exit-code.rs

#[derive(Debug)]
struct Resource(i32);

impl Drop for Resource {
    fn drop(&mut self) {
        println!("goodbye from {}", self.0);
    }
}

enum Error {
    Foo
}

impl Error {
    pub fn exit_code(self) -> i32 {
        match self {
            Error::Foo => 114,
        }
    }
}


fn go() -> Result<(), Error> {
    let _x = Resource(0);
    return Err(Error::Foo);
}

fn main() {
    go().unwrap_or_else(|e| {
        println!("about to terminate the process");
        std::process::exit(e.exit_code());
    });
}