ion <code>foo</code> can be accessed in the Stan program by including the path to the <code>foo.stanfunctions</code> file as:</p>
<div class="sourceCode" id="cb2"><pre class="sourceCode stan code-with-copy"><code class="sourceCode stan"><span id="cb2-1"><a href="#cb2-1" aria-hidden="true" tabindex="-1"></a><span class="kw">functions</span> {</span>
<span id="cb2-2"><a href="#cb2-2" aria-hidden="true" tabindex="-1"></a>  <span class="co">#include foo.stanfunctions;</span></span>
<span id="cb2-3"><a href="#cb