}
    }
}
impl<H> Position<Option<H>> {
    pub fn unwrap(self) -> Position<H> {
        Position {
            change: self.change.unwrap(),
            pos: self.pos,

impl<H> Vertex<Option<H>> {
    pub fn unwrap(self) -> Vertex<H> {
        Vertex {
            change: self.change.unwrap(),
            start: self.start,
            end: self.end,
        }
    }
}