word">val</span> comparator : <span><span>( <a href="E/index.html#type-t">E.t</a>, <a href="#type-comparator_witness">comparator_witness</a> )</span> <span class="xref-unresolved">Base__Comparator</span>.comparator</span></span></code></div></div></details></div><div class="odoc-spec"><div class="spec value" id="val-substs_of_alist" class="anchored"><a href="#val-substs_of_alist" class="anchor"></a><code><span><span class="keyword">val</span> substs_of_alist : <span><span><span>(<a href="../index.html#type-