Keyword mod

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Organize code into modules.

Use mod to create new modules to encapsulate code, including other modules:

mod foo {
    mod bar {
        type MyType = (u8, u8);
        fn baz() {}

Like structs and enums, a module and its content are private by default, inaccessible to code outside of the module.

To learn more about allowing access, see the documentation for the pub keyword.