title: Use of unresolved identifier 'NSRunLoop'
body: <p>Swift complaints that <code>NSRunLoop</code> is a unresolved identifier in <code>main.swift</code></p>
  
  <pre><code>import Foundation
  let runloop = NSRunLoop.currentRunLoop();
  runloop.run();
  </code></pre>
  
  <p>Why? Isn't <code>NSRunLoop</code> a part of Foundation?</p>
  
  <p><img src="https://i.stack.imgur.com/5PiGe.png" alt="enter image description here"></p>