use self::Direction::*;
use std::slice::Iter;

#[derive(Debug)]
pub enum Direction { North, South, East, West }

impl Direction {
    pub fn iterator() -> Iter<'static, Direction> {
        static DIRECTIONS: [Direction;  4] = [North, South, East, West];
        DIRECTIONS.into_iter()
    }
}


fn main() {
    for dir in Direction::iterator() {
        println!("{:?}", dir);
    }
}