1 files changed, 92 insertions, 0 deletions
diff --git a/test/fixedbugs/issue26411.go b/test/fixedbugs/issue26411.go
new file mode 100644
index 0000000..3ae9e03
--- /dev/null
+++ b/test/fixedbugs/issue26411.go
@@ -0,0 +1,92 @@
+// +build !nacl,!js,!wasip1
+// 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.
+
+// Ensure that label redefinition errors print out
+// a column number that matches the start of the current label's
+// definition instead of the label delimiting token ":"
+
+package main
+
+import (
+	"bytes"
+	"fmt"
+	"io/ioutil"
+	"log"
+	"os"
+	"os/exec"
+	"path/filepath"
+	"regexp"
+)
+
+func main() {
+	tmpdir, err := ioutil.TempDir("", "issue26411")
+	if err != nil {
+		log.Fatalf("Failed to create temporary directory: %v", err)
+	}
+	defer os.RemoveAll(tmpdir)
+
+	tests := []struct {
+		code   string
+		errors []string
+	}{
+		{
+			code: `
+package main
+
+func main() {
+foo:
+foo:
+}
+`,
+			errors: []string{
+				"^.+:5:1: label foo defined and not used\n",
+				".+:6:1: label foo already defined at .+:5:1\n$",
+			},
+		},
+		{
+			code: `
+package main
+
+func main() {
+
+            bar:
+   bar:
+bar:
+bar            :
+}
+`,
+
+			errors: []string{
+				"^.+:6:13: label bar defined and not used\n",
+				".+:7:4: label bar already defined at .+:6:13\n",
+				".+:8:1: label bar already defined at .+:6:13\n",
+				".+:9:1: label bar already defined at .+:6:13\n$",
+			},
+		},
+	}
+
+	for i, test := range tests {
+		filename := filepath.Join(tmpdir, fmt.Sprintf("%d.go", i))
+		if err := ioutil.WriteFile(filename, []byte(test.code), 0644); err != nil {
+			log.Printf("#%d: failed to create file %s", i, filename)
+			continue
+		}
+		output, _ := exec.Command("go", "tool", "compile", "-p=p", filename).CombinedOutput()
+
+		// remove each matching error from the output
+		for _, err := range test.errors {
+			rx := regexp.MustCompile(err)
+			match := rx.Find(output)
+			output = bytes.Replace(output, match, nil, 1) // remove match (which might be nil) from output
+		}
+
+		// at this point all output should have been consumed
+		if len(output) != 0 {
+			log.Printf("Test case %d has unmatched errors:\n%s", i, output)
+		}
+	}
+}