cp go.mod.orig go.mod
+go get -d -u=patch
+go list -m all
+stdout '^patch.example.com/direct v1.0.1'
+stdout '^patch.example.com/indirect v1.0.1'
+stdout '^patch.example.com/depofdirectpatch v1.0.0'
+
+# 'get all@patch' should patch the modules that provide packages in 'all'.
+cp go.mod.orig go.mod
+go get -d all@patch
+go list -m all
+stdout '^patch.example.com/direct v1.0.1'
+stdout '^patch.example.com/indirect v1.0.1'
+stdout '^patch.example.com/depofdirectpatch v1.0.0'
+
+# ...but 'all@patch' should fail if any of the affected modules do not already
+# have a selected version.
+cp go.mod.orig go.mod
+go mod edit -droprequire=patch.example.com/direct
+cp go.mod go.mod.dropped
+! go get -d all@patch
+stderr '^go get all@patch: can''t query version "patch" of module patch.example.com/direct: no existing version is required$'
+cmp go.mod.dropped go.mod
+
+# Requesting the direct dependency with -u=patch but without an explicit version
+# should patch-update it and its dependencies.
+cp go.mod.orig go.mod
+go get -d -u=patch patch.example.com/direct
+go list -m all
+stdout '^patch.example.com/direct v1.0.1'
+stdout '^patch.example.com/indirect v1.0.1'
+stdout '^patch.example.com/depofdirectpatch v1.0.0'
+
+# Requesting only the indirect dependency should not update the direct one.
+cp go.mod.orig go.mod
+go get -d -u=patch patch.example.com/indirect
+go list -m all
+stdout '^patch.example.com/direct v1.0.0'
+stdout '^patch.example.com/indirect v1.0.1'
+! stdout '^patch.example.com/depofdirectpatch'
+
+# @patch should apply only to the specific module,
+# but the result must reflect its upgraded requirements.
+cp go.mod.orig go.mod
+go get -d patch.example.com/direct@patch
+go list -m all
+stdout '^patch.example.com/direct v1.0.1'
+stdout '^patch.example.com/indirect v1.0.0'
+stdout '^patch.example.com/depofdirectpatch v1.0.0'
+
+# An explicit @patch should override a general -u.
+cp go.mod.orig go.mod
+go get -d -u patch.example.com/direct@patch
+go list -m all
+stdout '^patch.example.com/direct v1.0.1'
+stdout '^patch.example.com/indirect v1.1.0'
+stdout '^patch.example.com/depofdirectpatch v1.0.0'
+
+# An explicit @latest should override a general -u=patch.
+cp go.mod.orig go.mod
+go get -d -u=patch patch.example.com/direct@latest
+go list -m all
+stdout '^patch.example.com/direct v1.1.0'
+stdout '^patch.example.com/indirect v1.0.1'
+! stdout '^patch.example.com/depofdirectpatch'
+
+# Standard library packages cannot be upgraded explicitly.
+cp go.mod.orig go.mod
+! go get cmd/vet@patch
+stderr 'go get: can''t request explicit version "patch" of standard library package cmd/vet$'
+
+# However, standard-library packages without explicit versions are fine.
+go get -d -u=patch -d cmd/go
+
+# We can upgrade to a new version of a module with no root package.
+go get -d example.com/noroot@v1.0.0
+go list -m all
+stdout '^example.com/noroot v1.0.0$'
+go get -d example.com/noroot@patch
+go list -m all
+stdout '^example.com/noroot v1.0.1$'
+
+
+-- go.mod --
+module x
+
+require patch.example.com/direct v1.0.0
+
+-- main.go --
+package x
+import _ "patch.example.com/direct"
diff --git a/src/cmd/go/testdata/script/mod_vcs_missing.txt b/src/cmd/go/testdata/script/mod_vcs_missing.txt
new file mode 100644
index 0000000..f8be43c
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vcs_missing.txt
@@ -0,0 +1,28 @@
+[exec:bzr] skip 'tests NOT having bzr'
+[!net] skip
+
+env GO111MODULE=on
+env GOPROXY=direct
+
+cd empty
+! go get -d launchpad.net/gocheck
+stderr '"bzr": executable file not found'
+cd ..
+
+# 1.11 used to give the cryptic error "cannot find module for path" here, but
+# only for a main package.
+cd main
+! go build -mod=mod
+stderr '"bzr": executable file not found'
+cd ..
+
+-- empty/go.mod --
+module m
+-- main/go.mod --
+module m
+-- main/main.go --
+package main
+
+import _ "launchpad.net/gocheck"
+
+func main() {}
diff --git a/src/cmd/go/testdata/script/mod_vendor.txt b/src/cmd/go/testdata/script/mod_vendor.txt
new file mode 100644
index 0000000..2622916
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor.txt
@@ -0,0 +1,312 @@
+env GO111MODULE=on
+
+# Without vendoring, a build should succeed unless -mod=vendor is set.
+[!short] go build
+[!short] ! go build -mod=vendor
+
+# Without vendoring, 'go list' should report the replacement directory for
+# a package in a replaced module.
+go list -f {{.Dir}} x
+stdout 'src[\\/]x'
+
+# 'go mod vendor' should copy all replaced modules to the vendor directory.
+go mod vendor -v
+stderr '^# x v1.0.0 => ./x'
+stderr '^x'
+stderr '^# y v1.0.0 => ./y'
+stderr '^y'
+stderr '^# z v1.0.0 => ./z'
+stderr '^z'
+! stderr '^w'
+grep 'a/foo/bar/b\na/foo/bar/c' vendor/modules.txt # must be sorted
+
+# An explicit '-mod=mod' should ignore the vendor directory.
+go list -mod=mod -f {{.Dir}} x
+stdout 'src[\\/]x'
+
+go list -mod=mod -f {{.Dir}} -m x
+stdout 'src[\\/]x'
+
+# An explicit '-mod=vendor' should report package directories within
+# the vendor directory.
+go list -mod=vendor -f {{.Dir}} x
+stdout 'src[\\/]vendor[\\/]x'
+
+# 'go list -mod=vendor -m' should successfully list vendored modules,
+# but should not provide a module directory because no directory contains
+# the complete module.
+go list -mod=vendor -f '{{.Version}} {{.Dir}}' -m x
+stdout '^v1.0.0 $'
+
+# -mod=vendor should cause 'go list' flags that look up versions to fail.
+! go list -mod=vendor -versions -m x
+stderr '^go list -m: can''t determine available versions using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)$'
+! go list -mod=vendor -u -m x
+stderr '^go list -m: can''t determine available upgrades using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)$'
+
+# 'go list -mod=vendor -m' on a transitive dependency that does not
+# provide vendored packages should give a helpful error rather than
+# 'not a known dependency'.
+! go list -mod=vendor -f '{{.Version}} {{.Dir}}' -m diamondright
+stderr 'go list -m: module diamondright: can''t resolve module using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+# 'go list -mod=mod' should report packages outside the import graph,
+# but 'go list -mod=vendor' should error out for them.
+go list -mod=mod -f {{.Dir}} w
+stdout 'src[\\/]w'
+! go list -mod=vendor -f {{.Dir}} w
+stderr 'src[\\/]vendor[\\/]w'
+
+go list -mod=mod -f {{.Dir}} diamondright
+stdout 'src[\\/]diamondright'
+
+# Test dependencies should not be copied.
+! exists vendor/x/testdata
+! exists vendor/a/foo/bar/b/ignored.go
+! exists vendor/a/foo/bar/b/main_test.go
+
+# Licenses and other metadata for each module should be copied
+# if any package within their module is copied.
+exists vendor/a/foo/AUTHORS.txt
+exists vendor/a/foo/CONTRIBUTORS
+exists vendor/a/foo/LICENSE
+exists vendor/a/foo/PATENTS
+exists vendor/a/foo/COPYING
+exists vendor/a/foo/COPYLEFT
+exists vendor/x/NOTICE!
+exists vendor/mysite/myname/mypkg/LICENSE.txt
+
+! exists vendor/a/foo/licensed-to-kill
+! exists vendor/w
+! exists vendor/w/LICENSE
+! exists vendor/x/x2
+! exists vendor/x/x2/LICENSE
+
+[short] stop
+
+# 'go build' and 'go test' using vendored packages should succeed.
+go build -mod=mod
+go build -mod=vendor
+go test -mod=vendor . ./subdir
+go test -mod=vendor ./...
+go fmt -mod=vendor ./...
+
+-- go.mod --
+module m
+
+go 1.13
+
+require (
+	a v1.0.0
+	diamondroot v0.0.0
+	mysite/myname/mypkg v1.0.0
+	w v1.0.0 // indirect
+	x v1.0.0
+	y v1.0.0
+	z v1.0.0
+)
+
+replace (
+	a v1.0.0 => ./a
+	diamondleft => ./diamondleft
+	diamondpoint => ./diamondpoint
+	diamondright => ./diamondright
+	diamondroot => ./diamondroot
+	mysite/myname/mypkg v1.0.0 => ./mypkg
+	w v1.0.0 => ./w
+	x v1.0.0 => ./x
+	y v1.0.0 => ./y
+	z v1.0.0 => ./z
+)
+
+-- a/foo/AUTHORS.txt --
+-- a/foo/CONTRIBUTORS --
+-- a/foo/LICENSE --
+-- a/foo/PATENTS --
+-- a/foo/COPYING --
+-- a/foo/COPYLEFT --
+-- a/foo/licensed-to-kill --
+-- w/LICENSE --
+-- x/NOTICE! --
+-- x/x2/LICENSE --
+-- mypkg/LICENSE.txt --
+
+-- a/foo/bar/b/main.go --
+package b
+-- a/foo/bar/b/ignored.go --
+// This file is intended for use with "go run"; it isn't really part of the package.
+
+// +build ignore
+
+package main
+
+func main() {}
+-- a/foo/bar/b/main_test.go --
+package b
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("../testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/foo/bar/c/main.go --
+package c
+import _ "a/foo/bar/b"
+-- a/foo/bar/c/main_test.go --
+package c
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("../../../testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+	if _, err := os.Stat("./testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/foo/bar/c/testdata/1 --
+-- a/foo/bar/testdata/1 --
+-- a/go.mod --
+module a
+-- a/main.go --
+package a
+-- a/main_test.go --
+package a
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("./testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/testdata/1 --
+-- appengine.go --
+// +build appengine
+
+package m
+
+import _ "appengine"
+import _ "appengine/datastore"
+-- mypkg/go.mod --
+module me
+-- mypkg/mydir/d.go --
+package mydir
+-- subdir/v1_test.go --
+package m
+
+import _ "mysite/myname/mypkg/mydir"
+-- testdata1.go --
+package m
+
+import _ "a"
+-- testdata2.go --
+package m
+
+import _ "a/foo/bar/c"
+-- v1.go --
+package m
+
+import _ "x"
+-- v2.go --
+// +build abc
+
+package mMmMmMm
+
+import _ "y"
+-- v3.go --
+// +build !abc
+
+package m
+
+import _ "z"
+-- v4.go --
+// +build notmytag
+
+package m
+
+import _ "x/x1"
+-- importdiamond.go --
+package m
+
+import _ "diamondroot"
+-- w/go.mod --
+module w
+-- w/w.go --
+package w
+-- x/go.mod --
+module x
+-- x/testdata/x.txt --
+placeholder - want directory with no go files
+-- x/x.go --
+package x
+-- x/x1/x1.go --
+// +build notmytag
+
+package x1
+-- x/x2/dummy.txt --
+dummy
+-- x/x_test.go --
+package x
+
+import _ "w"
+-- y/go.mod --
+module y
+-- y/y.go --
+package y
+-- z/go.mod --
+module z
+-- z/z.go --
+package z
+
+-- diamondroot/go.mod --
+module diamondroot
+
+require (
+	diamondleft v0.0.0
+	diamondright v0.0.0
+)
+-- diamondroot/x.go --
+package diamondroot
+
+import _ "diamondleft"
+-- diamondroot/unused/unused.go --
+package unused
+
+import _ "diamondright"
+-- diamondleft/go.mod --
+module diamondleft
+
+require (
+	diamondpoint v0.0.0
+)
+-- diamondleft/x.go --
+package diamondleft
+
+import _ "diamondpoint"
+-- diamondright/go.mod --
+module diamondright
+
+require (
+	diamondpoint v0.0.0
+)
+-- diamondright/x.go --
+package diamondright
+
+import _ "diamondpoint"
+-- diamondpoint/go.mod --
+module diamondpoint
+-- diamondpoint/x.go --
+package diamondpoint
diff --git a/src/cmd/go/testdata/script/mod_vendor_auto.txt b/src/cmd/go/testdata/script/mod_vendor_auto.txt
new file mode 100644
index 0000000..b0ea907
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_auto.txt
@@ -0,0 +1,256 @@
+# Integration test for golang.org/issue/33848: automatically check and use vendored packages.
+
+env GO111MODULE=on
+
+[short] skip
+
+cd $WORK/auto
+cp go.mod go.mod.orig
+cp $WORK/modules-1.13.txt $WORK/auto/modules.txt
+
+# An explicit -mod=vendor should force use of the vendor directory.
+env GOFLAGS=-mod=vendor
+
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+! go list -m all
+stderr 'go list -m: can''t compute ''all'' using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+! go list -m -f '{{.Dir}}' all
+stderr 'go list -m: can''t compute ''all'' using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+# An explicit -mod=mod should force the vendor directory to be ignored.
+env GOFLAGS=-mod=mod
+
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+go list -m all
+stdout '^example.com/auto$'
+stdout 'example.com/printversion v1.0.0'
+stdout 'example.com/version v1.0.0'
+
+go list -m -f '{{.Dir}}' all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+# If the main module's "go" directive says 1.13, we should default to -mod=mod.
+env GOFLAGS=
+go mod edit -go=1.13
+
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+go list -m -f '{{.Dir}}' all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+# A 'go 1.14' directive in the main module's go.mod file should enable
+# -mod=vendor by default, along with stronger checks for consistency
+# between the go.mod file and vendor/modules.txt.
+# A 'go 1.13' vendor/modules.txt file is not usually sufficient
+# to pass those checks.
+go mod edit -go=1.14
+
+! go list -f {{.Dir}} -tags tools all
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
+stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt'
+stderr '^\texample.com/unused: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
+stderr '^\texample.com/version@v1.2.0: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
+stderr '^\tTo ignore the vendor directory, use -mod=readonly or -mod=mod.\n\tTo sync the vendor directory, run:\n\t\tgo mod vendor$'
+
+# Module-specific subcommands should continue to load the full module graph.
+go mod graph
+stdout '^example.com/printversion@v1.0.0 example.com/version@v1.0.0$'
+
+# An explicit -mod=mod should still force the vendor directory to be ignored.
+env GOFLAGS=-mod=mod
+
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+go list -m all
+stdout '^example.com/auto$'
+stdout 'example.com/printversion v1.0.0'
+stdout 'example.com/version v1.0.0'
+
+go list -m -f '{{.Dir}}' all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$GOPATH'[/\\]pkg[/\\]mod[/\\]example.com[/\\]printversion@v1.0.0$'
+stdout '^'$WORK'[/\\]auto[/\\]replacement-version$'
+
+# 'go mod vendor' should repair vendor/modules.txt so that the implicit
+# -mod=vendor works again.
+env GOFLAGS=
+
+go mod edit -go=1.14
+go mod vendor
+
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+# ...but 'go list -m' should continue to fail, this time without
+# referring to a -mod default that the user didn't set.
+! go list -m all
+stderr 'go list -m: can''t compute ''all'' using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+! go list -m -f '{{.Dir}}' all
+stderr 'go list -m: can''t compute ''all'' using the vendor directory\n\t\(Use -mod=mod or -mod=readonly to bypass.\)'
+
+
+# 'go mod init' should work if there is already a GOPATH-mode vendor directory
+# present. If there are no module dependencies, -mod=vendor should be used by
+# default and should not fail the consistency check even though no module
+# information is present.
+
+rm go.mod
+rm vendor/modules.txt
+
+go mod init example.com/auto
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+# If information about dependencies is added to a 1.14 go.mod file, subsequent
+# list commands should error out if vendor/modules.txt is missing or incomplete.
+
+cp go.mod.orig go.mod
+go mod edit -go=1.14
+! go list -f {{.Dir}} -tags tools all
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
+stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but not marked as explicit in vendor/modules.txt'
+stderr '^\texample.com/unused: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
+stderr '^\texample.com/version@v1.2.0: is replaced in go.mod, but not marked as replaced in vendor/modules.txt'
+stderr '^\tTo ignore the vendor directory, use -mod=readonly or -mod=mod.\n\tTo sync the vendor directory, run:\n\t\tgo mod vendor$'
+
+# If -mod=vendor is set, limited consistency checks should apply even when
+# the go version is 1.13 or earlier.
+# An incomplete or missing vendor/modules.txt should resolve the vendored packages...
+go mod edit -go=1.13
+go list -mod=vendor -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+# ...but a version mismatch for an explicit dependency should be noticed.
+cp $WORK/modules-bad-1.13.txt vendor/modules.txt
+! go list -mod=vendor -f {{.Dir}} -tags tools all
+stderr '^go: inconsistent vendoring in '$WORK[/\\]auto':$'
+stderr '^\texample.com/printversion@v1.0.0: is explicitly required in go.mod, but vendor/modules.txt indicates example.com/printversion@v1.1.0$'
+stderr '^\tTo ignore the vendor directory, use -mod=readonly or -mod=mod.\n\tTo sync the vendor directory, run:\n\t\tgo mod vendor$'
+
+# If the go version is still 1.13, 'go mod vendor' should write a
+# matching vendor/modules.txt containing the corrected 1.13 data.
+go mod vendor
+cmp $WORK/modules-1.13.txt vendor/modules.txt
+
+go list -mod=vendor -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+# When the version is upgraded to 1.14, 'go mod vendor' should write a
+# vendor/modules.txt with the updated 1.14 annotations.
+go mod edit -go=1.14
+go mod vendor
+cmp $WORK/modules-1.14.txt vendor/modules.txt
+
+# Then, -mod=vendor should kick in automatically and succeed.
+go list -f {{.Dir}} -tags tools all
+stdout '^'$WORK'[/\\]auto$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]printversion$'
+stdout '^'$WORK'[/\\]auto[/\\]vendor[/\\]example.com[/\\]version$'
+
+# 'go get' should update from the network or module cache,
+# even if a vendor directory is present.
+go get -d example.com/version@v1.1.0
+! go list -f {{.Dir}} -tags tools all
+stderr '^go: inconsistent vendoring'
+
+-- $WORK/auto/go.mod --
+module example.com/auto
+
+go 1.13
+
+require example.com/printversion v1.0.0
+
+replace (
+	example.com/unused => nonexistent.example.com/unused v1.0.0-whatever
+	example.com/version v1.0.0 => ./replacement-version
+	example.com/version v1.2.0 => nonexistent.example.com/version v1.2.0
+)
+-- $WORK/auto/tools.go --
+// +build tools
+
+package auto
+
+import _ "example.com/printversion"
+-- $WORK/auto/auto.go --
+package auto
+-- $WORK/auto/replacement-version/go.mod --
+module example.com/version
+-- $WORK/auto/replacement-version/version.go --
+package version
+
+const V = "v1.0.0-replaced"
+-- $WORK/modules-1.14.txt --
+# example.com/printversion v1.0.0
+## explicit
+example.com/printversion
+# example.com/version v1.0.0 => ./replacement-version
+example.com/version
+# example.com/unused => nonexistent.example.com/unused v1.0.0-whatever
+# example.com/version v1.2.0 => nonexistent.example.com/version v1.2.0
+-- $WORK/modules-1.13.txt --
+# example.com/printversion v1.0.0
+example.com/printversion
+# example.com/version v1.0.0 => ./replacement-version
+example.com/version
+-- $WORK/modules-bad-1.13.txt --
+# example.com/printversion v1.1.0
+example.com/printversion
+# example.com/version v1.1.0
+example.com/version
+-- $WORK/auto/vendor/example.com/printversion/go.mod --
+module example.com/printversion
+
+require example.com/version v1.0.0
+replace example.com/version v1.0.0 => ../oops v0.0.0
+exclude example.com/version v1.0.1
+-- $WORK/auto/vendor/example.com/printversion/printversion.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"runtime/debug"
+
+	_ "example.com/version"
+)
+
+func main() {
+	info, _ := debug.ReadBuildInfo()
+	fmt.Fprintf(os.Stdout, "path is %s\n", info.Path)
+	fmt.Fprintf(os.Stdout, "main is %s %s\n", info.Main.Path, info.Main.Version)
+	for _, m := range info.Deps {
+		fmt.Fprintf(os.Stdout, "using %s %s\n", m.Path, m.Version)
+	}
+}
+-- $WORK/auto/vendor/example.com/version/version.go --
+package version
+
+const V = "v1.0.0-replaced"
diff --git a/src/cmd/go/testdata/script/mod_vendor_build.txt b/src/cmd/go/testdata/script/mod_vendor_build.txt
new file mode 100644
index 0000000..3b8eec0
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_build.txt
@@ -0,0 +1,41 @@
+env GO111MODULE=on
+[short] skip
+
+# Populate go.mod and go.sum.
+go mod tidy
+
+# initial conditions: using sampler v1.3.0, not listed in go.mod.
+go list -deps
+stdout rsc.io/sampler
+! grep 'rsc.io/sampler v1.3.0' go.mod
+
+# update to v1.3.1, now indirect in go.mod.
+go get -d rsc.io/sampler@v1.3.1
+grep 'rsc.io/sampler v1.3.1 // indirect' go.mod
+cp go.mod go.mod.good
+
+# vendoring can but should not need to make changes.
+go mod vendor
+cmp go.mod go.mod.good
+
+# go list -mod=vendor (or go build -mod=vendor) must not modify go.mod.
+# golang.org/issue/26704
+go list -mod=vendor
+cmp go.mod go.mod.good
+
+# With a clean (and empty) module cache, 'go list -mod=vendor' should not download modules.
+go clean -modcache
+env GOPROXY=off
+! go list ...
+go list -mod=vendor ...
+
+# However, it should still list packages in the main module.
+go list -mod=vendor m/...
+stdout m
+
+-- go.mod --
+module m
+go 1.12
+-- x.go --
+package x
+import _ "rsc.io/quote"
diff --git a/src/cmd/go/testdata/script/mod_vendor_embed.txt b/src/cmd/go/testdata/script/mod_vendor_embed.txt
new file mode 100644
index 0000000..be11415
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_embed.txt
@@ -0,0 +1,179 @@
+go mod vendor
+cmp vendor/example.com/a/samedir_embed.txt a/samedir_embed.txt
+cmp vendor/example.com/a/subdir/embed.txt a/subdir/embed.txt
+cmp vendor/example.com/a/subdir/test/embed.txt a/subdir/test/embed.txt
+cmp vendor/example.com/a/subdir/test/xtest/embed.txt a/subdir/test/xtest/embed.txt
+
+cd broken_no_matching_files
+! go mod vendor
+stderr 'go mod vendor: pattern foo.txt: no matching files found'
+
+cd ../broken_bad_pattern
+! go mod vendor
+stderr 'go mod vendor: pattern ../foo.txt: invalid pattern syntax'
+
+# matchPotentialSourceFile prunes out tests and unbuilt code.
