go issue4562 源码
golang issue4562 代码
文件路径：/test/fixedbugs/issue4562.go
// run
// Copyright 2012 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.
package main
import (
"fmt"
"runtime"
"strings"
)
type T struct {
val int
}
func main() {
defer expectError(22)
var pT *T
switch pT.val { // error should be here - line 22
case 0:
fmt.Println("0")
case 1: // used to show up here instead
fmt.Println("1")
case 2:
fmt.Println("2")
}
fmt.Println("finished")
}
func expectError(expectLine int) {
if recover() == nil {
panic("did not crash")
}
for i := 1;; i++ {
_, file, line, ok := runtime.Caller(i)
if !ok {
panic("cannot find issue4562.go on stack")
}
if strings.HasSuffix(file, "issue4562.go") {
if line != expectLine {
panic(fmt.Sprintf("crashed at line %d, wanted line %d", line, expectLine))
}
break
}
}
}
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