[issue3100] weakref subclass segfault

[Adam Olsen]

Adam Olsen <rhamph at gmail.com> added the comment:

Patch to add extra sanity checks to Py_INCREF (only if Py_DEBUG is set).
 If the refcount is 0 or negative if calls Py_FatalError.  This should
catch revival bugs such as this one a little more clearly.

The patch also adds a little more checking to _Py_ForgetReference, so
it's more likely to print an error rather than segfaulting.

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keywords: +patch
Added file: http://bugs.python.org/file10614/python-incref-from-zero.diff

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