http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51213
--- Comment #4 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-04-27 09:26:39 UTC --- Yes, in a few areas the 4.7.x library is much closer to the letter of C++11 in terms of constraining, and of course we never did access control under sfinae. Note that the latter, being a new feature, is very likely to happen only in 4.8, but not in 4.7.x, I don't think however we may want to take out constraining from the 4.7.x library (indeed, people are normally encouraged to use deleted members, not access control, together with "classic" sfinae)
