mirrors/ruff
1
0
Fork 0
mirror of https://github.com/astral-sh/ruff.git synced 2025-08-04 02:38:25 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions 3
ruff/crates/ty_python_semantic/resources
History
David Peter 4ef2c223c9
[ty] Respect MRO_NO_OBJECT_FALLBACK policy when looking up symbols on type instances (#18312) 
## Summary

This should address a problem that came up while working on
https://github.com/astral-sh/ruff/pull/18280. When looking up an
attribute (typically a dunder method) with the `MRO_NO_OBJECT_FALLBACK`
policy, the attribute is first looked up on the meta type. If the meta
type happens to be `type`, we go through the following branch in
`find_name_in_mro_with_policy`:


97ff015c88/crates/ty_python_semantic/src/types.rs (L2565-L2573)

The problem is that we now look up the attribute on `object` *directly*
(instead of just having `object` in the MRO). In this case,
`MRO_NO_OBJECT_FALLBACK` has no effect in `class_member_from_mro`:


c3feb8ce27/crates/ty_python_semantic/src/types/class.rs (L1081-L1082)

So instead, we need to explicitly respect the `MRO_NO_OBJECT_FALLBACK`
policy here by returning `Symbol::Unbound`.

## Test Plan

Added new Markdown tests that explain the ecosystem changes that we
observe.
2025-05-26 12:03:29 +02:00
..
mdtest [ty] Respect MRO_NO_OBJECT_FALLBACK policy when looking up symbols on type instances (#18312) 2025-05-26 12:03:29 +02:00
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

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.