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In the attached test_exception_pickle.py file, class C and D cannot be
unpickled (raises TypeError).
class C(Exception):
 """Extension with values, args not set."""
 def __init__(self, foo):
 self.foo = foo
class D(Exception):
 """Extension with values, init called with no args."""
 def __init__(self, foo):
 self.foo = foo
 Exception.__init__(self)
There are also some other exceptions that fail to be handled properly. 
See the exception_pickling_26.diff for some unittests. In particular, I
see SlotedNaiveException failing.