+# Make sure that they are vendored if they are embedded files.
+cd ../embed_unbuilt
+go mod vendor
+cmp vendor/example.com/dep/unbuilt.go dep/unbuilt.go
+cmp vendor/example.com/dep/dep_test.go dep/dep_test.go
+! exists vendor/example.com/dep/not_embedded_unbuilt.go
+! exists vendor/example.com/dep/not_embedded_dep_test.go
+-- go.mod --
+module example.com/foo
+go 1.16
+
+require (
+	example.com/a v0.1.0
+)
+
+replace (
+	example.com/a v0.1.0 => ./a
+)
+-- foo.go --
+package main
+
+import (
+	"fmt"
+
+	"example.com/a"
+)
+
+func main() {
+    fmt.Println(a.Str())
+}
+-- a/go.mod --
+module example.com/a
+-- a/a.go --
+package a
+
+import _ "embed"
+
+//go:embed samedir_embed.txt
+var sameDir string
+
+//go:embed subdir/embed.txt
+var subDir string
+
+func Str() string {
+	return sameDir + subDir
+}
+-- a/a_test.go --
+package a
+
+import _ "embed"
+
+//go:embed subdir/test/embed.txt
+var subderTest string
+-- a/a_x_test.go --
+package a_test
+
+import _ "embed"
+
+//go:embed subdir/test/xtest/embed.txt
+var subdirXtest string
+-- a/samedir_embed.txt --
+embedded file in same directory as package
+-- a/subdir/embed.txt --
+embedded file in subdirectory of package
+-- a/subdir/test/embed.txt --
+embedded file of test in subdirectory of package
+-- a/subdir/test/xtest/embed.txt --
+embedded file of xtest in subdirectory of package
+-- broken_no_matching_files/go.mod --
+module example.com/broken
+go 1.16
+
+require (
+	example.com/brokendep v0.1.0
+)
+
+replace (
+	example.com/brokendep v0.1.0 => ./brokendep
+)
+-- broken_no_matching_files/f.go --
+package broken
+
+import _ "example.com/brokendep"
+
+func F() {}
+-- broken_no_matching_files/brokendep/go.mod --
+module example.com/brokendep
+go 1.16
+-- broken_no_matching_files/brokendep/f.go --
+package brokendep
+
+import _ "embed"
+
+//go:embed foo.txt
+var foo string
+-- broken_bad_pattern/go.mod --
+module example.com/broken
+go 1.16
+
+require (
+	example.com/brokendep v0.1.0
+)
+
+replace (
+	example.com/brokendep v0.1.0 => ./brokendep
+)
+-- broken_bad_pattern/f.go --
+package broken
+
+import _ "example.com/brokendep"
+
+func F() {}
+-- broken_bad_pattern/brokendep/go.mod --
+module example.com/brokendep
+go 1.16
+-- broken_bad_pattern/brokendep/f.go --
+package brokendep
+
+import _ "embed"
+
+//go:embed ../foo.txt
+var foo string
+-- embed_unbuilt/go.mod --
+module example.com/foo
+go 1.16
+
+require (
+	example.com/dep v0.1.0
+)
+
+replace (
+	example.com/dep v0.1.0 => ./dep
+)
+-- embed_unbuilt/foo.go --
+package a
+
+import _ "example.com/dep"
+
+func F() {}
+-- embed_unbuilt/dep/go.mod --
+module example.com/dep
+go 1.16
+-- embed_unbuilt/dep/dep.go --
+package dep
+
+import _ "embed"
+
+//go:embed unbuilt.go
+var unbuilt string
+
+//go:embed dep_test.go
+var depTest string
+-- embed_unbuilt/dep/unbuilt.go --
+// +build ignore
+
+package dep
+-- embed_unbuilt/dep/not_embedded_unbuilt.go --
+// +build ignore
+
+package dep
+-- embed_unbuilt/dep/dep_test.go --
+package dep
+-- embed_unbuilt/dep/not_embedded_dep_test.go --
+package dep
diff --git a/src/cmd/go/testdata/script/mod_vendor_nodeps.txt b/src/cmd/go/testdata/script/mod_vendor_nodeps.txt
new file mode 100644
index 0000000..e9a84ca
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_nodeps.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=on
+
+go mod vendor
+stderr '^go: no dependencies to vendor'
+
+-- go.mod --
+module x
+-- x.go --
+package x
diff --git a/src/cmd/go/testdata/script/mod_vendor_replace.txt b/src/cmd/go/testdata/script/mod_vendor_replace.txt
new file mode 100644
index 0000000..0c1c1d2
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_replace.txt
@@ -0,0 +1,66 @@
+env GO111MODULE=on
+
+# Before vendoring, we expect to see the original directory.
+go list -f '{{with .Module}}{{.Version}}{{end}} {{.Dir}}' rsc.io/quote/v3
+stdout 'v3.0.0'
+stdout '.*[/\\]not-rsc.io[/\\]quote[/\\]v3'
+
+# Since all dependencies are replaced, 'go mod vendor' should not
+# have to download anything from the network.
+go mod vendor
+! stderr 'downloading'
+! stderr 'finding'
+
+# After vendoring, we expect to see the replacement in the vendor directory,
+# without attempting to look up the non-replaced version.
+cmp vendor/rsc.io/quote/v3/quote.go local/not-rsc.io/quote/v3/quote.go
+
+go list -mod=vendor -f '{{with .Module}}{{.Version}}{{end}} {{.Dir}}' rsc.io/quote/v3
+stdout 'v3.0.0'
+stdout '.*[/\\]vendor[/\\]rsc.io[/\\]quote[/\\]v3'
+! stderr 'finding'
+! stderr 'lookup disabled'
+
+# 'go list' should provide the original replacement directory as the module's
+# replacement path.
+go list -mod=vendor -f '{{with .Module}}{{with .Replace}}{{.Path}}{{end}}{{end}}' rsc.io/quote/v3
+stdout '.*[/\\]not-rsc.io[/\\]quote[/\\]v3'
+
+# The same module can't be used as two different paths.
+cd multiple-paths
+! go mod vendor
+stderr 'rsc.io/quote/v3@v3.0.0 used for two different module paths \(not-rsc.io/quote/v3 and rsc.io/quote/v3\)'
+
+-- go.mod --
+module example.com/replace
+
+require rsc.io/quote/v3 v3.0.0
+replace rsc.io/quote/v3 => ./local/not-rsc.io/quote/v3
+
+-- imports.go --
+package replace
+
+import _ "rsc.io/quote/v3"
+
+-- local/not-rsc.io/quote/v3/go.mod --
+module not-rsc.io/quote/v3
+
+-- local/not-rsc.io/quote/v3/quote.go --
+package quote
+
+-- multiple-paths/main.go --
+package main
+import (
+	"fmt"
+	"rsc.io/quote/v3"
+)
+func main() {
+	fmt.Println(quote.GoV3())
+}
+-- multiple-paths/go.mod --
+module quoter
+require (
+	rsc.io/quote/v3 v3.0.0
+	not-rsc.io/quote/v3 v3.0.0
+)
+replace not-rsc.io/quote/v3 => rsc.io/quote/v3 v3.0.0
diff --git a/src/cmd/go/testdata/script/mod_vendor_trimpath.txt b/src/cmd/go/testdata/script/mod_vendor_trimpath.txt
new file mode 100644
index 0000000..5451aa7
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_trimpath.txt
@@ -0,0 +1,45 @@
+# Check that when -trimpath and -mod=vendor are used together,
+# paths in vendored packages are properly trimmed.
+# Verifies golang.org/issue/36566.
+
+[short] skip
+
+# Only the main module has a root directory in vendor mode.
+go mod vendor
+go list -f {{.Module.Dir}} example.com/main
+stdout $PWD
+go list -f {{.Module.Dir}} example.com/stack
+! stdout .
+
+# The program prints a file name from a vendored package.
+# Without -trimpath, the name should include the vendor directory.
+go run main.go
+stdout vendor
+
+# With -trimpath, everything before the package path should be trimmed.
+# As with -mod=mod, the version should appear as part of the module path.
+go run -mod=vendor -trimpath main.go
+stdout '^example.com/stack@v1.0.0/stack.go$'
+
+# With pristinely vendored source code, a trimmed binary built from vendored
+# code should have the same behavior as one build from the module cache.
+go run -mod=mod -trimpath main.go
+stdout '^example.com/stack@v1.0.0/stack.go$'
+
+-- go.mod --
+module example.com/main
+
+require example.com/stack v1.0.0
+
+-- main.go --
+package main
+
+import (
+  "fmt"
+
+  "example.com/stack"
+)
+
+func main() {
+  fmt.Println(stack.TopFile())
+}
diff --git a/src/cmd/go/testdata/script/mod_vendor_unused.txt b/src/cmd/go/testdata/script/mod_vendor_unused.txt
new file mode 100644
index 0000000..96251bb
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_unused.txt
@@ -0,0 +1,67 @@
+# Auxiliary test for inclusion of otherwise-unused replacements in
+# vendor/modules.txt for golang.org/issue/33848.
+# We need metadata about replacements in order to verify that modules.txt
+# remains in sync with the main module's go.mod file.
+
+env GO111MODULE=on
+
+go mod vendor
+cmp go1.14-modules.txt vendor/modules.txt
+
+-- go.mod --
+module example.com/foo
+go 1.14
+
+require (
+	example.com/a v0.1.0
+)
+
+replace (
+	example.com/a v0.1.0 => ./a
+	example.com/b v0.1.0 => ./b1
+	example.com/b v0.2.0-unused => ./b2
+	example.com/c => ./c
+	example.com/d v0.1.0 => ./d1
+	example.com/d v0.2.0 => ./d2
+	example.com/e => example.com/e v0.1.0-unused
+)
+-- foo.go --
+package foo
+import _ "example.com/a"
+-- a/go.mod --
+module example.com/a
+require (
+	example.com/b v0.1.0 // indirect
+	example.com/c v0.1.0 // indirect
+)
+-- a/a.go --
+package a
+import _ "example.com/d"
+-- b1/go.mod --
+module example.com/b
+require example.com/d v0.1.0
+-- b2/go.mod --
+module example.com/b
+require example.com/c v0.2.0
+-- c/go.mod --
+module example.com/c
+require example.com/d v0.2.0
+-- d1/go.mod --
+module example.com/d
+-- d1/d1.go --
+package d
+-- d2/go.mod --
+module example.com/d
+-- d2/d2.go --
+package d
+-- go1.14-modules.txt --
+# example.com/a v0.1.0 => ./a
+## explicit
+example.com/a
+# example.com/d v0.2.0 => ./d2
+example.com/d
+# example.com/b v0.1.0 => ./b1
+# example.com/b v0.2.0-unused => ./b2
+# example.com/c => ./c
+# example.com/d v0.1.0 => ./d1
+# example.com/e => example.com/e v0.1.0-unused
diff --git a/src/cmd/go/testdata/script/mod_vendor_unused_only.txt b/src/cmd/go/testdata/script/mod_vendor_unused_only.txt
new file mode 100644
index 0000000..839c645
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_vendor_unused_only.txt
@@ -0,0 +1,17 @@
+# Ensure that we generate a vendor/modules.txt file even when the only
+# requirements in go.mod are unused.  Regression test for
+# golang.org/issue/36580
+
+env GO111MODULE=on
+
+go mod vendor
+cmp go1.14-modules.txt vendor/modules.txt
+
+-- go.mod --
+module example.com/m
+go 1.14
+
+require example.com v1.0.0 // indirect
+-- go1.14-modules.txt --
+# example.com v1.0.0
+## explicit
diff --git a/src/cmd/go/testdata/script/mod_verify.txt b/src/cmd/go/testdata/script/mod_verify.txt
new file mode 100644
index 0000000..b510665
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_verify.txt
@@ -0,0 +1,87 @@
+env GO111MODULE=on
+[short] skip
+
+# With good go.sum, verify succeeds by avoiding download.
+cp go.sum.good go.sum
+go mod verify
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip
+
+# With bad go.sum, verify succeeds by avoiding download.
+cp go.sum.bad go.sum
+go mod verify
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip
+
+# With bad go.sum, sync (which must download) fails.
+rm go.sum
+cp go.sum.bad go.sum
+! go mod tidy
+stderr 'checksum mismatch'
+! exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip
+
+# With good go.sum, sync works.
+rm go.sum
+cp go.sum.good go.sum
+go mod tidy
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.zip
+exists $GOPATH/pkg/mod/rsc.io/quote@v1.1.0/quote.go
+
+# go.sum should have the new checksum for go.mod
+grep '^rsc.io/quote v1.1.0/go.mod ' go.sum
+
+# verify should work
+go mod verify
+
+# basic loading of module graph should detect incorrect go.mod files.
+go mod graph
+cp go.sum.bad2 go.sum
+! go mod graph
+stderr 'go.mod: checksum mismatch'
+
+# go.sum should be created and updated automatically.
+rm go.sum
+go mod graph
+exists go.sum
+grep '^rsc.io/quote v1.1.0/go.mod ' go.sum
+! grep '^rsc.io/quote v1.1.0 ' go.sum
+
+go mod tidy
+grep '^rsc.io/quote v1.1.0/go.mod ' go.sum
+grep '^rsc.io/quote v1.1.0 ' go.sum
+
+# verify should fail on a missing ziphash. tidy should restore it.
+rm $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.ziphash
+! go mod verify
+stderr '^rsc.io/quote v1.1.0: missing ziphash: open '$GOPATH'[/\\]pkg[/\\]mod[/\\]cache[/\\]download[/\\]rsc.io[/\\]quote[/\\]@v[/\\]v1.1.0.ziphash'
+go mod tidy
+exists $GOPATH/pkg/mod/cache/download/rsc.io/quote/@v/v1.1.0.ziphash
+go mod verify
+
+# Packages below module root should not be mentioned in go.sum.
+rm go.sum
+go mod edit -droprequire rsc.io/quote
+go get -d rsc.io/quote/buggy
+grep '^rsc.io/quote v1.5.2/go.mod ' go.sum
+! grep buggy go.sum
+
+# non-existent packages below module root should not be mentioned in go.sum
+go mod edit -droprequire rsc.io/quote
+! go list rsc.io/quote/morebuggy
+grep '^rsc.io/quote v1.5.2/go.mod ' go.sum
+! grep buggy go.sum
+
+-- go.mod --
+module x
+require rsc.io/quote v1.1.0
+
+-- x.go --
+package x
+import _ "rsc.io/quote"
+
+-- go.sum.good --
+rsc.io/quote v1.1.0 h1:a3YaZoizPtXyv6ZsJ74oo2L4/bwOSTKMY7MAyo4O/0c=
+
+-- go.sum.bad --
+rsc.io/quote v1.1.0 h1:a3YaZoizPtXyv6ZsJ74oo2L4/bwOSTKMY7MAyo4O/1c=
+
+-- go.sum.bad2 --
+rsc.io/quote v1.1.0/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl1=
diff --git a/src/cmd/go/testdata/script/mod_versions.txt b/src/cmd/go/testdata/script/mod_versions.txt
new file mode 100644
index 0000000..9e6322b
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_versions.txt
@@ -0,0 +1,14 @@
+# Test rejection of pkg@version in GOPATH mode.
+env GO111MODULE=off
+! go get rsc.io/quote@v1.5.1
+stderr '^go: can only use path@version syntax with ''go get'' and ''go install'' in module-aware mode$'
+! go build rsc.io/quote@v1.5.1
+stderr '^package rsc.io/quote@v1.5.1: can only use path@version syntax with ''go get'' and ''go install'' in module-aware mode$'
+
+env GO111MODULE=on
+cd x
+! go build rsc.io/quote@v1.5.1
+stderr '^package rsc.io/quote@v1.5.1: can only use path@version syntax with ''go get'' and ''go install'' in module-aware mode$'
+
+-- x/go.mod --
+module x
diff --git a/src/cmd/go/testdata/script/mod_why.txt b/src/cmd/go/testdata/script/mod_why.txt
new file mode 100644
index 0000000..b3036fa
--- /dev/null
+++ b/src/cmd/go/testdata/script/mod_why.txt
@@ -0,0 +1,130 @@
+env GO111MODULE=on
+[short] skip
+
+# Populate go.sum.
+go mod tidy
+cp go.mod go.mod.orig
+
+go list -test all
+stdout rsc.io/quote
+stdout golang.org/x/text/language
+
+# why a package?
+go mod why golang.org/x/text/language
+cmp stdout why-language.txt
+
+# why a module?
+go mod why -m golang.org...
+cmp stdout why-text-module.txt
+
+# why a package used only in tests?
+go mod why rsc.io/testonly
+cmp stdout why-testonly.txt
+
+# why a module used only in a test of a dependency?
+go mod why -m rsc.io/testonly
+cmp stdout why-testonly.txt
+
+# test package not needed
+go mod why golang.org/x/text/unused
+cmp stdout why-unused.txt
+
+# vendor doesn't use packages used only in tests.
+go mod why -vendor rsc.io/testonly
+cmp stdout why-vendor.txt
+
+# vendor doesn't use modules used only in tests.
+go mod why -vendor -m rsc.io/testonly
+cmp stdout why-vendor-module.txt
+
+# test multiple packages
+go mod why golang.org/x/text/language golang.org/x/text/unused
+cmp stdout why-both.txt
+
+# test multiple modules
+go mod why -m rsc.io/quote rsc.io/sampler
+cmp stdout why-both-module.txt
+
+# package in a module that isn't even in the module graph
+# (https://golang.org/issue/26977)
+go mod why rsc.io/fortune
+cmp stdout why-missing.txt
+
+# None of these command should have changed the go.mod file.
+cmp go.mod go.mod.orig
+
+-- go.mod --
+module mymodule
+require rsc.io/quote v1.5.2
+
+-- x/x.go --
+package x
+import _ "mymodule/z"
+
+-- y/y.go --
+package y
+
+-- y/y_test.go --
+package y
+import _ "rsc.io/quote"
+
+-- z/z.go --
+package z
+import _ "mymodule/y"
+
+
+-- why-language.txt --
+# golang.org/x/text/language
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+rsc.io/sampler
+golang.org/x/text/language
+-- why-unused.txt --
+# golang.org/x/text/unused
+(main module does not need package golang.org/x/text/unused)
+-- why-text-module.txt --
+# golang.org/x/text
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+rsc.io/sampler
+golang.org/x/text/language
+-- why-testonly.txt --
+# rsc.io/testonly
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+rsc.io/sampler
+rsc.io/sampler.test
+rsc.io/testonly
+-- why-vendor.txt --
+# rsc.io/testonly
+(main module does not need to vendor package rsc.io/testonly)
+-- why-vendor-module.txt --
+# rsc.io/testonly
+(main module does not need to vendor module rsc.io/testonly)
+-- why-both.txt --
+# golang.org/x/text/language
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+rsc.io/sampler
+golang.org/x/text/language
+
+# golang.org/x/text/unused
+(main module does not need package golang.org/x/text/unused)
+-- why-both-module.txt --
+# rsc.io/quote
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+
+# rsc.io/sampler
+mymodule/y
+mymodule/y.test
+rsc.io/quote
+rsc.io/sampler
+-- why-missing.txt --
+# rsc.io/fortune
+(main module does not need package rsc.io/fortune)
diff --git a/src/cmd/go/testdata/script/modfile_flag.txt b/src/cmd/go/testdata/script/modfile_flag.txt
new file mode 100644
index 0000000..0ad0880
--- /dev/null
+++ b/src/cmd/go/testdata/script/modfile_flag.txt
@@ -0,0 +1,93 @@
+# Tests the behavior of the -modfile flag in commands that support it.
+# The go.mod file exists but should not be read or written.
+# Same with go.sum.
+
+env GOFLAGS=-modfile=go.alt.mod
+cp go.mod go.mod.orig
+cp go.sum go.sum.orig
+
+
+# go mod init should create a new file, even though go.mod already exists.
+go mod init example.com/m
+grep example.com/m go.alt.mod
+
+# 'go env GOMOD' should print the path to the real file.
+# 'go env' does not recognize the '-modfile' flag.
+go env GOMOD
+stdout '^\$WORK[/\\]gopath[/\\]src[/\\]go.mod$'
+
+# 'go list -m' should print the effective go.mod file as GoMod though.
+go list -m -f '{{.GoMod}}'
+stdout '^go.alt.mod$'
+
+# go mod edit should operate on the alternate file
+go mod edit -require rsc.io/quote@v1.5.2
+grep rsc.io/quote go.alt.mod
+
+# other 'go mod' commands should work. 'go mod vendor' is tested later.
+go mod download rsc.io/quote
+go mod graph
+stdout rsc.io/quote
+go mod tidy
+grep rsc.io/quote go.alt.sum
+go mod verify
+go mod why rsc.io/quote
+
+
+# 'go list' and other commands with build flags should work.
+# They should update the alternate go.mod when a dependency is missing.
+go mod edit -droprequire rsc.io/quote
+go list -mod=mod .
+grep rsc.io/quote go.alt.mod
+go build -n -mod=mod .
+go test -n -mod=mod .
+go get -d rsc.io/quote
+
+
+# 'go mod vendor' should work.
+go mod vendor
+exists vendor
+
+# Automatic vendoring should be broken by editing an explicit requirement
+# in the alternate go.mod file.
+go mod edit -require rsc.io/quote@v1.5.1
+! go list .
+go list -mod=mod
+rm vendor
+
+
+# 'go generate' should use the alternate file when resolving packages.
+# Recursive go commands started with 'go generate' should not get an explicitly
+# passed -modfile, but they should see arguments from GOFLAGS.
+cp go.alt.mod go.gen.mod
+env OLD_GOFLAGS=$GOFLAGS
+env GOFLAGS=-modfile=go.gen.mod
+go generate -modfile=go.alt.mod .
+env GOFLAGS=$OLD_GOFLAGS
+grep example.com/exclude go.gen.mod
+! grep example.com/exclude go.alt.mod
+
+
+# The original files should not have been modified.
+cmp go.mod go.mod.orig
+cmp go.sum go.sum.orig
+
+
+# If the altnernate mod file does not have a ".mod" suffix, an error
+# should be reported.
