fix: confine the user further in variable exercises

We want to teach a specific lesson. To ensure that we do, let's try to
provide more clarity on what the user should not do.

1 files changed, 1 insertions, 1 deletions

diff --git a/exercises/variables/variables5.rs b/exercises/variables/variables5.rs
index 47a68a5..5b2c2fa 100644
--- a/exercises/variables/variables5.rs
+++ b/exercises/variables/variables5.rs
@@ -4,7 +4,7 @@
 // I AM NOT DONE
 
 fn main() {
-    let number = "3";
+    let number = "3"; // don't change this line
     println!("Number {}", number);
     number = 3;
     println!("Number {}", number);