[red-knot] Move name field on parameter kind
#16830
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Previously, the `name` field was on `Parameter` which required it to be always optional regardless of the parameter kind because a `typing.Callable` signature does not have name for the parameters. This is the case for positional-only parameters. This wasn't enforced at the type level which meant that downstream usages would have to unwrap on `name` even though it's guaranteed to be present. This commit moves the `name` field from `Parameter` to the `ParameterKind` variants and makes it optional only for `ParameterKind::PositionalOnly` variant while required for all other variants. One change that's now required is that a `Callable` form using a gradual form for parameter types (`...`) would have a default `args` and `kwargs` name used for variadic and keyword-variadic parameter kind respectively. This is also the case for invalid `Callable` type forms. I think this is fine as names are not relevant in this context but happy to make it optional even in variadic variants.
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dcreager
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Mar 18, 2025
dcreager
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Mar 18, 2025
* main: [playground] Avoid concurrent deployments (#16834) [red-knot] Infer `lambda` return type as `Unknown` (#16695) [red-knot] Move `name` field on parameter kind (#16830) [red-knot] Emit errors for more AST nodes that are invalid (or only valid in specific contexts) in type expressions (#16822) [playground] Use cursor for clickable elements (#16833) [red-knot] Deploy playground on main (#16832) Red Knot Playground (#12681) [syntax-errors] PEP 701 f-strings before Python 3.12 (#16543)
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Summary
Previously, the
namefield was onParameterwhich required it to be always optional regardless of the parameter kind because atyping.Callablesignature does not have name for the parameters. This is the case for positional-only parameters. This wasn't enforced at the type level which meant that downstream usages would have to unwrap onnameeven though it's guaranteed to be present.This commit moves the
namefield fromParameterto theParameterKindvariants and makes it optional only forParameterKind::PositionalOnlyvariant while required for all other variants.One change that's now required is that a
Callableform using a gradual form for parameter types (...) would have a defaultargsandkwargsname used for variadic and keyword-variadic parameter kind respectively. This is also the case for invalidCallabletype forms. I think this is fine as names are not relevant in this context but happy to make it optional even in variadic variants.Test Plan
No new tests; make sure existing tests are passing.