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protocol Machine {
    func value() -> Self
}
//struct that returns itself
struct Fun:Machine {
    var elem:Int
    func value() -> Fun {
        return self;
    }
}

//struct that returns itself
struct string:Machine {
    var elem:String
    func value() -> string {
        return self;
    }
}

var storage = [Machine]()
storage.append(Fun(elem:4))
storage.append(string(elem:"fooo"))

let tester = storage[0].value()