https://gcc.gnu.org/bugzilla/show_bug.cgi?id=53660
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> --- I don't think this is a bug. GCC, ICC and clang all reject it the same way. MSV rejects it with: <source>(10): error C2783: 'c::operator enable_if<__formal>::t(void)': could not deduce template argument for 't'
