Clippy

src/lib.rs

@@ -2028,7 +2028,7 @@ mod tests {
         // The result of the merge should be the same list of artists, but with the last artist now
         // in first place.
         let mut expected = left.to_owned();
-        expected.last_mut().map(|a| a.sort = artist_sort.clone());
+        expected.last_mut().as_mut().unwrap().sort = artist_sort.clone();
         expected.rotate_right(1);
 
         let mut merged = left.clone();