<span class="type-var">'acc</span> <span class="arrow">&#45;&gt;</span></span> <span>string <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'acc</span></span></code></div></div><div class="odoc-spec"><div class="spec value anchored" id="val-fold_right"><a href="#val-fold_right" class="anchor"></a><code><span><span class="keyword">val</span> fold_right : <span><span class="label">f</span>:<span>(<span>char <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'acc</span>