Comeau and G++ disagree. Compiler bug?

From:

Alan Woodland <ajw05@aber.ac.uk>

Newsgroups:

comp.lang.c++

Date:

Sun, 12 Aug 2007 21:45:36 +0100

Message-ID:

<1186951538.593422@leri.aber.ac.uk>

Hi,

I was trying to come up with obscure C++ questions in the style of GoTW
and ran across this unexpected difference between G++ and comeau. Can
anyone point me in the direction of the correct result for this program?

#include <iostream>

namespace A {
   class Foo { };
   struct f {
   public:
      f(const Foo& f) { std::cout << "ctor" << std::endl; }
   };
}

template <typename T>
void f(const T& t) { std::cout << "Template ref" << std::endl; }

void f(A::Foo& f) { std::cout << "Plain ref" << std::endl; }

int main() {
   f(A::Foo());
   return 0;
}

G++ doesn't accept it and says:
test.cc: In function 'int main()':
test.cc:5: error: 'struct A::f' is not a function,
test.cc:14: error: conflict with 'void f(A::Foo&)'
test.cc:17: error: in call to 'f'
G++ version was:
g++ (GCC) 4.1.3 20070718 (prerelease) (Debian 4.1.2-14)
Copyright (C) 2006 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.

Whereas Comeau allows it (I only tried it online, so I don't for certain
know what f(A::Foo()); actually resolved to. Comeau version was:
Comeau C/C++ 4.3.9 (Mar 27 2007 17:24:47) for ONLINE_EVALUATION_BETA1
Copyright 1988-2007 Comeau Computing. All rights reserved.
MODE:strict errors C++ noC++0x_extensions

Thanks,
Alan