https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 84140, which changed state.
Bug 84140 Summary: Inline friends are not constrained by concepts https://gcc.gnu.org/bugzilla/show_bug.cgi?id=84140 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED