[Bug libstdc++/115846] std::optional> is constant expression even in C++20 mode

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

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=115846

--- Comment #4 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
(In reply to Andrew Pinski from comment #2)
> My reading of the paper makes me think this is a libc++ bug

And Microsoft's STD libc++ too.