https://gcc.gnu.org/bugzilla/show_bug.cgi?id=104242
--- Comment #6 from CVS Commits <cvs-commit at gcc dot gnu.org> --- The releases/gcc-11 branch has been updated by Jonathan Wakely <r...@gcc.gnu.org>: https://gcc.gnu.org/g:5fc6b3a03355e1f77a7c38c0fa7afb0822ad954f commit r11-10870-g5fc6b3a03355e1f77a7c38c0fa7afb0822ad954f Author: Jonathan Wakely <jwak...@redhat.com> Date: Fri Mar 18 13:10:01 2022 +0000 libstdc++: Simplify constraints for std::any construction [PR104242] Partially revert r12-4190-g6da36b7d0e43b6f9281c65c19a025d4888a25b2d because using __and_<..., is_copy_constructible<T>> when T is incomplete results in an error about deriving from is_copy_constructible<T> when that is incomplete. I don't know how to fix that, so this simply restores the previous constraint which worked in this case (even though I think it's technically undefined to use is_copy_constructible<T> with incomplete T). This doesn't restore exactly what we had before, but uses the is_copy_constructible_v and __is_in_place_type_v variable templates instead of the ::value member. libstdc++-v3/ChangeLog: PR libstdc++/104242 * include/std/any (any(T&&)): Revert change to constraints. * testsuite/20_util/any/cons/104242.cc: New test. (cherry picked from commit 7a42b1fa1a090ead96cc0f94a8060a9650c810d5)
