mirror of
https://github.com/golang/go
synced 2024-11-23 09:50:03 -07:00
f8f630f5ec
newstackcall creates a new stack segment, and we want to be able to throw away all that code. LGTM=khr R=khr, iant CC=dvyukov, golang-codereviews, r https://golang.org/cl/139270043
57 lines
1022 B
Go
57 lines
1022 B
Go
// run
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// Copyright 2014 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package main
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import (
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"fmt"
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"io"
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"runtime"
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)
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type T struct {
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io.Closer
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}
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func f1() {
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// The 5 here and below depends on the number of internal runtime frames
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// that sit between a deferred function called during panic and
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// the original frame. If that changes, this test will start failing and
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// the number here will need to be updated.
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defer checkLine(5)
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var t *T
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var c io.Closer = t
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c.Close()
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}
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func f2() {
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defer checkLine(5)
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var t T
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var c io.Closer = t
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c.Close()
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}
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func main() {
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f1()
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f2()
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}
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func checkLine(n int) {
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if err := recover(); err == nil {
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panic("did not panic")
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}
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var file string
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var line int
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for i := 1; i <= n; i++ {
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_, file, line, _ = runtime.Caller(i)
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if file != "<autogenerated>" || line != 1 {
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continue
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}
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return
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}
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panic(fmt.Sprintf("expected <autogenerated>:1 have %s:%d", file, line))
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}
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