for i := 0; i <= 16; i++ {
		got := bits.Len16(1 << i)
		want := i + 1
		if want == 17 {
			want = 0
		}
		if got != want {
			t.Errorf("Len16(1<<%d) = %d, want %d", i, got, want)
		}
	}
}

func TestBitLen8(t *testing.T) {
	for i := 0; i <= 8; i++ {
		got := bits.Len8(1 << i)
		want := i + 1
		if want == 9 {
			want = 0
		}
		if got != want {
			t.Errorf("Len8(1<<%d) = %d, want %d", i, got, want)
		}
	}