[Bug c++/51213] [C++11][DR 1170] Access control checking has to be done under SFINAE conditions

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51213

--- Comment #17 from Paolo Carlini <paolo.carlini at oracle dot com> ---
But this example works in mainline (would be 4.9.0) and I don't think it's a
regression.