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 4F3203882ACC; Thu,  5 Oct 2023 14:27:07 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 4F3203882ACC
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gcc.gnu.org;
	s=default; t=1696516027;
	bh=FI54yRIaUsxeSWoJbZMjN3jHS5lXeSHtLDiopfI0ENY=;
	h=From:To:Subject:Date:From;
	b=yAbMPZKdUSAwNaCkaj6C56TeAgaa68p6hc/eyPCR/UQxKmWiP3pwIvhoZnPoWcbgO
	 lpZ9+G+Gwe06ng9t0rfHvBDbOrMLTfrhjMHlYwePeHvupQzyS+3fQKy2N8wThinbM7
	 w1TFvh6eVLJDm4UXhYk8kS/xTqP47NEQ3MvxeMd0=
From: "pinskia at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/111705] New: [14 Regression] use of concepted copy
 constructored struct inside a template function messes up
Date: Thu, 05 Oct 2023 14:27:06 +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: 14.0
X-Bugzilla-Keywords: rejects-valid
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pinskia at gcc dot gnu.org
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
 keywords bug_severity priority component assigned_to reporter
 target_milestone
Message-ID: <bug-111705-4@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=3D111705

            Bug ID: 111705
           Summary: [14 Regression] use of concepted copy constructored
                    struct inside a template function messes up
           Product: gcc
           Version: 14.0
            Status: UNCONFIRMED
          Keywords: rejects-valid
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: pinskia at gcc dot gnu.org
  Target Milestone: ---

Take:
```
template<class> concept c =3D true;
template<class T>
struct ts
{
  template<class T1>
   requires(c<T1>)
    ts(const ts<T1>&);
  template<class T1>
   requires(!c<T1>)
    ts(const ts<T1>&) =3D delete;
  ts() =3D default;
};


using P =3D ts<int>;
void (*f)(P);
template<class>
void f1()
{=20=20
  P x;
  f(x);
}
```
This gets rejected with the following (bogus) error message:
```
<source>: In substitution of 'template<class T1>  requires !(c<T1>)
ts<int>::ts(const ts<T1>&) [with T1 =3D int]':
<source>:21:5:   required from here
   21 |   f(x);
      |     ^
<source>:10:3:   required by the constraints of 'template<class T>
template<class T1>  requires !(c<T1>) ts<T>::ts(const ts<T1>&)'
<source>:9:12: error: satisfaction value of atomic constraint '!(c<T1>) [wi=
th
T1 =3D int]' changed from '<expression error>' to 'false'
    9 |   requires(!c<T1>)
      |           ~^~~~~~~
<source>:21:5: note: satisfaction value first evaluated to '<expression err=
or>'
from here
   21 |   f(x);
      |     ^
```

This was reduced from PR 111703 (but is different since this was accepted
before  in GCC 13)=