https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70472
TC <rs2740 at gmail dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |rs2740 at gmail dot com --- Comment #5 from TC <rs2740 at gmail dot com> --- In any event, it would be wrong to SFINAE on std::is_copy_constructible<value_type>. The requirement is CopyInsertable, not CopyConstructible. The allocator's construct() can mutilate the constructor arguments to its heart's content before passing them on, and I don't see a way to check this.