func mergedAddresses(machineAddresses, providerAddresses []address) []instance.Address {
merged := make([]instance.Address, len(providerAddresses), len(providerAddresses)+len(machineAddresses))
var providerValues set.Strings
for i, address := range providerAddresses {
providerValues.Add(address.Value)
merged[i] = address.InstanceAddress()
}
for _, address := range machineAddresses {
if !providerValues.Contains(address.Value) {
merged = append(merged, address.InstanceAddress())
}
}
return merged
}
