(<span><a href="#type-elt">elt</a> <span class="arrow">&#45;&gt;</span></span> <a href="#type-elt">elt</a>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span>
  unit</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-init_cost"><a href="#val-init_cost" class="anchor"></a><code><span><span class="keyword">val</span> init_cost : <span><span class="label">of_node</span>:<span>(<span><a href="../../