[Bug libstdc++/56613] [4.8 Regression] map::operator[](key_type&&) fails with custom allocator

[redi at gcc dot gnu.org]

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=56613

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> 2013-03-13 13:35:14 UTC ---
Oops, the program isn't quite valid C++03, I forgot these members of the
allocator:

  pointer       address(reference x) const throw()       { return &x; }
  const_pointer address(const_reference x) const throw() { return &x; }

That doesn't affect the issue though.