[ty] Fix bug where ty would think that a `Callable` with a variadic positional parameter could be a subtype of a `Callable` with a positional-or-keyword parameter by AlexWaygood · Pull Request #23610 · astral-sh/ruff (original) (raw)

and others added 2 commits

February 27, 2026 14:40

…rd params

When a variadic (*args) parameter was matched against positional-or-keyword parameters from the supertype, those parameters were collected for keyword checking later. However, if both parameter iterators were exhausted simultaneously, the loop returned early without verifying that the keyword portion of those parameters could also be satisfied. This caused (*args: int) to incorrectly be considered a subtype of (a: int), even though a can be passed as a keyword argument which *args cannot accept.

The fix ensures that when unmatched keyword parameters exist, the loop breaks to the keyword-matching code instead of returning early.

https://claude.ai/code/session_015KWJHraC4EMq4ruyp78ESc

carljm added a commit that referenced this pull request

Feb 27, 2026

main: [ty] Take myself out of the reviewer pool for the next few days (#23618) [ty] Fix bug where ty would think that a Callable with a variadic positional parameter could be a subtype of a Callable with a positional-or-keyword parameter (#23610) [ruff] Add fix for none-not-at-end-of-union (RUF036) (#22829) Bump cargo dist to 0.31 (#23614) [pyflakes] Fix false positive for names shadowing re-exports (F811) (#23356) [fastapi] Handle callable class dependencies with __call__ method (FAST003) (#23553) [ty] Recurse into tuples and nested tuples when applying special-cased validation of isinstance() and issubclass() (#23607) Update typing conformance suite commit (#23606) [ty] Detect invalid uses of @final on non-methods (#23604) [ty] Move the type hierarchy request handlers to individual modules [ty] Wire up the type hierarchy implementation with the LSP [ty] Add routine for mapping from system path to vendored path [ty] Implement internal routines for providing the LSP "type hierarchy" feature [ty] Add some helper methods on ClassLiteral [ty] Move some module name helper routines to methods on ModuleName [ty] Bump version of lsp-types [ty] Refactor to support building constraint sets differently (#23600) [ty] Dataclass transform: neither frozen nor non-frozen (#23366) [ty] Add snapshot tests for advanced invalid-assignment scenarios (#23581) [ty] disallow negative narrowing on SubclassOf types (#23598)

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[ty] Fix bug where ty would think that a Callable with a variadic positional parameter could be a subtype of a Callable with a positional-or-keyword parameter by AlexWaygood · Pull Request #23610 · astral-sh/ruff (original) (raw)

[ty] Fix bug where ty would think that a `Callable` with a variadic positional parameter could be a subtype of a `Callable` with a positional-or-keyword parameter by AlexWaygood · Pull Request #23610 · astral-sh/ruff (original) (raw)