https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 68372, which changed state.
Bug 68372 Summary: [concepts] invalid use of pack expansion expression in member function template declaration https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68372 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED