http://gcc.gnu.org/bugzilla/show_bug.cgi?id=45114
--- Comment #9 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-10-27 22:27:35 UTC --- I don't have any self-contained tests but there are a number of TODOs in libstdc++ which indicate places that should use a template alias when available - I'll try the patch and revisit those TODOs