[flutter_bloc_0.19.0] Repository Provider default constructor

main.dart

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return RepositoryProvider(
      builder: (context) => MyRepository(),
      child: MyChild(),
    );
  }
}

class MyChild extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return BlocProvider(
      builder: (context) => MyBloc(RepositoryProvider.of<MyRepository>(context)),
      child: MyOtherChild(),
    );
  }
}