anchor.diff:  
     Atom() : super(context['atom']) {
       _commands = new CommandRegistry(obj['commands']);
  -    // _config = new Config(obj['config']);
  +    _config = new Config(obj['config']);
       // _contextMenu = new ContextMenuManager(obj['contextMenu']);
       // _grammars = new GrammarRegistry(obj['grammars']);
       _notifications = new NotificationManager(obj['notifications']);
  
positive.code:   }
  
    CommandRegistry get commands => _commands;
    // Config get config => _config;
    // ContextMenuManager get contextMenu => _contextMenu;
    // GrammarRegistry get grammars => _grammars;
    NotificationManager get notifications => _notifications;
  
negative.code: 
  class Atom extends ProxyHolder {
    CommandRegistry _commands;
    Config _config;
    // ContextMenuManager _contextMenu;
    // GrammarRegistry _grammars;
    NotificationManager _notifications;
  