anchor.diff:      Iterator secondIter = secondIterable.iterator();
       $dart$core.Object partial = initial;
       while (true) {
  -        $dart$core.Object first;
  -        $dart$core.Object first$9 = firstIter.next();
  -        if (first$9 is Finished) {
  -            break;
  -        }
  -        first = first$9;
  -        $dart$core.Object second;
  -        $dart$core.Object second$10 = secondIter.next();
  -        if (second$10 is Finished) {
  -            break;
  -        }
  -        second = second$10;
  +        $dart$core.Object first;{
  +            $dart$core.Object first$9 = firstIter.next();
  +            if (first$9 is Finished) {
  +                break;
  +            }
  +            first = first$9;
  +        }
  +        $dart$core.Object second;{
  +            $dart$core.Object second$10 = secondIter.next();
  +            if (second$10 is Finished) {
  +                break;
  +            }
  +            second = second$10;
  +        }
           partial = accumulating.$delegate$(partial, first, second);
       }
       return partial;
  
positive.code:     Iterator firstIter = firstIterable.iterator();
      Iterator secondIter = secondIterable.iterator();
      while (true) {
          $dart$core.Object first;
          $dart$core.Object first$7 = firstIter.next();
          if (first$7 is Finished) {
              break;
          }
          first = first$7;
          $dart$core.Object second;
          $dart$core.Object second$8 = secondIter.next();
          if (second$8 is Finished) {
              break;
          }
          second = second$8;
          if (Boolean.nativeValue(selecting.$delegate$(first, second) as Boolean)) {
              return true;
          }
  
negative.code:     static $dart$core.bool $equals([final Identifiable $this, $dart$core.Object that]) => (() {
          $dart$core.bool doElse$0 = true;
          if (that is Identifiable) {
              Identifiable that$1;
              that$1 = that as Identifiable;
              doElse$0 = false;
              return $dart$core.identical($this, that$1);
          }
  