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From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/109621] [10/11/12/13/14 Regression] GCC accepts invalid
 program with multiple using declarations
Date: Tue, 25 Apr 2023 17:24:37 +0000
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https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D109621

--- Comment #2 from Jonathan Wakely <redi at gcc dot gnu.org> ---
Possibly started with=20

    re PR c++/31749 (ICE with invalid redeclaration of builtin)

            PR c++/31749

            gcc/cp/
            * name-lookup.c (do_nonmember_using_decl): Shift implicit type
            declarations into appropriate slots for comparison.  Fix type
            comparison.

            gcc/testsuite/
            * g++.dg/lookup/builtin3.C: New test.
            * g++.dg/lookup/builtin4.C: New test.
            * g++.dg/lookup/using19.C: New test.

    From-SVN: r127600

Or something before that and after r127526.=