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 } 47
