return item1, item2  # pragma: nocover

    @sub_router.post(
        "/subrouter",
        response_model=list[Item],
        responses={404: {"model": list[Message]}},
    )
    def post_subrouter(item1: Item, item2: Item):
        return item1, item2  # pragma: nocover

    router.include_router(sub_router)
    app.include_router(router, generate_unique_id_function=custom_generate_unique_id3)

  }

  private abstract static class ToReproduceGenericSignatureFormatError<V> {
    private abstract class BaseOuter {
      abstract class BaseInner {}
    }

    private abstract class SubOuter extends BaseOuter {
      private abstract class SubInner extends BaseInner {}
    }
  }

  // For Guava bug https://github.com/google/guava/issues/1025