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From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/113529] Incorrect result of requires-expression in case of
 function call ambiguity and `operator<=>`
Date: Fri, 26 Jan 2024 14:42:23 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D113529

--- Comment #3 from GCC Commits <cvs-commit at gcc dot gnu.org> ---
The releases/gcc-13 branch has been updated by Patrick Palka
<ppalka@gcc.gnu.org>:

https://gcc.gnu.org/g:663d9e168bc1f2649721436f5188563eda9d04f0

commit r13-8255-g663d9e168bc1f2649721436f5188563eda9d04f0
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Jan 24 17:11:09 2024 -0500

    c++: ambiguous member lookup for rewritten cands [PR113529]

    Here we handle the operator expression u < v inconsistently: in a SFINAE
    context we accept it, and in a non-SFINAE context we reject it with

      error: request for member 'operator<=3D>' is ambiguous

    as per [class.member.lookup]/6.  This inconsistency is ultimately
    because we neglect to propagate error_mark_node after recursing in
    add_operator_candidates, fixed like so.

            PR c++/113529

    gcc/cp/ChangeLog:

            * call.cc (add_operator_candidates): Propagate error_mark_node
            result after recursing to find rewritten candidates.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp2a/spaceship-sfinae3.C: New test.

    Reviewed-by: Jason Merrill <jason@redhat.com>
    (cherry picked from commit fecb45a936d62ca24dd8b4985ea0555c28edefa8)=