From 77d3ac01e76e51f69ce05d0ee2ca3721b93d063b Mon Sep 17 00:00:00 2001
From: Fabian Bornhofen <fbornhofen@google.com>
Date: Mon, 9 Jan 2023 17:21:54 +0100
Subject: [PATCH] Add speaker notes for scopes-shadowing.md

---
 src/basic-syntax/scopes-shadowing.md | 16 ++++++++++++++++
 1 file changed, 16 insertions(+)

diff --git a/src/basic-syntax/scopes-shadowing.md b/src/basic-syntax/scopes-shadowing.md
index c585a969..4bf76e5a 100644
--- a/src/basic-syntax/scopes-shadowing.md
+++ b/src/basic-syntax/scopes-shadowing.md
@@ -19,3 +19,19 @@ fn main() {
     println!("after: {a}");
 }
 ```
+
+<details>
+
+* Shadowing looks obscure at first, but is convenient for holding on to values after `.unwrap()`.
+* The following code demonstrates why the compiler can't simply reuse memory locations when shadowing an immutable variable in a scope, even if the type does not change.
+
+```rust,editable
+fn main() {
+    let a = 1;
+    let b = &a;
+    let a = a + 1;
+    println!("{a} {b}");
+}
+```
+
+</details>