anchor.diff:  part of hop;
   
   class Runner {
  +  static const String _colorParam = 'color';
     static const String RAW_TASK_LIST_CMD = 'print_raw_task_list';
     static final ArgParser _parser = _getParser();
     final ArgResults _args;
  
positive.code: 
    @protected
    RootTaskContext getContext() {
      final bool colorEnabled = _args['color'];
      return new RootTaskContext(colorEnabled);
    }
  
  
negative.code:   static ArgParser _getParser() {
      final parser = new ArgParser();
  
      parser.addFlag(_colorParam, defaultsTo: true);
  
  
      // TODO: put help in a const
  