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 BC85B38582A8; Mon,  4 Dec 2023 09:21:27 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org BC85B38582A8
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1701681687;
	bh=HsCXmsQmpf+md3LyOPJlliF5Og7raCh12MCNgBz4UqU=;
	h=From:To:Subject:Date:From;
	b=gg3Hw0iNWrumg2rSIHS9O5tSr/6TDkVvE5G+tSivOprOppSmkS4pjXlbiGQdZsXso
	 BabkNY2Y9CAZwJSHSk0htu28WOpDXshfwpvLuecAELVZSLU0nqojC5GUIfD7qSYHUl
	 7fpFxfvQyRecPZiu+HnfYsSkY7ZtM7LfD1zpddIw=
From: "jehelset at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/112842] New: Constrained parameter pack with trailing param
 gives no matching function.
Date: Mon, 04 Dec 2023 09:21:27 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 13.2.1
X-Bugzilla-Keywords: 
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jehelset at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
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: bug_id short_desc product version bug_status
 bug_severity priority component assigned_to reporter target_milestone
 attachments.created
Message-ID: <bug-112842-4@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=3D112842

            Bug ID: 112842
           Summary: Constrained parameter pack with trailing param gives
                    no matching function.
           Product: gcc
           Version: 13.2.1
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: jehelset at gmail dot com
  Target Milestone: ---

Created attachment 56785
  --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=3D56785&action=3Dedit
Minimal reproducer, compile with --std=3Dc++20

Program below doesn't compile:

template<typename T,typename V>
concept U =3D true;

template<typename... I>
struct V{
  static constexpr void f(U<I> auto ...,int){

  }
};

int main(){
  V<int>::f(0,1); //no matching function for call to =E2=80=98V<int>::f(int=
, int)=E2=80=99
  //template argument deduction/substitution failed:
  //candidate expects 1 argument, 2 provided
}

If there's no trailing parameter it works ok. clang-trunk seemed to handle =
it
fine. gcc-trunk also failed this.=