anchor.diff:    } else {
       print(generated);
     }
  -
   }
   
   /// Generates rule and rule test stub files
  
positive.code:   var parser = new ArgParser(allowTrailingOptions: true);
  
    parser.addOption('out', abbr: 'o', help: 'Specifies project root.');
    parser.addOption(
        'library',
        abbr: 'l',
        help: 'Specifies lower_underscore rule library name.');
  
    var options;
    try {
  
negative.code:   // Generate test stub
    generateTest(libName, outDir: outDir);
  }
  
  void printUsage(ArgParser parser, [String error]) {
    var message = 'Generates rule stubs.';
  