src/main.rs

@@ -1,14 +1,5 @@
-fn add_10(value: Option<u32>) -> Result<u32, String> {
-    match value {
-        Some(v) => Ok(v + 10),
-        None => Err(String::from("value was empty")),
+fn main() {
+    for value in (-10..10).rev() {
+        println!("Value: {}", value);
     }
 }
-
-fn main() {
-    let value = add_10(None);
-
-    println!("Result is: {}", value.unwrap_or(42));
-
-    panic!("Non recoverable error.");
-}