+cp go.alt.mod goaltmod
+! go mod tidy -modfile=goaltmod
+stderr '-modfile=goaltmod: file does not have .mod extension'
+
+-- go.mod --
+ʕ◔ϖ◔ʔ
+-- go.sum --
+ʕ◔ϖ◔ʔ
+-- use.go --
+package main
+
+import _ "rsc.io/quote"
+-- gen.go --
+//go:generate go mod edit -exclude example.com/exclude@v1.0.0
+
+package main
diff --git a/src/cmd/go/testdata/script/noncanonical_import.txt b/src/cmd/go/testdata/script/noncanonical_import.txt
new file mode 100644
index 0000000..018cb01
--- /dev/null
+++ b/src/cmd/go/testdata/script/noncanonical_import.txt
@@ -0,0 +1,19 @@
+env GO111MODULE=off
+
+! go build canonical/d
+stderr '^canonical[/\\]b[/\\]b.go:3:8: non-canonical import path "canonical/a/": should be "canonical/a"$'
+
+-- canonical/a/a.go --
+package a
+
+import _ "c"
+-- canonical/b/b.go --
+package b
+
+import _ "canonical/a/"
+-- canonical/a/vendor/c/c.go --
+package c
+-- canonical/d/d.go --
+package d
+
+import _ "canonical/b"
diff --git a/src/cmd/go/testdata/script/pattern_syntax_error.txt b/src/cmd/go/testdata/script/pattern_syntax_error.txt
new file mode 100644
index 0000000..9a1f5e5
--- /dev/null
+++ b/src/cmd/go/testdata/script/pattern_syntax_error.txt
@@ -0,0 +1,12 @@
+env GO111MODULE=off
+
+# patterns match directories with syntax errors
+! go list ./...
+! go build ./...
+! go install ./...
+
+-- mypkg/x.go --
+package mypkg
+
+-- mypkg/y.go --
+pkg mypackage
diff --git a/src/cmd/go/testdata/script/prevent_sys_unix_import.txt b/src/cmd/go/testdata/script/prevent_sys_unix_import.txt
new file mode 100644
index 0000000..ea1ad78
--- /dev/null
+++ b/src/cmd/go/testdata/script/prevent_sys_unix_import.txt
@@ -0,0 +1,6 @@
+# Policy decision: we shouldn't vendor golang.org/x/sys/unix in std
+# See https://golang.org/issue/32102
+
+env GO111MODULE=on
+go list std
+! stdout vendor/golang.org/x/sys/unix
diff --git a/src/cmd/go/testdata/script/run_dirs.txt b/src/cmd/go/testdata/script/run_dirs.txt
new file mode 100644
index 0000000..538a6ac
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_dirs.txt
@@ -0,0 +1,11 @@
+cd rundir
+
+! go run x.go sub/sub.go
+stderr 'named files must all be in one directory; have ./ and sub/'
+! go run sub/sub.go x.go
+stderr 'named files must all be in one directory; have sub/ and ./'
+
+-- rundir/sub/sub.go --
+package main
+-- rundir/x.go --
+package main
diff --git a/src/cmd/go/testdata/script/run_hello.txt b/src/cmd/go/testdata/script/run_hello.txt
new file mode 100644
index 0000000..939b661
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_hello.txt
@@ -0,0 +1,9 @@
+env GO111MODULE=off
+
+# hello world
+go run hello.go
+stderr 'hello world'
+
+-- hello.go --
+package main
+func main() { println("hello world") }
diff --git a/src/cmd/go/testdata/script/run_hello_pkg.txt b/src/cmd/go/testdata/script/run_hello_pkg.txt
new file mode 100644
index 0000000..ea2b4d7
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_hello_pkg.txt
@@ -0,0 +1,17 @@
+go run m/hello
+stderr 'hello, world'
+
+cd hello
+go run .
+stderr 'hello, world'
+
+-- go.mod --
+module m
+
+go 1.16
+-- hello/hello.go --
+package main
+
+func main() {
+	println("hello, world")
+}
diff --git a/src/cmd/go/testdata/script/run_internal.txt b/src/cmd/go/testdata/script/run_internal.txt
new file mode 100644
index 0000000..d021850
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_internal.txt
@@ -0,0 +1,64 @@
+env GO111MODULE=off
+
+go list -e -f '{{.Incomplete}}' m/runbad1.go
+stdout true
+! go run m/runbad1.go
+stderr 'use of internal package m/x/internal not allowed'
+
+go list -e -f '{{.Incomplete}}' m/runbad2.go
+stdout true
+! go run m/runbad2.go
+stderr 'use of internal package m/x/internal/y not allowed'
+
+go list -e -f '{{.Incomplete}}' m/runok.go
+stdout false
+go run m/runok.go
+
+cd m
+env GO111MODULE=on
+
+go list -e -f '{{.Incomplete}}' runbad1.go
+stdout true
+! go run runbad1.go
+stderr 'use of internal package m/x/internal not allowed'
+
+go list -e -f '{{.Incomplete}}' runbad2.go
+stdout true
+! go run runbad2.go
+stderr 'use of internal package m/x/internal/y not allowed'
+
+go list -e -f '{{.Incomplete}}' runok.go
+stdout false
+go run runok.go
+
+
+-- m/go.mod --
+module m
+
+-- m/x/internal/internal.go --
+package internal
+
+-- m/x/internal/y/y.go --
+package y
+
+-- m/internal/internal.go --
+package internal
+
+-- m/internal/z/z.go --
+package z
+
+-- m/runbad1.go --
+package main
+import _ "m/x/internal"
+func main() {}
+
+-- m/runbad2.go --
+package main
+import _ "m/x/internal/y"
+func main() {}
+
+-- m/runok.go --
+package main
+import _ "m/internal"
+import _ "m/internal/z"
+func main() {}
diff --git a/src/cmd/go/testdata/script/run_issue11709.txt b/src/cmd/go/testdata/script/run_issue11709.txt
new file mode 100644
index 0000000..c8ba998
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_issue11709.txt
@@ -0,0 +1,15 @@
+# 'go run' should not pass extraneous environment variables to the subprocess.
+go run run.go
+! stdout .
+! stderr .
+
+-- run.go --
+package main
+
+import "os"
+
+func main() {
+	if os.Getenv("TERM") != "" {
+		os.Exit(1)
+	}
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/run_set_executable_name.txt b/src/cmd/go/testdata/script/run_set_executable_name.txt
new file mode 100644
index 0000000..54ddee9
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_set_executable_name.txt
@@ -0,0 +1,50 @@
+env GO111MODULE=on
+[short] skip
+
+# Check for correct naming of temporary executable
+
+#Test for single file specified
+cd x/y/z
+go run foo.go
+stderr 'foo'
+
+#Test for current directory
+go run .
+stderr 'z'
+
+#Test for set path
+go run m/x/y/z/
+stderr 'z'
+
+-- m/x/y/z/foo.go --
+package main
+import(
+	"os"
+	"path/filepath"
+)
+func main() {
+	println(filepath.Base(os.Args[0]))
+}
+
+-- x/y/z/foo.go --
+package main
+import(
+	"os"
+	"path/filepath"
+)
+func main() {
+	println(filepath.Base(os.Args[0]))
+}
+
+-- x/y/z/foo.go --
+package main
+import(
+	"os"
+	"path/filepath"
+)
+func main() {
+	println(filepath.Base(os.Args[0]))
+}
+
+-- go.mod --
+module m
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/run_vendor.txt b/src/cmd/go/testdata/script/run_vendor.txt
new file mode 100644
index 0000000..46cac06
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_vendor.txt
@@ -0,0 +1,34 @@
+# Run
+env GO111MODULE=off
+cd vend/hello
+go run hello.go
+stdout 'hello, world'
+
+-- vend/hello/hello.go --
+package main
+
+import (
+	"fmt"
+	"strings" // really ../vendor/strings
+)
+
+func main() {
+	fmt.Printf("%s\n", strings.Msg)
+}
+-- vend/hello/hello_test.go --
+package main
+
+import (
+	"strings" // really ../vendor/strings
+	"testing"
+)
+
+func TestMsgInternal(t *testing.T) {
+	if strings.Msg != "hello, world" {
+		t.Fatalf("unexpected msg: %v", strings.Msg)
+	}
+}
+-- vend/vendor/strings/msg.go --
+package strings
+
+var Msg = "hello, world"
diff --git a/src/cmd/go/testdata/script/run_wildcard.txt b/src/cmd/go/testdata/script/run_wildcard.txt
new file mode 100644
index 0000000..72036d1
--- /dev/null
+++ b/src/cmd/go/testdata/script/run_wildcard.txt
@@ -0,0 +1,7 @@
+env GO111MODULE=off
+
+# Fix for https://github.com/golang/go/issues/28696:
+# go run x/... should not panic when directory x doesn't exist.
+
+! go run nonexistent/...
+stderr '^go run: no packages loaded from nonexistent/...$'
diff --git a/src/cmd/go/testdata/script/script_wait.txt b/src/cmd/go/testdata/script/script_wait.txt
new file mode 100644
index 0000000..acaccfe
--- /dev/null
+++ b/src/cmd/go/testdata/script/script_wait.txt
@@ -0,0 +1,25 @@
+env GO111MODULE=off
+
+[!exec:echo] skip
+[!exec:false] skip
+
+exec echo foo
+stdout foo
+
+exec echo foo &
+exec echo bar &
+! exec false &
+
+# Starting a background process should clear previous output.
+! stdout foo
+
+# Wait should set the output to the concatenated outputs of the background
+# programs, in the order in which they were started.
+wait
+stdout 'foo\nbar'
+
+# The end of the test should interrupt or kill any remaining background
+# programs, but that should not cause the test to fail if it does not
+# care about the exit status of those programs.
+[!exec:sleep] stop
+? exec sleep 86400 &
diff --git a/src/cmd/go/testdata/script/std_vendor.txt b/src/cmd/go/testdata/script/std_vendor.txt
new file mode 100644
index 0000000..6cb015f
--- /dev/null
+++ b/src/cmd/go/testdata/script/std_vendor.txt
@@ -0,0 +1,43 @@
+env GO111MODULE=off
+
+[!gc] skip
+
+# 'go list' should report imports from _test.go in the TestImports field.
+go list -f '{{.TestImports}}'
+stdout net/http # from .TestImports
+
+# 'go list' should report standard-vendored packages by path.
+go list -f '{{.Dir}}' vendor/golang.org/x/net/http2/hpack
+stdout $GOROOT[/\\]src[/\\]vendor
+
+# 'go list -test' should report vendored transitive dependencies of _test.go
+# imports in the Deps field, with a 'vendor' prefix on their import paths.
+go list -test -f '{{.Deps}}'
+stdout golang.org/x/crypto # dep of .TestImports
+
+# Packages outside the standard library should not use its copy of vendored packages.
+cd broken
+! go build
+stderr 'cannot find package'
+
+-- go.mod --
+module m
+
+-- x.go --
+package x
+
+-- x_test.go --
+package x
+import "testing"
+import _ "net/http"
+func Test(t *testing.T) {}
+
+-- broken/go.mod --
+module broken
+-- broken/http.go --
+package broken
+
+import (
+	_ "net/http"
+	_ "golang.org/x/net/http/httpproxy"
+)
diff --git a/src/cmd/go/testdata/script/test_bad_example.txt b/src/cmd/go/testdata/script/test_bad_example.txt
new file mode 100644
index 0000000..1d147b6
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_bad_example.txt
@@ -0,0 +1,13 @@
+# Tests that invalid examples are ignored.
+# Verifies golang.org/issue/35284
+go test x_test.go
+
+-- x_test.go --
+package  x
+
+import "fmt"
+
+func ExampleThisShouldNotHaveAParameter(thisShouldntExist int) {
+	fmt.Println("X")
+	// Output:
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_badtest.txt b/src/cmd/go/testdata/script/test_badtest.txt
new file mode 100644
index 0000000..e79fc51
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_badtest.txt
@@ -0,0 +1,49 @@
+env GO111MODULE=off
+
+! go test badtest/badexec
+! stdout ^ok
+stdout ^FAIL\tbadtest/badexec
+
+! go test badtest/badsyntax
+! stdout ^ok
+stdout ^FAIL\tbadtest/badsyntax
+
+! go test badtest/badvar
+! stdout ^ok
+stdout ^FAIL\tbadtest/badvar
+
+! go test notest
+! stdout ^ok
+stderr '^notest.hello.go:6:1: syntax error: non-declaration statement outside function body' # Exercise issue #7108
+
+-- badtest/badexec/x_test.go --
+package badexec
+
+func init() {
+	panic("badexec")
+}
+
+-- badtest/badsyntax/x.go --
+package badsyntax
+
+-- badtest/badsyntax/x_test.go --
+package badsyntax
+
+func func func func func!
+
+-- badtest/badvar/x.go --
+package badvar
+
+-- badtest/badvar/x_test.go --
+package badvar_test
+
+func f() {
+	_ = notdefined
+}
+-- notest/hello.go --
+package notest
+
+func hello() {
+	println("hello world")
+}
+Hello world
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_benchmark_chatty_fail.txt b/src/cmd/go/testdata/script/test_benchmark_chatty_fail.txt
new file mode 100644
index 0000000..6031ead
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_benchmark_chatty_fail.txt
@@ -0,0 +1,32 @@
+# Run chatty tests. Assert on CONT lines.
+! go test chatty_test.go -v -bench . chatty_bench
+
+# Sanity check that output occurs.
+stdout -count=2 'this is sub-0'
+stdout -count=2 'this is sub-1'
+stdout -count=2 'this is sub-2'
+stdout -count=1 'error from sub-0'
+stdout -count=1 'error from sub-1'
+stdout -count=1 'error from sub-2'
+
+# Benchmarks should not print CONT.
+! stdout CONT
+
+-- chatty_test.go --
+package chatty_bench
+
+import (
+	"testing"
+	"fmt"
+)
+
+func BenchmarkChatty(b *testing.B) {
+    for i := 0; i < 3; i++ {
+        b.Run(fmt.Sprintf("sub-%d", i), func(b *testing.B) {
+            for j := 0; j < 2; j++ {
+                b.Logf("this is sub-%d", i)
+            }
+            b.Errorf("error from sub-%d", i)
+        })
+    }
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_benchmark_chatty_success.txt b/src/cmd/go/testdata/script/test_benchmark_chatty_success.txt
new file mode 100644
index 0000000..a1c0d65
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_benchmark_chatty_success.txt
@@ -0,0 +1,29 @@
+# Run chatty tests. Assert on CONT lines.
+go test chatty_test.go -v -bench . chatty_bench
+
+# Sanity check that output happens. We don't provide -count because the amount
+# of output is variable.
+stdout 'this is sub-0'
+stdout 'this is sub-1'
+stdout 'this is sub-2'
+
+# Benchmarks should not print CONT.
+! stdout CONT
+
+-- chatty_test.go --
+package chatty_bench
+
+import (
+	"testing"
+	"fmt"
+)
+
+func BenchmarkChatty(b *testing.B) {
+    for i := 0; i < 3; i++ {
+        b.Run(fmt.Sprintf("sub-%d", i), func(b *testing.B) {
+            for j := 0; j < 2; j++ {
+                b.Logf("this is sub-%d", i)
+            }
+        })
+    }
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_benchmark_fatal.txt b/src/cmd/go/testdata/script/test_benchmark_fatal.txt
new file mode 100644
index 0000000..e281379
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_benchmark_fatal.txt
@@ -0,0 +1,19 @@
+# Test that calling t.Fatal in a benchmark causes a non-zero exit status.
+
+! go test -run '^$' -bench . benchfatal
+! stdout ^ok
+! stderr ^ok
+stdout FAIL.*benchfatal
+
+-- go.mod --
+module benchfatal
+
+go 1.16
+-- x_test.go --
+package benchfatal
+
+import "testing"
+
+func BenchmarkThatCallsFatal(b *testing.B) {
+	b.Fatal("called by benchmark")
+}
diff --git a/src/cmd/go/testdata/script/test_benchmark_labels.txt b/src/cmd/go/testdata/script/test_benchmark_labels.txt
new file mode 100644
index 0000000..6b424c1
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_benchmark_labels.txt
@@ -0,0 +1,23 @@
+# Tests that go test -bench prints out goos, goarch, and pkg.
+
+# Check for goos, goarch, and pkg.
+go test -run ^$ -bench . bench
+stdout '^goos: '$GOOS
+stdout '^goarch: '$GOARCH
+stdout '^pkg: bench'
+
+# Check go test does not print pkg multiple times
+! stdout 'pkg:.*pkg: '
+! stderr 'pkg:.*pkg:'
+
+-- go.mod --
+module bench
+
+go 1.16
+-- x_test.go --
+package bench
+
+import "testing"
+
+func Benchmark(b *testing.B) {
+}
diff --git a/src/cmd/go/testdata/script/test_benchmark_timeout.txt b/src/cmd/go/testdata/script/test_benchmark_timeout.txt
new file mode 100644
index 0000000..4bae7e7
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_benchmark_timeout.txt
@@ -0,0 +1,18 @@
+# Tests issue #18845
+[short] skip
+
+go test -bench . -timeout=750ms timeoutbench_test.go
+stdout ok
+stdout PASS
+
+-- timeoutbench_test.go --
+package timeoutbench_test
+
+import (
+	"testing"
+	"time"
+)
+
+func BenchmarkSleep1s(b *testing.B) {
+	time.Sleep(1 * time.Second)
+}
diff --git a/src/cmd/go/testdata/script/test_build_failure.txt b/src/cmd/go/testdata/script/test_build_failure.txt
new file mode 100644
index 0000000..8d13634
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_build_failure.txt
@@ -0,0 +1,31 @@
+[short] skip
+
+! go test -x coverbad
+! stderr '[\\/]coverbad\.test( |$)' # 'go test' should not claim to have run the test.
+stderr 'undefined: g'
+stderr 'undefined: j'
+
+-- go.mod --
+module coverbad
+
+go 1.16
+-- p.go --
+package p
+
+func f() {
+	g()
+}
+-- p1.go --
+package p
+
+import "C"
+
+func h() {
+	j()
+}
+-- p_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/test_cache_inputs.txt b/src/cmd/go/testdata/script/test_cache_inputs.txt
new file mode 100644
index 0000000..50486e1
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_cache_inputs.txt
@@ -0,0 +1,251 @@
+env GO111MODULE=off
+
+# Test that cached test results are invalidated in response to
+# changes to the external inputs to the test.
+
+[short] skip
+[GODEBUG:gocacheverify=1] skip
+
+# We're testing cache behavior, so start with a clean GOCACHE.
+env GOCACHE=$WORK/cache
+
+# Build a helper binary to invoke os.Chtimes.
+go build -o mkold$GOEXE mkold.go
+
+# Make test input files appear to be a minute old.
+exec ./mkold$GOEXE 1m testcache/file.txt
+exec ./mkold$GOEXE 1m testcache/script.sh
+
+# If the test reads an environment variable, changes to that variable
+# should invalidate cached test results.
+env TESTKEY=x
+go test testcache -run=TestLookupEnv
+go test testcache -run=TestLookupEnv
+stdout '\(cached\)'
+
+env TESTKEY=y
+go test testcache -run=TestLookupEnv
+! stdout '\(cached\)'
+go test testcache -run=TestLookupEnv
+stdout '\(cached\)'
+
+# Changes in arguments forwarded to the test should invalidate cached test
+# results.
+go test testcache -run=TestOSArgs -v hello
+! stdout '\(cached\)'
+stdout 'hello'
+go test testcache -run=TestOSArgs -v goodbye
+! stdout '\(cached\)'
+stdout 'goodbye'
+
+# golang.org/issue/36134: that includes the `-timeout` argument.
+go test testcache -run=TestOSArgs -timeout=20m -v
+! stdout '\(cached\)'
+stdout '-test\.timeout[= ]20m'
+go test testcache -run=TestOSArgs -timeout=5s -v
+! stdout '\(cached\)'
+stdout '-test\.timeout[= ]5s'
+
+# If the test stats a file, changes to the file should invalidate the cache.
+go test testcache -run=FileSize
+go test testcache -run=FileSize
+stdout '\(cached\)'
+
+cp 4x.txt testcache/file.txt
+go test testcache -run=FileSize
+! stdout '\(cached\)'
+go test testcache -run=FileSize
+stdout '\(cached\)'
+
+# Files should be tracked even if the test changes its working directory.
+go test testcache -run=Chdir
+go test testcache -run=Chdir
+stdout '\(cached\)'
+cp 6x.txt testcache/file.txt
+go test testcache -run=Chdir
+! stdout '\(cached\)'
+go test testcache -run=Chdir
+stdout '\(cached\)'
+
+# The content of files should affect caching, provided that the mtime also changes.
+exec ./mkold$GOEXE 1m testcache/file.txt
+go test testcache -run=FileContent
+go test testcache -run=FileContent
+stdout '\(cached\)'
+cp 2y.txt testcache/file.txt
+exec ./mkold$GOEXE 50s testcache/file.txt
+go test testcache -run=FileContent
+! stdout '\(cached\)'
+go test testcache -run=FileContent
+stdout '\(cached\)'
+
+# Directory contents read via os.ReadDirNames should affect caching.
+go test testcache -run=DirList
+go test testcache -run=DirList
+stdout '\(cached\)'
+rm testcache/file.txt
+go test testcache -run=DirList
+! stdout '\(cached\)'
+go test testcache -run=DirList
+stdout '\(cached\)'
+
+# Files outside GOROOT and GOPATH should not affect caching.
+env TEST_EXTERNAL_FILE=$WORK/external.txt
+go test testcache -run=ExternalFile
+go test testcache -run=ExternalFile
+stdout '\(cached\)'
+
+rm $WORK/external.txt
+go test testcache -run=ExternalFile
+stdout '\(cached\)'
+
+# Executables within GOROOT and GOPATH should affect caching,
+# even if the test does not stat them explicitly.
+
+[!exec:/bin/sh] skip
+chmod 0755 ./testcache/script.sh
+
+exec ./mkold$GOEXEC 1m testcache/script.sh
+go test testcache -run=Exec
+go test testcache -run=Exec
+stdout '\(cached\)'
+
+exec ./mkold$GOEXE 50s testcache/script.sh
+go test testcache -run=Exec
+! stdout '\(cached\)'
+go test testcache -run=Exec
+stdout '\(cached\)'
+
+-- testcache/file.txt --
+xx
+-- 4x.txt --
+xxxx
+-- 6x.txt --
+xxxxxx
+-- 2y.txt --
+yy
+-- $WORK/external.txt --
+This file is outside of GOPATH.
+-- testcache/script.sh --
+#!/bin/sh
+exit 0
+-- testcache/testcache_test.go --
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package testcache
+
+import (
+	"io"
+	"os"
+	"testing"
+)
+
+func TestChdir(t *testing.T) {
+	os.Chdir("..")
+	defer os.Chdir("testcache")
+	info, err := os.Stat("testcache/file.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info.Size()%2 != 1 {
+		t.Fatal("even file")
+	}
+}
+
+func TestOddFileContent(t *testing.T) {
+	f, err := os.Open("file.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	data, err := io.ReadAll(f)
+	f.Close()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if len(data)%2 != 1 {
+		t.Fatal("even file")
+	}
+}
+
+func TestOddFileSize(t *testing.T) {
+	info, err := os.Stat("file.txt")
+	if err != nil {
+		t.Fatal(err)
+	}
+	if info.Size()%2 != 1 {
+		t.Fatal("even file")
+	}
+}
+
+func TestOddGetenv(t *testing.T) {
+	val := os.Getenv("TESTKEY")
+	if len(val)%2 != 1 {
+		t.Fatal("even env value")
+	}
+}
+
+func TestLookupEnv(t *testing.T) {
+	_, ok := os.LookupEnv("TESTKEY")
+	if !ok {
+		t.Fatal("env missing")
+	}
+}
+
+func TestDirList(t *testing.T) {
+	f, err := os.Open(".")
