turn _buffer.toString();</code>, even if the  <code>--delete-tostring-package-uri</code>
option would otherwise apply and replace it with <code>return super.toString()</code>.</p>
<pre class="language-dart"><code class="language-dart">class MyStringBuffer {
  StringBuffer _buffer = StringBuffer();

  // ...

  @keepToString
  @override
  String toString() {
    return _buffer.toString();
  }
}
</code></pre>
        </section>
                <section class="summary source-code" id="source">
          <h2><s