title: How to print the class, if there is a variable name
body: <p>I have a variable:</p>
  
  <pre><code>@test: this_is_var;
  </code></pre>
  
  <p>And I have class</p>
  
  <pre><code>.my-@{test}-class{}
  </code></pre>
  
  <p><strong>How to print this class in another class?</strong></p>
  
  <p>This code is wrong:</p>
  
  <pre><code>.test-class{
      .my-@{test}-class();
  }
  </code></pre>
  
  <p>But this code is work fine</p>
  
  <pre><code>.test-class{
      .my-this_is_var-class();
  }
  </code></pre>
  
  <p>Why? And how to print this class: <code>.my-@{test}-class()</code>?</p>