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fn result_test(i: i32) -> Result<&'static str, &'static str> {

    if i > 0 {
        Err("Error")
    } else {
        Ok("ok")
    }
}

fn main() {
    println!("Hello, world!");

    let a = result_test(-1);

    assert_eq!(a.is_ok(), true);

    match a {
        Ok(v) => {println!("v: {v}")},
        Err(e) => {println!("e: {e}")}
    }
}

https://doc.rust-lang.org/std/result/enum.Result.html