>>>
class Foo {
  static final UNKNOWN_ERROR = new MapsEngineStatus._('UNKNOWN_ERROR', context[
      'google']['maps']['visualization']['MapsEngineStatus']['UNKNOWN_ERROR']);
}
<<<
class Foo {
  static final UNKNOWN_ERROR = new MapsEngineStatus._(
      'UNKNOWN_ERROR',
      context['google']['maps']['visualization']['MapsEngineStatus']
          ['UNKNOWN_ERROR']);
}