)


def check_file_field(field: ModelField) -> None:
    field_info = field.field_info
    if isinstance(field_info, params.Form):
        try:
            # __version__ is available in both multiparts, and can be mocked
            from multipart import __version__  # type: ignore

            assert __version__
            try:
                # parse_options_header is only available in the right multipart

                name = getattr(r, "name", "unknown")
                if path is not None and not path:
                    raise FastAPIError(
                        f"Prefix and path cannot be both empty (path operation: {name})"
                    )
        if responses is None:
            responses = {}
        for route in router.routes:
            if isinstance(route, APIRoute):