Wat.

kek.cpp

#include <utility>

template<typename... Args>
struct whatever { 
	// uncomment to break stdlib
	//typedef std::index_sequence_for<Args...> name_doesnt_matter; 
};

#include <tuple>


int main(){

	// No effect: compiler bug?
	typedef std::index_sequence_for<int, int> x;
	
	std::tuple<const char*> r = std::tuple_cat(std::make_tuple("b"));

	return 0;
}