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Wow, that in there are not only `pub` and `pub(crate)` for specifying visibility of items, but there is also:
- `pub(super)`: item will only be visible to the parent module
- pub(in crate::foo): item will only be visible in module `foo`

🤯 :rust:

See this excellent blog post by Aloso, when you want to understand Rust's module system:
aloso.github.io/2021/03/28/mod

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