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 791EA385800D; Wed, 20 Jan 2021 14:55:29 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 791EA385800D
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/95434] ICE for CTAD in generic lambda within variadic lambda
Date: Wed, 20 Jan 2021 14:55:29 +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: 10.1.0
X-Bugzilla-Keywords: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: cvs-commit at gcc dot gnu.org
X-Bugzilla-Status: ASSIGNED
X-Bugzilla-Resolution: 
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: ppalka at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-95434-4-dhEezvI70m@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-95434-4@http.gcc.gnu.org/bugzilla/>
References: <bug-95434-4@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: Wed, 20 Jan 2021 14:55:29 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D95434

--- Comment #5 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:cafcfcb5840b62d9fc80c12192189351e995a4f2

commit r11-6816-gcafcfcb5840b62d9fc80c12192189351e995a4f2
Author: Patrick Palka <ppalka@redhat.com>
Date:   Wed Jan 20 09:44:33 2021 -0500

    c++: Fix tsubsting CLASS_PLACEHOLDER_TEMPLATE [PR95434]

    Here, during partial instantiation of the generic lambda, we do
    tsubst_copy on the CLASS_PLACEHOLDER_TEMPLATE for U{0} which yields a
    (level-lowered) TEMPLATE_TEMPLATE_PARM rather than the corresponding
    TEMPLATE_DECL.  This later confuses do_class_deduction which expects
    that a CLASS_PLACEHOLDER_TEMPLATE is always a TEMPLATE_DECL.

    gcc/cp/ChangeLog:

            PR c++/95434
            * pt.c (tsubst) <case TEMPLATE_TYPE_PARM>: If tsubsting
            CLASS_PLACEHOLDER_TEMPLATE yields a TEMPLATE_TEMPLATE_PARM,
            adjust to its TEMPLATE_TEMPLATE_PARM_TEMPLATE_DECL.

    gcc/testsuite/ChangeLog:

            PR c++/95434
            * g++.dg/cpp2a/lambda-generic9.C: New test.=