title: less.css: reference other style definitions?
body: <p>Is it possible to reference other style definitions? For example, if I have a <code>btn</code> style like this:</p>
  
  <pre><code>.btn {
      width: 150px;
  }
  </code></pre>
  
  <p>Is it possible to reference <code>.btn</code>'s <code>width</code> somewhere else? For example, something like:</p>
  
  <pre><code>#right_of_buttons {
      left: @{.btn.width} * 3; // ie, instead of hard-coding 150px * 3
  }
  </code></pre>
  
  <p>I know this can be done by defining a variable:</p>
  
  <pre><code>@btn_width: 150px;
  .btn { width: @btn_width }
  </code></pre>
  
  <p>But I'd rather not do that if I don't need to.</p>