add debugging to test (#19563)

* add debugging to test

* update cargo

runtime/src/accounts_db.rs

@@ -12181,10 +12181,8 @@ pub mod tests {
                 assert!(db.storage.get_slot_storage_entries(*slot).is_none());
                 assert!(db.accounts_cache.slot_cache(*slot).is_none());
                 let account_in_slot = slot_to_pubkey_map[slot];
-                assert!(db
-                    .accounts_index
-                    .get_account_read_entry(&account_in_slot)
-                    .is_none());
+                let item = db.accounts_index.get_account_read_entry(&account_in_slot);
+                assert!(item.is_none(), "item: {:?}", item);
             }
 
             // Wait for flush to finish before starting next trial

runtime/src/accounts_index.rs

@@ -133,6 +133,12 @@ pub struct ReadAccountMapEntry<T: IsCached> {
     slot_list_guard: RwLockReadGuard<'this, SlotList<T>>,
 }
 
+impl<T: IsCached> Debug for ReadAccountMapEntry<T> {
+    fn fmt(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "{:?}", self.borrow_owned_entry())
+    }
+}
+
 impl<T: IsCached> ReadAccountMapEntry<T> {
     pub fn from_account_map_entry(account_map_entry: AccountMapEntry<T>) -> Self {
         ReadAccountMapEntryBuilder {