[Bug libstdc++/87855] std::optional only copy-constructible if T is trivially copy-constructible

[ville.voutilainen at gmail dot com]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=87855

--- Comment #13 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
Well, Jonathan found this http://lists.isocpp.org/core/2018/06/4643.php