https://gcc.gnu.org/bugzilla/show_bug.cgi?id=105375
--- Comment #6 from Jonathan Wakely <redi at gcc dot gnu.org> --- (In reply to raldone01 from comment #5) > Thank you for your reply. > What does that mean? As it says at the link in comment 4, "The following behavior-changing defect reports were applied retroactively to previously published C++ standards." > Are defect reports updates for older standards? Yes. > Is it meant to be available at some point in c++17? Yes.