Explain pub use in Chapter 7 with a more robust example

[Defman21]

In the version 1.0.0 of the book, the example for the pub use keyword is more self-explanatory than in the current one because it demonstrates how exactly pub use works (instead of calling languages::japanese::greetings::hello we can simply do languages::japanese::hello if we include pub use self::greetings in the languages::japanese module). The current version only slightly mentions its behavior:

By using pub use, external code can now call the add_to_waitlist function using hosting::add_to_waitlist. If we hadn’t specified pub use, the eat_at_restaurant function could call hosting::add_to_waitlist in its scope, but external code couldn’t take advantage of this new path.

An example showing how it would be called in an external module similar to the version 1.0.0 would be much helpful to understand the concept of re-export.

[limuyuan]

Strongly agree. I also find myself unable to understand what would happen if pub use is not used.

[Anutrix]

As someone who just started learning Rust, Section 7.2 example fails to show why pub use might be needed there. Understood after reading https://stackoverflow.com/a/69277671/5195033. Upvotes on that question and answer suggest there are more folks facing similar issue.
0d2ea76 doesn't add sample code snippet but just gives better explanation.

Adding something like following main.rs in 7.2 along with it seems more helpful:

use restaurant::eat_at_restaurant;
use restaurant::hosting; // Possible due to `pub use` in lib.rs

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