anchor.diff:  ///////////////////////////////////////
   
   class Map {}
  +class Span {}
   
   ///////////////////////////////////////
   //
  
positive.code: 
  const $package$operatingSystem = operatingSystem;
  
  ////////////////////////////////////////////////////////////////////////////////
  //
  // Runtime Package (ceylon.language.dart)
  
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);
  