ode/index.html">Node</a></span><span> : <span class="keyword">sig</span> ... <span class="keyword">end</span></span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-t"><a href="#type-t" class="anchor"></a><code><span><span class="keyword">type</span> t</span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fold_succs"><a href="#val-fold_succs" class="anchor"></a><code><span><span class="keyword">val</span> fold_succs : <span><a href="#type-