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 D52783857B98; Tue, 11 Jul 2023 14:06:24 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org D52783857B98
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1689084384;
	bh=i6Kn2RTQmTyOIDeFvOTjXarEMxjrRb0+m197Ha7A7Zs=;
	h=From:To:Subject:Date:In-Reply-To:References:From;
	b=gFg/EfmOmdZSsUCsaf1Y09sMhG75Gd1JIx7VOooaQtPI8Ye49KkTpj2TELon35hpo
	 7WZDBa8SH8WoY2veF+cRP5PQQv2m81op47aamY7y+RbRdlHsj9NtqD6EnsoAGw/Q7m
	 TWKXfZzMMv+Sob5ZxJAmTFGR6nROghB8hhF/adFk=
From: "cvs-commit at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/110580] [14 Regression] gcc fails to typecheck nix-2.16.1
 source: error: invalid initialization of reference of type
Date: Tue, 11 Jul 2023 14:06:24 +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: 14.0
X-Bugzilla-Keywords: accepts-invalid, rejects-valid, wrong-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: 14.0
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: 
Message-ID: <bug-110580-4-vVl3ZFi3Jg@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-110580-4@http.gcc.gnu.org/bugzilla/>
References: <bug-110580-4@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
List-Id: <gcc-bugs.sourceware.org>

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D110580

--- Comment #8 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:b76d71564925abcabe6f5ad61d904b23c682cdfb

commit r14-2433-gb76d71564925abcabe6f5ad61d904b23c682cdfb
Author: Patrick Palka <ppalka@redhat.com>
Date:   Tue Jul 11 10:05:19 2023 -0400

    c++: coercing variable template from current inst [PR110580]

    Here during ahead of time coercion of the variable template-id v1<int>,
    since we pass only the innermost arguments to coerce_template_parms (and
    outer arguments are still dependent at this point), substitution of the
    default template argument V=3DU just lowers U from level 2 to level 1 r=
ather
    than replacing it with int as expected.  Thus after coercion we incorre=
ctly
    end up with (effectively) v1<int, T> instead of v1<int, int>.

    Coercion of a class/alias template-id on the other hand always passes
    all levels arguments, which avoids this issue.  So this patch makes us
    do the same for variable template-ids.

            PR c++/110580

    gcc/cp/ChangeLog:

            * pt.cc (lookup_template_variable): Pass all levels of arguments
            to coerce_template_parms, and use the parameters from the most
            general template.

    gcc/testsuite/ChangeLog:

            * g++.dg/cpp1y/var-templ83.C: New test.=