[Bug c++/124447] [reflection] Unable to use reflection in the using statement

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=124447

--- Comment #14 from Jakub Jelinek <jakub at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #13)
> Matthias Wippich observed that ^^typename std::int64_t works.

Just note that is_type_alias (^^typename std::int64_t) will be false, ditto
is_type_alias (^^typename ::int64_t), but is_type_alias (^^int64_t) or
is_type_alias (^^::int64_t) will be true (if it will work at all).
And ^^typename int64_t will not work.