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Add a note for overlap module tree #4808

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3 changes: 3 additions & 0 deletions src/ch07-03-paths-for-referring-to-an-item-in-the-module-tree.md
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Expand Up @@ -193,6 +193,9 @@ interested in this topic, see [the Rust API Guidelines][api-guidelines].
> This helps you design a good API; not only are you the author, but you’re
> also a client!
>
> **Do not** let multiple module trees overlap (like `mod foo;` in both
> _src/lib.rs_ and _src/main.rs_), as this can cause serious inconsistencies
>
> In [Chapter 12][ch12]<!-- ignore -->, we’ll demonstrate this organizational
> practice with a command line program that will contain both a binary crate
> and a library crate.
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