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

class A<X extends core::Object? = dynamic> extends core::Object {
  synthetic constructor •() → self::A<self::A::X%>
    : super core::Object::•()
    ;
  method foo<covariant-by-class Y extends self::A::X%>() → dynamic {}
}
class B extends self::A<dynamic> {
  synthetic constructor •() → self::B
    : super self::A::•()
    ;
}
static method bar(self::B b) → dynamic {
  b.{self::A::foo}<dynamic>(){() → dynamic};
}
static method main() → dynamic {}