anchor.diff:  
     ContextInfo(ContextManagerImpl contextManager, this.parent, Folder folder,
         File packagespecFile, this.packageRoot)
  -      : contextManager = contextManager,
  -        folder = folder,
  +      : folder = folder,
           pathFilter = new PathFilter(
               folder.path, null, contextManager.resourceProvider.pathContext) {
       packageDescriptionPath = packagespecFile.path;
  
positive.code:  */
  class ContextInfo {
    /**
     * The [ContextManager] which is tracking this information.
     */
    final ContextManagerImpl contextManager;
  
    /**
     * The [Folder] for which this information object is created.
     */
    final Folder folder;
  
negative.code:    * [ContextInfo]s.
     */
    ContextInfo._root()
        : folder = null,
          pathFilter = null;
  
    /**
  