func (t *Tile) NextPos() (int, int) {
	return t.next.x, t.next.y
}
func (t *Tile) NextPos() (int, int) {
	return t.next.x, t.next.y
}
func ( t * Tile ) NextPos ( ) ( int , int ) { return t . next . x , t . next . y }
// NextPos returns the tile's next position.
// NextPos is used only at testing so far.
NextPos returns the tile s next position . NextPos is used only at testing so far .