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Date: Mon, 19 May 2003 07:46:00 -0000
From: derrick@cco.caltech.edu
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Subject: c++/10852: Old for-scoping rules improperly used?
X-SW-Source: 2003-05/txt/msg02055.txt.bz2
List-Id: <gcc-prs.sourceware.org>


>Number:         10852
>Category:       c++
>Synopsis:       Old for-scoping rules improperly used?
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    unassigned
>State:          open
>Class:          rejects-legal
>Submitter-Id:   net
>Arrival-Date:   Mon May 19 07:46:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Derrick Bass
>Release:        gcc-3.3
>Organization:
>Environment:

>Description:
I think this is a bug in g++; but there is always the possibility that it is a bug in my understanding of C++. In the following code gcc assumes that the variable i at the end of function is the same as in the for loop and produces the following error:
nstest.cc: In function `void f()':
nstest.cc:9: error: name lookup of `i' changed for new ISO `for' scoping
nstest.cc:6: error:   using obsolete binding at `i'

I think it should use the variable i from inside the namespace and quit complaining, but as I said, I may just be misunderstanding C++ arcana.

Here's the sample code...
namespace X {
  int i;
}

void f() {
  for (int i=0; i<10; ++i)
    ;
  using namespace X;
  i;
}
>How-To-Repeat:

>Fix:
Workaround is to replace "using namespace X" with "using X::i"
>Release-Note:
>Audit-Trail:
>Unformatted: