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Source file test/fixedbugs/issue4085b.go

Documentation: test/fixedbugs

  // run
  
  // Copyright 2013 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"
  	"unsafe"
  )
  
  type T []int
  
  func main() {
  	n := -1
  	shouldPanic("len out of range", func() { _ = make(T, n) })
  	shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
  	shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
  	shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
  	var t *byte
  	if unsafe.Sizeof(t) == 8 {
  		n = 1 << 20
  		n <<= 20
  		shouldPanic("len out of range", func() { _ = make(T, n) })
  		shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
  		n <<= 20
  		shouldPanic("len out of range", func() { _ = make(T, n) })
  		shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
  	} else {
  		n = 1<<31 - 1
  		shouldPanic("len out of range", func() { _ = make(T, n) })
  		shouldPanic("cap out of range", func() { _ = make(T, 0, n) })
  		shouldPanic("len out of range", func() { _ = make(T, int64(n)) })
  		shouldPanic("cap out of range", func() { _ = make(T, 0, int64(n)) })
  	}
  }
  
  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()
  }
  

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