anchor.diff:  }
   class operatingSystem_ {
       operatingSystem_() {}
  +    $dart$core.String get fileSeparator => "/";
  +    $dart$core.String get pathSeparator => ":";
       $dart$core.String get version => "Unknown";
  +    $dart$core.String get name => "Unknown";
       $dart$core.String get newline => "\n";
  +    $dart$core.String toString() => ((("operating system [" + name) + " / ") + version) + "]";
   }
   final operatingSystem_ $package$operatingSystem = new operatingSystem_();
   
  
positive.code:     $dart$core.String toString();
      static $dart$core.String $get$string([final Resource $this]) => ((("" + $package$className($this)) + "[") + $this.uri) + "]";
  }
  abstract class Scalable {
      $dart$core.Object scale([$dart$core.Object scalar]);
  }
  
negative.code:         if ($dart$core.identical(typeArguments, $package$dart$default)) {
              typeArguments = $package$empty;
          }
          return $this.memberClassApply(throw new AssertionError("Meta expressions not yet supported at 'ClassDeclaration.ceylon: 145:62-145:70'"), typeArguments as Sequential).bind(container).apply(arguments);
      }
      $dart$core.Object getConstructorDeclaration([$dart$core.String name]);
      Sequential constructorDeclarations();
  