+	if err != nil {
+		t.Fatal(err)
+	}
+	f.Readdirnames(-1)
+	f.Close()
+}
+
+func TestExec(t *testing.T) {
+	// Note: not using os/exec to make sure there is no unexpected stat.
+	p, err := os.StartProcess("./script.sh", []string{"script"}, new(os.ProcAttr))
+	if err != nil {
+		t.Fatal(err)
+	}
+	ps, err := p.Wait()
+	if err != nil {
+		t.Fatal(err)
+	}
+	if !ps.Success() {
+		t.Fatalf("script failed: %v", err)
+	}
+}
+
+func TestExternalFile(t *testing.T) {
+	os.Open(os.Getenv("TEST_EXTERNAL_FILE"))
+	_, err := os.Stat(os.Getenv("TEST_EXTERNAL_FILE"))
+	if err != nil {
+		t.Fatal(err)
+	}
+}
+
+func TestOSArgs(t *testing.T) {
+	t.Log(os.Args)
+}
+-- mkold.go --
+package main
+
+import (
+	"log"
+	"os"
+	"time"
+)
+
+func main() {
+	d, err := time.ParseDuration(os.Args[1])
+	if err != nil {
+		log.Fatal(err)
+	}
+	path := os.Args[2]
+	old := time.Now().Add(-d)
+	err = os.Chtimes(path, old, old)
+	if err != nil {
+		log.Fatal(err)
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_chatty_fail.txt b/src/cmd/go/testdata/script/test_chatty_fail.txt
new file mode 100644
index 0000000..a5ef559
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_chatty_fail.txt
@@ -0,0 +1,32 @@
+# Run chatty tests. Assert on CONT lines.
+! go test chatty_test.go -v
+
+# Sanity check that output occurs.
+stdout -count=2 'this is sub-0'
+stdout -count=2 'this is sub-1'
+stdout -count=2 'this is sub-2'
+stdout -count=1 'error from sub-0'
+stdout -count=1 'error from sub-1'
+stdout -count=1 'error from sub-2'
+
+# Non-parallel tests should not print CONT.
+! stdout CONT
+
+-- chatty_test.go --
+package chatty_test
+
+import (
+	"testing"
+	"fmt"
+)
+
+func TestChatty(t *testing.T) {
+    for i := 0; i < 3; i++ {
+        t.Run(fmt.Sprintf("sub-%d", i), func(t *testing.T) {
+            for j := 0; j < 2; j++ {
+                t.Logf("this is sub-%d", i)
+            }
+            t.Errorf("error from sub-%d", i)
+        })
+    }
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_chatty_parallel_fail.txt b/src/cmd/go/testdata/script/test_chatty_parallel_fail.txt
new file mode 100644
index 0000000..3f7360b
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_chatty_parallel_fail.txt
@@ -0,0 +1,58 @@
+# Run parallel chatty tests. Assert on CONT lines. This test makes sure that
+# multiple parallel outputs have the appropriate CONT lines between them.
+! go test -parallel 3 chatty_parallel_test.go -v
+
+stdout -count=1 '^=== CONT  TestChattyParallel/sub-0\n    chatty_parallel_test.go:38: error from sub-0$'
+stdout -count=1 '^=== CONT  TestChattyParallel/sub-1\n    chatty_parallel_test.go:38: error from sub-1$'
+stdout -count=1 '^=== CONT  TestChattyParallel/sub-2\n    chatty_parallel_test.go:38: error from sub-2$'
+
+# Run parallel chatty tests with -json. Assert on CONT lines as above - make
+# sure there are CONT lines before each output line.
+! go test -json -parallel 3 chatty_parallel_test.go -v
+stdout -count=1 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-0","Output":"=== CONT  TestChattyParallel/sub-0\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-0","Output":"    chatty_parallel_test.go:38: error from sub-0\\n"}'
+stdout -count=1 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-1","Output":"=== CONT  TestChattyParallel/sub-1\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-1","Output":"    chatty_parallel_test.go:38: error from sub-1\\n"}'
+stdout -count=1 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-2","Output":"=== CONT  TestChattyParallel/sub-2\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-2","Output":"    chatty_parallel_test.go:38: error from sub-2\\n"}'
+
+-- chatty_parallel_test.go --
+package chatty_paralell_test
+
+import (
+	"testing"
+	"fmt"
+	"flag"
+)
+
+// This test ensures the the order of CONT lines in parallel chatty tests.
+func TestChattyParallel(t *testing.T) {
+	t.Parallel()
+
+	// The number of concurrent tests running. This is closely tied to the
+	// -parallel test flag, so we grab it from the flag rather than setting it
+	// to some constant.
+	parallel := flag.Lookup("test.parallel").Value.(flag.Getter).Get().(int)
+
+	// ready is a synchronization mechanism that causes subtests to execute
+	// round robin.
+	ready := make([]chan bool, parallel)
+	for i := range ready {
+		ready[i] = make(chan bool, 1)
+	}
+	ready[0] <- true
+
+	for i := range ready {
+		i := i
+		t.Run(fmt.Sprintf("sub-%d", i), func(t *testing.T) {
+			t.Parallel()
+
+			// Some basic log output to precede the failures.
+			<-ready[i]
+			t.Logf("this is sub-%d", i)
+			ready[(i+1)%len(ready)] <- true
+
+			// The actual failure messages we care about.
+			<-ready[i]
+			t.Errorf("error from sub-%d", i)
+			ready[(i+1)%len(ready)] <- true
+		})
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_chatty_parallel_success.txt b/src/cmd/go/testdata/script/test_chatty_parallel_success.txt
new file mode 100644
index 0000000..4a86d74
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_chatty_parallel_success.txt
@@ -0,0 +1,52 @@
+# Run parallel chatty tests. Assert on CONT lines. This test makes sure that
+# multiple parallel outputs have the appropriate CONT lines between them.
+go test -parallel 3 chatty_parallel_test.go -v
+stdout -count=2 '^=== CONT  TestChattyParallel/sub-0\n    chatty_parallel_test.go:32: this is sub-0$'
+stdout -count=2 '^=== CONT  TestChattyParallel/sub-1\n    chatty_parallel_test.go:32: this is sub-1$'
+stdout -count=2 '^=== CONT  TestChattyParallel/sub-2\n    chatty_parallel_test.go:32: this is sub-2$'
+
+# Run parallel chatty tests with -json. Assert on CONT lines as above - make
+# sure there are CONT lines before each output line.
+go test -json -parallel 3 chatty_parallel_test.go -v
+stdout -count=2 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-0","Output":"=== CONT  TestChattyParallel/sub-0\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-0","Output":"    chatty_parallel_test.go:32: this is sub-0\\n"}'
+stdout -count=2 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-1","Output":"=== CONT  TestChattyParallel/sub-1\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-1","Output":"    chatty_parallel_test.go:32: this is sub-1\\n"}'
+stdout -count=2 '{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-2","Output":"=== CONT  TestChattyParallel/sub-2\\n"}\n{"Time":"[0-9TZ:.+-]{20,40}","Action":"output","Package":"command-line-arguments","Test":"TestChattyParallel/sub-2","Output":"    chatty_parallel_test.go:32: this is sub-2\\n"}'
+
+-- chatty_parallel_test.go --
+package chatty_paralell_test
+
+import (
+	"testing"
+	"fmt"
+	"flag"
+)
+
+// This test ensures the the order of CONT lines in parallel chatty tests.
+func TestChattyParallel(t *testing.T) {
+	t.Parallel()
+
+	// The number of concurrent tests running. This is closely tied to the
+	// -parallel test flag, so we grab it from the flag rather than setting it
+	// to some constant.
+	parallel := flag.Lookup("test.parallel").Value.(flag.Getter).Get().(int)
+
+	// ready is a synchronization mechanism that causes subtests to execute
+	// round robin.
+	ready := make([]chan bool, parallel)
+	for i := range ready {
+		ready[i] = make(chan bool, 1)
+	}
+	ready[0] <- true
+
+	for i := range ready {
+		i := i
+		t.Run(fmt.Sprintf("sub-%d", i), func(t *testing.T) {
+			t.Parallel()
+			for j := 0; j < 2; j++ {
+				<-ready[i]
+				t.Logf("this is sub-%d", i)
+				ready[(i+1)%len(ready)] <- true
+			}
+		})
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_chatty_parallel_success_sleepy.txt b/src/cmd/go/testdata/script/test_chatty_parallel_success_sleepy.txt
new file mode 100644
index 0000000..5952a87
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_chatty_parallel_success_sleepy.txt
@@ -0,0 +1,39 @@
+# Run parallel chatty tests. Assert on CONT lines. This test makes sure that
+# multiple parallel outputs have the appropriate CONT lines between them.
+go test -parallel 3 chatty_parallel_test.go -v
+
+stdout '--- PASS: TestFast \([0-9.]{4}s\)\n=== CONT  TestSlow\n    chatty_parallel_test.go:31: this is the second TestSlow log\n--- PASS: TestSlow \([0-9.]{4}s\)'
+
+-- chatty_parallel_test.go --
+package chatty_paralell_test
+
+import (
+	"testing"
+	"time"
+)
+
+var (
+	run           = make(chan struct{})
+	afterFirstLog = make(chan struct{})
+	afterPass     = make(chan struct{})
+)
+
+func TestFast(t *testing.T) {
+	t.Parallel()
+
+	<-afterFirstLog
+	t.Cleanup(func() {
+		close(afterPass)
+	})
+}
+
+func TestSlow(t *testing.T) {
+	t.Parallel()
+
+	t.Logf("this is the first TestSlow log")
+	close(afterFirstLog)
+
+	<-afterPass
+	time.Sleep(100 * time.Millisecond)
+	t.Logf("this is the second TestSlow log")
+}
diff --git a/src/cmd/go/testdata/script/test_chatty_success.txt b/src/cmd/go/testdata/script/test_chatty_success.txt
new file mode 100644
index 0000000..8bfa569
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_chatty_success.txt
@@ -0,0 +1,27 @@
+# Run chatty tests. Assert on CONT lines.
+go test chatty_test.go -v
+
+# Non-parallel tests should not print CONT.
+! stdout CONT
+
+# The assertion is condensed into one line so that it precisely matches output,
+# rather than skipping lines and allow rogue CONT lines.
+stdout '=== RUN   TestChatty\n=== RUN   TestChatty/sub-0\n    chatty_test.go:12: this is sub-0\n    chatty_test.go:12: this is sub-0\n=== RUN   TestChatty/sub-1\n    chatty_test.go:12: this is sub-1\n    chatty_test.go:12: this is sub-1\n=== RUN   TestChatty/sub-2\n    chatty_test.go:12: this is sub-2\n    chatty_test.go:12: this is sub-2\n--- PASS: TestChatty'
+
+-- chatty_test.go --
+package chatty_test
+
+import (
+	"testing"
+	"fmt"
+)
+
+func TestChatty(t *testing.T) {
+    for i := 0; i < 3; i++ {
+        t.Run(fmt.Sprintf("sub-%d", i), func(t *testing.T) {
+            for j := 0; j < 2; j++ {
+                t.Logf("this is sub-%d", i)
+            }
+        })
+    }
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_cleanup_failnow.txt b/src/cmd/go/testdata/script/test_cleanup_failnow.txt
new file mode 100644
index 0000000..0737a93
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_cleanup_failnow.txt
@@ -0,0 +1,47 @@
+# For issue 41355
+[short] skip
+
+# This test could fail if the testing package does not wait until
+# a panicking test does the panic. Turn off multithreading, GC, and
+# async preemption to increase the probability of such a failure.
+env GOMAXPROCS=1
+env GOGC=off
+env GODEBUG=asyncpreempt=off
+
+# If the test exits with 'no tests to run', it means the testing package
+# implementation is incorrect and does not wait until a test panic.
+# If the test exits with '(?s)panic: die.*panic: die', it means
+# the testing package did an extra panic for a panicking test.
+
+! go test -v cleanup_failnow/panic_nocleanup_test.go
+! stdout 'no tests to run'
+stdout '(?s)panic: die \[recovered\].*panic: die'
+! stdout '(?s)panic: die \[recovered\].*panic: die.*panic: die'
+
+! go test -v cleanup_failnow/panic_withcleanup_test.go
+! stdout 'no tests to run'
+stdout '(?s)panic: die \[recovered\].*panic: die'
+! stdout '(?s)panic: die \[recovered\].*panic: die.*panic: die'
+
+-- cleanup_failnow/panic_nocleanup_test.go --
+package panic_nocleanup_test
+import "testing"
+func TestX(t *testing.T) {
+	t.Run("x", func(t *testing.T) {
+		panic("die")
+	})
+}
+
+-- cleanup_failnow/panic_withcleanup_test.go --
+package panic_withcleanup_test
+import "testing"
+func TestCleanupWithFailNow(t *testing.T) {
+	t.Cleanup(func() {
+		t.FailNow()
+	})
+	t.Run("x", func(t *testing.T) {
+		t.Run("y", func(t *testing.T) {
+			panic("die")
+		})
+	})
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_compile_binary.txt b/src/cmd/go/testdata/script/test_compile_binary.txt
new file mode 100644
index 0000000..63bb8ec
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_compile_binary.txt
@@ -0,0 +1,8 @@
+env GO111MODULE=off
+
+! go test -c compile_binary/...
+stderr 'build comment'
+
+-- compile_binary/foo_test.go --
+// +build foo
+package foo
diff --git a/src/cmd/go/testdata/script/test_compile_tempfile.txt b/src/cmd/go/testdata/script/test_compile_tempfile.txt
new file mode 100644
index 0000000..05f721a
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_compile_tempfile.txt
@@ -0,0 +1,11 @@
+[short] skip
+
+# Ensure that the target of 'go build -o' can be an existing, empty file so that
+# its name can be reserved using os.CreateTemp or the 'mktemp` command.
+
+go build -o empty-file$GOEXE main.go
+
+-- main.go --
+package main
+func main() {}
+-- empty-file$GOEXE --
diff --git a/src/cmd/go/testdata/script/test_deadline.txt b/src/cmd/go/testdata/script/test_deadline.txt
new file mode 100644
index 0000000..06ae16f
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_deadline.txt
@@ -0,0 +1,54 @@
+[short] skip
+
+go test -timeout=0 -run=TestNoDeadline
+go test -timeout=1m -run=TestDeadlineWithinMinute
+go test -timeout=1m -run=TestSubtestDeadlineWithinMinute
+
+-- go.mod --
+module m
+
+go 1.16
+-- deadline_test.go --
+package testing_test
+
+import (
+	"testing"
+	"time"
+)
+
+func TestNoDeadline(t *testing.T) {
+	d, ok := t.Deadline()
+	if ok || !d.IsZero() {
+		t.Fatalf("t.Deadline() = %v, %v; want 0, false", d, ok)
+	}
+}
+
+func TestDeadlineWithinMinute(t *testing.T) {
+	now := time.Now()
+	d, ok := t.Deadline()
+	if !ok || d.IsZero() {
+		t.Fatalf("t.Deadline() = %v, %v; want nonzero deadline", d, ok)
+	}
+	if !d.After(now) {
+		t.Fatalf("t.Deadline() = %v; want after start of test (%v)", d, now)
+	}
+	if d.Sub(now) > time.Minute {
+		t.Fatalf("t.Deadline() = %v; want within one minute of start of test (%v)", d, now)
+	}
+}
+
+func TestSubtestDeadlineWithinMinute(t *testing.T) {
+	t.Run("sub", func(t *testing.T) {
+		now := time.Now()
+		d, ok := t.Deadline()
+		if !ok || d.IsZero() {
+			t.Fatalf("t.Deadline() = %v, %v; want nonzero deadline", d, ok)
+		}
+		if !d.After(now) {
+			t.Fatalf("t.Deadline() = %v; want after start of test (%v)", d, now)
+		}
+		if d.Sub(now) > time.Minute {
+			t.Fatalf("t.Deadline() = %v; want within one minute of start of test (%v)", d, now)
+		}
+	})
+}
diff --git a/src/cmd/go/testdata/script/test_empty.txt b/src/cmd/go/testdata/script/test_empty.txt
new file mode 100644
index 0000000..5ebbecd
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_empty.txt
@@ -0,0 +1,53 @@
+[!race] skip
+
+cd $GOPATH/src/empty/pkg
+go test -cover -coverpkg=. -race
+
+[short] stop # Only run first case in short mode
+
+cd $GOPATH/src/empty/test
+go test -cover -coverpkg=. -race
+
+cd $GOPATH/src/empty/xtest
+go test -cover -coverpkg=. -race
+
+cd $GOPATH/src/empty/pkgtest
+go test -cover -coverpkg=. -race
+
+cd $GOPATH/src/empty/pkgxtest
+go test -cover -coverpkg=. -race
+
+cd $GOPATH/src/empty/pkgtestxtest
+go test -cover -coverpkg=. -race
+
+cd $GOPATH/src/empty/testxtest
+go test -cover -coverpkg=. -race
+
+-- empty/go.mod --
+module empty
+
+go 1.16
+-- empty/pkg/pkg.go --
+package p
+-- empty/pkgtest/pkg.go --
+package p
+-- empty/pkgtest/test_test.go --
+package p
+-- empty/pkgtestxtest/pkg.go --
+package p
+-- empty/pkgtestxtest/test_test.go --
+package p
+-- empty/pkgtestxtest/xtest_test.go --
+package p_test
+-- empty/pkgxtest/pkg.go --
+package p
+-- empty/pkgxtest/xtest_test.go --
+package p_test
+-- empty/test/test_test.go --
+package p
+-- empty/testxtest/test_test.go --
+package p
+-- empty/testxtest/xtest_test.go --
+package p_test
+-- empty/xtest/xtest_test.go --
+package p_test
diff --git a/src/cmd/go/testdata/script/test_env_term.txt b/src/cmd/go/testdata/script/test_env_term.txt
new file mode 100644
index 0000000..8a5f79a
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_env_term.txt
@@ -0,0 +1,15 @@
+# Tests golang.org/issue/12096
+
+env TERM=''
+go test test_test.go
+! stdout '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- test_test.go --
+package main
+import ("os"; "testing")
+func TestEnv(t *testing.T) {
+	if os.Getenv("TERM") != "" {
+		t.Fatal("TERM is set")
+	}
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_example_goexit.txt b/src/cmd/go/testdata/script/test_example_goexit.txt
new file mode 100644
index 0000000..984f434
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_example_goexit.txt
@@ -0,0 +1,29 @@
+# For issue golang.org/issue/41084
+[short] skip
+
+! go test -v examplegoexit
+stdout '(?s)--- PASS.*--- FAIL.*'
+stdout 'panic: test executed panic\(nil\) or runtime\.Goexit'
+
+-- go.mod --
+module examplegoexit
+
+go 1.16
+-- example_test.go --
+package main
+
+import (
+	"fmt"
+	"runtime"
+)
+
+func ExamplePass() {
+	fmt.Println("pass")
+	// Output:
+	// pass
+}
+
+func ExampleGoexit() {
+	runtime.Goexit()
+	// Output:
+}
diff --git a/src/cmd/go/testdata/script/test_exit.txt b/src/cmd/go/testdata/script/test_exit.txt
new file mode 100644
index 0000000..3703ba5
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_exit.txt
@@ -0,0 +1,131 @@
+# Builds and runs test binaries, so skip in short mode.
+[short] skip
+
+env GO111MODULE=on
+
+# If a test invoked by 'go test' exits with a zero status code,
+# it will panic.
+! go test ./zero
+! stdout ^ok
+! stdout 'exit status'
+stdout 'panic'
+stdout ^FAIL
+
+# If a test exits with a non-zero status code, 'go test' fails normally.
+! go test ./one
+! stdout ^ok
+stdout 'exit status'
+! stdout 'panic'
+stdout ^FAIL
+
+# Ensure that other flags still do the right thing.
+go test -list=. ./zero
+stdout ExitZero
+
+! go test -bench=. ./zero
+stdout 'panic'
+
+# 'go test' with no args streams output without buffering. Ensure that it still
+# catches a zero exit with missing output.
+cd zero
+! go test
+stdout 'panic'
+cd ../normal
+go test
+stdout ^ok
+cd ..
+
+# If a TestMain exits with a zero status code, 'go test' shouldn't
+# complain about that. It's a common way to skip testing a package
+# entirely.
+go test ./main_zero
+! stdout 'skipping all tests'
+stdout ^ok
+
+# With -v, we'll see the warning from TestMain.
+go test -v ./main_zero
+stdout 'skipping all tests'
+stdout ^ok
+
+# Listing all tests won't actually give a result if TestMain exits. That's okay,
+# because this is how TestMain works. If we decide to support -list even when
+# TestMain is used to skip entire packages, we can change this test case.
+go test -list=. ./main_zero
+stdout 'skipping all tests'
+! stdout TestNotListed
+
+# Running the test directly still fails, if we pass the flag.
+go test -c -o ./zero.exe ./zero
+! exec ./zero.exe -test.paniconexit0
+
+# Using -json doesn't affect the exit status.
+! go test -json ./zero
+! stdout '"Output":"ok'
+! stdout 'exit status'
+stdout 'panic'
+stdout '"Output":"FAIL'
+
+# Running the test via test2json also fails.
