May a name of an enumerator coincide with a name of a namespace in a using declaration.

That is whether this using declaration

using N::N;
 
is valid or not and why. 

#include <iostream>
namespace N
{
enum { N = 10 };

void f()
{
std::cout << "N = " << N << '\n';
}
}
using N::N;
void f()
{
std::cout << "N = " << N << '\n';
}
int main()
{
N::f();
f();

return 0;
}


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