}
}

var bitLenTests = []struct {
	val  int64
	want int
}{
	{0, 0},
	{1, 1},
	{-16, 5},
	{1 << 61, 62},
	{1 << 62, 63},
	{-1 << 62, 63},
	{-1 << 63, 64},
}

func TestBitLen(t *testing.T) {
	for _, test := range bitLenTests {
		if got := BitLen(MakeInt64(test.val)); got != test.want {
			t.Errorf("%v: got %v, want %v", test.val, got, test.want)
		}
	}