title: How to generate type hierarchy diagrams with Scaladoc?
body: <p>I want that Scaladoc generates a type hierarchy diagram for the following code snippet:</p>
  
  <pre><code>trait A
  trait B extends A
  </code></pre>
  
  <p>But when I execute <code>scaladoc &lt;file&gt;.scala</code> there is no type hierarchy shown - neither in <code>A</code> nor in <code>B</code>. How can I generate such diagrams?</p>