var (
	osreldateOnce sync.Once
	osreldate     uint32
)

// First __DragonFly_version after September 2019 ABI changes
// http://lists.dragonflybsd.org/pipermail/users/2019-September/358280.html
const _dragonflyABIChangeVersion = 500705

func supportsABI(ver uint32) bool {
	osreldateOnce.Do(func() { osreldate, _ = SysctlUint32("kern.osreldate") })

}

func TestReleaseTagToNFromTimeConversion(t *testing.T) {
	utcLoc, _ := time.LoadLocation("")
	testCases := []struct {
		t      time.Time
		tag    string
		errStr string
	}{
		{
			time.Date(2017, time.September, 29, 19, 16, 56, 0, utcLoc),
			"RELEASE.2017-09-29T19-16-56Z", "",
		},
		{
			time.Date(2017, time.August, 5, 0, 0, 53, 0, utcLoc),
			"RELEASE.2017-08-05T00-00-53Z", "",
		},
		{

Build time:   2020-06-02 20:46:21 UTC
Revision:     a27f41e4ae5e8a41ab9b19f8dd6d86d7b384dad4

Kotlin:       1.3.72
Groovy:       2.5.11
Ant:          Apache Ant(TM) version 1.10.7 compiled on September 1 2019
JVM:          14 (AdoptOpenJDK 14+36)
OS:           Mac OS X 10.15.2 x86_64
----

If not, here are some things you might see instead.

=== Command not found: gradle

	fmt.Println(time.Unix(1e9, 0).UTC())     // 1e9 seconds
	fmt.Println(time.Unix(0, 1e18).UTC())    // 1e18 nanoseconds
	fmt.Println(time.Unix(2e9, -1e18).UTC()) // 2e9 seconds - 1e18 nanoseconds

	t := time.Date(2001, time.September, 9, 1, 46, 40, 0, time.UTC)
	fmt.Println(t.Unix())     // seconds since 1970
	fmt.Println(t.UnixNano()) // nanoseconds since 1970

	// Output:
	// 2001-09-09 01:46:40 +0000 UTC
	// 2001-09-09 01:46:40 +0000 UTC

// while the recursive call using m2 will use expNNMontgomery.
// For more details, see Ç. K. Koç, “Montgomery Reduction with Even Modulus”,
// IEE Proceedings: Computers and Digital Techniques, 141(5) 314-316, September 1994.
// http://www.people.vcu.edu/~jwang3/CMSC691/j34monex.pdf
func (z nat) expNNMontgomeryEven(x, y, m nat) nat {
	// Split m = m₁ × m₂ where m₁ = 2ⁿ
	n := m.trailingZeroBits()
	m1 := nat(nil).shl(natOne, n)