id="state-iterators"><a href="#state-iterators" class="anchor"></a>State iterators</h2><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-t">t</a> <span class="arrow">&#45;&gt;</span></span> <span><a href="#type-state">state</a> <span class="arrow">&#45;&gt;</span></span> <span><span>(<span><a href="#type-state">state</a> <span class="arrow">&#45;&gt;</span></s