[Bug c++/21181] New: namespace lookup error message misleading

[tneumann at pi3 dot informatik dot uni-mannheim dot de]

Consider the following C++ code:

class A;
namespace X {
class B { friend class A; };
}
using namespace X;
class A {};
A a;

In the last line the compiler complains that A is undefined. After reading the 
release notes I understamd what happens (although I'm surprised. E.g. Comeau 
accepts the code). 
However the error message is very misleading: The problem is not that A is 
undefined but that X::A is undefined! This is very confusing for users.

-- 
           Summary: namespace lookup error message misleading
           Product: gcc
           Version: 4.0.0
            Status: UNCONFIRMED
          Severity: enhancement
          Priority: P2
         Component: c++
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: tneumann at pi3 dot informatik dot uni-mannheim dot de
                CC: gcc-bugs at gcc dot gnu dot org


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=21181