ass="parameter-name">test</span>(<span class="parameter" id="test-param-element"><span class="type-annotation">E</span> <span class="parameter-name">element</span></span>)</span>)
    </section>
    <section class="desc markdown">
      <p>This operation is not supported by an unmodifiable list.</p>
    </section>
    
    <section class="summary source-code" id="source">
      <h2><span>Implementation</span> </h2>
      <pre class="language-dart"><code class="language-dart">void retainWhere(bool test(E ele