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#include <iostream>
using namespace std;
template<class T>
class Test;
class Foo
{
public:
	Foo(){cout<<"Foo"<<endl;}
	~Foo(){cout<<"~Foo"<<endl;}
};
int main() {
 
	auto&& z = {1, 2, 3};
	z = {1, 2, 3};
	Test<decltype(z)> t;
	auto&& f = Foo();
	Test<decltype(f)> t2;
 
	return 0;
}

prog.cpp: In function ‘int main()’:
prog.cpp:15:20: error: aggregate ‘Test<std::initializer_list<int>&&> t’ has incomplete type and cannot be defined
  Test<decltype(z)> t;
                    ^
prog.cpp:17:20: error: aggregate ‘Test<Foo&&> t2’ has incomplete type and cannot be defined
  Test<decltype(f)> t2;
                    ^~

Standard output is empty