Bug report

Bug description:

I noticed a behavioral difference between the (async) with statement and(Async)ExitStack. The with statement correctly recognizes context manager methods (__enter__,__exit__,__aenter__, and__aexit__) even when they are defined via__slots__, whereas(Async)ExitStack does not.

classSlotsCM:__slots__= ("__enter__","__exit__", )def__init__(self):self.__enter__=self.__exit__=lambda*__:None# This workswithSlotsCM():pass# This doesn't.fromcontextllibimportExitStackwithExitStack()asstack:stack.enter_context(SlotsCM())

Traceback (most recent call last):  File "xxxx.py", line 16, in <module>    stack.enter_context(SlotsCM())    ~~~~~~~~~~~~~~~~~~~^^^^^^^^^^^  File "......../contextlib.py", line 530, in enter_context    result = _enter(cm)TypeError: 'member_descriptor' object is not callable

Furthermore, both (async) with-statement and(Async)ExitStack don't suppot those special dunder methods stored in__dict__. You can verify from this repository:
https://github.com/gottadiveintopython/invest-context-manager

CPython versions tested on:

3.13

Operating systems tested on:

Linux

Linked PRs

• gh-144386: Add support for descriptors in ExitStack and AsyncExitStack #144420