[Bug libstdc++/102712] std::optional::operator* should assert on unset value

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=102712

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
(In reply to Jonathan Wakely from comment #1)
> Just compile with -D_GLIBCXX_ASSERTIONS

Or the more heavyweight -D_GLIBCXX_DEBUG which implies _GLIBCXX_ASSERTIONS too.