Prior to 3.4, a private copy constructor works just fine.  In 3.4.1, it seems
that a simple example as below will fail with a message:

gccbug.cxx: In function `int main()':
gccbug.cxx:17: error: `Simple::Simple(const Simple&)' is private
gccbug.cxx:32: error: within this context

 
class Simple {
public:
  Simple (int i) : m_i (i) {} 
  int m_i;
private:
  Simple (const Simple&);       // hide this
};

std::ostream & operator<< (std::ostream & f, const Simple & s)
{
  f << s.m_i;

  return f;
}


I have a variation on this test that has a public copy constructor that asserts
if it's called.  The test program never calls the copy constructor.

Is this a change in the language or a bug?