Trying to deserialize and borrow

gistfile1.txt

#[derive(Debug, Serialize, Deserialize)]
pub struct EnvVar<'a> {
    name: &'a str,
    default: &'a str,
    optional: bool,
}:

#[derive(Debug, Serialize, Deserialize)]
pub struct Config<'a> {
    #[serde(borrow)]
    env_vars: Vec<env::EnvVar<'a>>,
}

pub fn load_config<'a>() -> Result<Config<'a>> {
    let file = File::open("ctr.json")?;
    let config: Config = serde_json::from_reader(file)?;
    Ok(config)
}