diff --git a/crates/loro-core/src/container/text/text_container.rs b/crates/loro-core/src/container/text/text_container.rs
index b2b34c5e..5b24079c 100644
--- a/crates/loro-core/src/container/text/text_container.rs
+++ b/crates/loro-core/src/container/text/text_container.rs
@@ -336,7 +336,7 @@ impl Container for TextContainer {
         &mut self,
         _: &mut Hierarchy,
         rich_op: &RichOp,
-        import_context: &mut ImportContext,
+        _import_context: &mut ImportContext,
     ) {
         self.tracker.track_apply(rich_op);
     }
diff --git a/crates/loro-core/src/lib.rs b/crates/loro-core/src/lib.rs
index 22e5c03c..bddd5bea 100644
--- a/crates/loro-core/src/lib.rs
+++ b/crates/loro-core/src/lib.rs
@@ -40,7 +40,6 @@ pub(crate) use op::{ContentType, InsertContentTrait, Op};
 // TODO: rename as Key?
 pub(crate) type InternalString = DefaultAtom;
 pub(crate) use container::Container;
-pub(crate) use log_store::ImportContext;
 
 pub use container::{list::List, map::Map, text::Text, ContainerType};
 pub use log_store::LogStore;
diff --git a/crates/loro-core/src/log_store.rs b/crates/loro-core/src/log_store.rs
index 8d1b7442..1ab88fab 100644
--- a/crates/loro-core/src/log_store.rs
+++ b/crates/loro-core/src/log_store.rs
@@ -109,7 +109,7 @@ impl LogStore {
         for span in diff.left.iter() {
             let changes = self.get_changes_slice(span.id_span());
             for change in changes.iter() {
-                let vec = ans.entry(change.id.client_id).or_insert_with(|| Vec::new());
+                let vec = ans.entry(change.id.client_id).or_insert_with(Vec::new);
                 vec.push(self.change_to_export_format(change));
             }
         }
diff --git a/crates/loro-core/src/loro.rs b/crates/loro-core/src/loro.rs
index a0e78360..85d65c48 100644
--- a/crates/loro-core/src/loro.rs
+++ b/crates/loro-core/src/loro.rs
@@ -2,10 +2,10 @@ use std::sync::{Arc, RwLock};
 
 use crate::LoroValue;
 use fxhash::FxHashMap;
-use rle::RleVecWithIndex;
+
 
 use crate::{
-    change::{Change, ChangeMergeCfg},
+    change::{Change},
     configure::Configure,
     container::{list::List, map::Map, text::Text, ContainerIdRaw, ContainerType},
     event::{Observer, SubscriptionID},
diff --git a/crates/loro-core/src/value.rs b/crates/loro-core/src/value.rs
index d1ddc501..4039765d 100644
--- a/crates/loro-core/src/value.rs
+++ b/crates/loro-core/src/value.rs
@@ -6,7 +6,6 @@ use serde::{de::VariantAccess, ser::SerializeStruct, Deserialize, Serialize};
 
 use crate::{
     container::{registry::ContainerRegistry, ContainerID},
-    context::Context,
     delta::DeltaItem,
     event::{Diff, Index, Path},
     Container,