I did not mean "any rvalue-reference" and bind to "any l- or rvalue", but that you can have an "int &&", "int& &&", "const int& &&", and even "int&& &&". I updated my comment to say "can be made from" instead "can bind to".

Your code example does not work because you call "foo" instead of "bar". But consider this one:

#include <iostream>

using namespace std;

template<class T> T bar(T&& i){ return std::forward<T>(i); }

int main() {

  int i=0;

  cout << bar<int&&>(6) << endl;

  return 0;

}