+! go tool test2json ./zero.exe -test.v -test.paniconexit0
+! stdout '"Output":"ok'
+! stdout 'exit status'
+stdout 'panic'
+
+-- go.mod --
+module m
+
+-- ./normal/normal.go --
+package normal
+-- ./normal/normal_test.go --
+package normal
+
+import "testing"
+
+func TestExitZero(t *testing.T) {
+}
+
+-- ./zero/zero.go --
+package zero
+-- ./zero/zero_test.go --
+package zero
+
+import (
+	"os"
+	"testing"
+)
+
+func TestExitZero(t *testing.T) {
+	os.Exit(0)
+}
+
+-- ./one/one.go --
+package one
+-- ./one/one_test.go --
+package one
+
+import (
+	"os"
+	"testing"
+)
+
+func TestExitOne(t *testing.T) {
+	os.Exit(1)
+}
+
+-- ./main_zero/zero.go --
+package zero
+-- ./main_zero/zero_test.go --
+package zero
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	fmt.Println("skipping all tests")
+	os.Exit(0)
+}
+
+func TestNotListed(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/test_fail_fast.txt b/src/cmd/go/testdata/script/test_fail_fast.txt
new file mode 100644
index 0000000..132ea70
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_fail_fast.txt
@@ -0,0 +1,113 @@
+[short] skip
+
+# test fail fast
+! go test ./failfast_test.go -run='TestFailingA' -failfast=true
+stdout -count=1 'FAIL - '
+! go test ./failfast_test.go -run='TestFailing[AB]' -failfast=true
+stdout -count=1 'FAIL - '
+! go test ./failfast_test.go -run='TestFailing[AB]' -failfast=false
+stdout -count=2 'FAIL - '
+
+# mix with non-failing tests
+! go test ./failfast_test.go -run='TestA|TestFailing[AB]' -failfast=true
+stdout -count=1 'FAIL - '
+! go test ./failfast_test.go -run='TestA|TestFailing[AB]' -failfast=false
+stdout -count=2 'FAIL - '
+
+# mix with parallel tests
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailingA' -failfast=true
+stdout -count=2 'FAIL - '
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailingA' -failfast=false
+stdout -count=2 'FAIL - '
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailing[AB]' -failfast=true
+stdout -count=3 'FAIL - '
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailing[AB]' -failfast=false
+stdout -count=3 'FAIL - '
+
+# mix with parallel sub-tests
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailing[AB]|TestParallelFailingSubtestsA' -failfast=true
+stdout -count=3 'FAIL - '
+! go test ./failfast_test.go -run='TestFailingB|TestParallelFailing[AB]|TestParallelFailingSubtestsA' -failfast=false
+stdout -count=5 'FAIL - '
+! go test ./failfast_test.go -run='TestParallelFailingSubtestsA' -failfast=true
+stdout -count=1 'FAIL - '
+
+# only parallels
+! go test ./failfast_test.go -run='TestParallelFailing[AB]' -failfast=false
+stdout -count=2 'FAIL - '
+
+# non-parallel subtests
+! go test ./failfast_test.go -run='TestFailingSubtestsA' -failfast=true
+stdout -count=1 'FAIL - '
+! go test ./failfast_test.go -run='TestFailingSubtestsA' -failfast=false
+stdout -count=2 'FAIL - '
+
+# fatal test
+! go test ./failfast_test.go -run='TestFatal[CD]' -failfast=true
+stdout -count=1 'FAIL - '
+! go test ./failfast_test.go -run='TestFatal[CD]' -failfast=false
+stdout -count=2 'FAIL - '
+
+-- failfast_test.go --
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package failfast
+
+import "testing"
+
+func TestA(t *testing.T) {
+	// Edge-case testing, mixing unparallel tests too
+	t.Logf("LOG: %s", t.Name())
+}
+
+func TestFailingA(t *testing.T) {
+	t.Errorf("FAIL - %s", t.Name())
+}
+
+func TestB(t *testing.T) {
+	// Edge-case testing, mixing unparallel tests too
+	t.Logf("LOG: %s", t.Name())
+}
+
+func TestParallelFailingA(t *testing.T) {
+	t.Parallel()
+	t.Errorf("FAIL - %s", t.Name())
+}
+
+func TestParallelFailingB(t *testing.T) {
+	t.Parallel()
+	t.Errorf("FAIL - %s", t.Name())
+}
+
+func TestParallelFailingSubtestsA(t *testing.T) {
+	t.Parallel()
+	t.Run("TestFailingSubtestsA1", func(t *testing.T) {
+		t.Errorf("FAIL - %s", t.Name())
+	})
+	t.Run("TestFailingSubtestsA2", func(t *testing.T) {
+		t.Errorf("FAIL - %s", t.Name())
+	})
+}
+
+func TestFailingSubtestsA(t *testing.T) {
+	t.Run("TestFailingSubtestsA1", func(t *testing.T) {
+		t.Errorf("FAIL - %s", t.Name())
+	})
+	t.Run("TestFailingSubtestsA2", func(t *testing.T) {
+		t.Errorf("FAIL - %s", t.Name())
+	})
+}
+
+func TestFailingB(t *testing.T) {
+	t.Errorf("FAIL - %s", t.Name())
+}
+
+func TestFatalC(t *testing.T) {
+	t.Fatalf("FAIL - %s", t.Name())
+}
+
+func TestFatalD(t *testing.T) {
+	t.Fatalf("FAIL - %s", t.Name())
+}
diff --git a/src/cmd/go/testdata/script/test_flag.txt b/src/cmd/go/testdata/script/test_flag.txt
new file mode 100644
index 0000000..0142b3f
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_flag.txt
@@ -0,0 +1,40 @@
+[short] skip
+
+go test flag_test.go -v -args -v=7 # Two distinct -v flags
+go test -v flag_test.go -args -v=7 # Two distinct -v flags
+
+# Using a custom flag mixed with regular 'go test' flags should be OK.
+go test -count=1 -custom -args -v=7
+
+# However, it should be an error to use custom flags when -i or -c are used,
+# since we know for sure that no test binary will run at all.
+! go test -i -custom
+stderr '^go test: unknown flag -custom cannot be used with -i$'
+! go test -c -custom
+stderr '^go test: unknown flag -custom cannot be used with -c$'
+
+# The same should apply even if -c or -i come after a custom flag.
+! go test -custom -c
+stderr '^go test: unknown flag -custom cannot be used with -c$'
+
+-- go.mod --
+module m
+-- flag_test.go --
+package flag_test
+
+import (
+	"flag"
+	"log"
+	"testing"
+)
+
+var v = flag.Int("v", 0, "v flag")
+
+var custom = flag.Bool("custom", false, "")
+
+// Run this as go test pkg -v=7
+func TestVFlagIsSet(t *testing.T) {
+	if *v != 7 {
+		log.Fatal("v flag not set")
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_flags.txt b/src/cmd/go/testdata/script/test_flags.txt
new file mode 100644
index 0000000..63385e6
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_flags.txt
@@ -0,0 +1,132 @@
+env GO111MODULE=on
+
+[short] skip
+
+# Arguments after the flag terminator should be ignored.
+# If we pass '-- -test.v', we should not get verbose output
+# *and* output from the test should not be echoed.
+go test ./x -- -test.v
+stdout '\Aok\s+example.com/x\s+[0-9.s]+\n\z'
+! stderr .
+
+# For backward-compatibility with previous releases of the 'go' command,
+# arguments that appear after unrecognized flags should not be treated
+# as packages, even if they are unambiguously not arguments to flags.
+# Even though ./x looks like a package path, the real package should be
+# the implicit '.'.
+! go test --answer=42 ./x
+stderr '^no Go files in .+$'
+! stderr '/x'
+
+# However, *flags* that appear after unrecognized flags should still be
+# interpreted as flags, under the (possibly-erroneous) assumption that
+# unrecognized flags are non-boolean.
+
+go test -v -x ./x -timeout 24h -boolflag=true foo -timeout 25h
+stdout 'args: foo -timeout 25h'
+stdout 'timeout: 24h0m0s$'  # -timeout is unambiguously not a flag, so the real flag wins.
+
+go test -v -x ./x -timeout 24h -boolflag foo -timeout 25h
+stdout 'args: foo -test\.timeout=25h0m0s'  # For legacy reasons, '-timeout ' is erroneously rewritten to -test.timeout; see https://golang.org/issue/40763.
+stdout 'timeout: 24h0m0s$'  # Actual flag wins.
+
+go test -v -x ./x -timeout 24h -stringflag foo -timeout 25h
+stdout 'args: $'
+stdout 'timeout: 25h0m0s$'  # Later flag wins.
+
+# An explicit '-outputdir=' argument should set test.outputdir
+# to the 'go' command's working directory, not zero it out
+# for the test binary.
+go test -x -coverprofile=cover.out '-outputdir=' ./x
+stderr '-test.outputdir=[^ ]'
+exists ./cover.out
+! exists ./x/cover.out
+
+# Test flags from GOFLAGS should be forwarded to the test binary,
+# with the 'test.' prefix in the GOFLAGS entry...
+env GOFLAGS='-test.timeout=24h0m0s -count=1'
+go test -v -x ./x
+stdout 'timeout: 24h0m0s$'
+stderr '-test.count=1'
+
+# ...or without.
+env GOFLAGS='-timeout=24h0m0s -count=1'
+go test -v -x ./x
+stdout 'timeout: 24h0m0s$'
+stderr '-test.count=1'
+
+# Arguments from the command line should override GOFLAGS...
+go test -v -x -timeout=25h0m0s ./x
+stdout 'timeout: 25h0m0s$'
+stderr '-test.count=1'
+
+# ...even if they use a different flag name.
+go test -v -x -test.timeout=26h0m0s ./x
+stdout 'timeout: 26h0m0s$'
+stderr '-test\.timeout=26h0m0s'
+! stderr 'timeout=24h0m0s'
+stderr '-test.count=1'
+
+# Invalid flags should be reported exactly once.
+! go test -covermode=walrus ./x
+stderr -count=1 'invalid value "walrus" for flag -covermode: valid modes are .*$'
+stderr '^usage: go test .*$'
+stderr '^Run ''go help test'' and ''go help testflag'' for details.$'
+
+# Passing -help to the test binary should show flag help.
+go test ./x -args -help
+stdout 'usage_message'
+
+# -covermode, -coverpkg, and -coverprofile should imply -cover
+go test -covermode=set ./x
+stdout '\s+coverage:\s+'
+
+go test -coverpkg=encoding/binary ./x
+stdout '\s+coverage:\s+'
+
+go test -coverprofile=cover.out ./x
+stdout '\s+coverage:\s+'
+exists ./cover.out
+rm ./cover.out
+
+# -*profile and -trace flags should force output to the current working directory
+# or -outputdir, not the directory containing the test.
+
+go test -memprofile=mem.out ./x
+exists ./mem.out
+rm ./mem.out
+
+go test -trace=trace.out ./x
+exists ./trace.out
+rm ./trace.out
+
+# Relative paths with -outputdir should be relative to the go command's working
+# directory, not the directory containing the test.
+mkdir profiles
+go test -memprofile=mem.out -outputdir=./profiles ./x
+exists ./profiles/mem.out
+rm profiles
+
+-- go.mod --
+module example.com
+go 1.14
+-- x/x_test.go --
+package x
+
+import (
+	"flag"
+	"strings"
+	"testing"
+)
+
+var _ = flag.String("usage_message", "", "dummy flag to check usage message")
+var boolflag = flag.Bool("boolflag", false, "ignored boolean flag")
+var stringflag = flag.String("stringflag", "", "ignored string flag")
+
+func TestLogTimeout(t *testing.T) {
+	t.Logf("timeout: %v", flag.Lookup("test.timeout").Value)
+}
+
+func TestLogArgs(t *testing.T) {
+	t.Logf("args: %s", strings.Join(flag.Args(), " "))
+}
diff --git a/src/cmd/go/testdata/script/test_generated_main.txt b/src/cmd/go/testdata/script/test_generated_main.txt
new file mode 100644
index 0000000..2e991a5
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_generated_main.txt
@@ -0,0 +1,34 @@
+# Tests that the generated test main file has a generated code comment.
+# This is needed by analyzers that access source files through 'go list'.
+# Verifies golang.org/issue/31971.
+# TODO(jayconrod): This test is brittle. We should write _testmain.go as
+# a build action instead of with an ad-hoc WriteFile call
+# in internal/test/test.go. Then we could just grep 'go get -n'.
+go test x_test.go
+
+-- x_test.go --
+package x
+
+import (
+	"os"
+	"path/filepath"
+	"regexp"
+	"testing"
+)
+
+func Test(t *testing.T) {
+	exePath, err := os.Executable()
+	if err != nil {
+		t.Fatal(err)
+	}
+	testmainPath := filepath.Join(filepath.Dir(exePath), "_testmain.go")
+	source, err := os.ReadFile(testmainPath)
+	if err != nil {
+		t.Fatal(err)
+	}
+	if matched, err := regexp.Match(`(?m)^// Code generated .* DO NOT EDIT\.$`, source); err != nil {
+		t.Fatal(err)
+	} else if !matched {
+		t.Error("_testmain.go does not have generated code comment")
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_go111module_cache.txt b/src/cmd/go/testdata/script/test_go111module_cache.txt
new file mode 100644
index 0000000..ca1de43
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_go111module_cache.txt
@@ -0,0 +1,15 @@
+env GO111MODULE=on
+go mod init foo
+go test
+stdout ^ok\s+foo
+env GO111MODULE=off
+go test
+stdout ^ok\s+
+! stdout ^ok\s+(cache)$
+
+-- main_test.go --
+package main
+
+import "testing"
+
+func TestF(t *testing.T) {}
diff --git a/src/cmd/go/testdata/script/test_import_error_stack.txt b/src/cmd/go/testdata/script/test_import_error_stack.txt
new file mode 100644
index 0000000..6c60f3d
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_import_error_stack.txt
@@ -0,0 +1,31 @@
+env GO111MODULE=off
+! go test testdep/p1
+stderr 'package testdep/p1 \(test\)\n\timports testdep/p2\n\timports testdep/p3: build constraints exclude all Go files ' # check for full import stack
+! go vet testdep/p1
+stderr 'package testdep/p1 \(test\)\n\timports testdep/p2\n\timports testdep/p3: build constraints exclude all Go files ' # check for full import stack
+
+env GO111MODULE=on
+cd testdep
+! go test testdep/p1
+stderr 'package testdep/p1 \(test\)\n\timports testdep/p2\n\timports testdep/p3: build constraints exclude all Go files ' # check for full import stack
+! go vet testdep/p1
+stderr 'package testdep/p1 \(test\)\n\timports testdep/p2\n\timports testdep/p3: build constraints exclude all Go files ' # check for full import stack
+
+-- testdep/go.mod --
+module testdep
+
+go 1.16
+-- testdep/p1/p1.go --
+package p1
+-- testdep/p1/p1_test.go --
+package p1
+
+import _ "testdep/p2"
+-- testdep/p2/p2.go --
+package p2
+
+import _ "testdep/p3"
+-- testdep/p3/p3.go --
+// +build ignore
+
+package ignored
diff --git a/src/cmd/go/testdata/script/test_json.txt b/src/cmd/go/testdata/script/test_json.txt
new file mode 100644
index 0000000..cd5b0b9
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_json.txt
@@ -0,0 +1,74 @@
+[gccgo] skip # gccgo does not have standard packages
+[short] skip
+
+env GOCACHE=$WORK/tmp
+
+# Run go test -json on errors m/empty/pkg and m/skipper
+# It would be nice to test that the output is interlaced
+# but it seems to be impossible to do that in a short test
+# that isn't also flaky. Just check that we get JSON output.
+go test -json -short -v errors m/empty/pkg m/skipper
+
+# Check errors for run action
+stdout '"Package":"errors"'
+stdout '"Action":"run","Package":"errors"'
+
+# Check m/empty/pkg for output and skip actions
+stdout '"Action":"output","Package":"m/empty/pkg","Output":".*no test files'
+stdout '"Action":"skip","Package":"m/empty/pkg"'
+
+# Check skipper for output and skip actions
+stdout '"Action":"output","Package":"m/skipper","Test":"Test","Output":"--- SKIP:'
+stdout '"Action":"skip","Package":"m/skipper","Test":"Test"'
+
+# Run go test -json on errors and check it's cached
+go test -json -short -v errors
+stdout '"Action":"output","Package":"errors","Output":".*\(cached\)'
+
+go test -json -bench=NONE -short -v errors
+stdout '"Package":"errors"'
+stdout '"Action":"run"'
+
+# Test running test2json
+go test -o $WORK/tmp/errors.test$GOEXE -c errors
+go tool test2json -p errors $WORK/tmp/errors.test$GOEXE -test.v -test.short
+stdout '"Package":"errors"'
+stdout '"Action":"run"'
+stdout '\{"Action":"pass","Package":"errors"\}'
+
+-- go.mod --
+module m
+
+go 1.16
+-- skipper/skip_test.go --
+package skipper
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Skip("skipping")
+}
+-- empty/pkg/pkg.go --
+package p
+-- empty/pkgtest/pkg.go --
+package p
+-- empty/pkgtest/test_test.go --
+package p
+-- empty/pkgtestxtest/pkg.go --
+package p
+-- empty/pkgtestxtest/test_test.go --
+package p
+-- empty/pkgtestxtest/xtest_test.go --
+package p_test
+-- empty/pkgxtest/pkg.go --
+package p
+-- empty/pkgxtest/xtest_test.go --
+package p_test
+-- empty/test/test_test.go --
+package p
+-- empty/testxtest/test_test.go --
+package p
+-- empty/testxtest/xtest_test.go --
+package p_test
+-- empty/xtest/xtest_test.go --
+package p_test
diff --git a/src/cmd/go/testdata/script/test_json_exit.txt b/src/cmd/go/testdata/script/test_json_exit.txt
new file mode 100644
index 0000000..dc7ffb0
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_json_exit.txt
@@ -0,0 +1,102 @@
+[short] skip
+
+go test -c -o mainpanic.exe ./mainpanic &
+go test -c -o mainexit0.exe ./mainexit0 &
+go test -c -o testpanic.exe ./testpanic &
+go test -c -o testbgpanic.exe ./testbgpanic &
+wait
+
+# Test binaries that panic in TestMain should be marked as failing.
+
+! go test -json ./mainpanic
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+! go tool test2json ./mainpanic.exe
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+# Test binaries that exit with status 0 should be marked as passing.
+
+go test -json ./mainexit0
+stdout '"Action":"pass"'
+! stdout '"Action":"fail"'
+
+go tool test2json ./mainexit0.exe
+stdout '"Action":"pass"'
+! stdout '"Action":"fail"'
+
+# Test functions that panic should never be marked as passing
+# (https://golang.org/issue/40132).
+
+! go test -json ./testpanic
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+! go tool test2json ./testpanic.exe -test.v
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+! go tool test2json ./testpanic.exe
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+# Tests that panic in a background goroutine should be marked as failing.
+
+! go test -json ./testbgpanic
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+! go tool test2json ./testbgpanic.exe -test.v
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+! go tool test2json ./testbgpanic.exe
+stdout '"Action":"fail"'
+! stdout '"Action":"pass"'
+
+-- go.mod --
+module m
+go 1.14
+-- mainpanic/mainpanic_test.go --
+package mainpanic_test
+
+import "testing"
+
+func TestMain(m *testing.M) {
+	panic("haha no")
+}
+-- mainexit0/mainexit0_test.go --
+package mainexit0_test
+
+import (
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	fmt.Println("nothing to do")
+	os.Exit(0)
+}
+-- testpanic/testpanic_test.go --
+package testpanic_test
+
+import "testing"
+
+func TestPanic(*testing.T) {
+	panic("haha no")
+}
+-- testbgpanic/testbgpanic_test.go --
+package testbgpanic_test
+
+import "testing"
+
+func TestPanicInBackground(*testing.T) {
+	c := make(chan struct{})
+	go func() {
+		panic("haha no")
+		close(c)
+	}()
+	<-c
+}
diff --git a/src/cmd/go/testdata/script/test_json_interleaved.txt b/src/cmd/go/testdata/script/test_json_interleaved.txt
new file mode 100644
index 0000000..e2d349e
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_json_interleaved.txt
@@ -0,0 +1,27 @@
+# Regression test for https://golang.org/issue/40657: output from the main test
+# function should be attributed correctly even if interleaved with the PAUSE
+# line for a new parallel subtest.
+
+[short] skip
+
+go test -json
+stdout '"Test":"TestWeirdTiming","Output":"[^"]* logging to outer again\\n"'
+
+-- go.mod --
+module example.com
+go 1.15
+-- main_test.go --
+package main
+
+import (
+	"testing"
+)
+
+func TestWeirdTiming(outer *testing.T) {
+	outer.Run("pauser", func(pauser *testing.T) {
+		outer.Logf("logging to outer")
+		pauser.Parallel()
+	})
+
+	outer.Logf("logging to outer again")
+}
diff --git a/src/cmd/go/testdata/script/test_json_panic_exit.txt b/src/cmd/go/testdata/script/test_json_panic_exit.txt
new file mode 100644
index 0000000..d0a7991
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_json_panic_exit.txt
@@ -0,0 +1,69 @@
+# Verifies golang.org/issue/37555.
+
+[short] skip
+
+# 'go test -json' should say a test passes if it says it passes.
+go test -json ./pass
+stdout '"Action":"pass".*\n\z'
+! stdout '"Test":.*\n\z'
+
+# 'go test -json' should say a test passes if it exits 0 and prints nothing.
+# TODO(golang.org/issue/29062): this should fail in the future.
+go test -json ./exit0main
+stdout '"Action":"pass".*\n\z'
+! stdout '"Test":.*\n\z'
+
+# 'go test -json' should say a test fails if it exits 1 and prints nothing.
+! go test -json ./exit1main
+stdout '"Action":"fail".*\n\z'
+! stdout '"Test":.*\n\z'
+
+# 'go test -json' should say a test fails if it panics.
+! go test -json ./panic
+stdout '"Action":"fail".*\n\z'
+! stdout '"Test":.*\n\z'
+
+-- go.mod --
+module example.com/test
+
+go 1.14
+
+-- pass/pass_test.go --
+package pass_test
+
+import "testing"
+
+func TestPass(t *testing.T) {}
+
+-- exit0main/exit0main_test.go --
+package exit0_test
+
+import (
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(0)
+}
+
+-- exit1main/exit1main_test.go --
+package exit1_test
+
+import (
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	os.Exit(1)
+}
+
+-- panic/panic_test.go --
+package panic_test
+
+import "testing"
+
+func TestPanic(t *testing.T) {
+	panic("oh no")
+}
diff --git a/src/cmd/go/testdata/script/test_main.txt b/src/cmd/go/testdata/script/test_main.txt
new file mode 100644
index 0000000..25d02e4
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_main.txt
@@ -0,0 +1,92 @@
+# Test TestMain
+go test standalone_main_normal_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+# Test TestMain sees testing flags
+go test standalone_testmain_flag_test.go
+stdout '^ok.*\[no tests to run\]'
+
+# Test TestMain with wrong signature (Issue #22388)
+! go test standalone_main_wrong_test.go
+stderr 'wrong signature for TestMain, must be: func TestMain\(m \*testing.M\)'
+
+# Test TestMain does not call os.Exit (Issue #34129)
+! go test standalone_testmain_not_call_os_exit_test.go
+! stdout '^ok'
+
+-- standalone_main_normal_test.go --
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package standalone_main_normal_test
+
+import "testing"
+
+func TestMain(t *testing.T) {
+}
+-- standalone_main_wrong_test.go --
+// Copyright 2017 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package standalone_main_wrong_test
+
+import "testing"
+
+func TestMain(m *testing.Main) {
+}
+-- standalone_testmain_flag_test.go --
+// Copyright 2019 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package standalone_testmain_flag_test
+
+import (
+	"flag"
+	"fmt"
+	"os"
+	"testing"
+)
+
+func TestMain(m *testing.M) {
+	// A TestMain should be able to access testing flags if it calls
+	// flag.Parse without needing to use testing.Init.
+	flag.Parse()
+	found := false
+	flag.VisitAll(func(f *flag.Flag) {
+		if f.Name == "test.count" {
+			found = true
+		}
+	})
+	if !found {
+		fmt.Println("testing flags not registered")
+		os.Exit(1)
+	}
+	os.Exit(m.Run())
+}
+-- standalone_testmain_not_call_os_exit_test.go --
+// Copyright 2020 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+package standalone_testmain_not_call_os_exit_test
+
+import (
+	"testing"
+)
+
+func TestWillFail(t *testing.T) {
+	t.Error("this test will fail.")
