[red-knot] Add KnownFunction variants for is_protocol, get_protocol_members and runtime_checkable#17450
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AlexWaygood merged 1 commit intomainfrom Apr 17, 2025
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…col_members` and `runtime_checkable`
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sharkdp
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| /// `typing(_extensions).is_protocol` | ||
| IsProtocol, |
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No, no, no! This is clearly the place where typing.dataclass_transform belongs.
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* main: [red-knot] Detect version-related syntax errors (#16379) [`pyflakes`] Add fix safety section (`F841`) (#17410) [red-knot] Add `KnownFunction` variants for `is_protocol`, `get_protocol_members` and `runtime_checkable` (#17450) Bump 0.11.6 (#17449) Auto generate `visit_source_order` (#17180) [red-knot] Initial tests for protocols (#17436) [red-knot] Dataclasses: synthesize `__init__` with proper signature (#17428) [red-knot] Dataclasses: support `order=True` (#17406)
dcreager
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* main: (123 commits) [red-knot] Handle explicit class specialization in type expressions (#17434) [red-knot] allow assignment expression in call compare narrowing (#17461) [red-knot] fix building unions with literals and AlwaysTruthy/AlwaysFalsy (#17451) [red-knot] Type narrowing for assertions (take 2) (#17345) [red-knot] class bases are not affected by __future__.annotations (#17456) [red-knot] Add support for overloaded functions (#17366) [`pyupgrade`] Add fix safety section to docs (`UP036`) (#17444) [red-knot] more type-narrowing in match statements (#17302) [red-knot] Add some narrowing for assignment expressions (#17448) [red-knot] Understand `typing.Protocol` and `typing_extensions.Protocol` as equivalent (#17446) Server: Use `min` instead of `max` to limit the number of threads (#17421) [red-knot] Detect version-related syntax errors (#16379) [`pyflakes`] Add fix safety section (`F841`) (#17410) [red-knot] Add `KnownFunction` variants for `is_protocol`, `get_protocol_members` and `runtime_checkable` (#17450) Bump 0.11.6 (#17449) Auto generate `visit_source_order` (#17180) [red-knot] Initial tests for protocols (#17436) [red-knot] Dataclasses: synthesize `__init__` with proper signature (#17428) [red-knot] Dataclasses: support `order=True` (#17406) [red-knot] Super-basic generic inference at call sites (#17301) ...
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Summary
We want to special-case these functions to allow us to introspect red-knot's inference of protocol types (see tests at https://github.com/astral-sh/ruff/blob/main/crates/red_knot_python_semantic/resources/mdtest/protocols.md). Doing this is a necessary precondition for adding the special casing.
Test Plan
I updated the
known_function_roundtrip_from_strunit test. This PR doesn't actually add the special casing yet, so no new mdtests for now.