https://gcc.gnu.org/bugzilla/show_bug.cgi?id=80449
Paolo Carlini <paolo.carlini at oracle dot com> changed: What |Removed |Added ---------------------------------------------------------------------------- Status|NEW |ASSIGNED Assignee|unassigned at gcc dot gnu.org |paolo.carlini at oracle dot com --- Comment #3 from Paolo Carlini <paolo.carlini at oracle dot com> --- This is indeed mostly a duplicate of PR79790 which I already fixed. There is only a minor nit remaining, a meaningless additional diagnostic: 80449.C:3:16: error: cannot deduce template arguments of ‘C<S>’, as it has no viable deduction guides 80449.C:3:16: error: too many initializers for ‘<type error>’ Which seems also easy to avoid.