s="arrow">&#45;&gt;</span></span> <span><a href="../FieldPath/index.html#type-t">FieldPath.t</a> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'accum</span>)</span> <span class="arrow">&#45;&gt;</span></span>
  <span class="type-var">'accum</span></span></code></div><div class="spec-doc"><p>Folds over the terminal field paths of the given field of the formal return. See <a href="#val-fold_cells"><code>fold_cells</code></a>.</p></div></div><p>Special instances of <code>fold_...</code> fu