anchor.diff:          }
       }
   }
  -class interleave$$anonymous$0_ implements Iterable {
  +class interleave$$anonymous$0_ implements dart$$Basic, Iterable {
       Sequence $capture$interleave$iterables;
       interleave$$anonymous$0_([Sequence $capture$interleave$iterables]) {
           this.$capture$interleave$iterables = $capture$interleave$iterables;
  
positive.code: 
  DeprecationAnnotation deprecated([$dart$core.Object reason = $package$dart$default]) => $package$deprecated(reason);
  
  class TagsAnnotation implements OptionalAnnotation {
      TagsAnnotation([Sequential tags]) {
          this.tags = tags;
      }
  
negative.code:     Iterable get permutations;
      static Iterable $get$permutations([final Collection $this]) => new Collection$permutations$$anonymous$0_($this);
  }
  class nullElement_ implements dart$$Basic {
      nullElement_() {}
  }
  final nullElement_ $package$nullElement = new nullElement_();
  