anchor.diff:    }
   
     /**
  -   * Throw away any information produced by a previous call to [link].
  +   * Throw away any information stored in the summary by a previous call to
  +   * [link].
      */
     void unlink() {
       for (LibraryElementInBuildUnit library in _librariesInBuildUnit) {
  
positive.code: 
    @override
    noSuchMethod(Invocation invocation) => super.noSuchMethod(invocation);
  
    /**
     * Throw away any information produced by a previous call to [link].
     */
    void unlink();
  }
  
  /**
  
negative.code:   void link(CompilationUnitElementInBuildUnit compilationUnit) {
      compilationUnit._storeLinkedType(
          unlinkedVariable.inferredTypeSlot, _inferredType, enclosingElement);
    }
  }
  
  