ass="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-sum_items"><a href="#val-sum_items" class="anchor"></a><code><span><span class="keyword">val</span> sum_items : <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="../Item/index.html#type-t">Item.t</a> list</span></span></code></div></div><div class="odoc-spec"><div clas