Rust Linked List (with owned pointers)

owned_ll.rs

enum LinkedList
{
	Node(int, ~LinkedList),
	Nil
}

impl LinkedList
{
	fn push_front(&mut self, x: int)
	{
		*self = self.push_front_r(x);
	}

	fn push_front_r(&mut self, x: int) -> LinkedList
	{
		match *self
		{
			Node(v, ref mut next) => Node(x, ~next.push_front_r(v)),
			Nil => Node(x, ~Nil)
		}
	}

	fn push_back(&mut self, x: int)
	{
		match *self
		{
			Node(_, ref mut next) => next.push_back(x),
			Nil => *self = Node(x, ~Nil)
		}
	}
}

fn pop_front(list: ~LinkedList) -> (int, ~LinkedList)
{
	let mut value: int = -1;
	let new_list: ~LinkedList = match *list
	{
		Node(v, next) => {value = v; next},
		Nil => ~Nil
	};
	return (value, new_list);
}

fn main()
{
	let mut list: ~LinkedList = ~Nil;
	list.push_back(7);
	list.push_front(2);
	list.push_front(100);
	list.push_front(10);
	list.push_back(67);

	let mut value: int;
	for _ in range(0, 5)
	{
		match pop_front(list)
		{
			(v, new_list) => {value = v; list = new_list}
		}
		println!("{:d}", value);
	}
}