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I seem to be suffering from some unintentional consequences
of this fix.  I do not think that the pickle should fail in
the follwing case.  Wouldn't it be a better idea to just
check for a successful of the pickled class instead of
requiring the imported class to be stored at the same memory
location?

>>> import pickle, copy
>>> o = copy._EmptyClass()
>>> reload(copy)
<module 'copy' from '/usr/lib/python2.2/copy.pyc'>
>>> pickle.dumps(o, 1)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "/usr/lib/python2.2/pickle.py", line 978, in dumps
    Pickler(file, bin).dump(object)
  File "/usr/lib/python2.2/pickle.py", line 115, in dump
    self.save(object)
  File "/usr/lib/python2.2/pickle.py", line 225, in save
    f(self, object)
  File "/usr/lib/python2.2/pickle.py", line 477, in save_inst
    save(cls)
  File "/usr/lib/python2.2/pickle.py", line 225, in save
    f(self, object)
  File "/usr/lib/python2.2/pickle.py", line 524, in save_global
    raise PicklingError(
pickle.PicklingError: Can't pickle <class copy._EmptyClass
at 0x819493c>: it's not the same object as copy._EmptyClass