|  | library; | 
|  | // | 
|  | // Problems in library: | 
|  | // | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:41:7: Error: The non-abstract class 'ConcreteSub' is missing implementations for these members: | 
|  | //  - Interface1.extendedAbstractCovariantImplementedField | 
|  | //  - Interface1.extendedAbstractImplementedCovariantField | 
|  | //  - Interface1.implementsMultipleCovariantField1 | 
|  | //  - Interface1.implementsMultipleCovariantField2 | 
|  | //  - Interface2.implementsMultipleCovariantField1 | 
|  | //  - Interface2.implementsMultipleCovariantField2 | 
|  | //  - Super.extendedAbstractCovariantField | 
|  | //  - Super.extendedAbstractCovariantField= | 
|  | //  - Super.extendedAbstractCovariantImplementedField | 
|  | //  - Super.extendedAbstractCovariantImplementedField= | 
|  | //  - Super.extendedAbstractImplementedCovariantField | 
|  | //  - Super.extendedAbstractImplementedCovariantField= | 
|  | // Try to either | 
|  | //  - provide an implementation, | 
|  | //  - inherit an implementation from a superclass or mixin, | 
|  | //  - mark the class as abstract, or | 
|  | //  - provide a 'noSuchMethod' implementation. | 
|  | // | 
|  | // class ConcreteSub extends AbstractClass {} | 
|  | //       ^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:22:7: Context: 'Interface1.extendedAbstractCovariantImplementedField' is defined here. | 
|  | //   int extendedAbstractCovariantImplementedField = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:26:17: Context: 'Interface1.extendedAbstractImplementedCovariantField' is defined here. | 
|  | //   covariant int extendedAbstractImplementedCovariantField = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:28:17: Context: 'Interface1.implementsMultipleCovariantField1' is defined here. | 
|  | //   covariant int implementsMultipleCovariantField1 = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:30:7: Context: 'Interface1.implementsMultipleCovariantField2' is defined here. | 
|  | //   int implementsMultipleCovariantField2 = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:34:7: Context: 'Interface2.implementsMultipleCovariantField1' is defined here. | 
|  | //   int implementsMultipleCovariantField1 = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:36:17: Context: 'Interface2.implementsMultipleCovariantField2' is defined here. | 
|  | //   covariant int implementsMultipleCovariantField2 = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:8:26: Context: 'Super.extendedAbstractCovariantField' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:8:26: Context: 'Super.extendedAbstractCovariantField=' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:12:26: Context: 'Super.extendedAbstractCovariantImplementedField' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantImplementedField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:12:26: Context: 'Super.extendedAbstractCovariantImplementedField=' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantImplementedField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:16:16: Context: 'Super.extendedAbstractImplementedCovariantField' is defined here. | 
|  | //   abstract int extendedAbstractImplementedCovariantField; | 
|  | //                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:16:16: Context: 'Super.extendedAbstractImplementedCovariantField=' is defined here. | 
|  | //   abstract int extendedAbstractImplementedCovariantField; | 
|  | //                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:43:7: Error: The non-abstract class 'ConcreteClass' is missing implementations for these members: | 
|  | //  - Interface1.extendedAbstractCovariantImplementedField | 
|  | //  - Interface1.extendedAbstractImplementedCovariantField | 
|  | //  - Interface1.implementsMultipleCovariantField1 | 
|  | //  - Interface1.implementsMultipleCovariantField2 | 
|  | //  - Interface2.implementsMultipleCovariantField1 | 
|  | //  - Interface2.implementsMultipleCovariantField2 | 
|  | //  - Super.extendedAbstractCovariantField | 
|  | //  - Super.extendedAbstractCovariantField= | 
|  | //  - Super.extendedAbstractCovariantImplementedField | 
|  | //  - Super.extendedAbstractCovariantImplementedField= | 
|  | //  - Super.extendedAbstractImplementedCovariantField | 
|  | //  - Super.extendedAbstractImplementedCovariantField= | 
|  | // Try to either | 
|  | //  - provide an implementation, | 
|  | //  - inherit an implementation from a superclass or mixin, | 
|  | //  - mark the class as abstract, or | 
|  | //  - provide a 'noSuchMethod' implementation. | 
|  | // | 
|  | // class ConcreteClass extends Super implements Interface1, Interface2 {} | 
|  | //       ^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:22:7: Context: 'Interface1.extendedAbstractCovariantImplementedField' is defined here. | 
|  | //   int extendedAbstractCovariantImplementedField = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:26:17: Context: 'Interface1.extendedAbstractImplementedCovariantField' is defined here. | 
|  | //   covariant int extendedAbstractImplementedCovariantField = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:28:17: Context: 'Interface1.implementsMultipleCovariantField1' is defined here. | 
|  | //   covariant int implementsMultipleCovariantField1 = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:30:7: Context: 'Interface1.implementsMultipleCovariantField2' is defined here. | 
