mirror of
https://github.com/golang/go
synced 2024-11-26 22:11:25 -07:00
de47f68c99
The existing compilers convert empty strings to empty but non-nil byte and rune slices. The spec required a nil byte and rune slice in those cases. That seems an odd additional requirement. Adjust the spec to match the reality. Also, removed over-specification for conversions of nil []byte and []rune: such nil slices already act like empty slices and thus don't need extra language. Added extra examples instead. Fixes #5704. R=rsc, r, iant CC=golang-dev https://golang.org/cl/10440045
47 lines
1.0 KiB
Go
47 lines
1.0 KiB
Go
// run
|
|
|
|
// Copyright 2012 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.
|
|
|
|
// Issue 5704: Conversions of empty strings to byte
|
|
// or rune slices return empty but non-nil slices.
|
|
|
|
package main
|
|
|
|
type (
|
|
mystring string
|
|
mybytes []byte
|
|
myrunes []rune
|
|
)
|
|
|
|
func checkBytes(s []byte, arg string) {
|
|
if len(s) != 0 {
|
|
panic("len(" + arg + ") != 0")
|
|
}
|
|
if s == nil {
|
|
panic(arg + " == nil")
|
|
}
|
|
}
|
|
|
|
func checkRunes(s []rune, arg string) {
|
|
if len(s) != 0 {
|
|
panic("len(" + arg + ") != 0")
|
|
}
|
|
if s == nil {
|
|
panic(arg + " == nil")
|
|
}
|
|
}
|
|
|
|
func main() {
|
|
checkBytes([]byte(""), `[]byte("")`)
|
|
checkBytes([]byte(mystring("")), `[]byte(mystring(""))`)
|
|
checkBytes(mybytes(""), `mybytes("")`)
|
|
checkBytes(mybytes(mystring("")), `mybytes(mystring(""))`)
|
|
|
|
checkRunes([]rune(""), `[]rune("")`)
|
|
checkRunes([]rune(mystring("")), `[]rune(mystring(""))`)
|
|
checkRunes(myrunes(""), `myrunes("")`)
|
|
checkRunes(myrunes(mystring("")), `myrunes(mystring(""))`)
|
|
}
|