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# Summary
Adds a subdiagnostic hint in the following scenario where a
synchronous `with` is used with an async context manager:
```py
class Manager:
async def __aenter__(self): ...
async def __aexit__(self, *args): ...
# error: [invalid-context-manager] "Object of type `Manager` cannot be used with `with` because it does not implement `__enter__` and `__exit__`"
# note: Objects of type `Manager` *can* be used as async context managers
# note: Consider using `async with` here
with Manager():
...
```
closes https://github.com/astral-sh/ty/issues/508
## Test Plan
New MD snapshot tests
---------
Co-authored-by: David Peter <mail@david-peter.de>
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| .. | ||
| mdtest | ||
| primer | ||
| README.md | ||
Markdown files within the mdtest/ subdirectory are tests of type inference and type checking;
executed by the tests/mdtest.rs integration test.
See crates/ty_test/README.md for documentation of this test format.