We get some new warnings which we may want to fix, which are related to using C++17 features:
wallet/wallet.cpp: In member function ‘std::pair<std::map<SaplingOutPoint, SaplingNoteData>, std::map<libzcash::SaplingPaymentAddress, libzcash::SaplingIncomingViewingKey> > CWallet::FindMySaplingNotesAsync(const CTransaction&, int) const’:
wallet/wallet.cpp:1865:22: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
for (const auto& [ivk, fvk] : mapSaplingFullViewingKeys)
^
wallet/wallet.cpp:1870:22: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
for (const auto& [address, ivk] : mapSaplingIncomingViewingKeys)
^
wallet/wallet.cpp:1901:23: warning: decomposition declaration only available with -std=c++1z or -std=gnu++1z
for (auto [address, ivk] : result_pair.second)
^