ruff/crates/ty_python_semantic/resources
Carl Meyer 0b181bc2ad
Fix instance vs callable subtyping/assignability (#18260)
## Summary

Fix some issues with subtying/assignability for instances vs callables.
We need to look up dunders on the class, not the instance, and we should
limit our logic here to delegating to the type of `__call__`, so it
doesn't get out of sync with the calls we allow.

Also, we were just entirely missing assignability handling for
`__call__` implemented as anything other than a normal bound method
(though we had it for subtyping.)

A first step towards considering what else we want to change in
https://github.com/astral-sh/ty/issues/491

## Test Plan

mdtests

---------

Co-authored-by: med <medioqrity@gmail.com>
Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
2025-05-22 19:47:05 +00:00
..
mdtest Fix instance vs callable subtyping/assignability (#18260) 2025-05-22 19:47:05 +00:00
primer [ty] Understand classes that inherit from subscripted Protocol[] as generic (#17832) 2025-05-09 17:39:15 +01:00
README.md Rename Red Knot (#17820) 2025-05-03 19:49:15 +02:00

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.