In section [namespace.decl]/7, it is explained that using declarations
can be repeated. Does this mean that the code below is correct?

namespace A{
  void f();
}

using A::f;

namespace A{
  void f(int);
}

using A::f;

If it is correct, would a following call

void g()
{
  f(42);
}

also be correct? If so, where is this specified?

TIA,
Martin
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