ef="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> unit</span></code></div></div></details></div><div class="odoc-spec"><div class="spec value anchored" id="val-of_exp"><a href="#val-of_exp" class="anchor"></a><code><span><span class="keyword">val</span> of_exp : <span><a href="#type-exp">exp</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-t">t</a> option</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-mk"><a href="#val-mk" cla