use serde::{Deserialize, Serialize};
use std::io::Write;

#[derive(Debug, Deserialize, Serialize)]
enum Thing {
    Thing1(String),
    Thing2(u64),
    Thing3(Box<[Thing]>),
    Thing4,
}

fn main() -> anyhow::Result<()> {
    let thing = Thing::Thing3(vec![Thing::Thing2(42), Thing::Thing4].into_boxed_slice());
    let v = serde_cbor::ser::to_vec_packed(&thing)?;
    std::fs::File::create("cbor")?.write_all(&v)?;
    Ok(())
}