type sync.dequeueNil

4 uses

	sync (current package)
		poolqueue.go#L63: type dequeueNil *struct{}
		poolqueue.go#L99: 		val = dequeueNil(nil)
		poolqueue.go#L135: 	if val == dequeueNil(nil) {
		poolqueue.go#L170: 	if val == dequeueNil(nil) {