library test /*isNonNullableByDefault*/;
//
// 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 {}