 <span>int <span class="arrow">&#45;&gt;</span></span>
  unit</span></code></div></div><div class="odoc-spec"><div class="spec type anchored" id="type-owl_arr_op31"><a href="#type-owl_arr_op31" class="anchor"></a><code><span><span class="keyword">type</span> <span>('a, 'b) owl_arr_op31</span></span><span> =
  <span><span><span>(<span class="type-var">'a</span>, <span class="type-var">'b</span>)</span> <a href="#type-owl_arr">owl_arr</a></span> <span class="arrow">&#45;&gt;</span></span>
  <span><span><span>