Example in "Separating Modules into Different Files" doesn't look to need main function

[lucascr91]

In the section "Separating Modules into Different Files", authors show how to separate modules in many files. At the end of the example, the user folder structure looks like this:

├── Cargo.lock
├── Cargo.toml
├── src
│   ├── front_of_house
│   │   └── hosting.rs
│   ├── front_of_house.rs
│   └── lib.rs

Copying the code snippets for each file using the copy icon gives:

lib.rs

mod front_of_house;

pub use crate::front_of_house::hosting;

pub fn eat_at_restaurant() {
    hosting::add_to_waitlist();
    hosting::add_to_waitlist();
    hosting::add_to_waitlist();
}

front_of_house.rs

pub mod hosting;

front_of_house/hosting.rs

#![allow(unused)]
fn main() {
pub fn add_to_waitlist() {}
}

Using this snippets, cargo check fails:

error[E0425]: cannot find function `add_to_waitlist` in module `hosting`
 --> src/lib.rs:6:14
  |
6 |     hosting::add_to_waitlist();
  |              ^^^^^^^^^^^^^^^ not found in `hosting`

error: aborting due to previous error

For more information about this error, try `rustc --explain E0425`.
error: could not compile `restaurant`

To learn more, run the command again with --verbose.

It works using:

front_of_house/hosting.rs

pub fn add_to_waitlist() {}