http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56257
--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-02-09 02:01:21 UTC --- To be specific, of course using a name like _M_impl doesn't lead to portable code ... that's kinda the point of reserved names. We use them for our own purposes, any purposes we want, and programs that use them are inherently non-portable.
