use std::env;

fn main() {
    match env::var("APP_ENV") {
        Ok(value) => println!("APP_ENV={value}"),
        Err(env::VarError::NotPresent) => {
            println!("APP_ENV is not set; using development")
        }
        Err(env::VarError::NotUnicode(_)) => {
            eprintln!("APP_ENV is not valid Unicode");
            std::process::exit(1);
        }
    }
}