How can I include a module from another file from the same project?

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You don’t need the mod hello in your hello.rs file. Code in any file but the crate root (main.rs for executables, lib.rs for libraries) is automatically namespaced in a module.

To include the code from hello.rs in your main.rs, use mod hello;. It gets expanded to the code that is in hello.rs (exactly as you had before). Your file structure continues the same, and your code needs to be slightly changed:

main.rs:

mod hello;

fn main() {
    hello::print_hello();
}

hello.rs:

pub fn print_hello() {
    println!("Hello, world!");
}

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