| // | 
 | // Problems in component: | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart:27:7: Error: 'LegacyClass5' can't implement both 'GenericInterface<dynamic>' and 'GenericInterface<Object>' | 
 | //  - 'GenericInterface' is from 'pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in_lib.dart'. | 
 | //  - 'Object' is from 'dart:core'. | 
 | // class LegacyClass5 extends Class5 implements GenericInterface<Object> {} | 
 | //       ^ | 
 | // | 
 | library; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart:21:52: Error: Null safety features are disabled for this library. | 
 | // Try removing the `@dart=` annotation or setting the language version to 2.10 or higher. | 
 | // class LegacyClass4c implements GenericInterface<num?> {} | 
 | //                                                    ^ | 
 | // pkg/front_end/testcases/nnbd_mixed/inheritance_from_opt_in.dart:5:1: Context: This is the annotation that opts out this library from null safety features. | 
 | // // @dart=2.5 | 
 | // ^^^^^^^^^^^^ | 
 | // | 
 | import self as self; | 
 | import "inheritance_from_opt_in_lib.dart" as inh; | 
 | import "dart:core" as core; | 
 |  | 
 | import "org-dartlang-testcase:///inheritance_from_opt_in_lib.dart"; | 
 |  | 
 | class LegacyClass1 extends inh::Class1 { | 
 |   synthetic constructor •() → self::LegacyClass1* | 
 |     : super inh::Class1::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass2<T extends core::Object* = dynamic> extends inh::Class2<self::LegacyClass2::T*> { | 
 |   synthetic constructor •() → self::LegacyClass2<self::LegacyClass2::T*>* | 
 |     : super inh::Class2::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass3a<T extends core::Object* = dynamic> extends inh::Class3<self::LegacyClass3a::T*> { | 
 |   synthetic constructor •() → self::LegacyClass3a<self::LegacyClass3a::T*>* | 
 |     : super inh::Class3::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass3b<T extends core::Object* = dynamic> extends inh::Class3<self::LegacyClass3b::T*> implements inh::GenericInterface<self::LegacyClass3b::T*> { | 
 |   synthetic constructor •() → self::LegacyClass3b<self::LegacyClass3b::T*>* | 
 |     : super inh::Class3::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass4a extends inh::Class4a { | 
 |   synthetic constructor •() → self::LegacyClass4a* | 
 |     : super inh::Class4a::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass4b extends core::Object implements inh::GenericInterface<core::num*> { | 
 |   synthetic constructor •() → self::LegacyClass4b* | 
 |     : super core::Object::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass4c extends core::Object implements inh::GenericInterface<core::num?> { | 
 |   synthetic constructor •() → self::LegacyClass4c* | 
 |     : super core::Object::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass4d extends inh::Class4a implements inh::GenericInterface<core::num*> { | 
 |   synthetic constructor •() → self::LegacyClass4d* | 
 |     : super inh::Class4a::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass4e extends core::Object implements inh::Class4a, inh::Class4b { | 
 |   synthetic constructor •() → self::LegacyClass4e* | 
 |     : super core::Object::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass5 extends inh::Class5 implements inh::GenericInterface<core::Object*> { | 
 |   synthetic constructor •() → self::LegacyClass5* | 
 |     : super inh::Class5::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass6a<T extends core::Object* = dynamic> extends inh::Class3<self::LegacyClass6a::T*> implements inh::GenericSubInterface<self::LegacyClass6a::T*> { | 
 |   synthetic constructor •() → self::LegacyClass6a<self::LegacyClass6a::T*>* | 
 |     : super inh::Class3::•() | 
 |     ; | 
 |   abstract member-signature get _identityHashCode() → core::int*; -> core::Object::_identityHashCode | 
 |   abstract member-signature method _instanceOf(dynamic instantiatorTypeArguments, dynamic functionTypeArguments, dynamic type) → core::bool*; -> core::Object::_instanceOf | 
 |   abstract member-signature method _simpleInstanceOf(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOf | 
 |   abstract member-signature method _simpleInstanceOfTrue(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfTrue | 
 |   abstract member-signature method _simpleInstanceOfFalse(dynamic type) → core::bool*; -> core::Object::_simpleInstanceOfFalse | 
 |   abstract member-signature operator ==(dynamic other) → core::bool*; -> core::Object::== | 
 |   abstract member-signature get hashCode() → core::int*; -> core::Object::hashCode | 
 |   abstract member-signature method toString() → core::String*; -> core::Object::toString | 
 |   abstract member-signature method noSuchMethod(core::Invocation* invocation) → dynamic; -> core::Object::noSuchMethod | 
 |   abstract member-signature get runtimeType() → core::Type*; -> core::Object::runtimeType | 
 | } | 
 | class LegacyClass6b<T extends core::Object* = dynamic> extends self::LegacyClass3a<self::LegacyClass6b::T*> implements inh::GenericSubInterface<self::LegacyClass6b::T*> { | 
 |   synthetic constructor •() → self::LegacyClass6b<self::LegacyClass6b::T*>* | 
 |     : super self::LegacyClass3a::•() | 
 |     ; | 
 | } | 
 |  | 
 | library /*isNonNullableByDefault*/; | 
 | import self as inh; | 
 | import "dart:core" as core; | 
 |  | 
 | abstract class GenericInterface<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → inh::GenericInterface<inh::GenericInterface::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | abstract class GenericSubInterface<T extends core::Object? = dynamic> extends inh::GenericInterface<inh::GenericSubInterface::T%> { | 
 |   synthetic constructor •() → inh::GenericSubInterface<inh::GenericSubInterface::T%> | 
 |     : super inh::GenericInterface::•() | 
 |     ; | 
 | } | 
 | class Class1 extends core::Object { | 
 |   synthetic constructor •() → inh::Class1 | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | class Class2<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → inh::Class2<inh::Class2::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | class Class3<T extends core::Object? = dynamic> extends core::Object implements inh::GenericInterface<inh::Class3::T%> { | 
 |   synthetic constructor •() → inh::Class3<inh::Class3::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | class Class4a extends core::Object implements inh::GenericInterface<core::num> { | 
 |   synthetic constructor •() → inh::Class4a | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | class Class4b extends core::Object implements inh::GenericInterface<core::num?> { | 
 |   synthetic constructor •() → inh::Class4b | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | class Class5 extends core::Object implements inh::GenericInterface<dynamic> { | 
 |   synthetic constructor •() → inh::Class5 | 
 |     : super core::Object::•() | 
 |     ; | 
 | } |