$ rm build/lib.linux-x86_64-3.0-pydebug/_pickle.so
$ ./python Lib/test/regrtest.py -R:: test_pickle
test_pickle
test test_pickle failed -- Traceback (most recent call last):
  File "/home/heimes/dev/python/py3k/Lib/test/pickletester.py", line
1032, in test_bad_init
    self.assertRaises(pickle.PicklingError, BadPickler().dump, 0)
  File "/home/heimes/dev/python/py3k/Lib/unittest.py", line 311, in
failUnlessRaises
    callableObj(*args, **kwargs)
  File "/home/heimes/dev/python/py3k/Lib/pickle.py", line 225, in dump
    if self.proto >= 2:
AttributeError: 'BadPickler' object has no attribute 'proto'

1 test failed:
    test_pickle
[59279 refs]

The test could be skipped for the pure-python version of pickle: after 
all, it just tests that the interpreter does not segfault...
A simpler change is to change the expected exception into "Exception".

I think the best way to fix this is to add sanity checks similar to the
ones in _pickle. The checks are obviously useless in pickle.py, but I
think it is simpler than to try to skip tests, and it gives a nicer
error message to people who forget to call __init__ when subclassing.

Committed in r67940.