&gt;</span> <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> unit</code></dt><dt class="spec value" id="val-empty"><a href="#val-empty" class="anchor"></a><code><span class="keyword">val</span> empty : <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-of_list"><a href="#val-of_list" class="anchor"></a><code><span class="keyword">val</span> of_list : <span>int list</span> <span>&#45;&gt;</span> <a href="index.html#type-t">t</a></code></dt><dt class="spec value" id="val-is_em