"keyword">val</span> bind_payload : 
  <span>f:<span>( <span><span class="type-var">'payload1</span> <span class="arrow">&#45;&gt;</span></span> <span><span class="type-var">'payload2</span> option</span> )</span> <span class="arrow">&#45;&gt;</span></span>
  <span><span><span class="type-var">'payload1</span> <a href="#type-t">t</a></span> <span class="arrow">&#45;&gt;</span></span>
  <span><span class="type-var">'payload2</span> <a href="#type-t">t</a></span></span></code></div></div></div></body></html>