fn validate_data_simple(data: &Data) -> Result<(), ()> {

    if !data.magic.eq(&[0x13, 0x37]) { return Err(()) }

}

fn validate_data_match(data: &Data) -> i32 {

    let x: u32 = match data.content.parse::<u32>() {

        Ok(_x) => {

            let y = 2 * _x;

            if y < 6 {

                y * 2

        Err(_) => 0

    if x == 0 {

        -1

        (x as i32) + 1

}

fn largest<T: PartialOrd>(list: &[T]) -> &T {

    let mut largest = &list[0];

    for item in list {

        if item > largest {

            largest = item;

        }

    largest

}

fn validate_data_generics(data: &Data) {

    let number_list = vec![34, 50, 25, 100, 65];

    let result = largest(&number_list);

    println!("The largest number is {}", result);

    let char_list = vec!['y', 'm', 'a', 'q'];

    let result = largest(&char_list);

    println!("The largest char is {}", result);

    let result = largest(data.content.as_bytes());

    println!("The largest content char is {}", result);

}

    fn parser_detects_errors() {

        let mut blob = Data{ magic: [0x73, 0x31], len: 2, content: "AB".parse().unwrap() };

        blob.content = blob.content + "Y";

        let result = validate_data_simple(&blob);

        assert!(result.is_err());

    }

    fn check_match() {

        let blob = Data{ magic: [0x73, 0x31], len: 2, content: "XX".parse().unwrap() };

        let x = validate_data_match(&blob);

        assert_eq!(x, -1);

    }

    fn check_match2() {

        let blob = Data{ magic: [0x73, 0x31], len: 2, content: "40".parse().unwrap() };

        let x = validate_data_match(&blob);

        assert_eq!(x, 161);

    }

    fn check_generic() {

        let blob = Data{ magic: [0x73, 0x31], len: 2, content: "QWE".parse().unwrap() };

        validate_data_generics(&blob);

    }

    fn check_panic() {

        let blob = Data{ magic: [0x73, 0x31], len: 0, content: "4".parse().unwrap() };

        validate_data_panic(&blob);

    }

    fn check_not_panic() {

        let blob = Data{ magic: [0x73, 0x31], len: 2, content: "4".parse().unwrap() };

        validate_data_panic(&blob);

    }