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// run
//go:build !js && !wasip1
// Copyright 2022 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 52127: Too many syntax errors in many files can
// cause deadlocks instead of displaying error messages
// correctly.
package main
import (
"bytes"
"fmt"
"os"
"os/exec"
"path/filepath"
)
func main() {
dir, err := os.MkdirTemp("", "issue52127")
if err != nil {
panic(err)
}
defer os.RemoveAll(dir)
args := []string{"go", "build"}
write := func(prefix string, i int, data string) {
filename := filepath.Join(dir, fmt.Sprintf("%s%d.go", prefix, i))
if err := os.WriteFile(filename, []byte(data), 0o644); err != nil {
panic(err)
}
args = append(args, filename)
}
for i := 0; i < 100; i++ {
write("a", i, `package p
`)
}
for i := 0; i < 100; i++ {
write("b", i, `package p
var
var
var
var
var
`)
}
cmd := exec.Command(args[0], args[1:]...)
output, err := cmd.CombinedOutput()
if err == nil {
panic("compile succeeded unexpectedly")
}
if !bytes.Contains(output, []byte("syntax error:")) {
panic(fmt.Sprintf(`missing "syntax error" in compiler output; got:
%s`, output))
}
}
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