anchor.diff:      var classDecl = new JS.ClassDeclaration(
           new JS.ClassExpression(new JS.Identifier(name), heritage, []));
   
  -    return _finishClassDef(type, classDecl, null);
  +    return _finishClassDef(type, classDecl);
     }
   
     JS.Statement _emitJsType(String dartClassName, DartObjectImpl jsName) {
  
positive.code:       _emitTypeName(node.element.type, lowerTypedef: true)
      ]);
  
      return _finishClassDef(type, result, null);
    }
  
    @override
  
negative.code:     }
      var lazy = _emitLazyFields(new JS.Identifier(name), lazyStatics);
      if (lazy != null) body.add(lazy);
      return _statement(body);
    }
  
  