Module in other file

• mod
• pub

fn main() {
    println!("in main");

    // crate::tools::private_helper(); // private function

    tools::public_helper();
    crate::tools::public_helper();
}

mod tools;

#![allow(unused)]
fn main() {
fn private_helper() {
    println!("in tools::private_helper");
}

pub fn public_helper() {
    println!("in tools::public_helper");

    private_helper();
}
}

in main
in tools::public_helper
in tools::private_helper
in tools::public_helper
in tools::private_helper