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
..
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