anchor.diff:      args = args.expand((String arg) => arg.split('=')).toList();
       
       var parser = new ArgParser()
  -      ..addOption('debug', help: 'Debug printing, comma seperated string (block, constraint, ast, name)')
         ..addOption('dart-sdk', help: 'The path to the Dart SDK')
         ..addOption('package-root', abbr: 'p',
             help: 'The path to the package root')
  
positive.code:           defaultsTo: false, negatable: false)
        ..addFlag('enable-enum',
            help: 'Enable support for the proposed enum feature',
            defaultsTo: false, negatable: false, hide: true);
  
      try {
        var results = parser.parse(args);
  
negative.code:   final bool enableEnum;
    
    /** Whether to enable debug printing of block structure. */
    final bool printBlock;
    
    /** Whether to enable debug printing of resolved names. */
    final bool printNameResolving;
    
    /** Whether to enable debug printing of constraint stucture. */
    final bool printConstraints;
    
    /** Whether to enable debug printing of Ast nodes. */
    final bool printAstNodes;
    
  
    /**
  