if iscoroutinefunction(_impartial(dunder_call)) or iscoroutinefunction(
            _unwrapped_call(dunder_call)
        ):
            return True
        dunder_unwrapped_call = getattr(_unwrapped_call(self.call), "__call__", None)  # noqa: B004
        if dunder_unwrapped_call is None:
            return False  # pragma: no cover
        if iscoroutinefunction(

def websocket_session(
    func: Callable[[WebSocket], Awaitable[None]],
) -> ASGIApp:
    """
    Takes a coroutine `func(session)`, and returns an ASGI application.
    """
    # assert asyncio.iscoroutinefunction(func), "WebSocket endpoints must be async"

    async def app(scope: Scope, receive: Receive, send: Send) -> None:
        session = WebSocket(scope, receive=receive, send=send)