https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 67384, which changed state.
Bug 67384 Summary: [concepts] More fun with deduction constraints https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67384 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED