Use a `Protocol` of @MainActor instead of concrete @MainActor class produces an error

Using Swift
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3

@NeonTetra Thanks for the clarification! Also, I noticed that according to this Apple Documentation, if I have only async methods inside a Protocol I can mark @MainActor only MainActorClass and not MainActorProtocol.

Because async methods guarantee isolation by switching to the corresponding actor in the implementation.

But if I do that I am still getting the same error:

actor MyActor {
    let property: MainActorProtocol

    init(property: MainActorProtocol) {
        self.property = property
    }

    func doSomething() async {
        await property.foo() //Sending 'self.property' risks causing data races
    }
}


protocol MainActorProtocol { // actor is not specified
    func foo() async
}

@MainActor
class MainActorClass: MainActorProtocol {
    func foo() async {
        print("foo")
    }
}