(j3.2006) Question about LOCAL_EVENT_TYPE

[Van Snyder]

In Clause 6 of TS 18508, variables of type(EVENT_TYPE) and
type(LOCAL_EVENT_TYPE) are required to be coarrays.  In the EVENT WAIT
statement, C605 prohibits an <event-variable> of type(LOCAL_EVENT_TYPE)
to be coindexed.  Why is it required to be a coarray if it can't be
coindexed?  Why isn't it prohibited to be coindexed in an EVENT POST
statement, or an ALLOCATE or DEALLOCATE statement?