class Cat { init() { print("Cat init(\(ObjectIdentifier(self))") } deinit { print("Cat deinit(\(ObjectIdentifier(self))") } var catProp: Cat { get { return Cat() } set { print("catProp setter: \(ObjectIdentifier(self))") } } var age: Int = 0 } func f1(_ x: inout Cat) { print("f1 begin") x = Cat() print("f1 end") } func f2(_ x: inout Int) { print("f2") x = 33 } func main() { print("b") f2(&Cat().age) print("c") } main()