a><code><span><span class="keyword">val</span> fold_of_pervasives_set_fold : 
  <span><span>(<span><span>(<span><span class="type-var">'elt</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'accum</span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'accum</span>)</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'t</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'accum</span> <span class="arrow"