struct User {

    let id: Int
    let name: String
    let email: String?

    static let create = curry(User.init)  // ОШИБКА компиляции

    init(id: Int, name: String, email: String?) {
        self.id = id
        self.name = name
        self.email = email
    }

    init(id: Int, name: String) {
        self.id = id
        self.name = name
        self.email = .none
    }
}


func curry<A, B, R>(_ f: @escaping (A, B) -> R)  ->  ((A) -> ((B) -> R))  {
    return { a in
        { b in
            f(a, b)
        }
    }
}

func curry<A, B, C, R>(_ f: @escaping (A, B, C) -> R)  ->  ((A) -> ((B) -> ((C) -> R))) {
    return { a in
        { b in
            { c in
                f(a, b, c)
            }
        }
    }
}


. . . . . . .