[5.1] Sema: don't consider opaque types distinct for overloading purposes. #24304
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This is necessary because: ``` func foo() -> some P func foo() -> some P ``` theoretically defines two distinct return types, but there'd be no way to disambiguate them. Disallow overloading only by opaque return type.
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This is necessary because:
theoretically defines two distinct return types, but there'd be no way to disambiguate them. Disallow overloading only by opaque return type.