https://gcc.gnu.org/bugzilla/show_bug.cgi?id=66742
--- Comment #9 from TC <rs2740 at gmail dot com> --- The ugly fix in Comment #6 should be performant, if, well, ugly. It may be worth considering holding the nodes via a different type. There's no real reason why the temporary holders need to be a `list` or have a copy of the allocator as long as we make sure that everything in there is spliced back into *this when we exit sort() (by exception or normal return). Speaking of exceptions, merge() appears to have exception safety problems. I'll file a separate bug.
