Trackstack includes __aexit__ in contextlib which is not in previous versions

[graingert]

import contextlib


@contextlib.asynccontextmanager
async def f():
    try:
        yield
    finally:
        pass

async def amain():
    async with f(): 1/0


with contextlib.closing(amain().__await__()) as gen:
    next(gen, None)

Traceback (most recent call last):
  File "/home/graingert/projects/cpython/demo.py", line 16, in <module>
    next(gen, None)
  File "/usr/lib/python3.11/contextlib.py", line 222, in __aexit__
    await self.gen.athrow(typ, value, traceback)
  File "/home/graingert/projects/cpython/demo.py", line 7, in f
    yield
  File "/home/graingert/projects/cpython/demo.py", line 12, in amain
    async with f(): 1/0
                    ~^~
ZeroDivisionError: division by zero

Originally posted by @graingert in #92118 (comment)

Linked PRs

• gh-95882: fix regression in the traceback of exceptions propagated from inside a contextlib context manager #95883
• [3.10] gh-95882: Add tests for traceback from contextlib context managers (GH-95883) #100715
• [3.11] gh-95882: fix regression in the traceback of exceptions propagated from inside a contextlib context manager (GH-95883) #100718

[graingert]

see also #27024

[graingert]

I think the test cases and code for contextlib.contextmanager and contextlib.ExitStack should be automatically generated from the test cases and code for contextlib.asynccontextmanager and contextlib.AsyncExitStack

this is done in httpcore with https://github.com/encode/httpcore/blob/master/unasync.py

[iritkatriel]

Unassigned myself since you are working on it.