From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-374365-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 21768 invoked by alias); 18 Nov 2011 07:02:54 -0000
Received: (qmail 21751 invoked by uid 22791); 18 Nov 2011 07:02:51 -0000
X-SWARE-Spam-Status: No, hits=-2.9 required=5.0	tests=ALL_TRUSTED,AWL,BAYES_00
X-Spam-Check-By: sourceware.org
Received: from localhost (HELO gcc.gnu.org) (127.0.0.1)    by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 18 Nov 2011 07:02:38 +0000
From: "pubby.8 at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/51203] New: Recursive alias templates not working
Date: Fri, 18 Nov 2011 07:49:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: pubby.8 at gmail dot com
X-Bugzilla-Status: UNCONFIRMED
X-Bugzilla-Priority: P3
X-Bugzilla-Assigned-To: unassigned at gcc dot gnu.org
X-Bugzilla-Target-Milestone: ---
X-Bugzilla-Changed-Fields:
Message-ID: <bug-51203-4@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: quoted-printable
MIME-Version: 1.0
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <gcc-bugs.gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/gcc-bugs/>
List-Post: <mailto:gcc-bugs@gcc.gnu.org>
List-Help: <mailto:gcc-bugs-help@gcc.gnu.org>
Sender: gcc-bugs-owner@gcc.gnu.org
X-SW-Source: 2011-11/txt/msg01861.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=3D51203

             Bug #: 51203
           Summary: Recursive alias templates not working
    Classification: Unclassified
           Product: gcc
           Version: 4.7.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: pubby.8@gmail.com


-std=3Dc++11
gcc version 4.7.0 20111112 (experimental) (GCC)

I presume this is correctly formed code:

template <typename t>
struct foo {
  template <int n>
  using next =3D typename foo<t>::next<n + 1>;
};

main.cpp:4:37: error: expected =E2=80=98;=E2=80=99 before =E2=80=98<=E2=80=
=99 token
main.cpp:4:37: error: expected unqualified-id before =E2=80=98<=E2=80=99 to=
ken

Interestingly, changing the line to this compiles so long as next isn't use=
d:

  using next =3D typename foo<t>::next;

The error is very similar to this ill-formed code:

  using next<n> =3D int;

main.cpp:4:13: error: expected =E2=80=98=3D=E2=80=99 before =E2=80=98<=E2=
=80=99 token
main.cpp:4:13: error: expected type-specifier before =E2=80=98<=E2=80=99 to=
ken
main.cpp:4:13: error: expected =E2=80=98;=E2=80=99 before =E2=80=98<=E2=80=
=99 token
main.cpp:4:13: error: expected unqualified-id before =E2=80=98<=E2=80=99 to=
ken