eyword">val</span> is_bottom : <a href="index.html#type-t">t</a> <span>&#45;&gt;</span> bool</code></dt><dt class="spec value" id="val-empty_node"><a href="#val-empty_node" class="anchor"></a><code><span class="keyword">val</span> empty_node : <a href="index.html#type-node">node</a></code></dt><dt class="spec value" id="val-make_node"><a href="#val-make_node" class="anchor"></a><code><span class="keyword">val</span> make_node : <a href="TraceDomain/index.html#type-t">TraceDomain.t</a> <span>&#45;&gt;</span>