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

[eltoder at gmail dot com]

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

--- Comment #5 from Eugene Toder <eltoder at gmail dot com> 2012-05-14 05:05:58 UTC ---
Created attachment 27396
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=27396
Another approach

Actually, a much simpler and cleaner change might be along these lines.