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

class A<X extends core::Object? = dynamic> extends core::Object {
  final field core::String foo;
  synthetic constructor •() → self::A<self::A::X%>
    ;
}
class B<Y extends core::Object? = dynamic> extends self::A<self::B::Y%> {
  final field core::String foo;
  constructor •(core::String foo) → self::B<self::B::Y%>
    ;
}
static method main() → dynamic
  ;