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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109876] [10/11/12/13/14 Regression] initializer_list not
 usable in constant expressions in a template
Date: Fri, 19 May 2023 21:01:35 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109876

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

using size_t =3D 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;
}=