title: How to pass argument from mixin to another in lesscss?
body: <p>I'm using the LESS CSS module 7.x-2.4 in Drupal 7.8
  I would like to use style mixins which pass arguments to another mixin. In the example passing the color as a string "#CC00CC" works ok, but not as an variable like that "darken(@col, 10%)".</p>
  
  <pre><code>@bg(@colBg){
    background-color: @colBg; 
  }
  
  @style(@col){
    border: 2px solid lighten(@col, 10%); // ok
    @bg(#CC00CC); // ok - color is passed
    @bg(darken(@col, 10%)); // Color is not being passed to @bg
  }
  
  .buttonSubmit{
   @style(#FF00FF); 
  }
  </code></pre>
  
  <p>How can I achieve cascading variables from the css-class to a mixnin which passes the argument to another mixin?</p>