span class="nx">Identifier</span><span class="o">:</span><span class="w"> </span><span class="p">(</span><span class="nx">node</span><span class="p">,</span><span class="w"> </span><span class="nx">state</span><span class="p">)</span><span class="w"> </span><span class="p">=&gt;</span><span class="w"> </span><span class="p">{</span>
<span class="w">    </span><span class="nx">applyCheck</span><span class="p">(</span><span class="nx">state</span><span class="p">,</span><span class="w"> </span><span class="s1