title: Can we access twig inner property on construction?
body: <p>Let's say I'm constructing a Twig object and I want to access an inner property defined previously:</p>
  <pre><code>{% set my_object = 
    default_width: 12,
    default_height: default_width * 2
  %}
  </code></pre>
  <p>This throws a <code>Variable &quot;default_width&quot; does not exist</code> error, which make sense since the object was not entirely declared yet but is there a way to make this work without two instructions?</p>