[issue2702] pickling of large recursive structures crashes cPickle

[Amaury Forgeot d'Arc]

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

Another version of the patch, that removes the self->nesting member and
uses the Py_EnterRecursiveCall machinery.
I prefer it because it takes into account the depth of the current
python call stack.

Added file: http://bugs.python.org/file10738/cpickle2.patch

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