ruff/crates/ty_python_semantic/resources/mdtest/generics/pep695
Shunsuke Shibayama dc64c08633
Some checks failed
CI / cargo fmt (push) Has been cancelled
CI / mkdocs (push) Has been cancelled
CI / Determine changes (push) Has been cancelled
CI / cargo build (release) (push) Has been cancelled
CI / python package (push) Has been cancelled
CI / pre-commit (push) Has been cancelled
[ty Playground] Release / publish (push) Has been cancelled
CI / cargo clippy (push) Has been cancelled
CI / cargo test (linux) (push) Has been cancelled
CI / cargo test (linux, release) (push) Has been cancelled
CI / cargo test (windows) (push) Has been cancelled
CI / cargo test (wasm) (push) Has been cancelled
CI / cargo build (msrv) (push) Has been cancelled
CI / cargo fuzz build (push) Has been cancelled
CI / fuzz parser (push) Has been cancelled
CI / test scripts (push) Has been cancelled
CI / ecosystem (push) Has been cancelled
CI / Fuzz for new ty panics (push) Has been cancelled
CI / cargo shear (push) Has been cancelled
CI / ty completion evaluation (push) Has been cancelled
CI / formatter instabilities and black similarity (push) Has been cancelled
CI / test ruff-lsp (push) Has been cancelled
CI / check playground (push) Has been cancelled
CI / benchmarks instrumented (ruff) (push) Has been cancelled
CI / benchmarks instrumented (ty) (push) Has been cancelled
CI / benchmarks walltime (medium|multithreaded) (push) Has been cancelled
CI / benchmarks walltime (small|large) (push) Has been cancelled
[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
..
aliases.md [ty] Add support for generic PEP695 type aliases (#20219) 2025-09-08 13:26:21 -07:00
classes.md [ty] Improve diagnostics for bad @overload definitions (#20745) 2025-10-07 21:52:57 +00:00
functions.md [ty] bidirectional type inference using function return type annotations (#20528) 2025-10-11 00:38:35 +00:00
variables.md [ty] Add mdtests that exercise constraint sets (#20319) 2025-09-10 13:22:19 -04:00
variance.md [ty] Fix subtyping for dynamic specializations (#20592) 2025-09-26 15:05:03 +02:00