message: Fix shadow-uncaptured-local warning
diff: @@ -183,8 +183,8 @@ std::string to_string(ipv6_address x) {
  // Output buffer.
  std::string result;
  // Utility for appending chunks to the result.
  - auto add_chunk = [&](uint16_t x) {
  - append_v6_hex(result, reinterpret_cast<uint8_t*>(&x));
  + auto add_chunk = [&](uint16_t chunk) {
  + append_v6_hex(result, reinterpret_cast<uint8_t*>(&chunk));
  };
  auto add_chunks = [&](u16_iterator i, u16_iterator e) {
  if (i != e) {
  