OCCURS-CHECK : FLAGOCCURS-CHECK is a flag or parameter.
This flag is not effective unless FIRST-ORDER-MODE-MS is T. If its
value is T, occurs check in first-order unification is postponed till a
mating is complete.
OCCURS-CHECK takes values of type BOOLEAN.
It belongs to subjects MS91-6 MS89 MS88 MATING-SEARCH .
Its default value is T
Its current value is T.
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