https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91383
--- Comment #2 from Frédéric Bron <ufospoke at gmail dot com> --- I agree that in C++14, they should be marked deprecated. But the features have been removed in C++17. They are not deprecated anymore, so in my opinion, they should not be available with -std=c++17.
