[issue34543] _struct.Struct: calling functions without calling __init__ results in SystemError

[Irit Katriel]

Irit Katriel <iritkatriel at gmail.com> added the comment:

Reproduced on 3.11:

>>> from _struct import Struct
>>> s = Struct.__new__(Struct)
>>> s.unpack_from(b'asdf')
Assertion failed: (self->s_codes != NULL), function Struct_unpack_from_impl, file /Users/iritkatriel/src/cpython/Modules/_struct.c, line 1603.
zsh: abort      ./python.exe

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nosy: +iritkatriel
versions: +Python 3.10, Python 3.11 -Python 2.7, Python 3.7, Python 3.8

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue34543>
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