https://gcc.gnu.org/bugzilla/show_bug.cgi?id=62169
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- It's not an option IMHO. See http://www.stroustrup.com/SCARY.pdf for the benefits of the current design. Those benefits outweigh the advantage of having non-portable code diagnosed. Debug iterators can't be SCARY because they have a pointer back to their patent container so have to depend on the exact type.
