https://gcc.gnu.org/bugzilla/show_bug.cgi?id=109425
--- Comment #3 from Marek Polacek <mpolacek at gcc dot gnu.org> --- (In reply to Hannes Hauswedell from comment #2) > Thanks for the quick reply, and nice that it is already fixed for 13! > > I assume this will not be backported? It wouldn't be a huge problem, because > it is possible to workaround with non-friend operators. I think this is up to Patrick to decide.