title: twig: can not override block in included file
body: <p>How can I override a block inside an included template file?</p>
  
  <p><strong>example:</strong></p>
  
  <pre><code>{# layout.html #}
  {% include "menu.html" %}
  
  {# menu.html #}
  {% block overrideme %}{% endblock %}
  
  {# index.html #}
  {% extends "layout.html" %}
  {% block overrideme %}Overriden{% endblock %}
  </code></pre>
  
  <p>I read somewhere that a trait function was implemented? I can't find any documentation about it though, does anyone know how I could make this work?</p>