with-copy"><code class="sourceCode stan"><span id="cb1-1"><a href="#cb1-1" aria-hidden="true" tabindex="-1"></a><span class="dt">real</span> normal_density(<span class="dt">real</span> x,             <span class="co">// Function argument</span></span>
<span id="cb1-2"><a href="#cb1-2" aria-hidden="true" tabindex="-1"></a>                    <span class="dt">real</span> xc,            <span class="co">// Complement of function argument</span></span>
<span id="cb1-3"><a href="#cb1-3" aria-hidden="true" tabind