[Bug libstdc++/51365] cannot use final empty class in std::tuple

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=51365

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> 2011-11-30 
21:06:25 UTC ---
Created attachment 25961
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=25961
front end patch (missing docs and tests)