namespace bits {
template<class T, long long N, long long... M>
struct make_integer_sequence :
- public make_integer_sequence<T, N-1, N-1, M...>
+ make_integer_sequence<T, N-1, N-1, M...>
{};
template<class T, long long... M>
struct make_integer_sequence<T, 0, M...> {