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% Enums
<small>There is a new edition of the book and this is an old link.</small>
> Enums allow you to define a type by enumerating its possible values.
```rust
enum IpAddrKind {
V4,
V6,
}
```
---
Here are the relevant sections in the new and old books:
* **[in the current edition: Ch 6.01 — Defining an Enum][2]**
* <small>[In the first edition: Ch 3.13 — Enums][1]</small>
[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/enums.html
[2]: ch06-01-defining-an-enum.html
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