anchor.diff:      inlineSyntaxes: markdownSyntaxes);
     return contents;
   }
  -
   
   List<String> _listLibraries(List<String> args) {
     var libraries = new List<String>();
  
positive.code:   var packageName = _packageName(pubspec);
    if (library != null) {
      library.packageName = packageName;
      // If we are the main library in a package, associate the package readme
      // with us.
      // TODO(alanknight): We can't really rely on all packages having a library
      // that matches the package name. Need a better way to store this.
      if (library.packageName == library.name) {
        library.packageIntro = _packageIntro(rootdir);
      }
    }
    return packageName;
  }
  
negative.code:   ClassGroup classes;
  
    String packageName = '';
    bool hasBeenCheckedForPackage = false;
  
    String get packagePrefix => packageName == null || packageName.isEmpty
        ? ''
  