issue65417.go

     1  // run
     2  
     3  // Copyright 2024 The Go Authors. All rights reserved.
     4  // Use of this source code is governed by a BSD-style
     5  // license that can be found in the LICENSE file.
     6  
     7  package main
     8  
     9  import (
    10  	"strings"
    11  	"unsafe"
    12  )
    13  
    14  func main() {
    15  	shouldPanic("runtime error: index out of range", func() { f(0) })
    16  	shouldPanic("runtime error: index out of range", func() { g(0) })
    17  }
    18  
    19  func f[T byte](t T) {
    20  	const str = "a"
    21  	_ = str[unsafe.Sizeof(t)]
    22  }
    23  
    24  func g[T byte](t T) {
    25  	const str = "a"
    26  	_ = str[unsafe.Sizeof(t)+0]
    27  }
    28  
    29  func shouldPanic(str string, f func()) {
    30  	defer func() {
    31  		err := recover()
    32  		if err == nil {
    33  			panic("did not panic")
    34  		}
    35  		s := err.(error).Error()
    36  		if !strings.Contains(s, str) {
    37  			panic("got panic " + s + ", want " + str)
    38  		}
    39  	}()
    40  
    41  	f()
    42  }
    43
View as plain text