Using declarations

[Martin von Loewis <martin@mira.isdn.cs.tu-berlin.de>]

I'm still not certain about the exact semantics of using declarations.
It seems to me that

namespace A{
  void f();
}

using A::f;

namespace A{
  void f(int);
}

using A::f;

void g(){
  f(4);
}

should be illegal. The redeclaration of 'using A::f;' is certainly
correct, however, the selected set of declarations should be the one
found at the first declaration.

If A::f(int) is visible inside ::g, please let me know why.

TIA,
Martin