title: Error Xcode 6 --> Error SourceKit terminated. Editor functionality temporarily limited
body: <p>Sometimes I get this error in Xcode 6 and the canvas turns white.</p>
  
  <p><img src="https://i.stack.imgur.com/wRip1.png" alt="enter image description here">
  Am I the only one this happens to, or is it a bug?</p>