title: How to partial import in stylus
body: <p>How to implement partial import (extend, include, inheritance) in stylus?<br>
  For instance I have two files:  </p>
  
  <ul>
  <li><p>foo.styl <code>body {color:orange} a {color: blue}</code></p></li>
  <li><p>bar.styl</p></li>
  </ul>
  
  <p>Within file <code>bar.styl</code> I want place <code>body {color:orange}</code> from <code>foo.styl</code> but do not want <code>a {color: blue}</code><br>
  How can it be implemented?</p>