title: In Swift, didSet doesn’t fire when invoked from init()
body: <p>I’ve got a car and a driver. They mutually reference each other. In the car’s init() I create a driver and assign it to the driver member. The driver member has a didSet method which is supposed to set the driver’s car, thus mutually link them to each other.</p>
  
  <pre><code>class GmDriver {
      var car: GmCar! = nil
  }
  
  class GmCar {
      var driver: GmDriver {
          didSet {
              driver.car = self
          }
      }
      init() {
          driver = GmDriver()
      }
  }
  
  let myCar = GmCar()
  println(myCar.driver.car) // nil
  </code></pre>
  
  <p>However, the didSet never fires. Why?</p>