n>
  <span class="hljs-at_rule">@<span class="hljs-keyword">if</span><span class="hljs-preprocessor"> type-of</span>($num) != <span class="hljs-string">"number"</span> {</span>
    <span class="hljs-at_rule">@<span class="hljs-keyword">warn</span> <span class="hljs-string">"num: #{$num} is not a number"</span>;</span>
    <span class="hljs-at_rule">@return<span class="hljs-preprocessor"> null</span>;</span>
  }
  <span class="hljs-at_rule">@return $num / ($num *<span class="hljs-preprocessor"> 0</span> +<sp