Modules in Rust 2018

.
├── lib.rs
└── foo/
├── mod.rs
└── bar.rs

.
├── lib.rs
├── foo.rs
└── foo/
└── bar.rs

In top level, the same level of the main.rs

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// module.rs

pub fn some_module_fn() {}

Then if you want to add more stuff in the module, helper functions, sub-modules, add them in the folder named the same name as your module.

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// In ./module/shared.rs

pub fn shared_fn() {}

To make sure the sub module can be accessed by others, you need to add the module in the top level file as well:

1 2	// module.rs mod shared; // This imports the sub module