[issue4170] segfault with defaultdict and pickle

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

The pickle protocol should also check that __reduce__ returns iterators
(iterables are not enough).
The code below crashes the interpreter (twice ;-)

class C:
    def __reduce__(self):
        return C, (), None, None, []
class D:
    def __reduce__(self):
        return D, (), None, [], None
import pickle
pickle.dumps(C())
pickle.dumps(D())

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nosy: +amaury.forgeotdarc

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<http://bugs.python.org/issue4170>
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