[Bug c++/109623] constexpr restrictions are not relaxed enough

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109623

--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
// PR c++/109623

struct U {
  U() { }
};

struct S {
  constexpr S() = default;
  U u;
};