Collin Winter <coll...@gmail.com> added the comment:

Interestingly, it only fails with protocol 0:

>>> v = ([],)
>>> v[0].append(v)
>>> import pickle,cPickle
>>> cPickle.loads(pickle.dumps(v, 0))
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
cPickle.UnpicklingError: unpickling stack underflow
>>> cPickle.loads(pickle.dumps(v, 1))
([([...],)],)
>>> cPickle.loads(pickle.dumps(v, 2))
([([...],)],)
>>>


I'll see if I can come up with a fix.

----------
assignee:  -> collinwinter

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5794>
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