Function try_spawn_async 

pub fn try_spawn_async<TFn, TFuture, T>(
    f: TFn,
) -> Result<JoinHandle<T>, SpawnError>
where
    TFn: FnOnce() -> TFuture + Send + 'static,
    TFuture: Future<Output = T> + 'static,
    T: Send + 'static,

Same as spawn_async but captures thread creation failure.