Source file test/fixedbugs/issue24187.go

     1  // run
     2  
     3  //go:build amd64p32
     4  
     5  // Copyright 2018 The Go Authors. All rights reserved.
     6  // Use of this source code is governed by a BSD-style
     7  // license that can be found in the LICENSE file.
     8  
     9  package main
    10  
    11  import (
    12  	"bytes"
    13  	"fmt"
    14  	"unsafe"
    15  )
    16  
    17  func main() {
    18  	b := make([]byte, 128)
    19  	for i := range b {
    20  		b[i] = 1
    21  	}
    22  	if bytes.IndexByte(b, 0) != -1 {
    23  		panic("found 0")
    24  	}
    25  	for i := range b {
    26  		b[i] = 0
    27  		c := b
    28  		*(*int)(unsafe.Pointer(uintptr(unsafe.Pointer(&c)) + unsafe.Sizeof(uintptr(0)))) = 1<<31 - 1
    29  		if bytes.IndexByte(c, 0) != i {
    30  			panic(fmt.Sprintf("missing 0 at %d\n", i))
    31  		}
    32  		b[i] = 1
    33  	}
    34  }
    35  

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