Short rust pattern-matching demonstration.

rust_demo.rs

fn main() {
    //let some_value: Result<i32, &'static str> = Ok(12);
    //let some_value: Result<i32, &'static str> = Err("METAL!");
    let some_value: Result<i32, &'static str> = Err("There was an error");
    match some_value {
        Ok(value) => println!("got a value: {}", value),
        Err("METAL!") => println!("a specific metal error occured"),
        Err(x) => println!("an unknown error occurred: {}", x),
    }
    
}