https://gcc.gnu.org/bugzilla/show_bug.cgi?id=91260
Jonathan Wakely <redi at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|UNCONFIRMED |RESOLVED Resolution|--- |INVALID --- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> --- This is not a bug. The names are still reserved for use by the implementation, so we can do whatever we want with them. Libstdc++ chooses to use those names to define classes identical to the ones of the same name defined by previous standards. Removing those classes would have ABI impact, and so I am opposed to removing them.