const runtime.iterator

7 uses

	runtime (current package)
		map.go#L100: 	iterator     = 1 // there may be an iterator using buckets
		map.go#L844: 	if old := h.flags; old&(iterator|oldIterator) != iterator|oldIterator {
		map.go#L845: 		atomic.Or8(&h.flags, iterator|oldIterator)
		map.go#L1038: 	flags := h.flags &^ (iterator | oldIterator)
		map.go#L1039: 	if h.flags&iterator != 0 {
		map.go#L1181: 					if h.flags&iterator != 0 && !t.reflexivekey() && !t.key.equal(k2, k2) {