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Source file test/fixedbugs/issue11771.go

Documentation: test/fixedbugs

  // +build !nacl
  // 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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