Hi Jake Lin, with deinit

when using [unowned self] it is

Create Container
-Start getClosure
Clear Container
deinit
Start Sleep
Finish Sleep
--After async

when using strong self it is

Create Container
-Start getClosure
Clear Container
Start Sleep
Finish Sleep
--After async
---Start runClosure
----Testing Printed!!--
deinit

It’s interesting in the [unowned self] case, it doesn’t crash after --After async