+}
+
+func TestMain(m *testing.M) {
+	defer func() {
+		recover()
+	}()
+	exit := m.Run()
+	panic(exit)
+}
diff --git a/src/cmd/go/testdata/script/test_main_archive.txt b/src/cmd/go/testdata/script/test_main_archive.txt
new file mode 100644
index 0000000..410d923
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_main_archive.txt
@@ -0,0 +1,32 @@
+env GO111MODULE=off
+
+# Test that a main_test of 'package main' imports the package,
+# not the installed binary.
+
+[short] skip
+
+env GOBIN=$WORK/bin
+go test main_test
+go install main_test
+
+go list -f '{{.Stale}}' main_test
+stdout false
+
+go test main_test
+
+-- main_test/m.go --
+package main
+
+func F()    {}
+func main() {}
+-- main_test/m_test.go --
+package main_test
+
+import (
+	. "main_test"
+	"testing"
+)
+
+func Test1(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/test_main_panic.txt b/src/cmd/go/testdata/script/test_main_panic.txt
new file mode 100644
index 0000000..45887c5
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_main_panic.txt
@@ -0,0 +1,30 @@
+[short] skip
+[!race] skip
+
+! go test -v -race main_panic/testmain_parallel_sub_panic_test.go
+! stdout 'DATA RACE'
+-- main_panic/testmain_parallel_sub_panic_test.go --
+package testmain_parallel_sub_panic_test
+
+import "testing"
+
+func setup()    { println("setup()") }
+func teardown() { println("teardown()") }
+func TestA(t *testing.T) {
+	t.Run("1", func(t *testing.T) {
+		t.Run("1", func(t *testing.T) {
+			t.Parallel()
+			panic("A/1/1 panics")
+		})
+		t.Run("2", func(t *testing.T) {
+			t.Parallel()
+			println("A/1/2 is ok")
+		})
+	})
+}
+
+func TestMain(m *testing.M) {
+	setup()
+	defer teardown()
+	m.Run()
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_main_twice.txt b/src/cmd/go/testdata/script/test_main_twice.txt
new file mode 100644
index 0000000..f32d4fc
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_main_twice.txt
@@ -0,0 +1,27 @@
+[short] skip
+
+env GOCACHE=$WORK/tmp
+go test -v multimain
+stdout -count=2 notwithstanding # check tests ran twice
+
+-- go.mod --
+module multimain
+
+go 1.16
+-- multimain_test.go --
+package multimain_test
+
+import "testing"
+
+func TestMain(m *testing.M) {
+	// Some users run m.Run multiple times, changing
+	// some kind of global state between runs.
+	// This used to work so I guess now it has to keep working.
+	// See golang.org/issue/23129.
+	m.Run()
+	m.Run()
+}
+
+func Test(t *testing.T) {
+	t.Log("notwithstanding")
+}
diff --git a/src/cmd/go/testdata/script/test_match_benchmark_labels.txt b/src/cmd/go/testdata/script/test_match_benchmark_labels.txt
new file mode 100644
index 0000000..13c4007
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_benchmark_labels.txt
@@ -0,0 +1,18 @@
+# Benchmark labels, file outside gopath
+# TODO(matloob): This test was called TestBenchmarkLabelsOutsideGOPATH
+# why "OutsideGOPATH"? Does the go command need to be run outside GOPATH?
+# Do the files need to exist outside GOPATH?
+cp $GOPATH/src/standalone_benchmark_test.go $WORK/tmp/standalone_benchmark_test.go
+go test -run '^$' -bench . $WORK/tmp/standalone_benchmark_test.go
+stdout '^goos: '$GOOS
+stdout '^goarch: '$GOARCH
+! stdout '^pkg:'
+! stderr '^pkg:'
+
+-- standalone_benchmark_test.go --
+package standalone_benchmark
+
+import "testing"
+
+func Benchmark(b *testing.B) {
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_no_benchmarks.txt b/src/cmd/go/testdata/script/test_match_no_benchmarks.txt
new file mode 100644
index 0000000..30f4be8
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_benchmarks.txt
@@ -0,0 +1,13 @@
+# Matches no benchmarks
+go test -run '^$' -bench ThisWillNotMatch standalone_benchmark_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- standalone_benchmark_test.go --
+package standalone_benchmark
+
+import "testing"
+
+func Benchmark(b *testing.B) {
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_no_subtests.txt b/src/cmd/go/testdata/script/test_match_no_subtests.txt
new file mode 100644
index 0000000..7abb1eb
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_subtests.txt
@@ -0,0 +1,12 @@
+# The subtests don't match
+go test -run Test/ThisWillNotMatch standalone_sub_test.go
+stdout '^ok.*\[no tests to run\]'
+
+-- standalone_sub_test.go --
+package standalone_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Run("Sub", func(t *testing.T) {})
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_no_subtests_failure.txt b/src/cmd/go/testdata/script/test_match_no_subtests_failure.txt
new file mode 100644
index 0000000..b3c5b92
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_subtests_failure.txt
@@ -0,0 +1,15 @@
+# Matches no subtests, but parent test still fails
+! go test -run TestThatFails/ThisWillNotMatch standalone_fail_sub_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout 'FAIL'
+
+-- standalone_fail_sub_test.go --
+package standalone_fail_sub_test
+
+import "testing"
+
+func TestThatFails(t *testing.T) {
+	t.Run("Sub", func(t *testing.T) {})
+	t.Fail()
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_no_subtests_parallel.txt b/src/cmd/go/testdata/script/test_match_no_subtests_parallel.txt
new file mode 100644
index 0000000..11c734c
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_subtests_parallel.txt
@@ -0,0 +1,19 @@
+# Matches no subtests, parallel
+go test -run Test/Sub/ThisWillNotMatch standalone_parallel_sub_test.go
+stdout '^ok.*\[no tests to run\]'
+
+-- standalone_parallel_sub_test.go --
+package standalone_parallel_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	ch := make(chan bool, 1)
+	t.Run("Sub", func(t *testing.T) {
+		t.Parallel()
+		<-ch
+		t.Run("Nested", func(t *testing.T) {})
+	})
+	// Ensures that Sub will finish after its t.Run call already returned.
+	ch <- true
+}
diff --git a/src/cmd/go/testdata/script/test_match_no_tests.txt b/src/cmd/go/testdata/script/test_match_no_tests.txt
new file mode 100644
index 0000000..1ad2097
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_tests.txt
@@ -0,0 +1,11 @@
+# Matches no tests
+go test -run ThisWillNotMatch standalone_test.go
+stdout '^ok.*\[no tests to run\]'
+
+-- standalone_test.go --
+package standalone_test
+
+import "testing"
+
+func Test(t *testing.T) {
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_no_tests_build_failure.txt b/src/cmd/go/testdata/script/test_match_no_tests_build_failure.txt
new file mode 100644
index 0000000..e1c9643
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_tests_build_failure.txt
@@ -0,0 +1,19 @@
+# Test that when there's a build failure and a -run flag that doesn't match,
+# that the error for not matching tests does not override the error for
+# the build failure.
+
+! go test -run ThisWillNotMatch syntaxerror
+! stderr '(?m)^ok.*\[no tests to run\]'
+stdout 'FAIL'
+
+-- go.mod --
+module syntaxerror
+
+go 1.16
+-- x.go --
+package p
+-- x_test.go --
+package p
+
+func f() (x.y, z int) {
+}
diff --git a/src/cmd/go/testdata/script/test_match_no_tests_with_subtests.txt b/src/cmd/go/testdata/script/test_match_no_tests_with_subtests.txt
new file mode 100644
index 0000000..0d94918
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_no_tests_with_subtests.txt
@@ -0,0 +1,12 @@
+# Matches no tests with subtests
+go test -run ThisWillNotMatch standalone_sub_test.go
+stdout '^ok.*\[no tests to run\]'
+
+-- standalone_sub_test.go --
+package standalone_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Run("Sub", func(t *testing.T) {})
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_only_benchmarks.txt b/src/cmd/go/testdata/script/test_match_only_benchmarks.txt
new file mode 100644
index 0000000..5dfb96e
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_only_benchmarks.txt
@@ -0,0 +1,13 @@
+# Matches only benchmarks
+go test -run '^$' -bench . standalone_benchmark_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- standalone_benchmark_test.go --
+package standalone_benchmark
+
+import "testing"
+
+func Benchmark(b *testing.B) {
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_only_example.txt b/src/cmd/go/testdata/script/test_match_only_example.txt
new file mode 100644
index 0000000..515ccb3
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_only_example.txt
@@ -0,0 +1,31 @@
+[short] skip
+
+# Check that it's okay for test pattern to match only examples.
+go test -run Example example1_test.go
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- example1_test.go --
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Make sure that go test runs Example_Z before Example_A, preserving source order.
+
+package p
+
+import "fmt"
+
+var n int
+
+func Example_Z() {
+	n++
+	fmt.Println(n)
+	// Output: 1
+}
+
+func Example_A() {
+	n++
+	fmt.Println(n)
+	// Output: 2
+}
diff --git a/src/cmd/go/testdata/script/test_match_only_subtests.txt b/src/cmd/go/testdata/script/test_match_only_subtests.txt
new file mode 100644
index 0000000..beea895
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_only_subtests.txt
@@ -0,0 +1,14 @@
+# Matches only subtests
+go test -run Test/Sub standalone_sub_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- standalone_sub_test.go --
+package standalone_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Run("Sub", func(t *testing.T) {})
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_match_only_subtests_parallel.txt b/src/cmd/go/testdata/script/test_match_only_subtests_parallel.txt
new file mode 100644
index 0000000..11872c2
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_only_subtests_parallel.txt
@@ -0,0 +1,21 @@
+# Matches only subtests, parallel
+go test -run Test/Sub/Nested standalone_parallel_sub_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- standalone_parallel_sub_test.go --
+package standalone_parallel_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	ch := make(chan bool, 1)
+	t.Run("Sub", func(t *testing.T) {
+		t.Parallel()
+		<-ch
+		t.Run("Nested", func(t *testing.T) {})
+	})
+	// Ensures that Sub will finish after its t.Run call already returned.
+	ch <- true
+}
diff --git a/src/cmd/go/testdata/script/test_match_only_tests.txt b/src/cmd/go/testdata/script/test_match_only_tests.txt
new file mode 100644
index 0000000..9185793
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_match_only_tests.txt
@@ -0,0 +1,13 @@
+# Matches only tests
+go test -run Test standalone_test.go
+! stdout '^ok.*\[no tests to run\]'
+! stderr '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- standalone_test.go --
+package standalone_test
+
+import "testing"
+
+func Test(t *testing.T) {
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_minus_n.txt b/src/cmd/go/testdata/script/test_minus_n.txt
new file mode 100644
index 0000000..9900dbc
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_minus_n.txt
@@ -0,0 +1,14 @@
+# The intent here is to verify that 'go test -n' works without crashing.
+# Any test will do.
+
+go test -n x_test.go
+
+-- x_test.go --
+package x_test
+
+import (
+	"testing"
+)
+
+func TestEmpty(t *testing.T) {
+}
diff --git a/src/cmd/go/testdata/script/test_no_run_example.txt b/src/cmd/go/testdata/script/test_no_run_example.txt
new file mode 100644
index 0000000..53ac755
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_no_run_example.txt
@@ -0,0 +1,30 @@
+go test -v norunexample
+stdout 'File with non-runnable example was built.'
+
+-- go.mod --
+module norunexample
+
+go 1.16
+-- example_test.go --
+package pkg_test
+
+import "os"
+
+func init() {
+	os.Stdout.Write([]byte("File with non-runnable example was built.\n"))
+}
+
+func Example_test() {
+	// This test will not be run, it has no "Output:" comment.
+}
+-- test_test.go --
+package pkg
+
+import (
+	"os"
+	"testing"
+)
+
+func TestBuilt(t *testing.T) {
+	os.Stdout.Write([]byte("A normal test was executed.\n"))
+}
diff --git a/src/cmd/go/testdata/script/test_no_tests.txt b/src/cmd/go/testdata/script/test_no_tests.txt
new file mode 100644
index 0000000..2d624d1
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_no_tests.txt
@@ -0,0 +1,15 @@
+# Tests issue #26242
+
+go test testnorun
+stdout 'testnorun\t\[no test files\]'
+
+-- go.mod --
+module testnorun
+
+go 1.16
+-- p.go --
+package p
+
+func init() {
+	panic("go test must not link and run test binaries without tests")
+}
diff --git a/src/cmd/go/testdata/script/test_parallel_number.txt b/src/cmd/go/testdata/script/test_parallel_number.txt
new file mode 100644
index 0000000..4eb9794
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_parallel_number.txt
@@ -0,0 +1,25 @@
+[short] skip
+
+# go test -parallel -1 shouldn't work
+! go test -parallel -1 standalone_parallel_sub_test.go
+stdout '-parallel can only be given'
+
+# go test -parallel 0 shouldn't work
+! go test -parallel 0 standalone_parallel_sub_test.go
+stdout '-parallel can only be given'
+
+-- standalone_parallel_sub_test.go --
+package standalone_parallel_sub_test
+
+import "testing"
+
+func Test(t *testing.T) {
+	ch := make(chan bool, 1)
+	t.Run("Sub", func(t *testing.T) {
+		t.Parallel()
+		<-ch
+		t.Run("Nested", func(t *testing.T) {})
+	})
+	// Ensures that Sub will finish after its t.Run call already returned.
+	ch <- true
+}
diff --git a/src/cmd/go/testdata/script/test_profile.txt b/src/cmd/go/testdata/script/test_profile.txt
new file mode 100644
index 0000000..4bfa2cc
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_profile.txt
@@ -0,0 +1,19 @@
+[gccgo] skip 'gccgo has no standard packages'
+[short] skip
+
+# Check go test -cpuprofile creates errors.test
+go test -cpuprofile errors.prof errors
+exists -exec errors.test$GOEXE
+
+# Check go test -cpuprofile -o myerrors.test creates errors.test
+go test -cpuprofile errors.prof -o myerrors.test$GOEXE errors
+exists -exec myerrors.test$GOEXE
+
+# Check go test -mutexprofile creates errors.test
+go test -mutexprofile errors.prof errors
+exists -exec errors.test$GOEXE
+
+# Check go test -mutexprofile -o myerrors.test creates errors.test
+go test -mutexprofile errors.prof -o myerrors.test$GOEXE errors
+exists -exec myerrors.test$GOEXE
+
diff --git a/src/cmd/go/testdata/script/test_race.txt b/src/cmd/go/testdata/script/test_race.txt
new file mode 100644
index 0000000..2ffea46
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_race.txt
@@ -0,0 +1,51 @@
+[short] skip
+[!race] skip
+
+go test testrace
+
+! go test -race testrace
+stdout 'FAIL: TestRace'
+! stdout 'PASS'
+! stderr 'PASS'
+
+! go test -race testrace -run XXX -bench .
+stdout 'FAIL: BenchmarkRace'
+! stdout 'PASS'
+! stderr 'PASS'
+
+-- go.mod --
+module testrace
+
+go 1.16
+-- race_test.go --
+package testrace
+
+import "testing"
+
+func TestRace(t *testing.T) {
+	for i := 0; i < 10; i++ {
+		c := make(chan int)
+		x := 1
+		go func() {
+			x = 2
+			c <- 1
+		}()
+		x = 3
+		<-c
+		_ = x
+	}
+}
+
+func BenchmarkRace(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		c := make(chan int)
+		x := 1
+		go func() {
+			x = 2
+			c <- 1
+		}()
+		x = 3
+		<-c
+		_ = x
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_race_cover_mode_issue20435.txt b/src/cmd/go/testdata/script/test_race_cover_mode_issue20435.txt
new file mode 100644
index 0000000..eacc882
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_race_cover_mode_issue20435.txt
@@ -0,0 +1,48 @@
+[short] skip
+[!race] skip
+
+# Make sure test is functional.
+go test testrace
+
+# Now, check that -race -covermode=set is not allowed.
+! go test -race -covermode=set testrace
+stderr '-covermode must be "atomic", not "set", when -race is enabled'
+! stdout PASS
+! stderr PASS
+
+-- go.mod --
+module testrace
+
+go 1.16
+-- race_test.go --
+package testrace
+
+import "testing"
+
+func TestRace(t *testing.T) {
+	for i := 0; i < 10; i++ {
+		c := make(chan int)
+		x := 1
+		go func() {
+			x = 2
+			c <- 1
+		}()
+		x = 3
+		<-c
+		_ = x
+	}
+}
+
+func BenchmarkRace(b *testing.B) {
+	for i := 0; i < b.N; i++ {
+		c := make(chan int)
+		x := 1
+		go func() {
+			x = 2
+			c <- 1
+		}()
+		x = 3
+		<-c
+		_ = x
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_race_install.txt b/src/cmd/go/testdata/script/test_race_install.txt
new file mode 100644
index 0000000..8b1f343
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_race_install.txt
@@ -0,0 +1,18 @@
+[!race] skip
+[short] skip
+
+mkdir $WORKDIR/tmp/pkg
+go install -race -pkgdir=$WORKDIR/tmp/pkg std
+
+# Make sure go test -i -race doesn't rebuild cached packages
+go test -race -pkgdir=$WORKDIR/tmp/pkg -i -v empty/pkg
+cmp stderr stderr.txt
+
+-- go.mod --
+module empty
+
+go 1.16
+-- pkg/pkg.go --
+package p
+-- stderr.txt --
+go test: -i flag is deprecated
diff --git a/src/cmd/go/testdata/script/test_race_install_cgo.txt b/src/cmd/go/testdata/script/test_race_install_cgo.txt
new file mode 100644
index 0000000..3f4eb90
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_race_install_cgo.txt
@@ -0,0 +1,93 @@
+# Tests Issue #10500
+
+[!race] skip
+
+[!darwin] ! stale cmd/cgo  # The darwin builders are spuriously stale; see #33598.
+
+env GOBIN=$WORK/bin
+go install m/mtime m/sametime
+
+go tool -n cgo
+cp stdout cgopath.txt
+exec $GOBIN/mtime cgopath.txt # get the mtime of the file whose name is in cgopath.txt
+cp stdout cgotime_before.txt
+
+ # For this test, we don't actually care whether 'go test -race -i' succeeds.
+ # It may fail if GOROOT is read-only (perhaps it was installed as root).
+ # We only care that it does not overwrite cmd/cgo regardless.
+? go test -race -i runtime/race
+
+exec $GOBIN/mtime cgopath.txt # get the mtime of the file whose name is in cgopath.txt
+cp stdout cgotime_after.txt
+exec $GOBIN/sametime cgotime_before.txt cgotime_after.txt
+
+-- go.mod --
+module m
+
+go 1.16
+-- mtime/mtime.go --
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"strings"
+)
+
+func main() {
+	b, err := os.ReadFile(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	filename := strings.TrimSpace(string(b))
+	info, err := os.Stat(filename)
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.NewEncoder(os.Stdout).Encode(info.ModTime()); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+-- sametime/sametime.go --
+package main
+
+import (
+	"encoding/json"
+	"fmt"
+	"os"
+	"time"
+)
+
+
+func main() {
+	var t1 time.Time
+	b1, err := os.ReadFile(os.Args[1])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.Unmarshal(b1, &t1); err != nil  {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	var t2 time.Time
+	b2, err := os.ReadFile(os.Args[2])
+	if err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+	if err := json.Unmarshal(b2, &t2); err != nil  {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+
+	if !t1.Equal(t2) {
+		fmt.Fprintf(os.Stderr, "time in %v (%v) is not the same as time in %v (%v)", os.Args[1], t1, os.Args[2], t2)
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_rebuildall.txt b/src/cmd/go/testdata/script/test_rebuildall.txt
new file mode 100644
index 0000000..38233c1
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_rebuildall.txt
@@ -0,0 +1,14 @@
+env GO111MODULE=off
+
+# Regression test for golang.org/issue/6844:
+# 'go test -a' should force dependencies in the standard library to be rebuilt.
+
+[short] skip
+
+go test -x -a -c testdata/dep_test.go
+stderr '^.*[/\\]compile'$GOEXE'["]? (.* )?regexp .*[/\\]regexp\.go'
+
+-- testdata/dep_test.go --
+package deps
+
+import _ "testing"
diff --git a/src/cmd/go/testdata/script/test_regexps.txt b/src/cmd/go/testdata/script/test_regexps.txt
new file mode 100644
index 0000000..2f33080
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_regexps.txt
@@ -0,0 +1,79 @@
+go test -cpu=1 -run=X/Y -bench=X/Y -count=2 -v testregexp
+
+# Test the following:
+
+# TestX is run, twice
+stdout -count=2 '^=== RUN   TestX$'
+stdout -count=2 '^    x_test.go:6: LOG: X running$'
+
+# TestX/Y is run, twice
+stdout -count=2 '^=== RUN   TestX/Y$'
+stdout -count=2 '^    x_test.go:8: LOG: Y running$'
+
+# TestXX is run, twice
+stdout -count=2 '^=== RUN   TestXX$'
+stdout -count=2 '^    z_test.go:10: LOG: XX running'
+
+# TestZ is not run
+! stdout '^=== RUN   TestZ$'
+
+# BenchmarkX is run with N=1 once, only to discover what sub-benchmarks it has,
+# and should not print a final summary line.
+stdout -count=1 '^    x_test.go:13: LOG: X running N=1$'
+! stdout '^\s+BenchmarkX: x_test.go:13: LOG: X running N=\d\d+'
+! stdout 'BenchmarkX\s+\d+'
+
+# Same for BenchmarkXX.
+stdout -count=1 '^    z_test.go:18: LOG: XX running N=1$'
+! stdout  '^    z_test.go:18: LOG: XX running N=\d\d+'
+! stdout 'BenchmarkXX\s+\d+'
+
+# BenchmarkX/Y is run in full twice due to -count=2.
+# "Run in full" means that it runs for approximately the default benchtime,
+# but may cap out at N=1e9.
+# We don't actually care what the final iteration count is, but it should be
+# a large number, and the last iteration count prints right before the results.
+stdout -count=2 '^    x_test.go:15: LOG: Y running N=[1-9]\d{4,}\nBenchmarkX/Y\s+\d+'
+
+-- go.mod --
+module testregexp
+
+go 1.16
+-- x_test.go --
+package x
+
+import "testing"
+
+func TestX(t *testing.T) {
+	t.Logf("LOG: X running")
+	t.Run("Y", func(t *testing.T) {
+		t.Logf("LOG: Y running")
+	})
+}
+
+func BenchmarkX(b *testing.B) {
+	b.Logf("LOG: X running N=%d", b.N)
+	b.Run("Y", func(b *testing.B) {
+		b.Logf("LOG: Y running N=%d", b.N)
+	})
+}
+-- z_test.go --
+package x
+
+import "testing"
+
+func TestZ(t *testing.T) {
+	t.Logf("LOG: Z running")
+}
+
+func TestXX(t *testing.T) {
+	t.Logf("LOG: XX running")
+}
+
+func BenchmarkZ(b *testing.B) {
+	b.Logf("LOG: Z running N=%d", b.N)
+}
+
+func BenchmarkXX(b *testing.B) {
+	b.Logf("LOG: XX running N=%d", b.N)
+}
diff --git a/src/cmd/go/testdata/script/test_relative_cmdline.txt b/src/cmd/go/testdata/script/test_relative_cmdline.txt
new file mode 100644
index 0000000..2f9c80f
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_relative_cmdline.txt
@@ -0,0 +1,50 @@
+# Relative imports in command line package
+
+# Run tests outside GOPATH.
