anchor.diff:              while (step$1$27()) {
                   Integer index = index$25;
                   $dart$core.Object element;
  -                $dart$core.Object tmp$29 = $this.getFromFirst(Integer.nativeValue(index));
  +                $dart$core.Object tmp$29 = $this.getFromFirst(nativeInt(index));
                   if (!(!(null == tmp$29))) {
                       continue;
                   }
  
positive.code:         }
          $dart$core.String oldString = this.toString();
          clear();
          _$delegate.write(String.instance((String.nativeValue(String.instance(oldString).spanTo(Integer.instance(index - 1))) + string) + String.nativeValue(String.instance(oldString).spanFrom(Integer.instance(index)))));
          return this;
      }
      StringBuilder insertCharacter([$dart$core.int index, Character character]) => insert(index, character.toString());
  
negative.code:         $dart$core.int count = 0;
          while ((() {
              $dart$core.int tmp$9 = count;
              count = nativeInt((new Integer(count)).successor);
              return tmp$9;
          })() < size) {
              step.f((() {
  