anchor.diff:        if (packages != null) {
           packageMap = _getPackageMap(packages);
         } else {
  -
           // Fall back to pub list-dir.
   
           PubPackageMapProvider pubPackageMapProvider =
  
positive.code: 
      Map<String, List<fileSystem.Folder>> folderMap =
          new Map<String, List<fileSystem.Folder>>();
      packages.asMap().forEach((String path, Uri uri) {
        folderMap[path] = [PhysicalResourceProvider.INSTANCE.getFolder(uri.path)];
      });
      return folderMap;
    }
  
negative.code: typedef ErrorSeverity _BatchRunnerHandler(List<String> args);
  
  class Driver {
    /// The plugins that are defined outside the `analyzer_cli` package.
    List<Plugin> _userDefinedPlugins = <Plugin>[];
  
  