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// $G $F.go && $L $F.$A && ./$A.out

// 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.

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++
        }
}