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## Summary
The test I've added illustrates the fix. Copying it here too:
```python
from contextlib import contextmanager
from typing import Iterator
from typing_extensions import Self
class Base:
@classmethod
@contextmanager
def create(cls) -> Iterator[Self]:
yield cls()
class Child(Base): ...
with Base.create() as base:
reveal_type(base) # revealed: Base (after the fix, None before)
with Child.create() as child:
reveal_type(child) # revealed: Child (after the fix, None before)
```
Full disclosure: I've used LLMs for this PR, but the result is
thoroughly reviewed by me before submitting. I'm excited about my first
Rust contribution to Astral tools and will address feedback quickly.
Related to https://github.com/astral-sh/ty/issues/2030, I am working on
a fix for the TypeVar case also reported in that issue (by me)
<!-- What's the purpose of the change? What does it do, and why? -->
## Test Plan
<!-- How was it tested? -->
Updated mdtests
---------
Co-authored-by: Douglas Creager <dcreager@dcreager.net>
6e89e0abff