anchor.diff:  part of angular;
   
   class BlockListFactory {
  -  Scope $rootScope;
  -  BlockListFactory(Scope this.$rootScope);
  +  BlockListFactory();
   
     BlockList call(List<dom.Node> elements, Map<String, BlockType> blockTypes, Injector injector) {
  -    return new BlockList($rootScope, elements, blockTypes, injector);
  +    return new BlockList(elements, blockTypes, injector);
     }
   }
   
  
positive.code:  * which allows more blocks to be added.
   */
  class BlockList extends ElementWrapper {
    Scope $rootScope;
    List<dom.Node> elements;
    Map<String, BlockType> blockTypes;
    Injector injector;
  
negative.code:   ElementWrapper previous;
    ElementWrapper next;
  
    BlockList(List<dom.Node> this.elements,
              Map<String, BlockType> this.blockTypes, Injector this.injector) {
    }
  
  