From mboxrd@z Thu Jan  1 00:00:00 1970
Return-Path: <java-prs-return-11050-listarch-java-prs=gcc.gnu.org@gcc.gnu.org>
Received: (qmail 15102 invoked by alias); 16 Dec 2010 20:58:48 -0000
Received: (qmail 15077 invoked by uid 22791); 16 Dec 2010 20:58:47 -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; Thu, 16 Dec 2010 20:58:45 +0000
From: "jason at gcc dot gnu.org" <gcc-bugzilla@gcc.gnu.org>
To: java-prs@gcc.gnu.org
Subject: [Bug java/46983] New: Diagnostic about change in meaning of name in
 class misses some cases
X-Bugzilla-Reason: CC
X-Bugzilla-Type: new
X-Bugzilla-Watch-Reason: None
X-Bugzilla-Product: gcc
X-Bugzilla-Component: java
X-Bugzilla-Keywords: diagnostic
X-Bugzilla-Severity: normal
X-Bugzilla-Who: jason at gcc dot gnu.org
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-46983-8172@http.gcc.gnu.org/bugzilla/>
X-Bugzilla-URL: http://gcc.gnu.org/bugzilla/
Auto-Submitted: auto-generated
Content-Type: text/plain; charset="UTF-8"
MIME-Version: 1.0
Date: Thu, 16 Dec 2010 20:58:00 -0000
Mailing-List: contact java-prs-help@gcc.gnu.org; run by ezmlm
Precedence: bulk
List-Id: <java-prs.gcc.gnu.org>
List-Subscribe: <mailto:java-prs-subscribe@gcc.gnu.org>
List-Archive: <http://gcc.gnu.org/ml/java-prs/>
List-Post: <mailto:java-prs@gcc.gnu.org>
List-Help: <mailto:java-prs-help@gcc.gnu.org>, <http://gcc.gnu.org/ml/#faqs>
Sender: java-prs-owner@gcc.gnu.org
X-SW-Source: 2010-q4/txt/msg00037.txt.bz2

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=46983

           Summary: Diagnostic about change in meaning of name in class
                    misses some cases
           Product: gcc
           Version: 4.6.0
            Status: UNCONFIRMED
          Keywords: diagnostic
          Severity: normal
          Priority: P3
         Component: java
        AssignedTo: unassigned@gcc.gnu.org
        ReportedBy: jason@gcc.gnu.org
                CC: jason@gcc.gnu.org, rth@gcc.gnu.org


In C++, it is ill-formed, no diagnostic required, for a lookup to have
different meanings at the point of lookup and in the context of the complete
class.  G++ gives diagnostics about some instances of this, but misses this
one:

template <class T>
struct A
{
  typedef typename T::Y Z;
};

struct B
{
  typedef int Y;
};

struct C: B
{
  struct N: A<C> { };
  typedef char Y;
};

int ar[sizeof(C::N::Z) == sizeof(int) ? 1 : -1];

Here when we instantiate A<C>, C is not yet complete, so when we lookup C::Y we
find B::Y.  If we were to do the lookup in the full class, it would find C::Y
instead.