n></span>
  <span>join:<span>( <span><span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span> <span class="type-var">'a</span> )</span> <span class="arrow">&#45;&gt;</span></span>
  <span>init:<span class="type-var">'a</span> <span class="arrow">&#45;&gt;</span></span>
  <span><a href="#type-t">t</a> <span class="arrow">&#45;&gt;</span></span>
  <span class="type-var">'a</span></span></code></div></div><di