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diff --git a/rustlings/exercises/16_lifetimes/lifetimes1.rs b/rustlings/exercises/16_lifetimes/lifetimes1.rs
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-// The Rust compiler needs to know how to check whether supplied references are
-// valid, so that it can let the programmer know if a reference is at risk of
-// going out of scope before it is used. Remember, references are borrows and do
-// not own their own data. What if their owner goes out of scope?
-
-// TODO: Fix the compiler error by updating the function signature.
-fn longest<'a>(x: &'a str, y: &'a str) -> &'a str {
- if x.len() > y.len() {
- x
- } else {
- y
- }
-}
-
-fn main() {
- // You can optionally experiment here.
-}
-
-#[cfg(test)]
-mod tests {
- use super::*;
-
- #[test]
- fn test_longest() {
- assert_eq!(longest("abcd", "123"), "abcd");
- assert_eq!(longest("abc", "1234"), "1234");
- }
-}