re class="language-dart"><code class="language-dart">void start() {
  if (_stop != null) {
    &#47;&#47; (Re)start this stopwatch.
    &#47;&#47; Don&#39;t count the time while the stopwatch has been stopped.
    _start += _now() - _stop;
    _stop = null;
  }
}</code></pre>
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