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#include <iostream>
using namespace std;
template <typename T>
void Foo(T&& a) {  }
int main() {
	int w=1;
	Foo<int*>(&w);//why no gg?
	int *w2;
	Foo<int*>(w2);//why gg?
	// your code goes here
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:9:14: error: no matching function for call to 'Foo(int*&)'
  Foo<int*>(w2);//why gg?
              ^
prog.cpp:9:14: note: candidate is:
prog.cpp:4:6: note: template<class T> void Foo(T&&)
 void Foo(T&& a) {  }
      ^
prog.cpp:4:6: note:   template argument deduction/substitution failed:
prog.cpp:9:14: note:   cannot convert 'w2' (type 'int*') to type 'int*&&'
  Foo<int*>(w2);//why gg?
              ^

Standard output is empty