[Bug c++/110065] [12/13 Regression] [C++20/2b] auto return type in template argument causes ICE, also accepts-invalid

[mpolacek at gcc dot gnu.org via Gcc-bugs]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=110065

Marek Polacek <mpolacek at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
         Resolution|---                         |FIXED
             Status|ASSIGNED                    |RESOLVED

--- Comment #7 from Marek Polacek <mpolacek at gcc dot gnu.org> ---
No need to fix this in 13 because that still has the

+  if (cxx_dialect >= cxx1y && type_uses_auto (r))
+    {
+      error ("invalid use of %<auto%> in template argument");
+      r = error_mark_node;
+    }

check in cp_parser_template_type_arg.  Fixed thus.