anchor.diff:    InheritanceManager get inheritanceManager =>
         _inheritanceManager ??= new InheritanceManager(this);
   
  +  @override
  +  LibraryCycleForLink get libraryCycleForLink => LibraryCycleForLink.instance;
  +
     /**
      * If this library already has a dependency in its dependencies table matching
      * [library], return its index.  Otherwise add a new dependency to table and
  
positive.code:   LibraryElementInDependency(
        _Linker linker, Uri absoluteUri, this._linkedLibrary)
        : super(linker, absoluteUri);
  
    @override
    CompilationUnitElementInDependency _makeUnitElement(
  
negative.code: 
    @override
    Element get enclosingElement => null;
  
    /**
     * If this library is part of the build unit being linked, return the library
     * cycle it is part of.  Otherwise return `null`.
     */
    LibraryCycleForLink get libraryCycleForLink;
  
    @override
    List<UnitElement> get units {
  