[Bug libstdc++/53339] unordered_map::iterator requires Value to be complete type

[paolo.carlini at oracle dot com]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=53339

--- Comment #7 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-05-14 10:59:15 UTC ---
I really do believe that we want to leave the stuff in stl_function.h alone and
have something very neat in namespace __detail, in hashtable_policy.h, probably
a single overloaded templated operator taking a && would be enough.