Dereferencing seems to be used in the book before it's explained

[DanielSank]

The Rust book (2018 edition) uses the following example in chapter 10 (comments added by me)

fn largest(list: &[i32]) -> i32 {
    let mut largest = list[0];  // i32

    for &item in list.iter() {  // item is &i32
        if item > largest {
            largest = item;
        }
    }

    largest
}

This was and still is puzzling to me for several reasons:

1. list is &[i32], so I'd expect list[0] to be &i32. Instead, list[0] is i32...
2. which is extra weird because list.iter() seems to yield &i32's.
3. Finally, what the heck is &item? I thought & made references, but here it seems to do the opposite.

I gather that there's some kind of implicit dereferencing going on when we do list[0], and I guess &item is also a dereference. It would be nice if this were explained in the book before it shows up in the example.

[estebank]

Moved to the appropriate repo.