span><a href="#type-state">state</a> <span class="arrow">&#45;&gt;</span></span> bool</span></code></div></div><p><b>TODO</b> : <code>union</code> and <code>star</code> operations</p><div class="odoc-spec"><div class="spec value anchored" id="val-trans"><a href="#val-trans" class="anchor"></a><code><span><span class="keyword">val</span> trans : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-state">state</a> <span class="arrow">&#45;&gt;</span></span> <span><a 