[flutter_bloc_0.19.0] Nested RepositoryProvider

main.dart

class MyWidget extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return RepositoryProvider<RepositoryA>(
      builder: (context) => RepositoryA(),
      child: RepositoryProvider<RepositoryB>(
        builder: (context) => RepositoryB(),
        child: RepositoryProvider<RepositoryC>(
          builder: (context) => RepositoryC(),
          child: ChildA(),
        )
      )
    );
  }
}