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