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

[Amaury Forgeot d'Arc]

Amaury Forgeot d'Arc <amauryfa at gmail.com> added the comment:

Here is a new patch, all tests pass.
- no warning for classic classes
- added tests for -3 warnings

I had to add two TPSLOT entries to the slodefs list; can you please
check that this is correct (I wanted to reset tp_hash to NULL when
__eq__ or __cmp__ are defined).

Added file: http://bugs.python.org/file10002/inherit_hash3.patch

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