al-choose_opt"><a href="#val-choose_opt" class="anchor"></a><code><span><span class="keyword">val</span> choose_opt : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-elt">elt</a> option</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-find"><a href="#val-find" class="anchor"></a><code><span><span class="keyword">val</span> find : <span><a href="#type-elt">elt</a> <span class="arrow">&#45;&gt;</span></span> <span><a