[issue11321] 9th import of module _pickle always crashes

[Andreas Stührk]

Andreas Stührk <andy-python at hammerhartes.de> added the comment:

It's because the _pickle module doesn't incref Pickler_Type and Unpickler_Type before calling `PyModule_AddObject()` (which steals a reference).

The attached patch fixes the issue.

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keywords: +patch
nosy: +Trundle
Added file: http://bugs.python.org/file20931/issue11321.patch

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