[Bug c++/102199] is_default_constructible incorrect for an inner type with NSDMI

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102199

--- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
This is because the following is still valid C++11:
struct outer {
    struct inner {
        // inner() { }
        unsigned int x = y;
    };
  static constexpr int y =10;
};

That is inner is not completed until outer is completed.