trait Material {
    fn bar(&self) {
        println!("mat!");
    }
}
struct Lambertian {}
impl Material for Lambertian{
    fn bar(&self) {
        println!("lambertian!");
    }
}

trait Mesh {
    fn foo(&self) {
        println!("mesh!");
    }
}
struct Sphere<'a> {
    mat: &'a Material,
}
impl<'a> Sphere<'a> {
    fn new<T>(material: &T) -> Sphere
    where
        T: Material + 'a,
    {
        return Sphere {
            mat: material,
        };
    }
}
impl<'a> Mesh for Sphere<'a> {
    fn foo(&self) {
        println!("sphere!");
        self.mat.bar();
    }
}

pub fn main() {
    let l = Lambertian {};

    let meshes: Vec<Box<dyn Mesh>> = vec![Box::new(Sphere::new(&l))];

    meshes[0].foo();
}