func (i ItemType) isSetOperator() bool {
	switch i {
	case ItemLAND, ItemLOR, ItemLUnless:
		return true
	}
	return false
}
func (i ItemType) isSetOperator() bool {
	switch i {
	case ItemLAND, ItemLOR, ItemLUnless:
		return true
	}
	return false
}
func ( i ItemType ) isSetOperator ( ) bool { switch i { case ItemLAND , ItemLOR , ItemLUnless : return true } return false }
// isSetOperator returns whether the item corresponds to a set operator.
isSetOperator returns whether the item corresponds to a set operator .