Comment by fasquoika

>A safe alternative is to use indexes instead of references.

    struct ParsedFile {
        contents: Vec<u8>,
        words: Vec<(usize, usize)>
    }

>This works well, and you can make it ergonomic by wrapping the index pair in a new type

You should probably just use the std::ops::Range type for this. It's what's created by the `..` syntax