| Index: pkg/compiler/lib/src/serialization/element_serialization.dart | 
| diff --git a/pkg/compiler/lib/src/serialization/element_serialization.dart b/pkg/compiler/lib/src/serialization/element_serialization.dart | 
| index 0e5c562fc1340392372c47992c9b34b830bbd65b..5fa61a0fbd8413a1585ffe0d1c6d1fabf5c0600b 100644 | 
| --- a/pkg/compiler/lib/src/serialization/element_serialization.dart | 
| +++ b/pkg/compiler/lib/src/serialization/element_serialization.dart | 
| @@ -102,8 +102,8 @@ abstract class ElementSerializer { | 
|  | 
| /// Serializes [element] into the [encoder] using the [kind] computed | 
| /// by [getSerializedKind]. | 
| -  void serialize( | 
| -      Element element, ObjectEncoder encoder, SerializedElementKind kind); | 
| +  void serialize(covariant Element element, ObjectEncoder encoder, | 
| +      SerializedElementKind kind); | 
| } | 
|  | 
| class SerializerUtil { | 
|  |