dependency injection with lifetimes

sprite.rs

pub struct Sprite <'a> {
    x: i32,
    y: i32,
    velocity: i32,
    pub object: Object <'a>,
}

impl <'a> Sprite <'a> {
    pub fn new(x: i32, y: i32, velocity: i32, object: Object<'a>) -> Sprite<'a>{
        Self {
            x: x,
            y: y,
            velocity: velocity,
            object: object,
        }
    }
}