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#include <iostream>
 
namespace ns //::ns
{
    void f() //::ns::f
    {
        std::cout << "::ns::f"<< std::endl;
    }
    namespace ns //::ns::ns
    {
        void f() //::ns::ns::f
        {
            std::cout << "::ns::ns::f"<< std::endl;
        }
    }
}
 
using namespace ns; //::ns
 
int main() //::main
{
    ::ns::f(); //::ns::f
    ::ns::ns::f(); //::ns::ns::f
    f(); //::ns::f
    ns::f(); //error, ambiguous
}

prog.cpp: In function ‘int main()’:
prog.cpp:25: error: reference to ‘ns’ is ambiguous
prog.cpp:4: error: candidates are: namespace ns { }
prog.cpp:10: error:                 namespace ns::ns { }

Standard output is empty