title: Initialization issue in Swift 2
body: <p>I was working on a game with Swift 1 and Xcode 6 and everything was working perfectly. But when I updated to XCode 7 and Swift 2, I was getting a weird issue. In my game I had some NSTimers saved in variables to spawn the enemies. An example of one of this variables was something like this:</p>
  
  <pre><code>var firstTimer = NSTimer.scheduledTimerWithTimeInterval(actualTime, target: self, selector: Selector("SpawnEnemy"), userInfo: nil, repeats: true)
  </code></pre>
  
  <p>When I updated, every variable of this type (I had like 4) got an issue that says: "<em>Initialization of variable "firstTimer" was never used; consider replacing with assignment to "_" or removing it.</em>"</p>
  
  <p>I can't just change every variable's name to "_", and I never had to initialize it.
  What is going on? And why didn't this happened before?</p>
  
  <p><em>btw: I do use this variables in the code.</em></p>