https://gcc.gnu.org/bugzilla/show_bug.cgi?id=90532
Jonathan Wakely <redi at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |NEW
Last reconfirmed| |2019-05-20
CC| |ville at gcc dot gnu.org
Component|libstdc++ |c++
Ever confirmed|0 |1
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
This is also a compiler bug. The only one of the four traits to give the right
answer is the one implemented purely in the library. The other three use the
__is_constructible or __is_trivially_constructible built-ins, which are wrong
for this case.
std::is_default_constructible should probably be using the built-in too, even
though that would make it wrong (but consistently so, and it would be right
after the built-in gets fixed).
