tor
</pre>
<p>

The functions <code class="literal">ref</code> and <code class="literal">cref</code> mostly 
exist for historical reasons,
and <code class="literal">ref</code> can always
be replaced with <code class="literal">var</code>, and <code class="literal">cref</code> with
<code class="literal">constant_ref</code>. 
See <a class="xref" href="le_in_details.html#lambda.delaying_constants_and_variables" title="Delaying constants and variables">the section called &#8220;Delaying constants and variables&#