/usr/share/go-1.8/test/utf.go is in golang-1.8-src 1.8.3-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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// Copyright 2009 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.
// Test UTF-8 in strings and character constants.
package main
import "unicode/utf8"
func main() {
var chars [6]rune
chars[0] = 'a'
chars[1] = 'b'
chars[2] = 'c'
chars[3] = '\u65e5'
chars[4] = '\u672c'
chars[5] = '\u8a9e'
s := ""
for i := 0; i < 6; i++ {
s += string(chars[i])
}
var l = len(s)
for w, i, j := 0, 0, 0; i < l; i += w {
var r rune
r, w = utf8.DecodeRuneInString(s[i:len(s)])
if w == 0 {
panic("zero width in string")
}
if r != chars[j] {
panic("wrong value from string")
}
j++
}
// encoded as bytes: 'a' 'b' 'c' e6 97 a5 e6 9c ac e8 aa 9e
const L = 12
if L != l {
panic("wrong length constructing array")
}
a := make([]byte, L)
a[0] = 'a'
a[1] = 'b'
a[2] = 'c'
a[3] = 0xe6
a[4] = 0x97
a[5] = 0xa5
a[6] = 0xe6
a[7] = 0x9c
a[8] = 0xac
a[9] = 0xe8
a[10] = 0xaa
a[11] = 0x9e
for w, i, j := 0, 0, 0; i < L; i += w {
var r rune
r, w = utf8.DecodeRune(a[i:L])
if w == 0 {
panic("zero width in bytes")
}
if r != chars[j] {
panic("wrong value from bytes")
}
j++
}
}
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