title: Xcode 8: Cannot inherit from non-open class
body: <p>After I updated to latest Xcode 8, I get this error:</p>
  
  <blockquote>
    <p>Cannot inherit from non-open class ‘WDBaseViewController’ outside of its defining module</p>
  </blockquote>
  
  <p>My class is declared like this</p>
  
  <pre><code>public class ProfileViewController: WDBaseViewController {
  }
  </code></pre>
  
  <p>But I didn’t change the framework.</p>