http://gcc.gnu.org/bugzilla/show_bug.cgi?id=50075
--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-08-13 14:00:45 UTC --- obviously it shouldn't crash, but what you're trying won't work, because initializer_list::size is not constexpr, so il.size() is not a constant expression
