Simplified example with lifetimes specified

src/main.rs

@@ -6,11 +6,7 @@ fn main() {
     println!("The longest string is {result}");
 }
 
-fn longest<'a, 'b, 'out>(a: &'a str, b: &'b str) -> &'out str
+fn longest<'a>(a: &'a str, b: &'a str) -> &'a str {
-where
-    'a: 'out,
-    'b: 'out,
-{
     if a.len() > b.len() {
         a
     } else {