ank" class="anchor"></a><code><span><span class="keyword">type</span> rank</span></code></div></div><div class="odoc-spec"><div class="spec type" id="type-elt" class="anchored"><a href="#type-elt" class="anchor"></a><code><span><span class="keyword">type</span> elt</span></code></div></div><div class="odoc-spec"><div class="spec value" id="val-add" class="anchored"><a href="#val-add" class="anchor"></a><code><span><span class="keyword">val</span> add : <span><a href="#type-t">t</a> <span class="arrow">&#45;