anchor.diff:      })();
       $dart$core.int get size => $outer$ceylon$language$Map.size + $capture$Map$patch$other.keys.count($package$not(new dart$Callable(([$dart$core.Object $0]) => $ceylonBoolean($outer$ceylon$language$Map.defines($0)))));
       Iterator iterator() => new ChainedIterator($capture$Map$patch$other, $outer$ceylon$language$Map.filter($package$not(new dart$Callable(([$dart$core.Object $0]) => $ceylonBoolean($capture$Map$patch$other.contains($0))))));
  -    $dart$core.bool operator ==($dart$core.Object that) => Map.$equals(this, that);
  -    $dart$core.int get hashCode => Map.$get$hashCode(this);
  -    $dart$core.String toString() => Collection.$get$string(this);
       Iterable defaultNullElements([$dart$core.Object defaultValue]) => Map.$defaultNullElements(this, defaultValue);
       Collection get keys => Map.$get$keys(this);
       Collection get items => Map.$get$items(this);
       Map inverse() => Map.$inverse(this);
  +    $dart$core.bool operator ==($dart$core.Object that) => Map.$equals(this, that);
  +    $dart$core.int get hashCode => Map.$get$hashCode(this);
       Map mapItems([Callable mapping]) => Map.$mapItems(this, mapping);
       Map defaultNullItems([$dart$core.Object defaultValue]) => Map.$defaultNullItems(this, defaultValue);
       Map filterKeys([Callable filtering]) => Map.$filterKeys(this, filtering);
  
positive.code:             return $package$empty;
          }
      }
      $dart$core.bool operator ==($dart$core.Object that) => List.$equals(this, that);
      $dart$core.int get hashCode => List.$get$hashCode(this);
      $dart$core.String toString() => Sequence.$get$string(this);
      $dart$core.bool get empty => Sequence.$get$empty(this);
      $dart$core.int get lastIndex => Sequence.$get$lastIndex(this);
      Range get keys => Sequence.$get$keys(this);
  
negative.code:     Sequential measure([Integer from, $dart$core.int length]) => Sequence.$measure(this, from, length);
      Sequential span([Integer from, Integer to]) => Sequence.$span(this, from, to);
      Sequential spanTo([Integer to]) => Sequence.$spanTo(this, to);
      $dart$core.String toString() => Sequence.$get$string(this);
      Sequential initial([$dart$core.int length]) => Sequential.$initial(this, length);
      Sequential terminal([$dart$core.int length]) => Sequential.$terminal(this, length);
      Sequential trim([Callable trimming]) => Sequential.$trim(this, trimming);
  