Vec<char> or an array for instance - [char; 20] can (automatically) create a "slice" of type &[char]. This is true for all types (not just char). The operator

Vec<char> or an array for instance - [char; 20] can (automatically) create a "slice" of type &[char]. This is true for all types (not just char). The operator for this is for eg l[1..10]. It can also happen automatically. &str is the same type as &[char] - just a renaming. Still learning Rust myself, apologies if this leads you astray. Just do some reading on slices. https://doc.rust-lang.org/book/ch04-03-slices.html#string-slices https://doc.rust-lang.org/book/ch04-03-slices.html#string-sl... https://doc.rust-lang.org/std/slice/ https://doc.rust-lang.org/std/slice/