anchor.diff:  
     @$dart$core.override
     String operator +(String other)
  -    =>  new String.withString(_$val + other._$val);
  +    =>  new String.withString(_val + other._val);
   
     @$dart$core.override
     $dart$core.bool operator >(String other)
  -    =>  _$val.compareTo(other._$val) > 0;
  +    =>  _val.compareTo(other._val) > 0;
   
     @$dart$core.override
     $dart$core.bool operator <(String other)
  -    =>  _$val.compareTo(other._$val) < 0;
  +    =>  _val.compareTo(other._val) < 0;
   
     @$dart$core.override
     $dart$core.bool operator >=(String other)
  -    =>  _$val.compareTo(other._$val) >= 0;
  +    =>  _val.compareTo(other._val) >= 0;
   
     @$dart$core.override
     $dart$core.bool operator <=(String other)
  -    =>  _$val.compareTo(other._$val) <= 0;
  +    =>  _val.compareTo(other._val) <= 0;
   }
   
   /////////////////////////////////////////////////
  
positive.code: /////////////////////////////////////////////////
  
  $dart$core.String $dartString(String value)
    =>  value == null ? null : value._$val;
  
  String $ceylonString($dart$core.String value)
    =>  value == null ? null : new String.withString(value);
  
negative.code: /////////////////////////////////////////////////
  
  $dart$core.int $dartInt(Integer value)
    =>  value == null ? null : value._integer;
  
  Integer $ceylonInteger($dart$core.int value)
    =>  value == null ? null : new Integer(value);
  