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

class D<X extends () →* void = () →* void> extends core::Object {
  constructor _() → self::D<self::D::X*>*
    : super core::Object::•() {}
  static factory foo<X extends () →* void = dynamic>() → self::D<self::D::foo::X*>*
    return new self::D::_<self::D::foo::X*>();
}
static method main() → dynamic {
  core::print(self::D::foo<() →* void>());
}