anchor.diff:      inlineSyntaxes: markdownSyntaxes);
     return contents;
   }
  -
   
   List<String> _listLibraries(List<String> args) {
     var libraries = new List<String>();
  
positive.code: /// If [library] is specified, we set the packageName field. If no package could
  /// be determined, we return an empty string.
  String _findPackage(LibraryMirror mirror, [Library library]) {
    if (mirror.uri.scheme != 'file') return '';
    var filePath = mirror.uri.toFilePath();
    // We assume that we are documenting only libraries under package/lib
  
negative.code:   ClassGroup classes;
  
    String packageName = '';
    bool hasBeenCheckedForPackage = false;
  
    String get packagePrefix => packageName == null || packageName.isEmpty
        ? ''
  