Fix linter warnings

src/destructured.rs

@@ -67,7 +67,7 @@ where
     /// If the key is not found, return the index where it should be
     /// inserted.
     fn index(&self, key: &K) -> usize {
-        match self.keys.binary_search(&key) {
+        match self.keys.binary_search(key) {
             Ok(i) => i,
             Err(i) => {
                 if i >= self.keys.len() {
@@ -100,11 +100,7 @@ where
 
         Box::new((start..=end).filter_map(move |i| {
             let key = &self.keys[i];
-            if let Some(fields) = self.hashmap.get(key) {
+            self.hashmap.get(key).map(|fields| (key.clone(), fields))
-                Some((key.clone(), fields))
-            } else {
-                None
-            }
         }))
     }
 }