diff --git a/crates/loro-internal/examples/encoding_refactored.rs b/crates/loro-internal/examples/encoding_refactored.rs
index 1d4dbc9a..c58490c4 100644
--- a/crates/loro-internal/examples/encoding_refactored.rs
+++ b/crates/loro-internal/examples/encoding_refactored.rs
@@ -56,6 +56,7 @@ fn bench_decode() {
 
         let mut txn = loro.txn().unwrap();
         let mut n = 0;
+        #[allow(warnings)]
         for TextAction { pos, ins, del } in actions.iter() {
             if n % 10 == 0 {
                 drop(txn);
diff --git a/crates/loro-internal/src/refactor/oplog.rs b/crates/loro-internal/src/refactor/oplog.rs
index ad12bd26..919e967d 100644
--- a/crates/loro-internal/src/refactor/oplog.rs
+++ b/crates/loro-internal/src/refactor/oplog.rs
@@ -501,8 +501,8 @@ impl OpLog {
         let mut total_changes = 0;
         let mut total_ops = 0;
         let mut total_atom_ops = 0;
-        let mut total_dag_node = self.dag.map.len();
-        for (_, changes) in &self.changes {
+        let total_dag_node = self.dag.map.len();
+        for changes in self.changes.values() {
             total_changes += changes.len();
             for change in changes.iter() {
                 total_ops += change.ops.len();
diff --git a/crates/loro-internal/src/refactor/oplog/dag.rs b/crates/loro-internal/src/refactor/oplog/dag.rs
index 85f43479..20048092 100644
--- a/crates/loro-internal/src/refactor/oplog/dag.rs
+++ b/crates/loro-internal/src/refactor/oplog/dag.rs
@@ -3,7 +3,7 @@ use std::cmp::Ordering;
 use crate::change::Lamport;
 use crate::dag::{Dag, DagNode};
 use crate::id::{Counter, ID};
-use crate::span::{HasId, HasLamport, HasLamportSpan};
+use crate::span::{HasId, HasLamport};
 use crate::version::{Frontiers, ImVersionVector, VersionVector};
 use rle::{HasIndex, HasLength, Mergable, Sliceable};