if s.ch < 0 {
				msg = "escape sequence not terminated"
			}
			s.error(s.offset, msg)
			return false
		}
		x = x*base + d
		s.next()
		n--
	}

	if x > max || 0xD800 <= x && x < 0xE000 {
		s.error(offs, "escape sequence is invalid Unicode code point")
		return false
	}

	return true
}

func (s *Scanner) scanRune() string {
	// '\'' opening already consumed

			t.Fatalf("input %d synerr.Msg wrong: want %q, got %q", i, tt.err, synerr.Msg)
		}
	}
}

func TestIsInCharacterRange(t *testing.T) {
	invalid := []rune{
		utf8.MaxRune + 1,
		0xD800, // surrogate min
		0xDFFF, // surrogate max
		-1,
	}
	for _, r := range invalid {
		if isInCharacterRange(r) {
			t.Errorf("rune %U considered valid", r)
		}
	}
}

		{"☻x\xe2\x98�", '�', len("☻x")},
		{"☻x\xe2\x98x", '�', len("☻x")},

		// Invalid rune values should never match.
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
	}
	for _, tt := range tests {
		if got := IndexRune(tt.in, tt.rune); got != tt.want {

		{0x31f0, 0x31ff, 1},
		{0x3400, 0x4dbf, 1},
		{0x4e00, 0xa014, 1},
		{0xa016, 0xa48c, 1},
		{0xa4d0, 0xa4f7, 1},
		{0xa500, 0xa60b, 1},
		{0xa610, 0xa61f, 1},
		{0xa62a, 0xa62b, 1},
		{0xa66e, 0xa6a0, 50},
		{0xa6a1, 0xa6e5, 1},
		{0xa78f, 0xa7f7, 104},
		{0xa7fb, 0xa801, 1},
		{0xa803, 0xa805, 1},
		{0xa807, 0xa80a, 1},
		{0xa80c, 0xa822, 1},
		{0xa840, 0xa873, 1},
		{0xa882, 0xa8b3, 1},

		{"☻x\xe2\x98�", '�', len("☻x")},
		{"☻x\xe2\x98x", '�', len("☻x")},

		// Invalid rune values should never match.
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", -1, -1},
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", 0xD800, -1}, // Surrogate pair
		{"a☺b☻c☹d\xe2\x98�\xff�\xed\xa0\x80", utf8.MaxRune + 1, -1},
	}
	for _, tt := range tests {
		if got := IndexRune([]byte(tt.in), tt.rune); got != tt.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.

	BOTHER                           = 0x1000
	BS1                              = 0x2000
	BSDLY                            = 0x2000
	CBAUD                            = 0x100f
	CBAUDEX                          = 0x1000
	CIBAUD                           = 0x100f0000
	CLOCAL                           = 0x800
	CR1                              = 0x200
	CR2                              = 0x400
	CR3                              = 0x600

	BOTHER                           = 0x1000
	BS1                              = 0x2000
	BSDLY                            = 0x2000
	CBAUD                            = 0x100f
	CBAUDEX                          = 0x1000
	CIBAUD                           = 0x100f0000
	CLOCAL                           = 0x800
	CR1                              = 0x200
	CR2                              = 0x400
	CR3                              = 0x600

	BOTHER                           = 0x1000
	BS1                              = 0x2000
	BSDLY                            = 0x2000
	CBAUD                            = 0x100f
	CBAUDEX                          = 0x1000
	CIBAUD                           = 0x100f0000
	CLOCAL                           = 0x800
	CR1                              = 0x200
	CR2                              = 0x400
	CR3                              = 0x600

	MAP_ANONYMOUS                    = 0x800
	MAP_DENYWRITE                    = 0x2000
	MAP_EXECUTABLE                   = 0x4000
	MAP_GROWSDOWN                    = 0x1000
	MAP_HUGETLB                      = 0x80000
	MAP_LOCKED                       = 0x8000
	MAP_NONBLOCK                     = 0x20000
	MAP_NORESERVE                    = 0x400
	MAP_POPULATE                     = 0x10000