From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <gcc-bugs-return-126890-listarch-gcc-bugs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 21279 invoked by alias); 18 Jan 2005 09:15:34 -0000
Mailing-List: contact gcc-bugs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
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 21256 invoked by uid 48); 18 Jan 2005 09:15:28 -0000
Date: Tue, 18 Jan 2005 09:15:00 -0000
From: "reichelt at gcc dot gnu dot org" <gcc-bugzilla@gcc.gnu.org>
To: gcc-bugs@gcc.gnu.org
Message-ID: <20050118091525.19499.reichelt@gcc.gnu.org>
Reply-To: gcc-bugzilla@gcc.gnu.org
Subject: [Bug c++/19499] New: [3.4/4.0 regression] Bad diagnostic for namespace as template parameter
X-Bugzilla-Reason: CC
X-SW-Source: 2005-01/txt/msg02371.txt.bz2
List-Id: <gcc-bugs.sourceware.org>

The diagnostic for the following invalid code snippet could be improved:

=================================
template<typename> struct A {};

namespace N {}

A<N> a;
=================================

On mainline we now get:

bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: expected constructor, destructor, or type conversion before
'<' token

With 3.3.5 we get:

bug5.cc:5: error: use of namespace `N' as expression
bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: ISO C++ forbids declaration of `a' with no type

which is okay IMHO. With 3.4.3 we get

bug5.cc:5: error: template argument 1 is invalid
bug5.cc:5: error: invalid type in declaration before ';' token

which is less informative, but still okay.
With the current 3.4 branch we almost get the same mess as with mainline.

-- 
           Summary: [3.4/4.0 regression] Bad diagnostic for namespace as
                    template parameter
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Keywords: diagnostic, monitored
          Severity: normal
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: reichelt at gcc dot gnu dot org
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19499