Namespace lookup: g++ 4.0.0 -> g++ 4.0.1 regression?

[Jhair Tocancipa Triana]

Consider the following snippet:

--8<---------------cut here---------------start------------->8---
namespace foo
{
  class A
  {
    friend class B;

    void bar (B);
  };

  class B {};
}
--8<---------------cut here---------------end--------------->8---

This compiles fine with:

g++ (GCC) 3.3.3
g++ (GCC) 4.0.0

But fails with g++ (GCC) 4.0.1:

$ g++ -c namespace.cc 
namespace.cc:7: error: 'B' has not been declared

Why? If this a bug, I am not sure it is the same bug as:

http://gcc.gnu.org/bugzilla/show_bug.cgi?id=19403

-- 
--Jhair

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