[issue36379] nb_inplace_pow is always called with an invalid argument

[Zuzu_Typ]

New submission from Zuzu_Typ <zuzu.typ at gmail.com>:

Using the C-API, the inplace_pow numbermethod is always called with the third argument pointing to an invalid address.

The reason is likely that self.__ipow__ only takes one argument, resulting in a binaryfunc (self, arg), though inplace_pow is a ternaryfunc.
When trying to use the third argument in any way, Python crashes.

The third arg should be nonexistent, NULL or Py_None.

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components: Build, Extension Modules
messages: 338458
nosy: Zuzu_Typ
priority: normal
severity: normal
status: open
title: nb_inplace_pow is always called with an invalid argument
type: crash
versions: Python 2.7, Python 3.7

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue36379>
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