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https://github.com/golang/go
synced 2024-11-23 14:50:07 -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
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// Copyright 2012 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Issue 5704: Conversions of empty strings to byte
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// or rune slices return empty but non-nil slices.
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package main
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type (
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mystring string
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mybytes []byte
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myrunes []rune
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)
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func checkBytes(s []byte, arg string) {
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if len(s) != 0 {
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panic("len(" + arg + ") != 0")
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}
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if s == nil {
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panic(arg + " == nil")
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}
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}
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func checkRunes(s []rune, arg string) {
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if len(s) != 0 {
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panic("len(" + arg + ") != 0")
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}
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if s == nil {
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panic(arg + " == nil")
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}
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}
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func main() {
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checkBytes([]byte(""), `[]byte("")`)
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checkBytes([]byte(mystring("")), `[]byte(mystring(""))`)
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checkBytes(mybytes(""), `mybytes("")`)
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checkBytes(mybytes(mystring("")), `mybytes(mystring(""))`)
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checkRunes([]rune(""), `[]rune("")`)
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checkRunes([]rune(mystring("")), `[]rune(mystring(""))`)
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checkRunes(myrunes(""), `myrunes("")`)
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checkRunes(myrunes(mystring("")), `myrunes(mystring(""))`)
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}
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