reverse a linked list

fn reverse_linkedlist(head: Option<~Node>) -> Option<~Node> {		
	let mut result = head;
	loop {
		match result.next {
			Some(~node) => {
				let old_next = node.next;
				node.next = result;
				result = old_next;
			}, 
			None => {
				return result
			}
		}
	}	
	result;
}