https://gcc.gnu.org/bugzilla/show_bug.cgi?id=61732
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> --- The program is only ill-formed if you instantiate derived<X>, and you don't do that.