CH 10: 01-syntax: Missing example.

[ch9xy]

URL to the section(s) of the book with this problem:

https://github.com/rust-lang/book/blob/main/src/ch10-01-syntax.md

Description of the problem:

at the last example in section: In Function Definitions,

last example only suggests the reader to implement PartialOrd to compile the code but didn't show how.
this is the code from book:

fn largest<T>(list: &[T]) -> &T {
    let mut largest = &list[0];

    for item in list {
        if item > largest {
            largest = item;
        }
    }

    largest
}

fn main() {
    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);
}

Suggested fix:

PartialOrd implemented version of the code above should be added to the book where it says implement partialord to make the prior code work.

[chriskrycho]

Thanks for the report! The text says this:

By following the help text's suggestion, we restrict the types valid for T to only those that implement PartialOrd and this example will compile, because the standard library implements PartialOrd on both i32 and char.

The idea is that all you need to do is follow the compiler’s advice. That is an important point to internalize. There is no need for an extra code example here, because the compiler itself gives the code example! 🎉