e-t">t</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-elt">elt</a> * <a href="#type-t">t</a></span></code></div><div class="spec-doc"><p>Extract an element from a set, returning the element and the updated set. Raise <code>Not_found</code> if the set is empty</p></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-to_string"><a href="#val-to_string" class="anchor"></a><code><span><span class="keyword">val</span> to_string : <span><a href="#type-t">t</a> <span class="ar