[New-bugs-announce] [issue46891] Crash in ModuleType subclass with __slots__

[Ronald Oussoren]

New submission from Ronald Oussoren <ronaldoussoren at mac.com>:

The following crashes the interpreter in Python 3.11, and works fine in older versions:

# --- script.py 
import types

class MyModule (types.ModuleType):
    __slots__ = (
        "_MyModule__a",
        "_MyModule__b",
    )

    def __init__(self, name):
        super().__init__(name)

m = MyModule("name")
# -- end of file

The key in this is the ``__slots__`` definition: The script does not crash without ``__slots__``, or with a slots tuple with 1 item.

This is a reproducer based on code in PyObjC.

----------
components: Interpreter Core
keywords: 3.11regression
messages: 414294
nosy: ronaldoussoren
priority: normal
severity: normal
stage: needs patch
status: open
title: Crash in ModuleType subclass with __slots__
type: crash
versions: Python 3.11

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue46891>
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