l, null, _rootZone, callback);
    return;
  }
  _ZoneFunction implementation = currentZone._scheduleMicrotask;
  if (identical(_rootZone, implementation.zone) &amp;&amp;
      _rootZone.inSameErrorZone(currentZone)) {
    _rootScheduleMicrotask(
        null, null, currentZone, currentZone.registerCallback(callback));
    return;
  }
  Zone.current.scheduleMicrotask(Zone.current.bindCallbackGuarded(callback));
}</code></pre>
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