anchor.diff:  
   const $package$operatingSystem = operatingSystem;
   
  +// system
  +
  +class system_ {
  +const system_.$value$();
  +  $dart$core.int get milliseconds
  +      =>  new $dart$core.DateTime.now().millisecondsSinceEpoch;
  +  
  +  $dart$core.int get nanoseconds
  +      =>  new $dart$core.DateTime.now().millisecondsSinceEpoch * 1000000;
  +
  +  $dart$core.String toString()
  +      =>  "Dart";
  +}
  +
  +const system = const system_.$value$();
  +
  +const $package$system = system;
  +
   ////////////////////////////////////////////////////////////////////////////////
   //
   // Runtime Package (ceylon.language.dart)
  
positive.code: ///////////////////////////////////////
  
  class Map {}
  
  ///////////////////////////////////////
  //
  
negative.code:   Float times([Float other]) => new Float(this._value * other._value);
  
    Float get negated => new Float(-this._value);
    
    $dart$core.int get integer => this._value.toInt();
    
    Float minus([Float other]) => new Float(this._value - other._value);
  
    Float plus([Float other]) => new Float(this._value + other._value);
  