unify explicit generic param semchecking in calls #22618
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narimiran
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Caught in https://github.com/metagn/applicates, I'm not sure which commit causes this but it's also in the 2.0 branch (but not 2.0.2), so it's not any recent PRs. If a proc has a static parameter with type `static Foo[T]`, then another parameter with type `static Bar[T, U]`, the generic instantiation for `Bar` doesn't match `U` which has type `tyGenericParam`, but matches `T` since it has type `tyTypeDesc`. The reason is that `concreteType` returns the type itself for `tyTypeDesc` if `c.isNoCall` (i.e. matching a generic invocation), but returns `nil` for `tyGenericParam`. I'm guessing `tyGenericParam` is received here because of #22618, but that doesn't explain why `T` is still `tyTypeDesc`. I'm not sure. Regardless, we can just copy the behavior for `tyTypeDesc` to `tyGenericParam` and also return the type itself when `c.isNoCall`. This feels like it defeats the purpose of `concreteType` but the way it's used doesn't make sense without it (generic param can't match another generic param?). Alternatively we could loosen the `if concrete == nil: return isNone` checks in some places for specific conditions, whether `c.isNoCall` or `c.inGenericContext == 0` (though this would need #24005).
narimiran
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Caught in https://github.com/metagn/applicates, I'm not sure which commit causes this but it's also in the 2.0 branch (but not 2.0.2), so it's not any recent PRs. If a proc has a static parameter with type `static Foo[T]`, then another parameter with type `static Bar[T, U]`, the generic instantiation for `Bar` doesn't match `U` which has type `tyGenericParam`, but matches `T` since it has type `tyTypeDesc`. The reason is that `concreteType` returns the type itself for `tyTypeDesc` if `c.isNoCall` (i.e. matching a generic invocation), but returns `nil` for `tyGenericParam`. I'm guessing `tyGenericParam` is received here because of #22618, but that doesn't explain why `T` is still `tyTypeDesc`. I'm not sure. Regardless, we can just copy the behavior for `tyTypeDesc` to `tyGenericParam` and also return the type itself when `c.isNoCall`. This feels like it defeats the purpose of `concreteType` but the way it's used doesn't make sense without it (generic param can't match another generic param?). Alternatively we could loosen the `if concrete == nil: return isNone` checks in some places for specific conditions, whether `c.isNoCall` or `c.inGenericContext == 0` (though this would need (cherry picked from commit 24e5b21)
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fixes #9040