|  | //   int implementsMultipleCovariantField2 = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:34:7: Context: 'Interface2.implementsMultipleCovariantField1' is defined here. | 
|  | //   int implementsMultipleCovariantField1 = 0; | 
|  | //       ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:36:17: Context: 'Interface2.implementsMultipleCovariantField2' is defined here. | 
|  | //   covariant int implementsMultipleCovariantField2 = 0; | 
|  | //                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:8:26: Context: 'Super.extendedAbstractCovariantField' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:8:26: Context: 'Super.extendedAbstractCovariantField=' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:12:26: Context: 'Super.extendedAbstractCovariantImplementedField' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantImplementedField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:12:26: Context: 'Super.extendedAbstractCovariantImplementedField=' is defined here. | 
|  | //   abstract covariant int extendedAbstractCovariantImplementedField; | 
|  | //                          ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:16:16: Context: 'Super.extendedAbstractImplementedCovariantField' is defined here. | 
|  | //   abstract int extendedAbstractImplementedCovariantField; | 
|  | //                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // pkg/front_end/testcases/general/hierarchy/forwarding_stubs_field.dart:16:16: Context: 'Super.extendedAbstractImplementedCovariantField=' is defined here. | 
|  | //   abstract int extendedAbstractImplementedCovariantField; | 
|  | //                ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ | 
|  | // | 
|  | import self as self; | 
|  | import "dart:core" as core; | 
|  |  | 
|  | abstract class Super extends core::Object { | 
|  | covariant-by-declaration field core::int extendedConcreteCovariantField = 0; | 
|  | covariant-by-declaration field core::int extendedConcreteCovariantImplementedField = 0; | 
|  | field core::int extendedConcreteImplementedCovariantField = 0; | 
|  | synthetic constructor •() → self::Super | 
|  | : super core::Object::•() | 
|  | ; | 
|  | abstract get extendedAbstractCovariantField() → core::int; | 
|  | abstract set extendedAbstractCovariantField(covariant-by-declaration synthesized core::int #externalFieldValue) → void; | 
|  | abstract get extendedAbstractCovariantImplementedField() → core::int; | 
|  | abstract set extendedAbstractCovariantImplementedField(covariant-by-declaration synthesized core::int #externalFieldValue) → void; | 
|  | abstract get extendedAbstractImplementedCovariantField() → core::int; | 
|  | abstract set extendedAbstractImplementedCovariantField(synthesized core::int #externalFieldValue) → void; | 
|  | } | 
|  | class Interface1 extends core::Object { | 
|  | field core::int extendedConcreteCovariantImplementedField = 0; | 
|  | field core::int extendedAbstractCovariantImplementedField = 0; | 
|  | covariant-by-declaration field core::int extendedConcreteImplementedCovariantField = 0; | 
|  | covariant-by-declaration field core::int extendedAbstractImplementedCovariantField = 0; | 
|  | covariant-by-declaration field core::int implementsMultipleCovariantField1 = 0; | 
|  | field core::int implementsMultipleCovariantField2 = 0; | 
|  | synthetic constructor •() → self::Interface1 | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } | 
|  | class Interface2 extends core::Object { | 
|  | field core::int implementsMultipleCovariantField1 = 0; | 
|  | covariant-by-declaration field core::int implementsMultipleCovariantField2 = 0; | 
|  | synthetic constructor •() → self::Interface2 | 
|  | : super core::Object::•() | 
|  | ; | 
|  | } | 
|  | abstract class AbstractClass extends self::Super implements self::Interface1, self::Interface2 { | 
|  | synthetic constructor •() → self::AbstractClass | 
|  | : super self::Super::•() | 
|  | ; | 
|  | forwarding-stub set extendedConcreteImplementedCovariantField(covariant-by-declaration core::int value) → void | 
|  | return super.{self::Super::extendedConcreteImplementedCovariantField} = value; | 
|  | abstract forwarding-stub set extendedAbstractImplementedCovariantField(covariant-by-declaration core::int #externalFieldValue) → void; | 
|  | abstract forwarding-stub set implementsMultipleCovariantField2(covariant-by-declaration core::int value) → void; | 
|  | } | 
|  | class ConcreteSub extends self::AbstractClass { | 
|  | synthetic constructor •() → self::ConcreteSub | 
|  | : super self::AbstractClass::•() | 
|  | ; | 
|  | } | 
|  | class ConcreteClass extends self::Super implements self::Interface1, self::Interface2 { | 
|  | synthetic constructor •() → self::ConcreteClass | 
|  | : super self::Super::•() | 
|  | ; | 
|  | forwarding-stub set extendedConcreteImplementedCovariantField(covariant-by-declaration core::int value) → void | 
|  | return super.{self::Super::extendedConcreteImplementedCovariantField} = value; | 
|  | abstract forwarding-stub set extendedAbstractImplementedCovariantField(covariant-by-declaration core::int #externalFieldValue) → void; | 
|  | abstract forwarding-stub set implementsMultipleCovariantField2(covariant-by-declaration core::int value) → void; | 
|  | } | 
|  | static method main() → dynamic {} |