library;
import self as self;
import "dart:core" as core;

class B<X extends core::Object* = dynamic, Y extends core::Object* = dynamic> extends core::Object {
  synthetic constructor •() → self::B<self::B::X*, self::B::Y*>*
    ;
}
class C<X extends core::Object* = dynamic, Y extends core::Object* = dynamic> extends core::Object {
  synthetic constructor •() → self::C<self::C::X*, self::C::Y*>*
    ;
}
class D<X extends self::B<self::D::X*, self::D::Y*>* = self::B<dynamic, dynamic>*, Y extends self::C<self::D::X*, self::D::Y*>* = self::C<dynamic, dynamic>*, Z extends (self::D::Y*) →* self::D::X* = (core::Null?) →* self::B<dynamic, dynamic>*, W extends core::num* = core::num*> extends core::Object {
  synthetic constructor •() → self::D<self::D::X*, self::D::Y*, self::D::Z*, self::D::W*>*
    ;
}
static method main() → dynamic
  ;