https://gcc.gnu.org/bugzilla/show_bug.cgi?id=127252
--- Comment #5 from Jakub Jelinek <jakub at gcc dot gnu.org> --- Why? __remove_cv etc. is just an implementation detail how to implement std::remove_cv/std::remove_cv_t. That is what user code should be using. And, if you want to remove cv, you can also use remove_cv (^^const int).
