an>(<span><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> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="label">init</span>:<span class="type-var">'acc</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span>(<span class="type-var">'acc</span>, string)</span> <span class="xref-unresolved">Stdlib</span>.result</span></span></code></div><div class="spec-