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any, some or generic: what compiles and what's the difference?

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Task

Which declarations compile, and how do they differ?

protocol Hello {}

func say1(h: Hello) {}
func say2(h: any Hello) {}
func say3(h: some Hello) {}
func say4<T: Hello>(h: T) {}

protocol Returnable {
    associatedtype Kind
}
func returnTheType(object: Returnable) -> Returnable.Kind

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