@ExperimentalCoroutinesApi fun <E : Any> ReceiveChannel<E>.onReceiveOrNull(): SelectClause1<E?>(source)
Clause for select expression of receiveOrNull suspending function that selects with the element that
is received from the channel or selects with
null if the channel
isClosedForReceive without cause. The select invocation fails with
the original close cause exception if the channel has failed.
This extension is defined only for channels on non-null types, so that generic functions defined using
these extensions do not accidentally confuse
null value and a normally closed channel, leading to hard
to find bugs.