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

[paolo.carlini at oracle dot com]

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

--- Comment #2 from Paolo Carlini <paolo.carlini at oracle dot com> 2011-11-30 
19:22:32 UTC ---
Yes, should be pretty trivial given the infrastructure already in place. In
semantics should be just matter of calling CLASS_TYPE_P && CLASSTYPE_FINAL