1 // run 2 3 // Copyright 2013 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 type T []int 15 16 func main() { 17 n := -1 18 shouldPanic("len out of range", func() {_ = make(T, n)}) 19 shouldPanic("cap out of range", func() {_ = make(T, 0, n)}) 20 var t *byte 21 if unsafe.Sizeof(t) == 8 { 22 n = 1<<20 23 n <<= 20 24 shouldPanic("len out of range", func() {_ = make(T, n)}) 25 shouldPanic("cap out of range", func() {_ = make(T, 0, n)}) 26 n <<= 20 27 shouldPanic("len out of range", func() {_ = make(T, n)}) 28 shouldPanic("cap out of range", func() {_ = make(T, 0, n)}) 29 } else { 30 n = 1<<31 - 1 31 shouldPanic("len out of range", func() {_ = make(T, n)}) 32 shouldPanic("cap out of range", func() {_ = make(T, 0, n)}) 33 } 34 } 35 36 func shouldPanic(str string, f func()) { 37 defer func() { 38 err := recover() 39 if err == nil { 40 panic("did not panic") 41 } 42 s := err.(error).Error() 43 if !strings.Contains(s, str) { 44 panic("got panic " + s + ", want " + str) 45 } 46 }() 47 48 f() 49 } 50
