{FloatLit, "0b1e10", "0b1e10", "'e' exponent requires decimal mantissa"},
		{FloatLit, "0b1P-1", "0b1P-1", "'P' exponent requires hexadecimal mantissa"},

		{ImagLit, "0b10i", "0b10i", ""},
		{ImagLit, "0b10.0i", "0b10.0i", "invalid radix point in binary literal"},

		// octals
		{IntLit, "0o0", "0o0", ""},
		{IntLit, "0o1234", "0o1234", ""},
		{IntLit, "0O1234", "0O1234", ""},

		{token.FLOAT, "0b1e10", "0b1e10", "'e' exponent requires decimal mantissa"},
		{token.FLOAT, "0b1P-1", "0b1P-1", "'P' exponent requires hexadecimal mantissa"},

		{token.IMAG, "0b10i", "0b10i", ""},
		{token.IMAG, "0b10.0i", "0b10.0i", "invalid radix point in binary literal"},

		// octals
		{token.INT, "0o0", "0o0", ""},
		{token.INT, "0o1234", "0o1234", ""},
		{token.INT, "0O1234", "0O1234", ""},

	assert(0x_cafei == complex(0, 0xcafe))

	// octals
	assert(0o_1 == 01)
	assert(0o12 == 012)
	assert(0o_1_2 == 012)
	assert(0o_1_2i == complex(0, 0o12))

	// binaries
	assert(0b_1 == 1)
	assert(0b10 == 2)
	assert(0b_1_0 == 2)
	assert(0b_1_0i == complex(0, 2))

	// decimal floats
	assert(0. == 0.0)
	assert(.0 == 0.0)
	assert(1_0. == 10.0)
	assert(.0_1 == 0.01)
	assert(1_0.0_1 == 10.01)

	{"01777777777777777777778", 0, 0, ErrSyntax},
	{"02000000000000000000000", 0, 1<<64 - 1, ErrRange},
	{"0200000000000000000000", 0, 1 << 61, nil},
	{"0b", 0, 0, ErrSyntax},
	{"0B", 0, 0, ErrSyntax},
	{"0b101", 0, 5, nil},
	{"0B101", 0, 5, nil},
	{"0o", 0, 0, ErrSyntax},
	{"0O", 0, 0, ErrSyntax},
	{"0o377", 0, 255, nil},
	{"0O377", 0, 255, nil},

	// underscores allowed with base == 0 only

	{"+0", "0", 0, 0, true},
	{"-0", "0", 0, 0, true},
	{"10", "10", 0, 10, true},
	{"10", "10", 10, 10, true},
	{"10", "10", 16, 16, true},
	{"-10", "-10", 16, -16, true},
	{"+10", "10", 16, 16, true},
	{"0b10", "2", 0, 2, true},
	{"0o10", "8", 0, 8, true},
	{"0x10", "16", 0, 16, true},
	{in: "0x10", base: 16},
	{"-0x10", "-16", 0, -16, true},
	{"+0x10", "16", 0, 16, true},
	{"00", "0", 0, 0, true},
	{"0", "0", 8, 0, true},

	if pp != nil {
		// Overflow records in profBuf have all header values set to zero. Make
		// sure that real headers have at least one bit set.
		hdr[0] = uint64(pp.id)<<1 | 0b1
	} else {
		hdr[0] = 0b10
	}
	if gp != nil {
		hdr[1] = gp.goid
	}
	hdr[2] = uint64(mp.procid)

	// Allow only one writer at a time
	for !trace.signalLock.CompareAndSwap(0, 1) {

		}
	}
}

// Test to use BLSI, if available
func TestBLSI(t *testing.T) {
	for _, tt := range []struct {
		x, want uint64
	}{
		{0b00001111, 0b001},
		{0b00001110, 0b010},
		{0b00001100, 0b100},
		{0b11000110, 0b010},
		{0b00000000, 0b000},
	} {
		if got := tt.x & -tt.x; got != tt.want {
			t.Errorf("%#x & (-%#x) = %#x, want %#x", tt.x, tt.x, got, tt.want)
		}

	case Complex128:
		return a.assignFloatN(offset, 8, 2)
	case String:
		return a.assignIntN(offset, goarch.PtrSize, 2, 0b01)
	case Interface:
		return a.assignIntN(offset, goarch.PtrSize, 2, 0b10)
	case Slice:
		return a.assignIntN(offset, goarch.PtrSize, 3, 0b001)
	case Array:
		tt := (*arrayType)(unsafe.Pointer(t))
		switch tt.Len {
		case 0:
			// There's nothing to assign, so don't modify

  // begin: should be (0, -1, 0) or (-1, 0, 0) if it's time-majored.
  // new_axis_mask: should always be 0.
  // ellipsis_mask: should always be 0.
  // begin_mask & end_mask: should be 0b101 = 5 or 0b110 = 4 if it's
  // time-majored. shrink_axis_mask: should be 0b010 = 2 or 0b001 = 1 if it's
  // time-majored.
  SmallVector<int64_t, 2> last_output_shape({batch, n_output});

	// Numbers
	{"decimal", "{{print 1234}}", "1234", tVal, true},
	{"decimal _", "{{print 12_34}}", "1234", tVal, true},
	{"binary", "{{print 0b101}}", "5", tVal, true},
	{"binary _", "{{print 0b_1_0_1}}", "5", tVal, true},
	{"BINARY", "{{print 0B101}}", "5", tVal, true},
	{"octal0", "{{print 0377}}", "255", tVal, true},
	{"octal", "{{print 0o377}}", "255", tVal, true},