[Bug c++/109876] [10/11/12/13/14 Regression] initializer_list not usable in constant expressions in a template

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109876

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
// PR c++/109876

using size_t = decltype(sizeof 0);

namespace std {
template <class> struct initializer_list {
  const int *_M_array;
  size_t _M_len;
  constexpr size_t size() const { return _M_len; }
};
} // namespace std

template <int> struct Array {};
template <int> void g()
{
  static constexpr std::initializer_list<int> num{2};
  Array<num.size()> ctx;
}