[Bug c++/58590] [C++11] Hidden typename not ill-formed under SFINAE conditions

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=58590

--- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> ---
I still believe this isn't a SFINAE proper issue. Also note that in the
original testcase main was *empty*.