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#include <iostream>
using namespace std;
 
template <typename T>
void Foo(T&& t) {}
 
template <template <typename, typename...> typename C, typename T, typename... Rest>
void Bar(C<T, Rest...>&& c) { }
 
int main() {
	int i = 0;
	Foo(i);
 
	string str;
	Bar(str);
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:15:6: error: cannot bind rvalue reference of type ‘std::__cxx11::basic_string<char>&&’ to lvalue of type ‘std::__cxx11::string’ {aka ‘std::__cxx11::basic_string<char>’}
  Bar(str);
      ^~~
prog.cpp:8:6: note:   initializing argument 1 of ‘void Bar(C<T, Rest ...>&&) [with C = std::__cxx11::basic_string; T = char; Rest = {std::char_traits<char>, std::allocator<char>}]’
 void Bar(C<T, Rest...>&& c) { }
      ^~~

Standard output is empty