| library test; | 
 | // | 
 | // Problems in library: | 
 | // | 
 | // pkg/front_end/testcases/general/interface_contravariant_from_class.dart:17:16: Error: Can't use implicitly 'out' variable 'T' in an 'in' position in supertype 'B'. | 
 | // abstract class C<T> extends B<F<T>> implements I<F<T>> {} | 
 | //                ^ | 
 | // | 
 | // pkg/front_end/testcases/general/interface_contravariant_from_class.dart:17:16: Error: Can't use implicitly 'out' variable 'T' in an 'in' position in supertype 'I'. | 
 | // abstract class C<T> extends B<F<T>> implements I<F<T>> {} | 
 | //                ^ | 
 | // | 
 | import self as self; | 
 | import "dart:core" as core; | 
 |  | 
 | typedef F<contravariant T extends core::Object? = dynamic> = (T%) → void; | 
 | class B<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → self::B<self::B::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 |   method f(core::int x) → self::B::T% | 
 |     return throw ""; | 
 | } | 
 | abstract class I<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → self::I<self::I::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 |   abstract method f(core::Object x) → self::I::T%; | 
 | } | 
 | abstract class C<T extends core::Object? = dynamic> extends core::Object { | 
 |   synthetic constructor •() → self::C<self::C::T%> | 
 |     : super core::Object::•() | 
 |     ; | 
 | } | 
 | static method main() → void {} |