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 252223858408; Mon, 27 Sep 2021 13:59:22 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 252223858408
From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/102479] segfault when deducing class template arguments for
 tuple with libc++-14
Date: Mon, 27 Sep 2021 13:59:21 +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: ice-on-valid-code
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppalka 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: assigned_to bug_status everconfirmed cc
 cf_reconfirmed_on
Message-ID: <bug-102479-4-oSQ88Hucfe@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-102479-4@http.gcc.gnu.org/bugzilla/>
References: <bug-102479-4@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, 27 Sep 2021 13:59:22 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D102479

Patrick Palka <ppalka at gcc dot gnu.org> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
           Assignee|unassigned at gcc dot gnu.org      |ppalka at gcc dot g=
nu.org
             Status|UNCONFIRMED                 |ASSIGNED
     Ever confirmed|0                           |1
                 CC|                            |ppalka at gcc dot gnu.org
   Last reconfirmed|                            |2021-09-27

--- Comment #2 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Confirmed, not a regression AFAICT.  Reduced rejects-valid testcase:

template<class T> struct A;

template<class T>
struct tuple {
  tuple(T);

  template<template<class> class Tmpl, typename A<Tmpl<char>>::type =3D 0>
  tuple(Tmpl<T>);

  template<template<class> class Tmpl, typename A<Tmpl<long>>::type =3D 0>
  tuple(Tmpl<T>);
};

auto r =3D tuple(0);

We should also make sure the alias CTAD case works too:

template<class T> using const_tuple =3D tuple<const T>;
auto s =3D const_tuple(0);=