https://gcc.gnu.org/bugzilla/show_bug.cgi?id=92570
Ville Voutilainen <ville.voutilainen at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|ASSIGNED |RESOLVED
Resolution|--- |INVALID
--- Comment #3 from Ville Voutilainen <ville.voutilainen at gmail dot com> ---
This is http://www.open-std.org/jtc1/sc22/wg21/docs/papers/2017/p0641r2.html
which clang implements only in c++2a mode, because those core issues were never
explicitly marked DR. We could almost fix this on the library side by removing
the =default from _Optional_payload_base, but _Optional_payload would still run
into this problem. This is not worth library heroics.
