functions</a></li>
  <li><a href="#usage-as-statement" id="toc-usage-as-statement" class="nav-link" data-scroll-target="#usage-as-statement">Usage as statement</a></li>
  <li><a href="#special-return-statements" id="toc-special-return-statements" class="nav-link" data-scroll-target="#special-return-statements">Special return statements</a></li>
  </ul></li>
  <li><a href="#forward-declarations.section" id="toc-forward-declarations.section" class="nav-link" data-scroll-target="#forward-declarations.section">