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+% Concurrency
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Historically, programming [concurrency] has been difficult and error prone: Rust hopes to change that.
+> Fearless concurrency allows you to write code that’s free of subtle bugs and is easy to refactor without introducing new bugs.
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 16.00 — Fearless Concurrency][2]**
+* <small>[In the first edition: Ch 4.6 — Concurrency][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/concurrency.html
+[2]: ch16-00-concurrency.html