| Index: sdk/lib/_internal/libraries.dart | 
| diff --git a/sdk/lib/_internal/libraries.dart b/sdk/lib/_internal/libraries.dart | 
| index 2c5891ce14d04b28175936e5adf49f80a61dacab..737069cf8f680262b4be5b842584225a59c4825f 100644 | 
| --- a/sdk/lib/_internal/libraries.dart | 
| +++ b/sdk/lib/_internal/libraries.dart | 
| @@ -30,7 +30,9 @@ const Map<String, LibraryInfo> LIBRARIES = const { | 
| "chrome/dart2js/chrome_dart2js.dart", | 
| category: "Client"), | 
|  | 
| -  "collection": const LibraryInfo("collection/collection.dart"), | 
| +  "collection": const LibraryInfo( | 
| +      "collection/collection.dart", | 
| +      dart2jsPatchPath: "_internal/compiler/implementation/lib/collection_patch.dart"), | 
|  | 
| "core": const LibraryInfo( | 
| "core/core.dart", | 
|  |