How to infer the type of std::tuple argument in function return?

I want to get the type of std::tuple argument, that is passed to function like variadic argument. This type I need to put into std::pair. So I don't have any information about types that user will put in std::tuple and what types will have std::pair after function return.

For example, call may be like this:

std::tuple t = std::make_tuple(18, "Test", 17.2);
std::pair<const char*, double> p = foo<1,2>(t);  

Expected, that p will contain "Test" and 17.2.

I've tryed this code:

template<int N, int M, typename ... Args>
auto foo(std::tuple<Args...> t) -> std::pair<   std::tuple_element<N, std::tuple<Args...>>::type,
                                                std::tuple_element<M, std::tuple<Args...>>::type>
{
     return std::tie(std::get<N>(t), std::get<M>(t));
}

But all that I get is compiler error:

Error   C2923   'std::pair': 'std::tuple_element<M,std::tuple<_Rest...>>::type' is not a valid template type argument for parameter '_Ty2'  

Error   C2923   'std::pair': 'std::tuple_element<N,std::tuple<_Rest...>>::type' is not a valid template type argument for parameter '_Ty1'

What should I change to force this code to work?