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

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