https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70522
--- Comment #5 from Casey Carter <Casey at Carter dot net> --- (In reply to Jason Merrill from comment #4) > (In reply to Casey Carter from comment #2) > > This is a regression of sorts, FWIW, gcc 4.3 compiled it correctly > > (http://melpon.org/wandbox/permlink/Efjfvay0U5sZvZP8) back in the day. I > > assume that's not quite "regressive" enough for the 6 branch? > > I was thinking of putting it in anyway, but that definitely strengthens the > case. :) Clearly GCC6 MUST NOT SHIP until this critical bug - which has gone unnoticed for years - is fixed. I would suggest elevating to P0 if it wasn't already resolved ;)