Fix new (non-pedantic) clippy warnings

Author: steffahn

src/external_trait_impls/rayon/map.rs

@@ -679,7 +679,7 @@ mod test_par_map {
     fn test_values_mut() {
         let vec = vec![(1, 1), (2, 2), (3, 3)];
         let mut map: HashMap<_, _> = vec.into_par_iter().collect();
-        map.par_values_mut().for_each(|value| *value = (*value) * 2);
+        map.par_values_mut().for_each(|value| *value *= 2);
         let values: Vec<_> = map.par_values().cloned().collect();
         assert_eq!(values.len(), 3);
         assert!(values.contains(&2));

src/external_trait_impls/rayon/raw.rs

@@ -175,7 +175,7 @@ impl<T: Send> UnindexedProducer for ParDrainProducer<T> {
     {
         // Make sure to modify the iterator in-place so that any remaining
         // elements are processed in our Drop impl.
-        while let Some(item) = self.iter.next() {
+        for item in &mut self.iter {
             folder = folder.consume(unsafe { item.read() });
             if folder.full() {
                 return folder;
@@ -193,7 +193,7 @@ impl<T> Drop for ParDrainProducer<T> {
     fn drop(&mut self) {
         // Drop all remaining elements
         if mem::needs_drop::<T>() {
-            while let Some(item) = self.iter.next() {
+            for item in &mut self.iter {
                 unsafe {
                     item.drop();
                 }