library /*isNonNullableByDefault*/;
import self as self;
import "dart:core" as core;

class A extends core::Object {
  synthetic constructor •() → self::A
    ;
}
abstract class B<invariant X extends core::Object? = dynamic, Y extends core::Object? = dynamic, contravariant Z extends core::Object? = dynamic> extends self::A /*isMixinDeclaration*/  {
}
static method main() → dynamic
  ;