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#include <iterator>
#include <vector>
 
using namespace std;
namespace n { template <typename T> void iterator(std::vector<T>) {} }
std::vector<int> v;
 
int main() {
    using n::iterator;
    iterator(v);
}
 
 

/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_iterator_base_types.h: In function ‘int main()’:
/usr/lib/gcc/i686-pc-linux-gnu/4.3.4/include/g++-v4/bits/stl_iterator_base_types.h:110: error: ‘template<class _Category, class _Tp, class _Distance, class _Pointer, class _Reference> struct std::iterator’ is not a function,
prog.cpp:5: error:   conflict with ‘template<class T> void n::iterator(std::vector<T, std::allocator<_CharT> >)’
prog.cpp:10: error:   in call to ‘iterator’

Standard output is empty