Import from sibling folders in Rust.

Considering the app three:

- src
    main.rs
    - models
        models.rs
    - views
        auth.rs


First you need to declare your module inside your main.rs

// main.rs
    
    #[path = "./views/auth.rs"]
    mod auth;
    #[path = "./models/models.rs"]
    mod models;

// Note the compiler will ask about a file called auth.rs or auth/mod.rs
// Since we're using folders we need to create a mod.rs inside it.
// Now our app three should be like bellow

- src
    main.rs
    - models
        mod.rs
        models.rs
    - views
        mod.rs
        auth.rs

// And then inside mod.rs files declare its modules

// models/mod.rs

    pub mod models;

// views/mod.rs

    pub mod auth;

// Now to import something from your models.rs file to auth.rs

// models/models.rs

    pub fn MyModel(){
        println!("{:?}", 'Hello from models.rs function);
    }

// views/auth.rs

    use crate::models::MyModel;

Special thanks to @mozilla_jebrosen:matrix.org