anchor.diff:  }
   
   Future _checkPackage(Package p) async {
  +  _packages.add(p.name);
     if (p.uploaders == null || p.uploaders.isEmpty) {
       _problems.add('Package(${p.name}) has no uploaders.');
     }
  
positive.code:     print('  .. $_packageChecked done (${p.name})');
    }
  }
  
negative.code: final _userToOauth = <String, String>{};
  final _oauthToUser = <String, String>{};
  final _invalidUsers = Set<String>();
  final _packages = <String>{};
  final _packagesWithVersion = <String>{};
  int _packageChecked = 0;
  int _versionChecked = 0;
  
  Future main(List<String> args) async {
    final argv = _argParser.parse(args);
  