impl Debug for ParValuesMut

Author: cuviper

src/map.rs

@@ -948,6 +948,8 @@ impl<K, V> ExactSizeIterator for ValuesMut<'_, K, V> {
 
 impl<K, V> FusedIterator for ValuesMut<'_, K, V> {}
 
+// TODO: `impl Debug for ValuesMut` once we have MSRV 1.53 for `slice::IterMut::as_slice`
+
 /// An owning iterator over the values of a `IndexMap`.
 ///
 /// This `struct` is created by the [`into_values`] method on [`IndexMap`].

src/rayon/map.rs

@@ -346,6 +346,13 @@ pub struct ParValuesMut<'a, K, V> {
     entries: &'a mut [Bucket<K, V>],
 }
 
+impl<K, V: fmt::Debug> fmt::Debug for ParValuesMut<'_, K, V> {
+    fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+        let iter = self.entries.iter().map(Bucket::value_ref);
+        f.debug_list().entries(iter).finish()
+    }
+}
+
 impl<'a, K: Send, V: Send> ParallelIterator for ParValuesMut<'a, K, V> {
     type Item = &'a mut V;