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d54c19b983
## Summary Simplification follow-up to #15413. There's no need to have a dedicated `CallOutcome` variant for every known function, it's only necessary if the special-cased behavior of the known function includes emitting extra diagnostics. For `typing.cast`, there's no such need; we can use the regular `Callable` outcome variant, and update the return type according to the cast. (This is the same way we already handle `len`.) One reason to avoid proliferating unnecessary `CallOutcome` variants is that currently we have to explicitly add emitting call-binding diagnostics, for each outcome variant. So we were previously wrongly silencing any binding diagnostics on calls to `typing.cast`. Fixing this revealed a separate bug, that we were emitting a bogus error anytime more than one keyword argument mapped to a `**kwargs` parameter. So this PR also adds test and fix for that bug. ## Test Plan Existing `cast` tests pass unchanged, added new test for `**kwargs` bug. |
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