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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D99664

--- Comment #4 from CVS Commits <cvs-commit at gcc dot gnu.org> ---
The master branch has been updated by Patrick Palka <ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:d04b0c75794545f1f7a942764285e21eaf2915a1

commit r12-2377-gd04b0c75794545f1f7a942764285e21eaf2915a1
Author: Patrick Palka <ppalka@redhat.com>
Date:   Fri Jul 16 16:21:10 2021 -0400

    c++: covariant reference return types [PR99664]

    This implements the wording changes of CWG 960 which clarifies that two
    reference types are covariant only if they're both lvalue references
    or both rvalue references.

            DR 960
            PR c++/99664

    gcc/cp/ChangeLog:

            * search.c (check_final_overrider): Compare TYPE_REF_IS_RVALUE
            when the return types are references.

    gcc/testsuite/ChangeLog:

            * g++.dg/inherit/covariant23.C: New test.=