http://gcc.gnu.org/bugzilla/show_bug.cgi?id=55043
--- Comment #27 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-01-16 10:52:57 UTC --- Actually, now that the unordered containers do not inherit from Hashtable it should be much easier to implement something like comment 17. When Daniel first suggested it I thought it would be tricky given the current design of the containers, but François changed them three days later. I'll revert today's patch and fix it properly by making __is_copy_insertable more accurate and removing the unordered container constructors when appropriate.
