mirror of
https://github.com/golang/go
synced 2024-11-17 20:24:46 -07:00
30 lines
674 B
Go
30 lines
674 B
Go
|
// run
|
||
|
|
|
||
|
|
// Copyright 2018 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.
|
||
|
|
|
||
|
|
// Test that string([]byte(string)) makes a copy and doesn't reduce to
|
||
|
|
// nothing. (Issue 25834)
|
||
|
|
|
||
|
|
package main
|
||
|
|
|
||
|
|
import (
|
||
|
|
"reflect"
|
||
|
|
"unsafe"
|
||
|
|
)
|
||
|
|
|
||
|
|
func main() {
|
||
|
|
var (
|
||
|
|
buf = make([]byte, 2<<10)
|
||
|
|
large = string(buf)
|
||
|
|
sub = large[10:12]
|
||
|
|
subcopy = string([]byte(sub))
|
||
|
|
subh = *(*reflect.StringHeader)(unsafe.Pointer(&sub))
|
||
|
|
subcopyh = *(*reflect.StringHeader)(unsafe.Pointer(&subcopy))
|
||
|
|
)
|
||
|
|
if subh.Data == subcopyh.Data {
|
||
|
|
panic("sub and subcopy have the same underlying array")
|
||
|
|
}
|
||
|
|
}
|