diff --git a/src/main.rs b/src/main.rs
index 37f87d3..9019423 100644
--- a/src/main.rs
+++ b/src/main.rs
@@ -8,5 +8,7 @@ fn add_10(value: Option<u32>) -> Result<u32, String> {
 fn main() {
     let value = add_10(None);
 
-    println!("Result is: {}", value.unwrap());
+    println!("Result is: {}", value.unwrap_or(42));
+
+    panic!("Non recoverable error.");
 }