https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65608 Bug 65608 depends on bug 65619, which changed state.
Bug 65619 Summary: friend declaration with template template parameter not recognized https://gcc.gnu.org/bugzilla/show_bug.cgi?id=65619 What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |RESOLVED Resolution|--- |FIXED