+env GOPATH=$WORK/tmp
+
+go test ./testimport/p.go ./testimport/p_test.go ./testimport/x_test.go
+stdout '^ok'
+
+-- testimport/p.go --
+package p
+
+func F() int { return 1 }
+-- testimport/p1/p1.go --
+package p1
+
+func F() int { return 1 }
+-- testimport/p2/p2.go --
+package p2
+
+func F() int { return 1 }
+-- testimport/p_test.go --
+package p
+
+import (
+	"./p1"
+
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	if F() != p1.F() {
+		t.Fatal(F())
+	}
+}
+-- testimport/x_test.go --
+package p_test
+
+import (
+	. "../testimport"
+
+	"./p2"
+
+	"testing"
+)
+
+func TestF1(t *testing.T) {
+	if F() != p2.F() {
+		t.Fatal(F())
+	}
+}
\ No newline at end of file
diff --git a/src/cmd/go/testdata/script/test_relative_import.txt b/src/cmd/go/testdata/script/test_relative_import.txt
new file mode 100644
index 0000000..938a875
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_relative_import.txt
@@ -0,0 +1,31 @@
+# Relative imports in go test
+env GO111MODULE=off # relative import not supported in module mode
+
+# Run tests outside GOPATH.
+env GOPATH=$WORK/tmp
+
+go test ./testimport
+stdout '^ok'
+
+-- testimport/p.go --
+package p
+
+func F() int { return 1 }
+-- testimport/p1/p1.go --
+package p1
+
+func F() int { return 1 }
+-- testimport/p_test.go --
+package p
+
+import (
+	"./p1"
+
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	if F() != p1.F() {
+		t.Fatal(F())
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_relative_import_dash_i.txt b/src/cmd/go/testdata/script/test_relative_import_dash_i.txt
new file mode 100644
index 0000000..b2716d8
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_relative_import_dash_i.txt
@@ -0,0 +1,32 @@
+# Relative imports in go test -i
+env GO111MODULE=off # relative import not supported in module mode
+
+# Run tests outside GOPATH.
+env GOPATH=$WORK/tmp
+
+# Check that it's safe to pass -i (which installs dependencies in $GOPATH/pkg) to go test.
+! stale runtime # don't let test -i overwrite runtime
+go test -i ./testimport
+
+-- testimport/p.go --
+package p
+
+func F() int { return 1 }
+-- testimport/p1/p1.go --
+package p1
+
+func F() int { return 1 }
+-- testimport/p_test.go --
+package p
+
+import (
+	"./p1"
+
+	"testing"
+)
+
+func TestF(t *testing.T) {
+	if F() != p1.F() {
+		t.Fatal(F())
+	}
+}
diff --git a/src/cmd/go/testdata/script/test_source_order.txt b/src/cmd/go/testdata/script/test_source_order.txt
new file mode 100644
index 0000000..2865276
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_source_order.txt
@@ -0,0 +1,54 @@
+[short] skip
+
+# Control
+! go test example2_test.go example1_test.go
+
+# This test only passes if the source order is preserved
+go test example1_test.go example2_test.go
+
+-- example1_test.go --
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Make sure that go test runs Example_Z before Example_A, preserving source order.
+
+package p
+
+import "fmt"
+
+var n int
+
+func Example_Z() {
+	n++
+	fmt.Println(n)
+	// Output: 1
+}
+
+func Example_A() {
+	n++
+	fmt.Println(n)
+	// Output: 2
+}
+-- example2_test.go --
+// Copyright 2013 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// Make sure that go test runs Example_Y before Example_B, preserving source order.
+
+package p
+
+import "fmt"
+
+func Example_Y() {
+	n++
+	fmt.Println(n)
+	// Output: 3
+}
+
+func Example_B() {
+	n++
+	fmt.Println(n)
+	// Output: 4
+}
diff --git a/src/cmd/go/testdata/script/test_status.txt b/src/cmd/go/testdata/script/test_status.txt
new file mode 100644
index 0000000..aa6ad3c
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_status.txt
@@ -0,0 +1,18 @@
+env GO111MODULE=off
+
+! go test x y
+stdout ^FAIL\s+x
+stdout ^ok\s+y
+stdout (?-m)FAIL\n$
+
+-- x/x_test.go --
+package x
+
+import "testing"
+
+func TestNothingJustFail(t *testing.T) {
+    t.Fail()
+}
+
+-- y/y_test.go --
+package y
diff --git a/src/cmd/go/testdata/script/test_syntax_error_says_fail.txt b/src/cmd/go/testdata/script/test_syntax_error_says_fail.txt
new file mode 100644
index 0000000..44ff6e2
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_syntax_error_says_fail.txt
@@ -0,0 +1,25 @@
+# Test that the error message for a syntax error in a test go file
+# says FAIL.
+
+env GO111MODULE=off
+! go test syntaxerror
+stderr 'x_test.go:' # check that the error is diagnosed
+stdout 'FAIL' # check that go test says FAIL
+
+env GO111MODULE=on
+cd syntaxerror
+! go test syntaxerror
+stderr 'x_test.go:' # check that the error is diagnosed
+stdout 'FAIL' # check that go test says FAIL
+
+-- syntaxerror/go.mod --
+module syntaxerror
+
+go 1.16
+-- syntaxerror/x.go --
+package p
+-- syntaxerror/x_test.go --
+package p
+
+func f() (x.y, z int) {
+}
diff --git a/src/cmd/go/testdata/script/test_timeout.txt b/src/cmd/go/testdata/script/test_timeout.txt
new file mode 100644
index 0000000..4de4df4
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_timeout.txt
@@ -0,0 +1,23 @@
+[short] skip
+env GO111MODULE=off
+cd a
+
+# If no timeout is set explicitly, 'go test' should set
+# -test.timeout to its internal deadline.
+go test -v . --
+stdout '10m0s'
+
+# An explicit -timeout argument should be propagated to -test.timeout.
+go test -v -timeout 30m . --
+stdout '30m0s'
+
+-- a/timeout_test.go --
+package t
+import (
+	"flag"
+	"fmt"
+	"testing"
+)
+func TestTimeout(t *testing.T) {
+	fmt.Println(flag.Lookup("test.timeout").Value.String())
+}
diff --git a/src/cmd/go/testdata/script/test_vendor.txt b/src/cmd/go/testdata/script/test_vendor.txt
new file mode 100644
index 0000000..c6a88b6
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_vendor.txt
@@ -0,0 +1,57 @@
+# In GOPATH mode, vendored packages can replace std packages.
+env GO111MODULE=off
+cd vend/hello
+go test -v
+stdout TestMsgInternal
+stdout TestMsgExternal
+
+# In module mode, they cannot.
+env GO111MODULE=on
+! go test -mod=vendor
+stderr 'undefined: strings.Msg'
+
+-- vend/hello/go.mod --
+module vend/hello
+
+go 1.16
+-- vend/hello/hello.go --
+package main
+
+import (
+	"fmt"
+	"strings" // really ../vendor/strings
+)
+
+func main() {
+	fmt.Printf("%s\n", strings.Msg)
+}
+-- vend/hello/hello_test.go --
+package main
+
+import (
+	"strings" // really ../vendor/strings
+	"testing"
+)
+
+func TestMsgInternal(t *testing.T) {
+	if strings.Msg != "hello, world" {
+		t.Fatalf("unexpected msg: %v", strings.Msg)
+	}
+}
+-- vend/hello/hellox_test.go --
+package main_test
+
+import (
+	"strings" // really ../vendor/strings
+	"testing"
+)
+
+func TestMsgExternal(t *testing.T) {
+	if strings.Msg != "hello, world" {
+		t.Fatalf("unexpected msg: %v", strings.Msg)
+	}
+}
+-- vend/vendor/strings/msg.go --
+package strings
+
+var Msg = "hello, world"
diff --git a/src/cmd/go/testdata/script/test_vet.txt b/src/cmd/go/testdata/script/test_vet.txt
new file mode 100644
index 0000000..5af26b5
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_vet.txt
@@ -0,0 +1,92 @@
+[short] skip
+
+# Test file
+! go test p1_test.go
+stderr 'Logf format %d'
+go test -vet=off
+stdout '^ok'
+
+# Non-test file
+! go test p1.go
+stderr 'Printf format %d'
+go test -x -vet=shift p1.go
+stderr '[\\/]vet.*-shift'
+stdout '\[no test files\]'
+go test -vet=off p1.go
+! stderr '[\\/]vet.*-shift'
+stdout '\[no test files\]'
+
+# Test issue #22890
+go test m/vetcycle
+stdout 'm/vetcycle.*\[no test files\]'
+
+# Test with ...
+! go test ./vetfail/...
+stderr 'Printf format %d'
+stdout 'ok\s+m/vetfail/p2'
+
+# Check there's no diagnosis of a bad build constraint in vetxonly mode.
+# Use -a so that we need to recompute the vet-specific export data for
+# vetfail/p1.
+go test -a m/vetfail/p2
+! stderr 'invalid.*constraint'
+
+-- go.mod --
+module m
+
+go 1.16
+-- p1_test.go --
+package p
+
+import "testing"
+
+func Test(t *testing.T) {
+	t.Logf("%d") // oops
+}
+-- p1.go --
+package p
+
+import "fmt"
+
+func F() {
+	fmt.Printf("%d") // oops
+}
+-- vetcycle/p.go --
+package p
+
+type (
+	_  interface{ m(B1) }
+	A1 interface{ a(D1) }
+	B1 interface{ A1 }
+	C1 interface {
+		B1 /* ERROR issue #18395 */
+	}
+	D1 interface{ C1 }
+)
+
+var _ A1 = C1 /* ERROR cannot use C1 */ (nil)
+-- vetfail/p1/p1.go --
+// +build !foo-bar
+
+package p1
+
+import "fmt"
+
+func F() {
+	fmt.Printf("%d", "hello") // causes vet error
+}
+-- vetfail/p2/p2.go --
+package p2
+
+import _ "m/vetfail/p1"
+
+func F() {
+}
+-- vetfail/p2/p2_test.go --
+package p2
+
+import "testing"
+
+func TestF(t *testing.T) {
+	F()
+}
diff --git a/src/cmd/go/testdata/script/test_write_profiles_on_timeout.txt b/src/cmd/go/testdata/script/test_write_profiles_on_timeout.txt
new file mode 100644
index 0000000..08e67a4
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_write_profiles_on_timeout.txt
@@ -0,0 +1,17 @@
+# Tests issue 19394
+
+[short] skip
+
+! go test -cpuprofile cpu.pprof -memprofile mem.pprof -timeout 1ms
+grep . cpu.pprof
+grep . mem.pprof
+
+-- go.mod --
+module profiling
+
+go 1.16
+-- timeout_test.go --
+package timeouttest_test
+import "testing"
+import "time"
+func TestSleep(t *testing.T) { time.Sleep(time.Second) }
diff --git a/src/cmd/go/testdata/script/test_xtestonly_works.txt b/src/cmd/go/testdata/script/test_xtestonly_works.txt
new file mode 100644
index 0000000..8e150db
--- /dev/null
+++ b/src/cmd/go/testdata/script/test_xtestonly_works.txt
@@ -0,0 +1,27 @@
+[short] skip
+
+go test xtestonly
+! stdout '^ok.*\[no tests to run\]'
+stdout '^ok'
+
+-- go.mod --
+module xtestonly
+
+go 1.16
+-- f.go --
+package xtestonly
+
+func F() int { return 42 }
+-- f_test.go --
+package xtestonly_test
+
+import (
+	"testing"
+	"xtestonly"
+)
+
+func TestF(t *testing.T) {
+	if x := xtestonly.F(); x != 42 {
+		t.Errorf("f.F() = %d, want 42", x)
+	}
+}
diff --git a/src/cmd/go/testdata/script/testing_issue40908.txt b/src/cmd/go/testdata/script/testing_issue40908.txt
new file mode 100644
index 0000000..839320e
--- /dev/null
+++ b/src/cmd/go/testdata/script/testing_issue40908.txt
@@ -0,0 +1,25 @@
+[short] skip
+[!race] skip
+
+go test -race testrace
+
+-- go.mod --
+module testrace
+
+go 1.16
+-- race_test.go --
+package testrace
+
+import "testing"
+
+func TestRace(t *testing.T) {
+	helperDone := make(chan struct{})
+	go func() {
+		t.Logf("Something happened before cleanup.")
+		close(helperDone)
+	}()
+
+	t.Cleanup(func() {
+		<-helperDone
+	})
+}
diff --git a/src/cmd/go/testdata/script/toolexec.txt b/src/cmd/go/testdata/script/toolexec.txt
new file mode 100644
index 0000000..5262341
--- /dev/null
+++ b/src/cmd/go/testdata/script/toolexec.txt
@@ -0,0 +1,85 @@
+[short] skip
+
+# Build our simple toolexec program.
+go build ./cmd/mytool
+
+# Build the main package with our toolexec program. For each action, it will
+# print the tool's name and the TOOLEXEC_IMPORTPATH value. We expect to compile
+# each package once, and link the main package once.
+# Don't check the entire output at once, because the order in which the tools
+# are run is irrelevant here.
+# Finally, note that asm and cgo are run twice.
+
+go build -toolexec=$PWD/mytool
+[amd64] stderr -count=2 '^asm'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main/withasm$'
+stderr -count=1 '^compile'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main/withasm$'
+[cgo] stderr -count=2 '^cgo'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main/withcgo$'
+[cgo] stderr -count=1 '^compile'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main/withcgo$'
+stderr -count=1 '^compile'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main$'
+stderr -count=1 '^link'${GOEXE}' TOOLEXEC_IMPORTPATH=test/main$'
+
+-- go.mod --
+module test/main
+-- foo.go --
+// Simple package so we can test a program build with -toolexec.
+// With a dummy import, to test different TOOLEXEC_IMPORTPATH values.
+// Includes dummy uses of cgo and asm, to cover those tools as well.
+package main
+
+import (
+	_ "test/main/withasm"
+	_ "test/main/withcgo"
+)
+
+func main() {}
+-- withcgo/withcgo.go --
+package withcgo
+
+// int fortytwo()
+// {
+//     return 42;
+// }
+import "C"
+-- withcgo/stub.go --
+package withcgo
+
+// Stub file to ensure we build without cgo too.
+-- withasm/withasm.go --
+package withasm
+
+// Note that we don't need to declare the Add func at all.
+-- withasm/withasm_amd64.s --
+TEXT ·Add(SB),$0-24
+	MOVQ a+0(FP), AX
+	ADDQ b+8(FP), AX
+	MOVQ AX, ret+16(FP)
+	RET
+-- cmd/mytool/main.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+)
+
+func main() {
+	tool, args := os.Args[1], os.Args[2:]
+	toolName := filepath.Base(tool)
+	if len(args) > 0 && args[0] == "-V=full" {
+		// We can't alter the version output.
+	} else {
+		// Print which tool we're running, and on what package.
+		fmt.Fprintf(os.Stdout, "%s TOOLEXEC_IMPORTPATH=%s\n", toolName, os.Getenv("TOOLEXEC_IMPORTPATH"))
+	}
+
+	// Simply run the tool.
+	cmd := exec.Command(tool, args...)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
diff --git a/src/cmd/go/testdata/script/vendor_complex.txt b/src/cmd/go/testdata/script/vendor_complex.txt
new file mode 100644
index 0000000..9ca94e7
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_complex.txt
@@ -0,0 +1,75 @@
+env GO111MODULE=off
+
+# smoke test for complex build configuration
+go build -o complex.exe complex
+[exec:gccgo] go build -compiler=gccgo -o complex.exe complex
+
+-- complex/main.go --
+package main
+
+import (
+	_ "complex/nest/sub/test12"
+	_ "complex/nest/sub/test23"
+	"complex/w"
+	"v"
+)
+
+func main() {
+	println(v.Hello + " " + w.World)
+}
+
+-- complex/nest/sub/test12/p.go --
+package test12
+
+// Check that vendor/v1 is used but vendor/v2 is NOT used (sub/vendor/v2 wins).
+
+import (
+	"v1"
+	"v2"
+)
+
+const x = v1.ComplexNestVendorV1
+const y = v2.ComplexNestSubVendorV2
+
+-- complex/nest/sub/test23/p.go --
+package test23
+
+// Check that vendor/v3 is used but vendor/v2 is NOT used (sub/vendor/v2 wins).
+
+import (
+	"v2"
+	"v3"
+)
+
+const x = v3.ComplexNestVendorV3
+const y = v2.ComplexNestSubVendorV2
+
+-- complex/nest/sub/vendor/v2/v2.go --
+package v2
+
+const ComplexNestSubVendorV2 = true
+
+-- complex/nest/vendor/v1/v1.go --
+package v1
+
+const ComplexNestVendorV1 = true
+
+-- complex/nest/vendor/v2/v2.go --
+package v2
+
+const ComplexNestVendorV2 = true
+
+-- complex/nest/vendor/v3/v3.go --
+package v3
+
+const ComplexNestVendorV3 = true
+
+-- complex/vendor/v/v.go --
+package v
+
+const Hello = "hello"
+
+-- complex/w/w.go --
+package w
+
+const World = "world"
diff --git a/src/cmd/go/testdata/script/vendor_gopath_issue11409.txt b/src/cmd/go/testdata/script/vendor_gopath_issue11409.txt
new file mode 100644
index 0000000..da52f9a
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_gopath_issue11409.txt
@@ -0,0 +1,52 @@
+[!windows] [short] stop 'this test only applies to Windows'
+env GO111MODULE=off
+
+go build run_go.go
+exec ./run_go$GOEXE $GOPATH $GOPATH/src/vend/hello
+stdout 'hello, world'
+
+-- run_go.go --
+package main
+
+import (
+	"fmt"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"strings"
+)
+
+func changeVolume(s string, f func(s string) string) string {
+	vol := filepath.VolumeName(s)
+	return f(vol) + s[len(vol):]
+}
+
+func main() {
+	gopath := changeVolume(os.Args[1], strings.ToLower)
+	dir := changeVolume(os.Args[2], strings.ToUpper)
+	cmd := exec.Command("go", "run", "hello.go")
+	cmd.Dir = dir
+	cmd.Env = append(os.Environ(), "GOPATH="+gopath)
+	cmd.Stdout = os.Stdout
+	cmd.Stderr = os.Stderr
+	if err := cmd.Run(); err != nil {
+		fmt.Fprintln(os.Stderr, err)
+		os.Exit(1)
+	}
+}
+
+-- vend/hello/hello.go --
+package main
+
+import (
+	"fmt"
+	"strings" // really ../vendor/strings
+)
+
+func main() {
+	fmt.Printf("%s\n", strings.Msg)
+}
+-- vend/vendor/strings/msg.go --
+package strings
+
+var Msg = "hello, world"
diff --git a/src/cmd/go/testdata/script/vendor_import.txt b/src/cmd/go/testdata/script/vendor_import.txt
new file mode 100644
index 0000000..df4c27d
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_import.txt
@@ -0,0 +1,104 @@
+# Imports
+env GO111MODULE=off
+go list -f  '{{.ImportPath}} {{.Imports}}' 'vend/...' 'vend/vendor/...' 'vend/x/vendor/...'
+cmp stdout want_vendor_imports.txt
+
+-- want_vendor_imports.txt --
+vend [vend/vendor/p r]
+vend/dir1 []
+vend/hello [fmt vend/vendor/strings]
+vend/subdir [vend/vendor/p r]
+vend/x [vend/x/vendor/p vend/vendor/q vend/x/vendor/r vend/dir1 vend/vendor/vend/dir1/dir2]
+vend/x/invalid [vend/x/invalid/vendor/foo]
+vend/vendor/p []
+vend/vendor/q []
+vend/vendor/strings []
+vend/vendor/vend/dir1/dir2 []
+vend/x/vendor/p []
+vend/x/vendor/p/p [notfound]
+vend/x/vendor/r []
+-- vend/bad.go --
+package vend
+
+import _ "r"
+-- vend/dir1/dir1.go --
+package dir1
+-- vend/good.go --
+package vend
+
+import _ "p"
+-- vend/hello/hello.go --
+package main
+
+import (
+	"fmt"
+	"strings" // really ../vendor/strings
+)
+
+func main() {
+	fmt.Printf("%s\n", strings.Msg)
+}
+-- vend/hello/hello_test.go --
+package main
+
+import (
+	"strings" // really ../vendor/strings
+	"testing"
+)
+
+func TestMsgInternal(t *testing.T) {
+	if strings.Msg != "hello, world" {
+		t.Fatalf("unexpected msg: %v", strings.Msg)
+	}
+}
+-- vend/hello/hellox_test.go --
+package main_test
+
+import (
+	"strings" // really ../vendor/strings
+	"testing"
+)
+
+func TestMsgExternal(t *testing.T) {
+	if strings.Msg != "hello, world" {
+		t.Fatalf("unexpected msg: %v", strings.Msg)
+	}
+}
+-- vend/subdir/bad.go --
+package subdir
+
+import _ "r"
+-- vend/subdir/good.go --
+package subdir
+
+import _ "p"
+-- vend/vendor/p/p.go --
+package p
+-- vend/vendor/q/q.go --
+package q
+-- vend/vendor/strings/msg.go --
+package strings
+
+var Msg = "hello, world"
+-- vend/vendor/vend/dir1/dir2/dir2.go --
+package dir2
+-- vend/x/invalid/invalid.go --
+package invalid
+
+import "vend/x/invalid/vendor/foo"
+-- vend/x/vendor/p/p/p.go --
+package p
+
+import _ "notfound"
+-- vend/x/vendor/p/p.go --
+package p
+-- vend/x/vendor/r/r.go --
+package r
+-- vend/x/x.go --
+package x
+
+import _ "p"
+import _ "q"
+import _ "r"
+import _ "vend/dir1"      // not vendored
+import _ "vend/dir1/dir2" // vendored
diff --git a/src/cmd/go/testdata/script/vendor_import_missing.txt b/src/cmd/go/testdata/script/vendor_import_missing.txt
new file mode 100644
index 0000000..8e50dfe
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_import_missing.txt
@@ -0,0 +1,7 @@
+# Missing package error message
+! go build vend/x/vendor/p/p
+
+-- vend/x/vendor/p/p/p.go --
+package p
+
+import _ "notfound"
diff --git a/src/cmd/go/testdata/script/vendor_import_wrong.txt b/src/cmd/go/testdata/script/vendor_import_wrong.txt
new file mode 100644
index 0000000..73bf595
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_import_wrong.txt
@@ -0,0 +1,20 @@
+# Wrong import path
+env GO111MODULE=off
+! go build vend/x/invalid
+stderr 'must be imported as foo'
+
+env GO111MODULE=
+cd vend/x/invalid
+! go build vend/x/invalid
+stderr 'must be imported as foo'
+
+-- vend/x/invalid/go.mod --
+module vend/x/invalid
+
+go 1.16
+
+-- vend/x/invalid/invalid.go --
+package invalid
+
+import "vend/x/invalid/vendor/foo"
+
diff --git a/src/cmd/go/testdata/script/vendor_issue12156.txt b/src/cmd/go/testdata/script/vendor_issue12156.txt
new file mode 100644
index 0000000..ac95c6d
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_issue12156.txt
@@ -0,0 +1,16 @@
+# Tests issue #12156, a former index out of range panic.
