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Hi Amaury, thanks for your work on this. I applied your patch and looked
at the code but there seem to be some issues left still.
(1) I don't think you need to add a warning to classic classes that
define __eq__ without __hash__ -- these aren't hashable and never were.
 The problem is purely with new classes AFAICT.
(2) I can't seen to trigger the warning for new classes (and yes, I
specified -3 on the command line :-):
>>> class C(object):
... def __eq__(self, other): return False
...
>>> hash(C())
-134976284
(3) test_Hashable in test_collections.py fails. This is because the
Hashable class believes that list, set, and dict are hashable. 
Something odd is going on:
>>> list.__hash__([])
-135100116
but
>>> hash([])
Traceback (most recent call last):
 File "<stdin>", line 1, in <module>
TypeError: unhashable type: 'list'
Note that in 2.5, both raise TypeError.