[issue3100] weakref subclass segfault

[Amaury Forgeot d'Arc]

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

It seems enough to simply skip deleted weakrefs in PyObject_ClearWeakRefs.
Here is a tentative patch.

Added file: http://bugs.python.org/file10615/weakref_cycle.patch

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