../../index.html">bastet</a> &#x00BB; <a href="../../index.html">Bastet</a> &#x00BB; <a href="../index.html">Interface</a> &#x00BB; FOLDABLE</nav><h1>Module type <code>Interface.FOLDABLE</code></h1></header><dl><dt class="spec type" id="type-t"><a href="#type-t" class="anchor"></a><code><span class="keyword">type</span> <span>'a t</span></code></dt></dl><dl><dt class="spec value" id="val-fold_left"><a href="#val-fold_left" class="anchor"></a><code><span class="keyword">val</span> fold_left : <span>(<span cl