}
}

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)
		}
	}

	{"0xabc", 12},
	{"0x8000", 16},
	{"0x80000000", 32},
	{"0x800000000000", 48},
	{"0x8000000000000000", 64},
	{"0x80000000000000000000", 80},
	{"-0x4000000000000000000000", 87},
}

func TestBitLen(t *testing.T) {
	for i, test := range bitLenTests {
		x, ok := new(Int).SetString(test.in, 0)
		if !ok {
			t.Errorf("#%d test input invalid: %s", i, test.in)
			continue
		}