gcc/testsuite/go.test/test/fixedbugs/issue5704.go

   1 // run
   2
   3 // Copyright 2012 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 // Issue 5704: Conversions of empty strings to byte
   8 // or rune slices return empty but non-nil slices.
   9
  10 package main
  11
  12 type (
  13         mystring string
  14         mybytes  []byte
  15         myrunes  []rune
  16 )
  17
  18 func checkBytes(s []byte, arg string) {
  19         if len(s) != 0 {
  20                 panic("len(" + arg + ") != 0")
  21         }
  22         if s == nil {
  23                 panic(arg + " == nil")
  24         }
  25 }
  26
  27 func checkRunes(s []rune, arg string) {
  28         if len(s) != 0 {
  29                 panic("len(" + arg + ") != 0")
  30         }
  31         if s == nil {
  32                 panic(arg + " == nil")
  33         }
  34 }
  35
  36 func main() {
  37         checkBytes([]byte(""), `[]byte("")`)
  38         checkBytes([]byte(mystring("")), `[]byte(mystring(""))`)
  39         checkBytes(mybytes(""), `mybytes("")`)
  40         checkBytes(mybytes(mystring("")), `mybytes(mystring(""))`)
  41
  42         checkRunes([]rune(""), `[]rune("")`)
  43         checkRunes([]rune(mystring("")), `[]rune(mystring(""))`)
  44         checkRunes(myrunes(""), `myrunes("")`)
  45         checkRunes(myrunes(mystring("")), `myrunes(mystring(""))`)
  46 }