anchor.diff:   */
   class ContextInfo {
     /**
  +   * The [ContextManager] which is tracking this information.
  +   */
  +  final ContextManagerImpl contextManager;
  +
  +  /**
      * The [Folder] for which this information object is created.
      */
     final Folder folder;
  
positive.code:   }
  
    /**
     * Compute the appropriate [FolderDisposition] for [folder], and store
     * dependency information in [info].
     */
    FolderDisposition _computeFolderDisposition(Folder folder, ContextInfo info) {
      _cancelDependencySubscriptions(info);
      if (info.packageRoot != null) {
        info.packageMapInfo = null;
        // TODO(paulberry): We shouldn't be using JavaFile here because it
        // makes the code untestable (see dartbug.com/23909).
        JavaFile packagesDir = new JavaFile(info.packageRoot);
  
negative.code:    * [ContextInfo]s.
     */
    ContextInfo._root()
        : contextManager = null,
          folder = null,
          pathFilter = null;
  
    /**
  