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#include <iostream>
#include <typeinfo>
using namespace std;
 
template <typename T0, typename ... Ts>
    class foo {};
 
template <typename ... Ts>
void bar(const foo<Ts...> &v){
	cout << typeid(v).name() << endl;
}
 
int main() {
	// your code goes here
	foo<int,double> f;
	bar<int,double>(f);
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:16:19: error: no matching function for call to ‘bar(foo<int, double>&)’
  bar<int,double>(f);
                   ^
prog.cpp:16:19: note: candidate is:
prog.cpp:9:6: note: template<class ... Ts> void bar(const foo<Ts ...>&)
 void bar(const foo<Ts...> &v){
      ^
prog.cpp:9:6: note:   template argument deduction/substitution failed:
prog.cpp:16:19: note:   mismatched types ‘double’ and ‘double’
  bar<int,double>(f);
                   ^

Standard output is empty