[issue2235] __eq__ / __hash__ check doesn't take inheritance into account

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc added the comment:

The attached patch reverts r59576 and the part of r59106 about the
tp_hash slot.

It also adds the py3k warning::
   type defines __eq__ but not __hash__, and will not be hashable in 3.x
printed when calling hash() on such an object.

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keywords: +patch
Added file: http://bugs.python.org/file9607/inherit_hash.patch

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