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// PR c++/63849
// { dg-do compile { target c++11 } }
template <class _T, class...>
using First = _T; // we should not use this
// alias with only
// one pack parameter (?)
template <template <class...> class _Successor,
int,
class... _Xs>
struct Overlay
{
using O = _Successor<_Xs...>;
};
template <class... _Pack>
struct List
{
template <int _s>
using O = typename Overlay<List, _s, _Pack...>::O;
template <template <class...> class _S>
using Pass = _S<_Pack...>;
template <int _i>
using At = typename O<_i>
::template Pass<First>;
};
template <int _i>
using At = typename List<int, char>
::template At<_i>;
template <int _i>
void func_crash(At<_i>&) {}
int main(int argc, char *argv[])
{
char ccc;
int iii;
func_crash<0>(iii);
}
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