title: SourceKitService Terminated with no Xcode warning or errors
body: <p>I was spacing out while starting a new project to port one of my Obj-C/SpriteKit apps over to Swift and started to add a touch for loop within touchesMoved. My mistake, but the weird issue is that I get "SourceKitService Terminated" and Xcode completely bugs out.</p>
  
  <pre><code>override func touchesMoved(touches: NSSet!, withEvent event: UIEvent!) {
      for touch: AnyObject in touches {
  
      }
  } 
  </code></pre>
  
  <p>Specifically, this happens the moment I begin to type "touches" in the for loop. Entering "for touch: AnyObject in" everything is still fine. As soon as I continue to type "touches"... SourceKitService Terminated.</p>
  
  <p>I get that this should be an error, but why is Xcode completely freaking out because of this?</p>