[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 #8 from Paolo Carlini <paolo.carlini at oracle dot com> 2012-05-14 13:12:38 UTC ---
Created attachment 27402
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27402
Draft

Something like this, very lightly tested so far.