"reflect"
	"testing"
	"unicode"
	. "unicode/utf16"
)

// Validate the constants redefined from unicode.
func TestConstants(t *testing.T) {
	if MaxRune != unicode.MaxRune {
		t.Errorf("utf16.maxRune is wrong: %x should be %x", MaxRune, unicode.MaxRune)
	}
	if ReplacementChar != unicode.ReplacementChar {
		t.Errorf("utf16.replacementChar is wrong: %x should be %x", ReplacementChar, unicode.ReplacementChar)
	}
}

package utf16

// The conditions replacementChar==unicode.ReplacementChar and
// maxRune==unicode.MaxRune are verified in the tests.
// Defining them locally avoids this package depending on package unicode.

const (
	replacementChar = '\uFFFD'     // Unicode replacement character
	maxRune         = '\U0010FFFF' // Maximum valid Unicode code point.
)

const (

package utf16

// Extra names for constants so we can validate them during testing.
const (
	Surr1           = surr1
	Surr3           = surr3
	SurrSelf        = surrSelf
	MaxRune         = maxRune
	ReplacementChar = replacementChar

	}
	return y
}

func main() {
	flag.Parse()

	rang, except := scan(0, 0xFFFF)
	range16 = to16(rang)
	except16 = to16(except)
	range32, except32 = scan(0x10000, unicode.MaxRune)

	for i := rune(0); i <= unicode.MaxRune; i++ {
		if isPrint(i) != unicode.IsPrint(i) {
			log.Fatalf("%U: isPrint=%v, want %v\n", i, isPrint(i), unicode.IsPrint(i))
		}
	}

	var buf bytes.Buffer

// MaxRune==unicode.MaxRune are verified in the tests.
// Defining them locally avoids this package depending on package unicode.

// Numbers fundamental to the encoding.
const (
	RuneError = '\uFFFD'     // the "error" Rune or "Unicode replacement character"
	RuneSelf  = 0x80         // characters below RuneSelf are represented as themselves in a single byte.

	// 1.  Grow. This triggers two reallocations in Map.
	maxRune := func(rune) rune { return unicode.MaxRune }
	m := Map(maxRune, a)
	expect := tenRunes(unicode.MaxRune)
	if m != expect {
		t.Errorf("growing: expected %q got %q", expect, m)
	}

	// 2. Shrink
	minRune := func(rune) rune { return 'a' }
	m = Map(minRune, tenRunes(unicode.MaxRune))
	expect = a
	if m != expect {

// If the character is not valid Unicode, it will print '\ufffd'.
func (f *fmt) fmtC(c uint64) {
	// Explicitly check whether c exceeds utf8.MaxRune since the conversion
	// of a uint64 to a rune may lose precision that indicates an overflow.
	r := rune(c)
	if c > utf8.MaxRune {
		r = utf8.RuneError
	}
	buf := f.intbuf[:0]
	f.pad(utf8.AppendRune(buf, r))
}

	case OpCharClass:
		re.Rune = cleanClass(&re.Rune)
		if len(re.Rune) == 2 && re.Rune[0] == 0 && re.Rune[1] == unicode.MaxRune {
			re.Rune = nil
			re.Op = OpAnyChar
			return
		}
		if len(re.Rune) == 4 && re.Rune[0] == 0 && re.Rune[1] == '\n'-1 && re.Rune[2] == '\n'+1 && re.Rune[3] == unicode.MaxRune {
			re.Rune = nil
			re.Op = OpAnyCharNotNL
			return
		}
		if cap(re.Rune)-len(re.Rune) > 100 {

	f.Add(rune(-1))
	f.Add(rune(0xd800))
	f.Add(rune(0xdfff))
	f.Add(rune(unicode.ReplacementChar))
	f.Add(rune(unicode.MaxASCII))
	f.Add(rune(unicode.MaxLatin1))
	f.Add(rune(unicode.MaxRune))
	f.Add(rune(unicode.MaxRune + 1))
	f.Add(rune(-0x80000000))
	f.Add(rune(0x7fffffff))

	f.Fuzz(func(t *testing.T, r1 rune) {
		b := marshalCorpusFile(r1)
		t.Logf("marshaled rune(0x%x):\n%s", r1, b)

	// 1.  Grow. This triggers two reallocations in Map.
	maxRune := func(r rune) rune { return unicode.MaxRune }
	m := Map(maxRune, []byte(a))
	expect := tenRunes(unicode.MaxRune)
	if string(m) != expect {
		t.Errorf("growing: expected %q got %q", expect, m)
	}

	// 2. Shrink
	minRune := func(r rune) rune { return 'a' }
	m = Map(minRune, []byte(tenRunes(unicode.MaxRune)))
	expect = a
	if string(m) != expect {