go issue46234 源码
golang issue46234 代码
文件路径：/test/fixedbugs/issue46234.go
// buildrun -t 45
//go:build !js
// +build !js
// Copyright 2021 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 runtime traceback does not infinite loop for
// the testcase below.
package main
import (
"bytes"
"io/ioutil"
"log"
"os"
"os/exec"
"path/filepath"
)
const prog = `
package main
import "context"
var gpi *int
type nAO struct {
eE bool
}
type NAO func(*nAO)
func WEA() NAO {
return func(o *nAO) { o.eE = true }
}
type R struct {
cM *CM
}
type CM int
type A string
func (m *CM) NewA(ctx context.Context, cN string, nn *nAO, opts ...NAO) (*A, error) {
for _, o := range opts {
o(nn)
}
s := A("foo")
return &s, nil
}
func (r *R) CA(ctx context.Context, cN string, nn *nAO) (*int, error) {
cA, err := r.cM.NewA(ctx, cN, nn, WEA(), WEA())
if err == nil {
return nil, err
}
println(cA)
x := int(42)
return &x, nil
}
func main() {
c := CM(1)
r := R{cM: &c}
var ctx context.Context
nnr := nAO{}
pi, err := r.CA(ctx, "foo", nil)
if err != nil {
panic("bad")
}
println(nnr.eE)
gpi = pi
}
`
func main() {
dir, err := ioutil.TempDir("", "46234")
if err != nil {
log.Fatal(err)
}
defer os.RemoveAll(dir)
file := filepath.Join(dir, "main.go")
if err := ioutil.WriteFile(file, []byte(prog), 0655); err != nil {
log.Fatalf("Write error %v", err)
}
cmd := exec.Command("go", "run", file)
output, err := cmd.CombinedOutput()
if err == nil {
log.Fatalf("Passed, expected an error")
}
want := []byte("nil pointer dereference")
if !bytes.Contains(output, want) {
log.Fatalf("Unmatched error message %q:\nin\n%s\nError: %v", want, output, err)
}
}
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