Function polkadot_overseer::spawn

pub fn spawn<S, M, TK, Ctx, E, SubSys>(
    spawner: &mut S, 
    message_tx: MeteredSender<MessagePacket<M>>, 
    signal_tx: MeteredSender<OverseerSignal>, 
    unbounded_meter: Meter, 
    ctx: Ctx, 
    s: SubSys, 
    subsystem_name: &'static str, 
    futures: &mut FuturesUnordered<BoxFuture<'static, Result<(), SubsystemError>>>
) -> Result<OverseenSubsystem<M>, SubsystemError> where
    S: SpawnNamed,
    M: Debug + Send + 'static,
    TK: TaskKind,
    Ctx: SubsystemContext<Message = M>,
    E: Error + Send + Sync + 'static + From<OverseerError>,
    SubSys: Subsystem<Ctx, E>, 

Spawn task of kind self using spawner S.