From 93f198051e5198ccf97b7b98ba76d1ef6ce7e8fc Mon Sep 17 00:00:00 2001
From: LukeMathWalker <20745048+LukeMathWalker@users.noreply.github.com>
Date: Mon, 7 Jul 2025 13:33:25 +0200
Subject: [PATCH] Use a more coincise symbol to signal compilation errors in
 slides

---
 src/idiomatic/leveraging-the-type-system/newtype-pattern.md | 6 ++----
 .../newtype-pattern/semantic-confusion.md                   | 3 +--
 2 files changed, 3 insertions(+), 6 deletions(-)

diff --git a/src/idiomatic/leveraging-the-type-system/newtype-pattern.md b/src/idiomatic/leveraging-the-type-system/newtype-pattern.md
index 17f5f896..18104d73 100644
--- a/src/idiomatic/leveraging-the-type-system/newtype-pattern.md
+++ b/src/idiomatic/leveraging-the-type-system/newtype-pattern.md
@@ -19,8 +19,7 @@ fn double(n: u64) -> u64 {
     n * 2
 }
 
-// This doesn't compile ❌
-double(UserId(1));
+double(UserId(1)); // 🛠️❌
 ```
 
 The Rust compiler won't implicitly convert to (or from) the underlying type.\
@@ -28,8 +27,7 @@ It won't let you use methods or operators defined on the underlying type either:
 
 ```rust,compile_fail
 # pub struct UserId(u64);
-// This doesn't compile ❌
-assert_ne!(UserId(1), UserId(2));
+assert_ne!(UserId(1), UserId(2)); // 🛠️❌
 ```
 
 <details>
diff --git a/src/idiomatic/leveraging-the-type-system/newtype-pattern/semantic-confusion.md b/src/idiomatic/leveraging-the-type-system/newtype-pattern/semantic-confusion.md
index 6cabb87d..f7a9620f 100644
--- a/src/idiomatic/leveraging-the-type-system/newtype-pattern/semantic-confusion.md
+++ b/src/idiomatic/leveraging-the-type-system/newtype-pattern/semantic-confusion.md
@@ -35,8 +35,7 @@ pub fn login(username: &Username, password: &Password) -> Result<(), LoginError>
 
 # let password = Password("password".into());
 # let username = Username("username".into());
-// Compiler error 🎉
-login(password, username);
+login(password, username); // 🛠️❌
 ```
 
 <details>