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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