| // 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. |
| |
| package main |
| |
| import ( |
| "strings" |
| ) |
| |
| type T struct{} |
| |
| const maxInt = int(^uint(0) >> 1) |
| |
| func main() { |
| s := make([]T, maxInt) |
| shouldPanic("cap out of range", func() { s = append(s, T{}) }) |
| var oneElem = make([]T, 1) |
| shouldPanic("cap out of range", func() { s = append(s, oneElem...) }) |
| } |
| |
| func shouldPanic(str string, f func()) { |
| defer func() { |
| err := recover() |
| if err == nil { |
| panic("did not panic") |
| } |
| s := err.(error).Error() |
| if !strings.Contains(s, str) { |
| panic("got panic " + s + ", want " + str) |
| } |
| }() |
| |
| f() |
| } |
