//example for Ok and Err

use std::fs::File;

fn main() {
    let f = File::open("hello.txt");

    let f = match f {
        Ok(file) => file,
        Err(error) => {
            panic!("There was a problem opening the file: {:?}", error)  // as there’s no file named hello.txt and if we run this code, we’ll see the following error thread 'main' panicked at 'There was a problem opening the file
        },
    };
}