}
	copy(b, s)
	return b
}

func stringtoslicerune(buf *[tmpStringBufSize]rune, s string) []rune {
	// two passes.
	// unlike slicerunetostring, no race because strings are immutable.
	n := 0
	for range s {
		n++
	}

	var a []rune
	if buf != nil && n <= len(buf) {
		*buf = [tmpStringBufSize]rune{}
		a = buf[:n]
	} else {
		a = rawruneslice(n)
	}

	n = 0

	Flag(c int) bool
}

// Formatter is implemented by any value that has a Format method.
// The implementation controls how [State] and rune are interpreted,
// and may call [Sprint] or [Fprint](f) etc. to generate its output.
type Formatter interface {
	Format(f State, verb rune)
}

// Stringer is implemented by any value that has a String method,
// which defines the “native” format for that value.

// license that can be found in the LICENSE file.

//go:build !go1.16

package idna

// appendMapping appends the mapping for the respective rune. isMapped must be
// true. A mapping is a categorization of a rune as defined in UTS #46.
func (c info) appendMapping(b []byte, s string) []byte {
	index := int(c >> indexShift)
	if c&xorBit == 0 {
		s := mappings[index:]
		return append(b, s[1:s[0]+1]...)

//
//	q := strconv.Quote("Hello, 世界")
//	q := strconv.QuoteToASCII("Hello, 世界")
//
// [QuoteRune] and [QuoteRuneToASCII] are similar but accept runes and
// return quoted Go rune literals.
//
// [Unquote] and [UnquoteChar] unquote Go string and rune literals.

		{NewTypeName(nopos, pkg, "int32", Typ[Int32]), true},              // type name is declared in user-defined package (outside Universe)
		{NewTypeName(nopos, nil, "rune", Typ[Rune]), true},                // type name refers to basic type rune which is an alias already
		{t5, false}, // type name refers to type parameter and vice versa
	} {
		check(test.name, test.alias)
	}
}

// from integers to strings.
//
// # Analyzer stringintconv
//
// stringintconv: check for string(int) conversions
//
// This checker flags conversions of the form string(x) where x is an integer
// (but not byte or rune) type. Such conversions are discouraged because they
// return the UTF-8 representation of the Unicode code point x, and not a decimal
// string representation of x as one might expect. Furthermore, if x denotes an

		{NewTypeName(nopos, pkg, "int32", Typ[Int32]), true},              // type name is declared in user-defined package (outside Universe)
		{NewTypeName(nopos, nil, "rune", Typ[Rune]), true},                // type name refers to basic type rune which is an alias already
		{t5, false}, // type name refers to type parameter and vice versa
	} {
		check(test.name, test.alias)
	}
}

	}

	// 5. Drop
	dropNotLatin := func(r rune) rune {
		if unicode.Is(unicode.Latin, r) {
			return r
		}
		return -1
	}
	m = Map(dropNotLatin, []byte("Hello, 세계"))
	expect = "Hello"
	if string(m) != expect {
		t.Errorf("drop: expected %q got %q", expect, m)
	}

	// 6. Invalid rune
	invalidRune := func(r rune) rune {
		return utf8.MaxRune + 1
	}

		mapPointerKeyT: func() {
			a := make(map[*rune]rune)
			for i := 0; i < length; i++ {
				a[new(rune)] = rune(i)
				runtime.Gosched()
			}
			for i := 0; i < mods; i++ {
				for k, _ := range a {
					a[k]++
					runtime.Gosched()
				}
			}
		},
		chanT: func() {
			a := make(chan rune)
			for i := 0; i < mods; i++ {
				go func() { a <- rune(i) }()
				<-a
				runtime.Gosched()

			b.ReportMetric(float64(latencies[len(latencies)*99/100]), "p99-ns")
		}
		return func(b *testing.B) {
			b.Run("idle", runOne)

			b.Run("loaded", func(b *testing.B) {
				stop := applyGCLoad(b)
				runOne(b)
				// Make sure to stop the timer before we wait! The load created above
				// is very heavy-weight and not easy to stop, so we could end up