anchor.diff:  /// [docs]: docs/guide/lifecycle-hooks.html#ondestroy
   /// [ex]: examples/lifecycle-hooks#spy
   abstract class OnDestroy {
  -  ngOnDestroy();
  +  void ngOnDestroy();
   }
   
   /// Implement this interface to get notified when your directive's content has
  
positive.code: /// [docs]: docs/guide/lifecycle-hooks.html#onchanges
  /// [ex]: examples/lifecycle-hooks#onchanges
  abstract class OnChanges {
    ngOnChanges(Map<String, SimpleChange> changes);
  }
  
  /// Implement this interface to execute custom initialization logic after your
  
negative.code: /// [docs]: docs/guide/lifecycle-hooks.html#afterview
  /// [ex]: examples/lifecycle-hooks#after-view
  abstract class AfterViewInit {
    void ngAfterViewInit();
  }
  
  /// Implement this interface to get notified after every check of your
  