| Index: sdk/lib/_internal/lib/js_helper.dart | 
| diff --git a/sdk/lib/_internal/lib/js_helper.dart b/sdk/lib/_internal/lib/js_helper.dart | 
| index b8ba83ba63e183f4d1622427f196983018b5ca7a..bc85822652b308b39fd1f23f2aaa8cea668632fa 100644 | 
| --- a/sdk/lib/_internal/lib/js_helper.dart | 
| +++ b/sdk/lib/_internal/lib/js_helper.dart | 
| @@ -58,6 +58,12 @@ part 'regexp_helper.dart'; | 
| part 'string_helper.dart'; | 
| part 'js_rti.dart'; | 
|  | 
| +class _Patch { | 
| +  const _Patch(); | 
| +} | 
| + | 
| +const _Patch patch = const _Patch(); | 
| + | 
| bool isJsIndexable(var object, var record) { | 
| if (record != null) { | 
| var result = dispatchRecordIndexability(record); | 
|  |