anchor.diff:          return new dart$Callable(step$3$33);
       }));
       Iterable narrow();
  -    static Iterable $narrow([final Iterable $this]) => functionIterable(new dart$Callable(() {
  +    static Iterable $narrow([final Iterable $this]) => dart$functionIterable(new dart$Callable(() {
           $dart$core.bool step$0$expired$34 = false;
           $dart$core.bool step$0$35() {
               if (step$0$expired$34) {
  
positive.code:         return $dartInt($package$min(arg$0$0) as Integer);
      })() * $capture$interleave$iterables.size;
      $dart$core.bool get empty => (() {
          Iterable arg$9$0 = functionIterable(new dart$Callable(() {
              $dart$core.bool step$0$expired$10 = false;
              $dart$core.bool step$0$11() {
                  if (step$0$expired$10) {
  
negative.code:     Iterable flatMap([Callable collecting]);
      static Iterable $flatMap([final Iterable $this, Callable collecting]) => $package$expand($this.map(collecting));
      Iterable filter([Callable selecting]);
      static Iterable $filter([final Iterable $this, Callable selecting]) => dart$functionIterable(new dart$Callable(() {
          $dart$core.bool step$0$expired$25 = false;
          $dart$core.bool step$0$26() {
              if (step$0$expired$25) {
  