[Bug c++/86191] [6/7/8/9 Regression] A missing error message?

[redi at gcc dot gnu.org]

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86191

Jonathan Wakely <redi at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |jason at gcc dot gnu.org
      Known to work|                            |4.4.7
            Summary|A missing error message?    |[6/7/8/9 Regression] A
                   |                            |missing error message?
      Known to fail|                            |4.5.0, 6.4.0, 7.3.0, 8.1.0,
                   |                            |9.0

--- Comment #3 from Jonathan Wakely <redi at gcc dot gnu.org> ---
It stopped being ambiguous with r153957

            PR c++/41703
            * pt.c (check_undeduced_parms): New subroutine of...
            (more_specialized_fn): ...here.  Undeduced template parms can make
            a template less specialized than another.