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+% Drop
+
+<small>There is a new edition of the book and this is an old link.</small>
+
+> `Drop` lets us customize what happens when a value is about to go out of scope.
+
+```rust
+struct CustomSmartPointer {
+    data: String,
+}
+
+impl Drop for CustomSmartPointer {
+    fn drop(&mut self) {
+        println!("Dropping CustomSmartPointer with data `{}`!", self.data);
+    }
+}
+
+fn main() {
+    let c = CustomSmartPointer { data: String::from("my stuff") };
+    let d = CustomSmartPointer { data: String::from("other stuff") };
+    println!("CustomSmartPointers created.");
+}
+```
+
+---
+
+Here are the relevant sections in the new and old books:
+
+* **[in the current edition: Ch 15.03 — The `Drop` Trait Runs Code on Cleanup][2]**
+* <small>[In the first edition: Ch 3.20 — Drop][1]</small>
+
+
+[1]: https://doc.rust-lang.org/1.30.0/book/first-edition/drop.html
+[2]: ch15-03-drop.html