lass="type-annotation"><a href="dart-core/bool-class.html">bool</a></span> <span class="parameter-name">test</span>(<span class="parameter" id="test-param-element"><span class="type-annotation">T</span> <span class="parameter-name">element</span></span>)</span>)
            <span class="returntype parameter">&#8594; <a href="dart-async/Future-class.html">Future</a><span class="signature">&lt;<a href="dart-core/bool-class.html">bool</a>&gt;</span></span>
          </span>
        </dt>
        <dd class="inh