[issue3664] Pickler.dump from a badly initialized Pickler segfaults

[Barry A. Warsaw]

Barry A. Warsaw <barry at python.org> added the comment:

Rather than attach a full _pickle.c file, please generate a unified diff
with just your changes.  The patch should include a test for the
crashing condition.  If you can upload that I'll try to accept it for
rc3.  Deferring for now.

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nosy: +barry
priority: release blocker -> deferred blocker

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