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Shunsuke Shibayama dc64c08633
[ty] bidirectional type inference using function return type annotations (#20528) 
## Summary

Implements bidirectional type inference using function return type
annotations.

This PR was originally proposed to solve astral-sh/ty#1167, but this
does not fully resolve it on its own.
Additionally, I believe we need to allow dataclasses to generate their
own `__new__` methods, [use constructor return types ​​for
inference](5844c0103d/crates/ty_python_semantic/src/types.rs (L5326-L5328)),
and a mechanism to discard type narrowing like `& ~AlwaysFalsy` if
necessary (at a more general level than this PR).

## Test Plan

`mdtest/bidirectional.md` is added.

---------

Co-authored-by: Alex Waygood <Alex.Waygood@Gmail.com>
Co-authored-by: Ibraheem Ahmed <ibraheem@ibraheem.ca>
 		2025-10-11 00:38:35 +00:00
..
corpus [ty] fix deferred name loading in PEP695 generic classes/functions (#19888) 2025-08-13 15:51:59 -07:00
mdtest [ty] bidirectional type inference using function return type annotations (#20528) 2025-10-11 00:38:35 +00:00
primer [ty] Update mypy_primer and project lists (#20798) 2025-10-10 11:08:39 +02:00
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.