anchor.diff:      return sw;
   })();
   
  -class system_ {
  +class system_ implements dart$$Basic {
   
     $dart$core.int get milliseconds
         =>  new $dart$core.DateTime.now().millisecondsSinceEpoch;
  
positive.code: // Integer.dart
  //
  
  class Integer implements Integral, Exponentiable, Binary {
    final $dart$core.int _value;
  
    static $dart$core.int twoFiftyThree = 1<<53;
  
negative.code: //
  ///////////////////////////////////////
  
  class serialization$NativeDeque implements dart$$Basic {
    void pushFront(element) {}
    void pushBack(element) {}
    popFront() {}
  