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// +build !nacl,!js
// 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", 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)
}
}
}
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