How to tell for which object attribute pickle fails?

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You could file a bug against Python for not including more helpful error messages. In the meantime, modify the _reduce_ex() function in copy_reg.py.

if base is self.__class__:
    print self # new   
    raise TypeError, "can't pickle %s objects" % base.__name__

Output:

<bound method ?.test_func of <__main__.Test object at 0xb7f4230c>>
Traceback (most recent call last):
  File "nopickle.py", line 14, in ?
    pickle.dumps(test)
  File "/usr/lib/python2.4/copy_reg.py", line 69, in _reduce_ex
    raise TypeError, "can't pickle %s objects" % base.__name__
TypeError: can't pickle instancemethod objects

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