ICE on 3d vector

3d_map_test.rs

enum TileSet {
  Empty,
  Dirt 
}

type XYZ   = (uint, uint, uint);

static MAXX: uint = 10;
static MAXY: uint = 10;
static MAXZ: uint = 1;

struct Map {
  tiles: [[[TileSet, ..MAXX], ..MAXY], ..MAXZ]
}

impl Map {
  fn new() -> Map {
    Map { tiles: [[[Empty, ..MAXX], ..MAXY], ..MAXZ] }
  }

  fn set(&mut self, index: &XYZ, tile: TileSet) -> Result<TileSet, ~str> {
    let (x, y, z) = *index;
    self.tiles[z][y][x] = tile;
    Ok(tile)
  }
}

impl Index<(uint, uint, uint), Option<TileSet>> for Map {
  fn index(&self, index: &XYZ) -> Option<TileSet> {
    let (x, y, z) = *index;
    println!("{}", self.tiles.len());
    Some(self.tiles[z][y][x])
  }
}

#[test]
fn test_3d_array(){
  let mut map = Map::new();
  map[(0, 0, 0)] = Some(Dirt);
  let tile = map[(0, 0, 0)];
  println!("{:?}", map);
}