From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugzilla@gcc.gnu.org>
Received: by sourceware.org (Postfix, from userid 48)
 id 1B0FF3855011; Mon, 19 Jul 2021 10:37:00 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1B0FF3855011
From: "redi at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/101500] [9/10/11/12 Regression] gcc accepts the code with
 extra curly braces
Date: Mon, 19 Jul 2021 10:36:59 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 11.1.0
X-Bugzilla-Keywords: accepts-invalid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: redi at gcc dot gnu.org
X-Bugzilla-Status: NEW
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cf_known_to_fail cc cf_known_to_work
 cf_reconfirmed_on everconfirmed short_desc bug_status
Message-ID: <bug-101500-4-BG4ZHhZCyO@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-101500-4@http.gcc.gnu.org/bugzilla/>
References: <bug-101500-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-BeenThere: gcc-bugs@gcc.gnu.org
X-Mailman-Version: 2.1.29
Precedence: list
List-Id: Gcc-bugs mailing list <gcc-bugs.gcc.gnu.org>
List-Unsubscribe: <https://gcc.gnu.org/mailman/options/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=unsubscribe>
List-Archive: <https://gcc.gnu.org/pipermail/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-request@gcc.gnu.org?subject=help>
List-Subscribe: <https://gcc.gnu.org/mailman/listinfo/gcc-bugs>,
 <mailto:gcc-bugs-request@gcc.gnu.org?subject=subscribe>
X-List-Received-Date: Mon, 19 Jul 2021 10:37:00 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D101500

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to fail|                            |10.3.0, 11.1.0, 12.0,
                   |                            |8.1.0, 9.4.0
                 CC|                            |jason at gcc dot gnu.org
      Known to work|                            |7.5.0
   Last reconfirmed|                            |2021-07-19
     Ever confirmed|0                           |1
            Summary|gcc accepts the code with   |[9/10/11/12 Regression] gcc
                   |extra curly braces          |accepts the code with extra
                   |                            |curly braces
             Status|UNCONFIRMED                 |NEW

--- Comment #1 from Jonathan Wakely <redi at gcc dot gnu.org> ---
EDG v6.2 also accepts this, but Clang and MSVC don't.

GCC started to accept it at:

    PR c++/85092 - C++17 ICE with unused list constructor.

            * call.c (conv_binds_ref_to_prvalue): Also count ck_identity
            from a TARGET_EXPR.

    From-SVN: r259052


I'll confirm it as a regression, since it doesn't look like that intended to
change this case.=