+
+env GO111MODULE=off
+env GOPATH=$WORK/gopath/src/testvendor2 # vendor/x is directly in $GOPATH, not in $GOPATH/src
+cd $WORK/gopath/src/testvendor2/src/p
+
+! go build p.go
+! stderr panic # Make sure it doesn't panic
+stderr 'cannot find package "x"'
+
+-- testvendor2/src/p/p.go --
+package p
+
+import "x"
+-- testvendor2/vendor/x/x.go --
+package x
diff --git a/src/cmd/go/testdata/script/vendor_list_issue11977.txt b/src/cmd/go/testdata/script/vendor_list_issue11977.txt
new file mode 100644
index 0000000..ce2e29f
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_list_issue11977.txt
@@ -0,0 +1,17 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get -d github.com/rsc/go-get-issue-11864
+
+go list -f '{{join .TestImports "\n"}}' github.com/rsc/go-get-issue-11864/t
+stdout 'go-get-issue-11864/vendor/vendor.org/p'
+
+go list -f '{{join .XTestImports "\n"}}' github.com/rsc/go-get-issue-11864/tx
+stdout 'go-get-issue-11864/vendor/vendor.org/p'
+
+go list -f '{{join .XTestImports "\n"}}' github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2
+stdout 'go-get-issue-11864/vendor/vendor.org/tx2'
+
+go list -f '{{join .XTestImports "\n"}}' github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx3
+stdout 'go-get-issue-11864/vendor/vendor.org/tx3'
diff --git a/src/cmd/go/testdata/script/vendor_resolve.txt b/src/cmd/go/testdata/script/vendor_resolve.txt
new file mode 100644
index 0000000..bc8cf0a
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_resolve.txt
@@ -0,0 +1,21 @@
+env GO111MODULE=off
+! go build p
+stderr 'must be imported as x'
+
+-- p/p.go --
+package p
+
+import (
+	_ "q/y"
+	_ "q/z"
+)
+-- q/vendor/x/x.go --
+package x
+-- q/y/y.go --
+package y
+
+import _ "x"
+-- q/z/z.go --
+package z
+
+import _ "q/vendor/x"
diff --git a/src/cmd/go/testdata/script/vendor_test_issue11864.txt b/src/cmd/go/testdata/script/vendor_test_issue11864.txt
new file mode 100644
index 0000000..cfb43bf
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_test_issue11864.txt
@@ -0,0 +1,20 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+go get github.com/rsc/go-get-issue-11864
+
+# build -i should work
+go build -i github.com/rsc/go-get-issue-11864
+go build -i github.com/rsc/go-get-issue-11864/t
+
+# test -i should work like build -i (golang.org/issue/11988)
+go test -i github.com/rsc/go-get-issue-11864
+go test -i github.com/rsc/go-get-issue-11864/t
+
+# test should work too
+go test github.com/rsc/go-get-issue-11864
+go test github.com/rsc/go-get-issue-11864/t
+
+# external tests should observe internal test exports (golang.org/issue/11977)
+go test github.com/rsc/go-get-issue-11864/vendor/vendor.org/tx2
diff --git a/src/cmd/go/testdata/script/vendor_test_issue14613.txt b/src/cmd/go/testdata/script/vendor_test_issue14613.txt
new file mode 100644
index 0000000..7801e69
--- /dev/null
+++ b/src/cmd/go/testdata/script/vendor_test_issue14613.txt
@@ -0,0 +1,22 @@
+[!net] skip
+[!exec:git] skip
+env GO111MODULE=off
+
+cd $GOPATH
+
+go get github.com/clsung/go-vendor-issue-14613
+go build -o $WORK/a.out -i github.com/clsung/go-vendor-issue-14613
+
+# test folder should work
+go test -i github.com/clsung/go-vendor-issue-14613
+go test github.com/clsung/go-vendor-issue-14613
+
+# test with specified _test.go should work too
+cd $GOPATH/src
+go test -i github.com/clsung/go-vendor-issue-14613/vendor_test.go
+go test github.com/clsung/go-vendor-issue-14613/vendor_test.go
+
+# test with imported and not used
+go test -i github.com/clsung/go-vendor-issue-14613/vendor/mylibtesttest/myapp/myapp_test.go
+! go test github.com/clsung/go-vendor-issue-14613/vendor/mylibtesttest/myapp/myapp_test.go
+stderr 'imported and not used:'
diff --git a/src/cmd/go/testdata/script/version.txt b/src/cmd/go/testdata/script/version.txt
new file mode 100644
index 0000000..8615a4a
--- /dev/null
+++ b/src/cmd/go/testdata/script/version.txt
@@ -0,0 +1,52 @@
+# Without arguments, we just print Go's own version.
+go version
+stdout '^go version'
+
+# Flags without files, or paths to misisng files, should error.
+! go version missing.exe
+! go version -m
+stderr 'with arguments'
+! go version -v
+stderr 'with arguments'
+
+# Neither of the two flags above should be an issue via GOFLAGS.
+env GOFLAGS='-m -v'
+go version
+stdout '^go version'
+env GOFLAGS=
+
+env GO111MODULE=on
+# Skip the builds below if we are running in short mode.
+[short] skip
+
+# Check that 'go version' and 'go version -m' work on a binary built in module mode.
+go get -d rsc.io/fortune
+go build -o fortune.exe rsc.io/fortune
+go version fortune.exe
+stdout '^fortune.exe: .+'
+go version -m fortune.exe
+stdout '^\tpath\trsc.io/fortune'
+stdout '^\tmod\trsc.io/fortune\tv1.0.0'
+
+# Repeat the test with -buildmode=pie.
+[!buildmode:pie] stop
+go build -buildmode=pie -o external.exe rsc.io/fortune
+go version external.exe
+stdout '^external.exe: .+'
+go version -m external.exe
+stdout '^\tpath\trsc.io/fortune'
+stdout '^\tmod\trsc.io/fortune\tv1.0.0'
+
+# Also test PIE with internal linking.
+# currently only supported on linux/amd64, linux/arm64 and windows/amd64.
+[!linux] [!windows] stop
+[!amd64] [!arm64] stop
+go build -buildmode=pie -ldflags=-linkmode=internal -o internal.exe rsc.io/fortune
+go version internal.exe
+stdout '^internal.exe: .+'
+go version -m internal.exe
+stdout '^\tpath\trsc.io/fortune'
+stdout '^\tmod\trsc.io/fortune\tv1.0.0'
+
+-- go.mod --
+module m
diff --git a/src/cmd/go/testdata/script/version_replace.txt b/src/cmd/go/testdata/script/version_replace.txt
new file mode 100644
index 0000000..ec98f4e
--- /dev/null
+++ b/src/cmd/go/testdata/script/version_replace.txt
@@ -0,0 +1,33 @@
+[short] skip
+
+go mod download example.com/printversion@v0.1.0 example.com/printversion@v1.0.0
+go get -d example.com/printversion@v0.1.0
+go install example.com/printversion
+
+go run example.com/printversion
+cmp stdout out.txt
+
+go version -m $GOPATH/bin/printversion$GOEXE
+stdout '^.*[/\\]bin[/\\]printversion'$GOEXE': .*$'
+stdout '^	path	example.com/printversion$'
+stdout '^	mod	example.com/printversion	v0.1.0$'
+stdout '^	=>	example.com/printversion	v1.0.0	h1:.*$'
+stdout '^	dep	example.com/version	v1.0.0$'
+stdout '^	=>	example.com/version	v1.0.1	h1:.*$'
+
+-- go.mod --
+module golang.org/issue/37392
+go 1.14
+require (
+	example.com/printversion v0.1.0
+)
+replace (
+	example.com/printversion => example.com/printversion v1.0.0
+	example.com/version v1.0.0 => example.com/version v1.0.1
+)
+-- out.txt --
+path is example.com/printversion
+main is example.com/printversion v0.1.0
+	(replaced by example.com/printversion v1.0.0)
+using example.com/version v1.0.0
+	(replaced by example.com/version v1.0.1)
diff --git a/src/cmd/go/testdata/script/vet.txt b/src/cmd/go/testdata/script/vet.txt
new file mode 100644
index 0000000..6573ae3
--- /dev/null
+++ b/src/cmd/go/testdata/script/vet.txt
@@ -0,0 +1,62 @@
+# Package with external tests
+! go vet m/vetpkg
+stderr 'Printf'
+
+# With tags
+! go vet -tags tagtest m/vetpkg
+stderr 'c\.go.*Printf'
+
+# With flags on
+! go vet -printf m/vetpkg
+stderr 'Printf'
+
+# With flags off
+go vet -printf=false m/vetpkg
+! stderr .
+
+# With only test files (tests issue #23395)
+go vet m/onlytest
+! stderr .
+
+# With only cgo files (tests issue #24193)
+[!cgo] skip
+[short] skip
+go vet m/onlycgo
+! stderr .
+
+-- go.mod --
+module m
+
+go 1.16
+-- vetpkg/a_test.go --
+package p_test
+-- vetpkg/b.go --
+package p
+
+import "fmt"
+
+func f() {
+	fmt.Printf("%d")
+}
+-- vetpkg/c.go --
+// +build tagtest
+
+package p
+
+import "fmt"
+
+func g() {
+	fmt.Printf("%d", 3, 4)
+}
+-- onlytest/p_test.go --
+package p
+
+import "testing"
+
+func TestMe(*testing.T) {}
+-- onlycgo/p.go --
+package p
+
+import "C"
+
+func F() {}
diff --git a/src/cmd/go/testdata/script/vet_asm.txt b/src/cmd/go/testdata/script/vet_asm.txt
new file mode 100644
index 0000000..59b35ec
--- /dev/null
+++ b/src/cmd/go/testdata/script/vet_asm.txt
@@ -0,0 +1,32 @@
+env GO111MODULE=off
+
+# Issue 27665. Verify that "go vet" analyzes non-Go files.
+
+[!amd64] skip
+! go vet -asmdecl a
+stderr 'f: invalid MOVW of x'
+
+# -c flag shows context
+! go vet -c=2 -asmdecl a
+stderr '...invalid MOVW...'
+stderr '1	.*TEXT'
+stderr '2		MOVW'
+stderr '3		RET'
+stderr '4'
+
+# -json causes success, even with diagnostics and errors.
+go vet -json -asmdecl a
+stderr '"a": {'
+stderr   '"asmdecl":'
+stderr     '"posn": ".*asm.s:2:1",'
+stderr     '"message": ".*invalid MOVW.*"'
+
+-- a/a.go --
+package a
+
+func f(x int8)
+
+-- a/asm.s --
+TEXT ·f(SB),0,$0-1
+	MOVW	x+0(FP), AX
+	RET
diff --git a/src/cmd/go/testdata/script/vet_deps.txt b/src/cmd/go/testdata/script/vet_deps.txt
new file mode 100644
index 0000000..b2a8f16
--- /dev/null
+++ b/src/cmd/go/testdata/script/vet_deps.txt
@@ -0,0 +1,34 @@
+env GO111MODULE=off
+
+# Issue 30296. Verify that "go vet" uses only immediate dependencies.
+
+# First run fills the cache.
+go vet a
+
+go vet -x a
+! stderr 'transitive'
+
+-- a/a.go --
+package a
+
+import "b"
+
+func F() {
+	b.F()
+}
+
+-- b/b.go --
+package b
+
+import "transitive"
+
+func F() {
+	transitive.F()
+}
+
+-- transitive/c.go --
+package transitive
+
+func F() {
+}
+
diff --git a/src/cmd/go/testdata/script/vet_flags.txt b/src/cmd/go/testdata/script/vet_flags.txt
new file mode 100644
index 0000000..e2e3f5b
--- /dev/null
+++ b/src/cmd/go/testdata/script/vet_flags.txt
@@ -0,0 +1,93 @@
+env GO111MODULE=on
+
+# Issue 35837: "go vet -<analyzer> <std package>" should use the requested
+# analyzers, not the default analyzers for 'go test'.
+go vet -n -buildtags=false runtime
+stderr '-buildtags=false'
+! stderr '-unsafeptr=false'
+
+# Issue 37030: "go vet <std package>" without other flags should disable the
+# unsafeptr check by default.
+go vet -n runtime
+stderr '-unsafeptr=false'
+! stderr '-unreachable=false'
+
+# However, it should be enabled if requested explicitly.
+go vet -n -unsafeptr runtime
+stderr '-unsafeptr'
+! stderr '-unsafeptr=false'
+
+# -unreachable is disabled during test but on during plain vet.
+go test -n runtime
+stderr '-unreachable=false'
+
+# A flag terminator should be allowed before the package list.
+go vet -n -- .
+
+[short] stop
+
+# Analyzer flags should be included from GOFLAGS, and should override
+# the defaults.
+go vet .
+env GOFLAGS='-tags=buggy'
+! go vet .
+stderr 'possible formatting directive'
+
+# Enabling one analyzer in GOFLAGS should disable the rest implicitly...
+env GOFLAGS='-tags=buggy -unsafeptr'
+go vet .
+
+# ...but enabling one on the command line should not disable the analyzers
+# enabled via GOFLAGS.
+env GOFLAGS='-tags=buggy -printf'
+! go vet -unsafeptr
+stderr 'possible formatting directive'
+
+# Analyzer flags don't exist unless we're running 'go vet',
+# and we shouldn't run the vet tool to discover them otherwise.
+# (Maybe someday we'll hard-code the analyzer flags for the default vet
+# tool to make this work, but not right now.)
+env GOFLAGS='-unsafeptr'
+! go list .
+stderr 'go: parsing \$GOFLAGS: unknown flag -unsafeptr'
+env GOFLAGS=
+
+env GOCACHE=$WORK/gocache
+
+# "go test" on a user package should by default enable an explicit list of analyzers.
+go test -x -run=none .
+stderr '[/\\]vet'$GOEXE'["]? .* -errorsas .* ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+
+# An explicitly-empty -vet argument should imply the default analyzers.
+go test -x -vet= -run=none .
+stderr '[/\\]vet'$GOEXE'["]? .* -errorsas .* ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+
+# "go test" on a standard package should by default disable an explicit list.
+go test -x -run=none encoding/binary
+stderr '[/\\]vet'$GOEXE'["]? -unsafeptr=false -unreachable=false ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+
+go test -x -vet= -run=none encoding/binary
+stderr '[/\\]vet'$GOEXE'["]? -unsafeptr=false -unreachable=false ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+
+# Both should allow users to override via the -vet flag.
+go test -x -vet=unreachable -run=none .
+stderr '[/\\]vet'$GOEXE'["]? -unreachable ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+go test -x -vet=unreachable -run=none encoding/binary
+stderr '[/\\]vet'$GOEXE'["]? -unreachable ["]?\$WORK[/\\][^ ]*[/\\]vet\.cfg'
+
+-- go.mod --
+module example.com/x
+-- x.go --
+package x
+-- x_test.go --
+package x
+-- x_tagged.go --
+// +build buggy
+
+package x
+
+import "fmt"
+
+func init() {
+	fmt.Sprint("%s") // oops!
+}
diff --git a/src/cmd/go/testdata/script/vet_internal.txt b/src/cmd/go/testdata/script/vet_internal.txt
new file mode 100644
index 0000000..85f7093
--- /dev/null
+++ b/src/cmd/go/testdata/script/vet_internal.txt
@@ -0,0 +1,71 @@
+env GO111MODULE=off
+
+# Issue 36173. Verify that "go vet" prints line numbers on load errors.
+
+! go vet a/a.go
+stderr '^package command-line-arguments\n\ta[/\\]a.go:5:3: use of internal package'
+
+! go vet a/a_test.go
+stderr '^package command-line-arguments \(test\)\n\ta[/\\]a_test.go:4:3: use of internal package'
+
+! go vet a
+stderr '^package a\n\ta[/\\]a.go:5:3: use of internal package'
+
+go vet b/b.go
+! stderr 'use of internal package'
+
+! go vet b/b_test.go
+stderr '^package command-line-arguments \(test\)\n\tb[/\\]b_test.go:4:3: use of internal package'
+
+! go vet depends-on-a/depends-on-a.go
+stderr '^package command-line-arguments\n\timports a\n\ta[/\\]a.go:5:3: use of internal package'
+
+! go vet depends-on-a/depends-on-a_test.go
+stderr '^package command-line-arguments \(test\)\n\timports a\n\ta[/\\]a.go:5:3: use of internal package a/x/internal/y not allowed'
+
+! go vet depends-on-a
+stderr '^package depends-on-a\n\timports a\n\ta[/\\]a.go:5:3: use of internal package'
+
+-- a/a.go --
+// A package with bad imports in both src and test
+package a
+
+import (
+  _ "a/x/internal/y"
+)
+
+-- a/a_test.go --
+package a
+
+import (
+  _ "a/x/internal/y"
+)
+
+-- b/b.go --
+// A package with a bad import in test only
+package b
+
+-- b/b_test.go --
+package b
+
+import (
+  _ "a/x/internal/y"
+)
+
+-- depends-on-a/depends-on-a.go --
+// A package that depends on a package with a bad import
+package depends
+
+import (
+  _ "a"
+)
+
+-- depends-on-a/depends-on-a_test.go --
+package depends
+
+import (
+  _ "a"
+)
+
+-- a/x/internal/y/y.go --
+package y
diff --git a/src/cmd/go/testdata/testterminal18153/terminal_test.go b/src/cmd/go/testdata/testterminal18153/terminal_test.go
new file mode 100644
index 0000000..71493ef
--- /dev/null
+++ b/src/cmd/go/testdata/testterminal18153/terminal_test.go
@@ -0,0 +1,39 @@
+// Copyright 2016 The Go Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE file.
+
+// +build linux
+
+// This test is run by src/cmd/dist/test.go (cmd_go_test_terminal),
+// and not by cmd/go's tests. This is because this test requires
+// that it be called with its stdout and stderr being a terminal.
+// dist doesn't run `cmd/go test` against this test directory if
+// dist's stdout/stderr aren't terminals.
+//
+// See issue 18153.
+
+package p
+
+import (
+	"syscall"
+	"testing"
+	"unsafe"
+)
+
+const ioctlReadTermios = syscall.TCGETS
+
+// isTerminal reports whether fd is a terminal.
+func isTerminal(fd uintptr) bool {
+	var termios syscall.Termios
+	_, _, err := syscall.Syscall6(syscall.SYS_IOCTL, fd, ioctlReadTermios, uintptr(unsafe.Pointer(&termios)), 0, 0, 0)
+	return err == 0
+}
+
+func TestIsTerminal(t *testing.T) {
+	if !isTerminal(1) {
+		t.Errorf("stdout is not a terminal")
+	}
+	if !isTerminal(2) {
+		t.Errorf("stderr is not a terminal")
+	}
+}
diff --git a/src/cmd/go/testdata/vendormod.txt b/src/cmd/go/testdata/vendormod.txt
new file mode 100644
index 0000000..1bdaf2a
--- /dev/null
+++ b/src/cmd/go/testdata/vendormod.txt
@@ -0,0 +1,160 @@
+generated by: go run savedir.go vendormod
+
+-- a/foo/AUTHORS.txt --
+-- a/foo/CONTRIBUTORS --
+-- a/foo/LICENSE --
+-- a/foo/PATENTS --
+-- a/foo/COPYING --
+-- a/foo/COPYLEFT --
+-- a/foo/licensed-to-kill --
+-- w/LICENSE --
+-- x/NOTICE! --
+-- x/x2/LICENSE --
+-- mypkg/LICENSE.txt --
+-- a/foo/bar/b/main.go --
+package b
+-- a/foo/bar/b/main_test.go --
+package b
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("../testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/foo/bar/c/main.go --
+package c
+-- a/foo/bar/c/main_test.go --
+package c
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("../../../testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+	if _, err := os.Stat("./testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/foo/bar/c/testdata/1 --
+-- a/foo/bar/testdata/1 --
+-- a/go.mod --
+module a
+-- a/main.go --
+package a
+-- a/main_test.go --
+package a
+
+import (
+	"os"
+	"testing"
+)
+
+func TestDir(t *testing.T) {
+	if _, err := os.Stat("./testdata/1"); err != nil {
+		t.Fatalf("testdata: %v", err)
+	}
+}
+-- a/testdata/1 --
+-- appengine.go --
+// +build appengine
+
+package m
+
+import _ "appengine"
+import _ "appengine/datastore"
+-- go.mod --
+module m
+
+require (
+	a v1.0.0
+	mysite/myname/mypkg v1.0.0
+	w v1.0.0 // indirect
+	x v1.0.0
+	y v1.0.0
+	z v1.0.0
+)
+
+replace (
+	a v1.0.0 => ./a
+	mysite/myname/mypkg v1.0.0 => ./mypkg
+	w v1.0.0 => ./w
+	x v1.0.0 => ./x
+	y v1.0.0 => ./y
+	z v1.0.0 => ./z
+)
+-- mypkg/go.mod --
+module me
+-- mypkg/mydir/d.go --
+package mydir
+-- subdir/v1_test.go --
+package m
+
+import _ "mysite/myname/mypkg/mydir"
+-- testdata1.go --
+package m
+
+import _ "a"
+-- testdata2.go --
+package m
+
+import _ "a/foo/bar/b"
+import _ "a/foo/bar/c"
+-- v1.go --
+package m
+
+import _ "x"
+-- v2.go --
+// +build abc
+
+package mMmMmMm
+
+import _ "y"
+-- v3.go --
+// +build !abc
+
+package m
+
+import _ "z"
+-- v4.go --
+// +build notmytag
+
+package m
+
+import _ "x/x1"
+-- w/go.mod --
+module w
+-- w/w.go --
+package w
+-- x/go.mod --
+module x
+-- x/testdata/x.txt --
+placeholder - want directory with no go files
+-- x/x.go --
+package x
+-- x/x1/x1.go --
+// +build notmytag
+
+package x1
+-- x/x2/dummy.txt --
+dummy
+-- x/x_test.go --
+package x
+
+import _ "w"
+-- y/go.mod --
+module y
+-- y/y.go --
+package y
+-- z/go.mod --
+module z
+-- z/z.go --
+package z