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// +build !js,gc
// run
// 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.
// Verify the impact of line directives on error positions and position formatting.
package main
import (
"io/ioutil"
"log"
"os"
"os/exec"
"strings"
)
// Each of these tests is expected to fail (missing package clause)
// at the position determined by the preceding line directive.
var tests = []struct {
src, pos string
}{
{"//line :10\n", ":10:"}, // no filename means no filename
{"//line :10:4\n", "filename:10:4"}, // no filename means use existing filename
{"//line foo.go:10\n", "foo.go:10:"}, // no column means don't print a column
{"//line foo.go:10:4\n", "foo.go:10:4:"}, // column means print a column
{"//line foo.go:10:4\n\n", "foo.go:11:1:"}, // relative columns start at 1 after newline
{"/*line :10*/", ":10:"},
{"/*line :10:4*/", "filename:10:4"},
{"/*line foo.go:10*/", "foo.go:10:"},
{"/*line foo.go:10:4*/", "foo.go:10:4:"},
{"/*line foo.go:10:4*/\n", "foo.go:11:1:"},
}
func main() {
f, err := ioutil.TempFile("", "issue22662b.go")
if err != nil {
log.Fatal(err)
}
f.Close()
defer os.Remove(f.Name())
for _, test := range tests {
if err := ioutil.WriteFile(f.Name(), []byte(test.src), 0660); err != nil {
log.Fatal(err)
}
out, err := exec.Command("go", "tool", "compile", f.Name()).CombinedOutput()
if err == nil {
log.Fatalf("expected compiling\n---\n%s\n---\nto fail", test.src)
}
errmsg := strings.Replace(string(out), f.Name(), "filename", -1) // use "filename" instead of actual (long) filename
if !strings.HasPrefix(errmsg, test.pos) {
log.Fatalf("%q: got %q; want position %q", test.src, errmsg, test.pos)
}
}
}
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