title: Use Swift 2.2 with iOS 9.2 and watchOS 2.1?
body: <p>Now that <code>Swift 2.2 / iOS 9.3 / watchOS 2.2</code> is out, can I update an app using <code>Xcode 7.3</code> and still work on a <code>iOS 9.2</code> device?</p>
  
  <p>For example, if I started using <code>#selector(someFunc)</code> instead of <code>selector("someFunc")</code>, will this crash on a <code>iOS 9.2</code> device?</p>