const runtime.iterator

7 uses

	runtime (current package)
		map.go#L94: 	iterator     = 1 // there may be an iterator using buckets
		map.go#L916: 	if old := h.flags; old&(iterator|oldIterator) != iterator|oldIterator {
		map.go#L917: 		atomic.Or8(&h.flags, iterator|oldIterator)
		map.go#L1151: 	flags := h.flags &^ (iterator | oldIterator)
		map.go#L1152: 	if h.flags&iterator != 0 {
		map.go#L1299: 					if h.flags&iterator != 0 && !t.ReflexiveKey() && !t.Key.Equal(k2, k2) {