http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58191
--- Comment #8 from Paolo Carlini <paolo.carlini at oracle dot com> --- Thanks everybody. Lower priority wrt regressions, I agree we could do even better here, just bailing out for input iterators would be Ok with me too (wouldn't be the first time we do that), but anything that suits you and our debug-mode expert Francois is basically Ok with me. Thanks again.