n>:<a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> bool</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-top"><a href="#val-top" class="anchor"></a><code><span><span class="keyword">val</span> top : <a href="#type-t">t</a></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-of_unreachable"><a href="#val-of_unreachable" class="anchor"></a><code><span><span class="keyword">val</span> of_unreachable : <span><a href