r" id="test-param-error"><span class="type-annotation"><a href="dart-core/Object-class.html">Object</a></span> <span class="parameter-name">error</span></span>)</span> })
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<wbr><span class="type-parameter">T</span>&gt;</span></span>
          </span>
                  </dt>
        <dd>
          Handles errors emitted by this <a href="dart-async/Future-class.html">Future</a>. <