anchor.diff:          help: 'display commandline help options',
           negatable: false,
           callback: (bool value) => value ? printUsage() : null
  -        );
  -
  +        )
       ..addOption(
           'remote-streamy-location',
           help: 'Remote to a git Streamy repository. If specified the remote '
                 'version will be used instead of pub version.',
           callback: (String value) {
             if (localStreamyLocation != null && !isBlank(value)) {
  -            errors.add('cannot set remote-streamy-location if '
  -                       'local-streamy-location is already set');
  +            errors.add(locataionErrorMessage);
               return;
             }
             remoteStreamyLocation = value;
  
positive.code: }
  
  void parseArgs(List<String> arguments) {
    var errors = <String>[];
    var argp = new ArgParser();
  
  
negative.code:               'version will be used instead of pub version.',
          callback: (String value) {
            if (remoteStreamyLocation != null && !isBlank(value)) {
              errors.add(locataionErrorMessage);
              return;
            }
            localStreamyLocation = value;
  