bug.dart

void main() {
  var service = Service();
  service.data.get(or: 99);
}

class Service<T> {
  final Loading<T> data;
  Service({this.data = Loading.loading});
}


class Loading<T> {
  
  final bool isLoading;
  
  final T data;
  
  const Loading(this.isLoading, this.data);
  
  // static const Loading loading = Loading(true, null); <- doesn't compile
  static const loading = Loading(true, null);
  
  
  T get({T or}) {
    if(isLoading) {
      return or;
    }
    return data;
  }
}