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+% Closures
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Anonymous functions you can save in a variable or pass as arguments to other functions.
+
+```rust
+# use std::thread;
+# use std::time::Duration;
+
+let expensive_closure = |num| {
+    println!("calculating slowly...");
+    thread::sleep(Duration::from_secs(2));
+    num
+};
+# expensive_closure(5);
+```
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 13.01 — Closures][2]**
+* <small>[In the first edition: Ch 3.23 — Closures][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/closures.html
+[2]: ch13-01-closures.html