/usr/share/go-1.8/test/fixedbugs/issue11771.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// run
// 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.
// Issue 11771: Magic comments should ignore carriage returns.
package main
import (
"bytes"
"fmt"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
"runtime"
)
func main() {
if runtime.Compiler != "gc" {
return
}
dir, err := ioutil.TempDir("", "go-issue11771")
if err != nil {
log.Fatalf("creating temp dir: %v\n", err)
}
defer os.RemoveAll(dir)
// The go:nowritebarrier magic comment is only permitted in
// the runtime package. So we confirm that the compilation
// fails.
var buf bytes.Buffer
fmt.Fprintln(&buf, `
package main
func main() {
}
`)
fmt.Fprintln(&buf, "//go:nowritebarrier\r")
fmt.Fprintln(&buf, `
func x() {
}
`)
if err := ioutil.WriteFile(filepath.Join(dir, "x.go"), buf.Bytes(), 0666); err != nil {
log.Fatal(err)
}
cmd := exec.Command("go", "tool", "compile", "x.go")
cmd.Dir = dir
output, err := cmd.CombinedOutput()
if err == nil {
log.Fatal("compile succeeded unexpectedly")
}
if !bytes.Contains(output, []byte("only allowed in runtime")) {
log.Fatalf("wrong error message from compiler; got:\n%s\n", output)
}
}
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