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

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

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

--- Comment #13 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Matthias Wippich observed that ^^typename std::int64_t works.