[Rust] Basketball class, implementing both Color and Shape

pub struct Basketball {
     color: Box<Color>,
     shape: Box<Shape>,
}

impl Basketball {
    pub fn new() -> Basketball {
        let orange = Box::new(Orange{});
        let ball = Box::new(Ball{});
        Basketball{ color: orange, shape: ball }
    }
}

impl Color for Basketball {
    fn color<'a>(&self) -> &'a str {
        self.color.color()
    }
}

impl Shape for Basketball {
    fn shape<'a>(&self) -> &'a str {
        self.shape.shape()
    }
}

impl Item for Basketball {
    fn name<'a>(&self) -> &'a str {
        "basketball"
    }
}