t.Errorf("inconsistent max: got %d, want %d", got.Max(), want.Max())
	}
	if got.End() != want.End() {
		t.Errorf("inconsistent end: got %d, want %d", got.End(), want.End())
	}
}

func TestMallocBitsPopcntRange(t *testing.T) {
	type test struct {
		i, n uint // bit range to popcnt over.
		want uint // expected popcnt result on that range.
	}
	tests := map[string]struct {