const runtime.iterator

7 uses

	runtime (current package)
		map.go#L102: 	iterator     = 1 // there may be an iterator using buckets
		map.go#L860: 	if old := h.flags; old&(iterator|oldIterator) != iterator|oldIterator {
		map.go#L861: 		atomic.Or8(&h.flags, iterator|oldIterator)
		map.go#L1070: 	flags := h.flags &^ (iterator | oldIterator)
		map.go#L1071: 	if h.flags&iterator != 0 {
		map.go#L1213: 					if h.flags&iterator != 0 && !t.ReflexiveKey() && !t.Key.Equal(k2, k2) {

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