In the next code I'm trying to call the deinit method releasing all the references to the Person Class instance Mark but the deinit is never called. Why? class Person{ let name:String init(name:String){ self.name = name println("Person created") } deinit { println("Person \(name) deinit") } } var Mark:Person? = Person(name:"Mark") Mark = nil // Shouldn't the person deinit method be called here? It