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 1A5A63857C7F; Thu, 13 May 2021 02:19:34 +0000 (GMT)
DKIM-Filter: OpenDKIM Filter v2.11.0 sourceware.org 1A5A63857C7F
From: "ppalka at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug libstdc++/100577] [11/12 Regression] Unhelpful diagnostics for
 ill-formed call to partially applied range adaptor object
Date: Thu, 13 May 2021 02:19:34 +0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: changed
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: libstdc++
X-Bugzilla-Version: 11.0
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ppalka 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: 11.2
X-Bugzilla-Flags: 
X-Bugzilla-Changed-Fields: cf_known_to_work keywords target_milestone
 cf_known_to_fail
Message-ID: <bug-100577-4-FL7VZ3eCqQ@http.gcc.gnu.org/bugzilla/>
In-Reply-To: <bug-100577-4@http.gcc.gnu.org/bugzilla/>
References: <bug-100577-4@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: Thu, 13 May 2021 02:19:34 -0000

https://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D100577

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

           What    |Removed                     |Added
----------------------------------------------------------------------------
      Known to work|                            |10.1.0, 10.2.0, 10.3.0
           Keywords|                            |diagnostic
   Target Milestone|---                         |11.2
      Known to fail|                            |11.1.0

--- Comment #1 from Patrick Palka <ppalka at gcc dot gnu.org> ---
Diagnostics for ill-formed calls to adaptor pipelines regress similarly:

#include <ranges>

int main() {
  extern int x[100];
  (std::views::join | std::views::join)(x);
}

<stdin>: In function =E2=80=98int main()=E2=80=99:
<stdin>:5:40: error: use of deleted function =E2=80=98constexpr auto
std::ranges::views::__adaptor::_Pipe<_Lhs, _Rhs>::operator()(_Range&&) cons=
t &&
[with _Range =3D int (&)[100]; _Lhs =3D std::ranges::views::_Join; _Rhs =3D=
=20
std::ranges::views::_Join]=E2=80=99
In file included from <stdin>:1:
/home/patrick/code/gcc-master/libstdc++-v3/include/std/ranges:901:9: note:
declared here
  901 |         operator()(_Range&& __r) const && =3D delete;
      |         ^~~~~~~~=