  <span><span><a href="#type-t">t</a> option</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="../VarPath/index.html#type-t">VarPath.t</a> <span class="arrow">&#45;&gt;</span></span>
  <span>init:<span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span>
  <span>f:<span>(<span><span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span> <span><a href="../Cell/index.html#type-t">Cell.t</a> <span class="arrow">&#45;&gt;</span></span> <span class="typ