{"\uFFFD hello \uFFFD world", `"\xef\xbf\xbd hello \xef\xbf\xbd world"`}, // utf8.RuneError
	// overflow
	{"9223372036854775810ns", `"9223372036854775810ns"`},
	{"9223372036854775808ns", `"9223372036854775808ns"`},
	{"-9223372036854775809ns", `"-9223372036854775809ns"`},
	{"9223372036854776us", `"9223372036854776us"`},
	{"3000000h", `"3000000h"`},
	{"9223372036854775.808us", `"9223372036854775.808us"`},

	itd64{a: -9223372036854775808, b: 0, add: -9223372036854775808, sub: -9223372036854775808, mul: 0},
	itd64{a: -9223372036854775808, b: 1, add: -9223372036854775807, sub: 9223372036854775807, mul: -9223372036854775808, div: -9223372036854775808, mod: 0},
	itd64{a: -9223372036854775808, b: 4294967296, add: -9223372032559808512, sub: 9223372032559808512, mul: 0, div: -2147483648, mod: 0},

-9223372036854775808 false
done
-9223372036854775807 false
-9223372036854775808 false
done
-9223372036854775806 false
-9223372036854775808 false

pkg math (darwin-amd64), const MaxUint = 18446744073709551615
pkg math (darwin-amd64), const MinInt = -9223372036854775808
pkg math (darwin-amd64-cgo), const MaxInt = 9223372036854775807
pkg math (darwin-amd64-cgo), const MaxUint = 18446744073709551615
pkg math (darwin-amd64-cgo), const MinInt = -9223372036854775808
pkg math (darwin-arm64), const MaxInt = 9223372036854775807
pkg math (darwin-arm64), const MaxUint = 18446744073709551615

	test_int64{fn: sub_int64_Neg1, fnname: "sub_int64_Neg1", in: 9223372036854775807, want: -9223372036854775808},
	test_int64{fn: sub_0_int64, fnname: "sub_0_int64", in: -9223372036854775808, want: -9223372036854775808},
	test_int64{fn: sub_int64_0, fnname: "sub_int64_0", in: -9223372036854775808, want: -9223372036854775808},

	return a << big
}

func main() {
	f(1)
}

/*
main·f: doasm: notfound from=75 to=13 (82)    SHLQ    $-9223372036854775808,BX
main·f: doasm: notfound from=75 to=13 (82)    SHLQ    $-9223372036854775808,BX
main·f: doasm: notfound from=75 to=13 (82)    SHLQ    $-9223372036854775808,BX

		// Bad numeric inputs.
		{"9223372036854775808", 0, false},
		{"9223372036854775809", 0, false},
		{"18446744073709551615", 0, false},
		{"20496382327982653440", 0, false},
		{"18446744073709551616", 0, false},
		{"18446744073709551617", 0, false},
		{"9999999999999999999999", 0, false},

		// Bad trivial suffix inputs.
		{"9223372036854775808B", 0, false},
		{"9223372036854775809B", 0, false},

	}
	for range maxUint /* ERROR "cannot use maxUint (untyped int constant 18446744073709551615) as int value in range clause (overflows)" */ {
	}

	for i := range maxInt {
		_ = i
	}
	for i := range maxInt /* ERROR "cannot use maxInt + 1 (untyped int constant 9223372036854775808) as int value in range clause (overflows)" */ + 1 {

			Data: int64(math.MaxInt64),
			Out:  `9223372036854775807`,
		},
		{
			In:   `-9223372036854775808`,
			Data: int64(math.MinInt64),
			Out:  `-9223372036854775808`,
		},

		// Int overflow
		{
			In:   `9223372036854775808`, // MaxInt64 + 1
			Data: float64(9223372036854775808),
			Out:  `9223372036854776000`,
		},
		{
			In:   `-9223372036854775809`, // MinInt64 - 1

		t.Errorf("-9223372036854775808 %s -4294967296 = %d, want 2147483648", "/", r)
	}
	y = -1
	r = x / y
	if r != -9223372036854775808 {
		t.Errorf("-9223372036854775808 %s -1 = %d, want -9223372036854775808", "/", r)
	}
	y = 1
	r = x / y
	if r != -9223372036854775808 {
		t.Errorf("-9223372036854775808 %s 1 = %d, want -9223372036854775808", "/", r)
	}
	y = 4294967296
	r = x / y