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From: "mpolacek at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
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Subject: [Bug c++/103480] [10/11/12 Regression] -Werror=useless-cast with
 constexpr destructor
Date: Tue, 30 Nov 2021 00:52:25 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D103480

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
Add typename to make it C++14:

namespace std {
template <typename _Tp, int _Nm> struct __array_traits {
  typedef _Tp _Type[_Nm];
};
template <typename _Tp, int _Nm> struct array {
  typename __array_traits<_Tp, _Nm>::_Type _M_elems;
};
} // namespace std
struct scope_guard {
  constexpr scope_guard(scope_guard &&) {}
  template <int count> static auto array(void()) {
    std::array<scope_guard, count> r;
    return r;
  }
  scope_guard() =3D default;
};
void test() { scope_guard::array<2>(test); }=