https://gcc.gnu.org/bugzilla/show_bug.cgi?id=94523
--- Comment #3 from Martin Liška <marxin at gcc dot gnu.org> --- (In reply to Arnaud Giersch from comment #2) > Hi, > > Faced with the same problem, I noticed that it fails only with -std=c++14 > (not with c++17, nor c++20). Good point! I can only confirm that.