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39ad208c13
Fixes #25834 Change-Id: I33e58dabfd04b84dfee1a9a3796796b5d19862e7 Reviewed-on: https://go-review.googlesource.com/118295 Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org> Reviewed-by: Ian Lance Taylor <iant@golang.org>
29 lines
674 B
Go
29 lines
674 B
Go
// run
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// Copyright 2018 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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// Test that string([]byte(string)) makes a copy and doesn't reduce to
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// nothing. (Issue 25834)
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package main
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import (
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"reflect"
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"unsafe"
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)
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func main() {
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var (
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buf = make([]byte, 2<<10)
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large = string(buf)
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sub = large[10:12]
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subcopy = string([]byte(sub))
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subh = *(*reflect.StringHeader)(unsafe.Pointer(&sub))
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subcopyh = *(*reflect.StringHeader)(unsafe.Pointer(&subcopy))
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)
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if subh.Data == subcopyh.Data {
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panic("sub and subcopy have the same underlying array")
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}
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}
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