itd64{a: -9223372036854775807, b: -1, add: -9223372036854775808, sub: -9223372036854775806, mul: 9223372036854775807, div: 9223372036854775807, mod: 0},
	itd64{a: -9223372036854775807, b: 0, add: -9223372036854775807, sub: -9223372036854775807, mul: 0},
	itd64{a: -9223372036854775807, b: 1, add: -9223372036854775806, sub: -9223372036854775808, mul: -9223372036854775807, div: -9223372036854775807, mod: 0},

	test_int64{fn: add_0_int64, fnname: "add_0_int64", in: 9223372036854775807, want: 9223372036854775807},
	test_int64{fn: add_int64_0, fnname: "add_int64_0", in: 9223372036854775807, want: 9223372036854775807},
	test_int64{fn: add_1_int64, fnname: "add_1_int64", in: -9223372036854775808, want: -9223372036854775807},
	test_int64{fn: add_int64_1, fnname: "add_int64_1", in: -9223372036854775808, want: -9223372036854775807},

9223372036854775807 false
done
9223372036854775806 false
9223372036854775807 false
done
9223372036854775805 false
9223372036854775807 false
done

pkg io/fs, func FileInfoToDirEntry(FileInfo) DirEntry
pkg math (darwin-amd64), const MaxInt = 9223372036854775807
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

	}
	y = 9223372036854775807
	r = x + y
	if r != 9223372036854775807 {
		t.Errorf("0 %s 9223372036854775807 = %d, want 9223372036854775807", "+", r)
	}
	x = 1
	y = -9223372036854775808
	r = x + y
	if r != -9223372036854775807 {
		t.Errorf("1 %s -9223372036854775808 = %d, want -9223372036854775807", "+", r)
	}
	y = -9223372036854775807
	r = x + y
	if r != -9223372036854775806 {

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

	tests := []struct {
		name string
		in   interface{}
		out  string
	}{
		{"int", math.MaxInt64, "9223372036854775807"},
		{"int8", int8(math.MaxInt8), "127"},
		{"int16", int16(math.MaxInt16), "32767"},
		{"int32", int32(math.MaxInt32), "2147483647"},
		{"int64", int64(math.MaxInt64), "9223372036854775807"},
		{"uint", uint(math.MaxUint64), "18446744073709551615"},
		{"uint8", uint8(math.MaxUint8), "255"},

	assert(i23 == (1<<31)-1, "i23 size")

	// int64
	var i30 int64 = 0
	var i31 int64 = 1
	var i32 int64 = -1
	var i33 int64 = 9223372036854775807
	var i34 int64 = -9223372036854775807
	var i35 int64 = -9223372036854775808
	var i36 int64 = +9223372036854775807
	assert(i31 == i30+1, "i31")
	assert(i32 == -i31, "i32")
	assert(i33 == -i34, "i33")
	assert(-(i35+1) == i36, "i35")
	assert(i33 == (1<<63)-1, "i33 size")

	int64(183731176326946086),  // Int64N(1000000000000000000)
	int64(680987186633600239),  // Int64N(1152921504606846976)
	int64(4102454148908803108), // Int64N(9223372036854775806)
	int64(8679174511200971228), // Int64N(9223372036854775807)
	int64(0),                   // Int64N(1)
	int64(3),                   // Int64N(10)
	int64(27),                  // Int64N(32)
	int64(665831),              // Int64N(1048576)

	{"a#02", "x/a#02#01"}, // We already used a#02 once, so add a suffix.

	{"b#00", "x/b#00"},
	{"b", "x/b"}, // Implicit 0 doesn't conflict with explicit "#00".
	{"b", "x/b#01"},
	{"b#9223372036854775807", "x/b#9223372036854775807"}, // MaxInt64
	{"b", "x/b#02"},
	{"b", "x/b#03"},

	// Sanitizing
	{"A:1 B:2", "x/A:1_B:2"},
	{"s\t\r\u00a0", "x/s___"},
	{"\x01", `x/\x01`},
	{"\U0010ffff", `x/\U0010ffff`},
}