<span>@deprecated</span> <span class="type-annotation"><a href="dart-core/int-class.html">int</a></span> <span class="parameter-name">onError</span>(<span class="parameter" id="onError-param-source"><span class="type-annotation"><a href="dart-core/String-class.html">String</a></span> <span class="parameter-name">source</span></span>)</span> })
      <div class="features">override</div>
    </section>
    <section class="desc markdown">
      <p>Parse <code>source</code> as a, possibly signed, integer litera