[Bug c++/48934] no rejection reason given for SFINAE

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=48934

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-05-09 
12:18:12 UTC ---
That patch makes no difference for the example in this PR