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+% Lifetimes
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> Every reference in Rust has a lifetime, which is the scope for which that reference is valid.
+> Most of the time lifetimes are implicit and inferred.
+
+```rust
+{
+ let x = 5; // -----+-- 'b
+ // |
+ let r = &x; // --+--+-- 'a
+ // | |
+ println!("r: {}", r); // | |
+ // --+ |
+} // -----+
+```
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 10.03 — Lifetimes][2]**
+* <small>[In the first edition: Ch 3.10 — Lifetimes][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/lifetimes.html
+[2]: ch10-03-lifetime-syntax.html