ExperimentalCoroutineDispatcher fails to close

[cy6erGn0m]

I get KNPE when attempting to close dispatcher

Caused by: kotlin.KotlinNullPointerException
	at kotlinx.coroutines.scheduling.CoroutineScheduler.shutdown(CoroutineScheduler.kt:307)
	at kotlinx.coroutines.scheduling.CoroutineScheduler.close(CoroutineScheduler.kt:295)
	at kotlinx.coroutines.scheduling.ExperimentalCoroutineDispatcher.close(Dispatcher.kt:70)

This is very special case that happens when a SecurityManager was introduced and tried to touch a dispatcher under thread creation restriction, it tried to launch a new worker and then failed due to security restrictions. So after that coroutineScheduler reference remains null.

I'd say the expected behaviour is to fail to dispatch but no-op at close