Amaury Forgeot d'Arc added the comment:

The patch is incomplete: the VISIT macro contains a "return 0;" and in this 
case st->recursion_depth is not decremented.
OTOH errors are never caught, so it's not necessary to do any cleanup in case 
of errors.
Here is a simplified patch.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue5765>
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