|  | library; | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | abstract class A extends core::Object { | 
|  | synthetic constructor •() → self::A | 
|  | : super core::Object::•() | 
|  | ; | 
|  | abstract get instanceField() → core::int; | 
|  | abstract set instanceField(synthesized core::int #externalFieldValue) → void; | 
|  | abstract get finalInstanceField() → core::int; | 
|  | abstract get covariantInstanceField() → core::num; | 
|  | abstract set covariantInstanceField(covariant-by-declaration synthesized core::num #externalFieldValue) → void; | 
|  | } | 
|  | abstract class B extends core::Object /*isMixinDeclaration*/  { | 
|  | abstract get instanceField() → core::int; | 
|  | abstract set instanceField(synthesized core::int #externalFieldValue) → void; | 
|  | abstract get finalInstanceField() → core::int; | 
|  | abstract get covariantInstanceField() → core::num; | 
|  | abstract set covariantInstanceField(covariant-by-declaration synthesized core::num #externalFieldValue) → void; | 
|  | } | 
|  | static method main() → dynamic {} |