2 files changed, 3 insertions, 4 deletions
diff --git a/compiler/rustc_data_structures/src/sorted_map/index_map.rs b/compiler/rustc_data_structures/src/sorted_map/index_map.rs
index c2f0ae328..814e7c7fb 100644
--- a/compiler/rustc_data_structures/src/sorted_map/index_map.rs
+++ b/compiler/rustc_data_structures/src/sorted_map/index_map.rs
@@ -1,7 +1,6 @@
 //! A variant of `SortedMap` that preserves insertion order.
 
 use std::hash::{Hash, Hasher};
-use std::iter::FromIterator;
 
 use crate::stable_hasher::{HashStable, StableHasher};
 use rustc_index::vec::{Idx, IndexVec};
@@ -64,13 +63,13 @@ impl<I: Idx, K: Ord, V> SortedIndexMultiMap<I, K, V> {
     /// Returns an iterator over the items in the map in insertion order.
     #[inline]
     pub fn iter(&self) -> impl '_ + DoubleEndedIterator<Item = (&K, &V)> {
-        self.items.iter().map(|(ref k, ref v)| (k, v))
+        self.items.iter().map(|(k, v)| (k, v))
     }
 
     /// Returns an iterator over the items in the map in insertion order along with their indices.
     #[inline]
     pub fn iter_enumerated(&self) -> impl '_ + DoubleEndedIterator<Item = (I, (&K, &V))> {
-        self.items.iter_enumerated().map(|(i, (ref k, ref v))| (i, (k, v)))
+        self.items.iter_enumerated().map(|(i, (k, v))| (i, (k, v)))
     }
 
     /// Returns the item in the map with the given index.
diff --git a/compiler/rustc_data_structures/src/sorted_map/tests.rs b/compiler/rustc_data_structures/src/sorted_map/tests.rs
index 1e977d709..3cc250862 100644
--- a/compiler/rustc_data_structures/src/sorted_map/tests.rs
+++ b/compiler/rustc_data_structures/src/sorted_map/tests.rs
@@ -6,7 +6,7 @@ fn test_sorted_index_multi_map() {
     let set: SortedIndexMultiMap<usize, _, _> = entries.iter().copied().collect();
 
     // Insertion order is preserved.
-    assert!(entries.iter().map(|(ref k, ref v)| (k, v)).eq(set.iter()));
+    assert!(entries.iter().map(|(k, v)| (k, v)).eq(set.iter()));
 
     // Indexing
     for (i, expect) in entries.iter().enumerate() {