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#include <iostream>
 
using namespace std;
 
template <typename T> auto f(T x) -> decltype(x*x)
{
  return x * x;
}
 
template <typename T> T g(T x)
{
  return x * x;
}
 
template <template <class> class F> void test(F f)
{
	auto a = f(32);
	auto b = f(' ');
	auto c = f(2000000000L);
 
	cout << a << ' ' << b << ' ' << c << endl;
}
 
int main()
{
	test(f);
	test(g);
 
	return 0;
}

prog.cpp:15:47: error: variable or field 'test' declared void
 template <template <class> class F> void test(F f)
                                               ^
prog.cpp:15:49: error: missing template arguments before 'f'
 template <template <class> class F> void test(F f)
                                                 ^
prog.cpp: In function 'int main()':
prog.cpp:26:8: error: 'test' was not declared in this scope
  test(f);
        ^

Standard output is empty