title: Nunjucks nested blocks
body: <p>I'm just getting started with Nunjucks and am having trouble getting nested blocks to work. I have a controller block with some code, inside of which the content should be nested. But when I specify the content in my template file, it doesn't appear in the HTML output from Nunjucks. Here are the files (simplified):</p>
  
  <p>components/controller.html.njk:</p>
  
  <pre><code>&lt;div id="controller"&gt;
      {% block controllerContent %}
      {% endblock %}
  &lt;/div&gt;
  </code></pre>
  
  <p>layouts/layout.html.njk:</p>
  
  <pre><code>{% include "components/controller.html.njk" %}
  </code></pre>
  
  <p>index.html.njk:</p>
  
  <pre><code>{% extends "layouts/layout.html.njk" %}
  
  {% block controllerContent %}
    CONTROLLER CONTENT HERE
  {% endblock %}
  </code></pre>
  
  <p>How can I get the content specified in controllerContent to show up inside the controller?</p>