https://gcc.gnu.org/bugzilla/show_bug.cgi?id=121097
--- Comment #5 from Jonathan Wakely <redi at gcc dot gnu.org> --- Sure, we could do, but I'm not convinced it's a real issue, only a hypothetical one. Your config seems self-inflicted, due to an incomplete emulation of GCC 10 (which did define __cpp_fold_expressions).
