title: Twig. Overriding already set variable
body: <p>I've looked for resolving issue, that was asked in this question. <a href="https://github.com/fabpot/Twig/issues/1244" rel="nofollow">https://github.com/fabpot/Twig/issues/1244</a></p>
  
  <p>But for me, somehow that does not work...</p>
  
  <pre><code>#layout.html.twig
  {{ show }}
  
  #base1.html.twig
  {% extends 'layout.html.twig' %}
  {% set show = 0 %}
  
  #base2.html.twig
  {% extends 'base1.html.twig' %}
  {% set show = 1 %}
  </code></pre>
  
  <p>But when i render base2, i see only 0 ... 
  Why it is not 1 ?</p>