https://gcc.gnu.org/bugzilla/show_bug.cgi?id=67491 Bug 67491 depends on bug 68093, which changed state.
Bug 68093 Summary: [concepts] friend function declarations that differ only by constraints are rejected as redefinitions https://gcc.gnu.org/bugzilla/show_bug.cgi?id=68093 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED