https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66256
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Benjamin Buch from comment #3)
> Same with decltype instead of noexcept:
>
>
> struct test{
> // it only works if e is declared before test()
> using type = decltype(e);
> static const bool e = false;
> };
This code is not valid, GCC is correct to give an error.
