{[]rune{1, 2, 3, 4}, []uint16{1, 2, 3, 4}},
	{[]rune{0xffff, 0x10000, 0x10001, 0x12345, 0x10ffff},
		[]uint16{0xffff, 0xd800, 0xdc00, 0xd800, 0xdc01, 0xd808, 0xdf45, 0xdbff, 0xdfff}},
	{[]rune{'a', 'b', 0xd7ff, 0xd800, 0xdfff, 0xe000, 0x110000, -1},
		[]uint16{'a', 'b', 0xd7ff, 0xfffd, 0xfffd, 0xe000, 0xfffd, 0xfffd}},
}

func TestEncode(t *testing.T) {
	for _, tt := range encodeTests {
		out := Encode(tt.in)

		wstr: []uint16{0xD800, 0xD800},
	},
	{
		// "High surrogate followed by a symbol that is not a surrogate"
		str:  string([]byte{0xED, 0xA0, 0x80, 0xA}),
		wstr: []uint16{0xD800, 0xA},
	},
	{
		// "Unmatched high surrogate, followed by a surrogate pair, followed by an unmatched high surrogate"
		str:  string([]byte{0xED, 0xA0, 0x80, 0xF0, 0x9D, 0x8C, 0x86, 0xED, 0xA0, 0x80}),
		wstr: []uint16{0xD800, 0xD834, 0xDF06, 0xD800},
	},
	{

	maxRune         = '\U0010FFFF' // Maximum valid Unicode code point.
)

const (
	// 0xd800-0xdc00 encodes the high 10 bits of a pair.
	// 0xdc00-0xe000 encodes the low 10 bits of a pair.
	// the value is those 20 bits plus 0x10000.
	surr1 = 0xd800
	surr2 = 0xdc00
	surr3 = 0xe000

	surrSelf = 0x10000
)

// IsSurrogate reports whether the specified Unicode code point

//
// See go.dev/issues/59971 for more info.

package syscall

import (
	"unicode/utf16"
	"unicode/utf8"
)

const (
	surr1 = 0xd800
	surr2 = 0xdc00
	surr3 = 0xe000

	tx    = 0b10000000
	t3    = 0b11100000
	maskx = 0b00111111
	mask3 = 0b00001111

	rune1Max = 1<<7 - 1
	rune2Max = 1<<11 - 1
)

// encodeWTF16 returns the potentially ill-formed

byte('\'')
math.Float64frombits(0x7ff8000000000002)
math.Float32frombits(0x7fc00001)`,
		},
		{
			desc: "rune validation",
			in: `go test fuzz v1
rune(0)
rune(0x41)
rune(-1)
rune(0xfffd)
rune(0xd800)
rune(0x10ffff)
rune(0x110000)
`,
			want: `go test fuzz v1
rune('\x00')
rune('A')
int32(-1)
rune('�')
int32(55296)
rune('\U0010ffff')
int32(1114112)`,
		},
		{

		{'A', true},
		{'Z', true},
		{'a', true},
		{'z', true},
		{'_', true},
		{'-', true},
		{':', false},
		{';', false},
		{' ', false},
		{0x7f, false},
		{0x80, true},
		{0x1234, true},
		{0xd800, false},
		{0xdc00, false},
		{0xfffe, false},
		{0x10000, true},
		{0x110000, false},
	}
	for _, test := range tests {
		got := isCSSNmchar(test.rune)
		if got != test.want {

	indexShift   = 3
	xorBit       = 0x4    // interpret the index as an xor pattern
	inlineXOR    = 0xE000 // These bits are set if the XOR pattern is inlined.

	joinShift = 8
	joinMask  = 0x07

	// Attributes
	attributesMask = 0x1800
	viramaModifier = 0x1800
	modifier       = 0x1000
	rtl            = 0x0800

	mayNeedNorm = 0x2000
)

// A category corresponds to a category defined in the IDNA mapping table.

import (
	"internal/filepathlite"
	"syscall"
	"time"
)

// These constants aren't in the syscall package, which is frozen.
// Values taken from golang.org/x/sys/unix.
const (
	_S_IFNAM  = 0x5000
	_S_IFDOOR = 0xd000
	_S_IFPORT = 0xe000
)

func fillFileStatFromSys(fs *fileStat, name string) {
	fs.name = filepathlite.Base(name)
	fs.size = fs.sys.Size
	fs.modTime = time.Unix(fs.sys.Mtim.Unix())

	IMAGE_FILE_BYTES_REVERSED_LO       = 0x0080
	IMAGE_FILE_32BIT_MACHINE           = 0x0100
	IMAGE_FILE_DEBUG_STRIPPED          = 0x0200
	IMAGE_FILE_REMOVABLE_RUN_FROM_SWAP = 0x0400
	IMAGE_FILE_NET_RUN_FROM_SWAP       = 0x0800
	IMAGE_FILE_SYSTEM                  = 0x1000
	IMAGE_FILE_DLL                     = 0x2000
	IMAGE_FILE_UP_SYSTEM_ONLY          = 0x4000
	IMAGE_FILE_BYTES_REVERSED_HI       = 0x8000
)

// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

package unix

import "syscall"

const (
	AT_EACCESS          = 0x100
	AT_FDCWD            = -0x64
	AT_REMOVEDIR        = 0x800
	AT_SYMLINK_NOFOLLOW = 0x200

	UTIME_OMIT = -0x2

	unlinkatTrap       uintptr = syscall.SYS_UNLINKAT
	openatTrap         uintptr = syscall.SYS_OPENAT