https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 108736, which changed state.
Bug 108736 Summary: [concepts] multidimensional subscript operator inside requires with variable template arguments is broken https://gcc.gnu.org/bugzilla/show_bug.cgi?id=108736 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |DUPLICATE