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Abhijeet Prasad Bodas 68b0386007
[ty] Implement DataClassInstance protocol for dataclasses. (#18018) 
Fixes: https://github.com/astral-sh/ty/issues/92

## Summary

We currently get a `invalid-argument-type` error when using
`dataclass.fields` on a dataclass, because we do not synthesize the
`__dataclass_fields__` member.

This PR fixes this diagnostic.

Note that we do not yet model the `Field` type correctly. After that is
done, we can assign a more precise `tuple[Field, ...]` type to this new
member.

## Test Plan
New mdtest.

---------

Co-authored-by: David Peter <mail@david-peter.de>
2025-05-13 10:31:26 +02:00
..
mdtest [ty] Implement DataClassInstance protocol for dataclasses. (#18018) 2025-05-13 10:31:26 +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.