Function mustbe_deferred

scrapy/utils/defer.py:126–128

(
    f: Callable[_P, Deferred[_T]], *args: _P.args, **kw: _P.kwargs
)

@overload
def mustbe_deferred(
    f: Callable[_P, Deferred[_T]], *args: _P.args, **kw: _P.kwargs
) -> Deferred[_T]: ...


@overload