[Bug] Sendable Closures not propagating down into implementation

[gage-halverson-fetch]

Swift Version

6.0

Package Version

3a0127f

Bug Description

For this protocol

@Mocked
protocol TestProtocol: Sendable {
    func something(work: @escaping @Sendable () -> Void)
}

this Xcode error shows up when compiling in swift 6 mode

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '() -> Void'

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '(@escaping () -> Void) -> Void'

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '() -> TestProtocolMock.SomethingImplementation<() -> Void>.Closure?' (aka '() -> Optional<(@escaping @Sendable () -> ()) -> ()>')

Steps to Reproduce

Turn on strict concurrency with swift 6 compiler mode

@Mocked
protocol TestProtocol: Sendable {
    func something(work: @escaping @Sendable () -> Void)
}

Expected Behavior

No errors

Actual Behavior

No response

Stack Trace / Logs

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '() -> Void'

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '(@escaping () -> Void) -> Void'

/var/folders/zh/vr7mqp6s529cv1tyb8y6rnt40000gn/T/swift-generated-sources/@__swiftmacro_15FetchFoundation16TestProtocolMockC9something13_MockedMethodfMp_.swift:37:13 Stored property '__something' of 'Sendable'-conforming class 'TestProtocolMock' contains non-Sendable type '() -> TestProtocolMock.SomethingImplementation<() -> Void>.Closure?' (aka '() -> Optional<(@escaping @Sendable () -> ()) -> ()>')

Additional Context

No response

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