Spurious error message using `some` when using wrong number of primary associated types for protocol

### Description The code below emits an error > 'some' types are only permitted in properties, subscripts, and functions in addition to the (correct) error about AsyncSequence expecting two parameters, not just one. ### Reproduction ```swift func test() -> some AsyncSequence<String> { [:] } ``` ### Expected behavior No error on the `some`, only on the specialized(?) protocol type itself. ### Environment Swift version 6.5-dev (LLVM 8f81a64f6a8bcf6, Swift 4d0c97fa5b05711) from swift.godbolt.org ### Additional information _No response_