https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91383
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |DUPLICATE --- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> --- See Bug 91260 comment 1. This is not a bug. Continuing to provide those features is conforming. If you don't want to use them in C++17, don't use them. If you want your code to fail to compile, there are other ways to make your code ill-formed. *** This bug has been marked as a duplicate of bug 91260 ***