func (p Properties) CCC() uint8 {
	if p.index >= firstCCCZeroExcept {
		return 0
	}
	return ccc[p.ccc]
}

// LeadCCC returns the CCC of the first rune in the decomposition.
// If there is no decomposition, LeadCCC equals CCC.
func (p Properties) LeadCCC() uint8 {
	return ccc[p.ccc]
}

// TrailCCC returns the CCC of the last rune in the decomposition.

func TestIsControlLatin1(t *testing.T) {
	for i := rune(0); i <= MaxLatin1; i++ {
		got := IsControl(i)
		want := false
		switch {
		case 0x00 <= i && i <= 0x1F:
			want = true
		case 0x7F <= i && i <= 0x9F:
			want = true
		}
		if got != want {
			t.Errorf("%U incorrect: got %t; want %t", i, got, want)
		}
	}
}

func TestIsLetterLatin1(t *testing.T) {
	for i := rune(0); i <= MaxLatin1; i++ {
		got := IsLetter(i)

func decodeWTF16(s []uint16, buf []byte) []byte {
	for i := 0; i < len(s); i++ {
		var ar rune
		switch r := s[i]; {
		case r < surr1, surr3 <= r:
			// normal rune
			ar = rune(r)
		case surr1 <= r && r < surr2 && i+1 < len(s) &&
			surr2 <= s[i+1] && s[i+1] < surr3:
			// valid surrogate sequence
			ar = utf16.DecodeRune(rune(r), rune(s[i+1]))
			i++
		default:
			// WTF-8 fallback.

func (i *Inst) MatchRunePos(r rune) int {
	rune := i.Rune

	switch len(rune) {
	case 0:
		return noMatch

	case 1:
		// Special case: single-rune slice is from literal string, not char class.
		r0 := rune[0]
		if r == r0 {
			return 0
		}
		if Flags(i.Arg)&FoldCase != 0 {
			for r1 := unicode.SimpleFold(r0); r1 != r0; r1 = unicode.SimpleFold(r1) {
				if r == r1 {
					return 0
				}
			}
		}

	}
	return isExcludingLatin(Letter, r)
}

// IsMark reports whether the rune is a mark character (category [M]).
func IsMark(r rune) bool {
	// There are no mark characters in Latin-1.
	return isExcludingLatin(Mark, r)
}

// IsNumber reports whether the rune is a number (category [N]).
func IsNumber(r rune) bool {
	if uint32(r) <= MaxLatin1 {
		return properties[uint8(r)]&pN != 0
	}

	{string(rune(14)), false},
	{string(rune(15)), false},
	{string(rune(16)), false},
	{string(rune(17)), false},
	{string(rune(18)), false},
	{string(rune(19)), false},
	{string(rune(20)), false},
	{string(rune(21)), false},
	{string(rune(22)), false},
	{string(rune(23)), false},
	{string(rune(24)), false},
	{string(rune(25)), false},
	{string(rune(26)), false},
	{string(rune(27)), false},
	{string(rune(28)), false},

package p

type Foo[T any] struct {
}

func (foo Foo[T]) Get()  {
}

var(
	_ = Foo[byte]{}
	_ = Foo[[]byte]{}
	_ = Foo[map[byte]rune]{}

	_ = Foo[rune]{}
	_ = Foo[[]rune]{}
	_ = Foo[map[rune]byte]{}

}

func appendQuotedRuneWith(buf []byte, r rune, quote byte, ASCIIonly, graphicOnly bool) []byte {
	buf = append(buf, quote)
	if !utf8.ValidRune(r) {
		r = utf8.RuneError
	}
	buf = appendEscapedRune(buf, r, quote, ASCIIonly, graphicOnly)
	buf = append(buf, quote)
	return buf
}

func appendEscapedRune(buf []byte, r rune, quote byte, ASCIIonly, graphicOnly bool) []byte {
	if r == rune(quote) || r == '\\' { // always backslashed

	p.numRunes += len(re.Rune)
	if re.Op == OpCharClass && len(re.Rune) == 2 && re.Rune[0] == re.Rune[1] {
		// Single rune.
		if p.maybeConcat(re.Rune[0], p.flags&^FoldCase) {
			return nil
		}
		re.Op = OpLiteral
		re.Rune = re.Rune[:1]
		re.Flags = p.flags &^ FoldCase
	} else if re.Op == OpCharClass && len(re.Rune) == 4 &&
		re.Rune[0] == re.Rune[1] && re.Rune[2] == re.Rune[3] &&

func countrunes(s string) int {
	n := 0
	for range s {
		n++
	}
	return n
}

// decoderune returns the non-ASCII rune at the start of
// s[k:] and the index after the rune in s.
//
// decoderune assumes that caller has checked that
// the to be decoded rune is a non-ASCII rune.
//
// If the string appears to be incomplete or decoding problems
// are encountered (runeerror, k + 1) is returned to ensure