class C {
    lazy var x: () -> Void = {
        return { print("hi") }
    }()

    lazy var y: (Int) -> Void = { // `input in` shouldn't be written here!
        return { input in
            print(input)
        }
    }()

    var r: () -> Void = {
        return { print("hi") }
    }()

    let t: () -> Void = {
        return { print("bye") }
    }()

    let yy: (Int) -> Void = { // `input in` shouldn't be written here!
        return { input in
            print(input)
        }
    }()
}
let c = C()
let k = c.x


print(k) // (Function)
k() // hi
c.x() // hi
c.y(5) // hi
c.r()
c.r = c.t
print("new")
c.r
c.yy(10)
c.yy(15) // Can pass different arguemnt
c.t = c.r // Can't change the actual closure itself. It's a let. Needs to be changed to `var`
c.t()