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#include <iostream>
using namespace std;
 
template <class T>
struct SingleFunc
{
	T t;
	void run() { t(); }
};
 
template <class... CompositeTypes>
struct CompositeFunc
{
 
};
 
struct Foo
{
	void operator()()
	{
		cout << "!\n";
	}
};
 
int main() {
 
	SingleFunc<[](){std::cout<<"!\n"}> s;
 
	s.run();
 
	return 0;
}

prog.cpp: In function 'int main()':
prog.cpp:27:13: error: lambda-expression in template-argument
  SingleFunc<[](){std::cout<<"!\n"}> s;
             ^
prog.cpp:27:35: error: template argument 1 is invalid
  SingleFunc<[](){std::cout<<"!\n"}> s;
                                   ^
prog.cpp:29:4: error: request for member 'run' in 's', which is of non-class type 'int'
  s.run();
    ^

Standard output is empty