Type dependent template name

#include <iostream>

template<typename T>
void f(T x)
{
   g(x); // g is a dependent name
};

void g(int a)
{
   std::cout << a;
}

int main()
{
   int a = 12;
   f(a);
}

//this should be point of declaration for f<int>    

Above code gives compilation error "‘g’ was not declared in this scope, and no declarations were found by argument-dependent lookup at the point of instantiation".

Since g is a dependent name, its name should be visible at the time of instantiation. Please tell what am I missing?