From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-423426-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 28116 invoked by alias); 30 May 2013 12:34:36 -0000
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
Received: (qmail 28055 invoked by uid 48); 30 May 2013 12:34:22 -0000
From: "ai.azuma at gmail dot com" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Subject: [Bug c++/57471] New: [C++11] Bizarre error for template parameter pack
Date: Thu, 30 May 2013 12:34:00 -0000
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: c++
X-Bugzilla-Version: 4.9.0
X-Bugzilla-Keywords:
X-Bugzilla-Severity: normal
X-Bugzilla-Who: ai.azuma 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-Flags:
X-Bugzilla-Changed-Fields: bug_id short_desc product version bug_status bug_severity priority component assigned_to reporter attachments.created
Message-ID: <bug-57471-4@http.gcc.gnu.org/bugzilla/>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
MIME-Version: 1.0
X-SW-Source: 2013-05/txt/msg02099.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=57471

            Bug ID: 57471
           Summary: [C++11] Bizarre error for template parameter pack
           Product: gcc
           Version: 4.9.0
            Status: UNCONFIRMED
          Severity: normal
          Priority: P3
         Component: c++
          Assignee: unassigned at gcc dot gnu.org
          Reporter: ai.azuma at gmail dot com

Created attachment 30226
  --> http://gcc.gnu.org/bugzilla/attachment.cgi?id=30226&action=edit
Output of -v option and preprocessed source

GCC 4.9.0 20130526 rejects the following valid code.

//-----------------------------------------
struct A
{
  static constexpr bool value = true;
};

template<typename... Types>
struct B
{
  static_assert(A::value, "");
  static_assert(sizeof...(Types) == 0, "");
};
//-----------------------------------------

The error message is;

main.cpp:10:27: error: 'A::Types' has not been declared
   static_assert(sizeof...(Types) == 0, "");
                           ^

The above code successfully compiles with 4.7.4 20130525 and 4.8.1 20130523.