Passing Tuple Arguments to Tuple

[Xinok]

I was experimenting with recursive templates. I successfully created a
template which could test if a value is prime or not. What I tried to do next
is create another template which would use a tuple to build a list of primes.

template IsPrime(uint V, uint M = 2){
	static if(V == 0 || V == 1) const bool IsPrime = false;
	else static if(M*M <= V){
		static if(V%M == 0) const bool IsPrime = false;
		else const bool IsPrime = IsPrime!(V, M+1);
	}
	else const bool IsPrime = true;
}

template FindPrime(V...){
	static if(V[0] < 2){
		alias V[1..length] FindPrime;
	}
	static if(IsPrime!(V[0])){
		alias FindPrime!(V[0]-1, V[0..length]) FindPrime; // Error: 'tuple V is used
as a type'
	}
	else{
		alias FindPrime!(V[0]-1, V[1..length]) FindPrime;
	}
}


This error makes no sense to me. What's the problem? Why can't you pass tuples
to tuples?