1 files changed, 8 insertions, 1 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 0ec32dc43..c2f0ae328 100644
--- a/compiler/rustc_data_structures/src/sorted_map/index_map.rs
+++ b/compiler/rustc_data_structures/src/sorted_map/index_map.rs
@@ -120,13 +120,20 @@ where
         self.items.hash(hasher)
     }
 }
+
 impl<I: Idx, K, V, C> HashStable<C> for SortedIndexMultiMap<I, K, V>
 where
     K: HashStable<C>,
     V: HashStable<C>,
 {
     fn hash_stable(&self, ctx: &mut C, hasher: &mut StableHasher) {
-        self.items.hash_stable(ctx, hasher)
+        let SortedIndexMultiMap {
+            items,
+            // We can ignore this field because it is not observable from the outside.
+            idx_sorted_by_item_key: _,
+        } = self;
+
+        items.hash_stable(ctx, hasher)
     }
 }