anchor.diff:      Iterable get cycled => Iterable.$get$cycled(this);
       Iterable interpose([$dart$core.Object element, $dart$core.Object step = $package$dart$default]) => Iterable.$interpose(this, element, step);
       Iterable get distinct => Iterable.$get$distinct(this);
  +    Map frequencies() => Iterable.$frequencies(this);
  +    Map tabulate([Callable collecting]) => Iterable.$tabulate(this, collecting);
       Map group([Callable grouping]) => Iterable.$group(this, grouping);
  +    Map summarize([Callable grouping, Callable accumulating]) => Iterable.$summarize(this, grouping, accumulating);
       $dart$core.bool containsEvery([Iterable elements]) => Category.$containsEvery(this, elements);
       $dart$core.bool containsAny([Iterable elements]) => Category.$containsAny(this, elements);
   }
  
positive.code:     Iterable get cycled => Iterable.$get$cycled(this);
      Iterable interpose([$dart$core.Object element, $dart$core.Object step = $package$dart$default]) => Iterable.$interpose(this, element, step);
      Iterable get distinct => Iterable.$get$distinct(this);
      Map group([Callable grouping]) => Iterable.$group(this, grouping);
      $dart$core.bool containsEvery([Iterable elements]) => Category.$containsEvery(this, elements);
      $dart$core.bool containsAny([Iterable elements]) => Category.$containsAny(this, elements);
      $dart$core.bool definesEvery([Iterable keys]) => Correspondence.$definesEvery(this, keys);
  
negative.code:             return new ArraySequence(new Array(list));
          }
      }
  }
  class loop$$anonymous$0_$$anonymous$1_ implements Iterator {
      loop$$anonymous$0_ $outer$ceylon$language$loop$$anonymous$0_;
  