Annoying g++ improvement of the day

I know there's bound to be a good reason for the C++ spec to say we can't do this, and I can guess at it, but this gcc 3.4 C++-conformance improvement, pointed out to me by Bryan Forbes, is an irritation. Of course, I don't know the reason exactly because there is still no freely-available copy of the C++ spec online. No, I don't want the C# one instead