New submission from Benjamin Peterson:

As seen by ubsan:
../cpython/Objects/call.c:858:9: runtime error: null pointer passed as argument 
2, which is declared to never be null

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messages: 301283
nosy: benjamin.peterson
priority: normal
severity: normal
status: open
title: possible undefined behavior in _PyObject_FastCall_Prepend
versions: Python 3.6, Python 3.7

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue31347>
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