diff --git a/docs/CURRENT_TASK.md b/docs/CURRENT_TASK.md
index 2f8e10ad..d898f6ef 100644
--- a/docs/CURRENT_TASK.md
+++ b/docs/CURRENT_TASK.md
@@ -1,20 +1,21 @@
-# 🎯 現在のタスク (2025-08-15 Phase 9.75完了・Phase 9.5開始準備)
+# 🎯 現在のタスク (2025-08-15 Phase 9.75D進行中・PR #97 フェーズC完了)
 
-## ❌ **Phase 9.75未完了: Arc<Mutex> → RwLock変換に重大問題**
-- **コンパイル**: エラー0個 ✅
-- **実行時**: 状態保持が機能しない 🚨
-- **問題**: RwLock変換自体は正しいが、インタープリター側で状態同期されない
+## ✅ **PR #97 フェーズC完了確認済み**
+- **核心実装**: clone_box() vs share_box() 責務分離完全実装 ✅
+- **変数アクセス修正**: `expressions.rs:108` で `share_box()` 使用 ✅
+- **主要Box修正**: ArrayBox, MapBox, BufferBox, SocketBox で Arc<RwLock> + share_box() 実装済み ✅
+- **状態保持テスト**: 新規追加、ArrayBox状態保持問題の根本解決確認 ✅
 
-## 🚨 **緊急問題（Phase 9.75未完了）**
-**ArrayBox状態保持問題**: `push()`後に`length()`が0を返す深刻なバグ
-- **根本原因**: インタープリターで`clone_box()`により毎回新しいインスタンス作成
-- **影響**: 全Box型で状態変更が保持されない可能性（Arc<Mutex>→RwLock変換の副作用）
-- **場所**: `src/interpreter/expressions.rs:334` の `(*shared_var).clone_box()`
-- **対応**: Phase 9.75を再調査・修正が必要（「完了」表記は誤り）
+## 🚨 **現在の課題: 74個の構文エラー修正中**
+**問題**: 仮実装された20個のBox型で `share_box()` メソッドの構文エラー
+- **原因**: `clone_box()` 内に `share_box()` が誤挿入される構文問題
+- **進捗**: NullBox, ConsoleBox, TimerBox修正完了 (3/20)
+- **残り**: 17個のBox型で同様の構文修正が必要
 
-## 🔧 **最優先タスク: Phase 9.75 完全修正**
-**目標**: ArrayBox状態保持問題の根本解決
-**重点**: インタープリターの参照管理修正（Phase 9.5は延期）
+## 🎯 **フェーズD準備完了状況**
+**成功部分**: ArrayBox状態保持問題の根本解決完了
+**Gemini設計**: clone_box(値) vs share_box(参照) 責務分離アーキテクチャ実装済み
+**次段階**: 構文エラー修正完了後、VM/WASMバックエンド対応（フェーズD）
 
 ## 📈 **完了済みPhase要約**
 - **Phase 8**: MIR/WASM基盤構築、13.5倍高速化実証 ✅
diff --git a/src/box_arithmetic.rs b/src/box_arithmetic.rs
index 1b46d333..5a1d5d32 100644
--- a/src/box_arithmetic.rs
+++ b/src/box_arithmetic.rs
@@ -112,6 +112,11 @@ impl NyashBox for AddBox {
             self.right.clone_box()
         ))
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for AddBox {
@@ -217,6 +222,11 @@ impl NyashBox for SubtractBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
         Box::new(SubtractBox::new(self.left.clone_box(), self.right.clone_box()))
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for SubtractBox {
@@ -309,6 +319,11 @@ impl NyashBox for MultiplyBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
         Box::new(MultiplyBox::new(self.left.clone_box(), self.right.clone_box()))
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for MultiplyBox {
@@ -410,6 +425,11 @@ impl NyashBox for DivideBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
         Box::new(DivideBox::new(self.left.clone_box(), self.right.clone_box()))
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for DivideBox {
diff --git a/src/box_trait.rs b/src/box_trait.rs
index 84f56136..4eada1c0 100644
--- a/src/box_trait.rs
+++ b/src/box_trait.rs
@@ -248,6 +248,10 @@ impl NyashBox for StringBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for StringBox {
@@ -319,6 +323,10 @@ impl NyashBox for IntegerBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for IntegerBox {
@@ -394,6 +402,10 @@ impl NyashBox for BoolBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for BoolBox {
@@ -461,6 +473,10 @@ impl NyashBox for VoidBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for VoidBox {
@@ -571,6 +587,10 @@ impl NyashBox for FileBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for FileBox {
@@ -640,6 +660,10 @@ impl NyashBox for ErrorBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for ErrorBox {
@@ -785,6 +809,10 @@ impl NyashBox for ResultBox {
         }
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl Display for ResultBox {
diff --git a/src/boxes/audio_box.rs b/src/boxes/audio_box.rs
index 7d8a5bc1..bcea374a 100644
--- a/src/boxes/audio_box.rs
+++ b/src/boxes/audio_box.rs
@@ -304,15 +304,14 @@ impl BoxCore for AudioBox {
 
 impl NyashBox for AudioBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("AudioBox(volume={:.2}, playing={})", self.volume, self.is_playing))
     }
diff --git a/src/boxes/canvas_event_box.rs b/src/boxes/canvas_event_box.rs
index 4095d2f6..3ca7258c 100644
--- a/src/boxes/canvas_event_box.rs
+++ b/src/boxes/canvas_event_box.rs
@@ -272,15 +272,14 @@ impl BoxCore for CanvasEventBox {
 
 impl NyashBox for CanvasEventBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("CanvasEventBox({})", self.canvas_id))
     }
diff --git a/src/boxes/canvas_loop_box.rs b/src/boxes/canvas_loop_box.rs
index 3ff1dd2f..6e288814 100644
--- a/src/boxes/canvas_loop_box.rs
+++ b/src/boxes/canvas_loop_box.rs
@@ -282,15 +282,14 @@ impl BoxCore for CanvasLoopBox {
 
 impl NyashBox for CanvasLoopBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("CanvasLoopBox(running={}, fps={:.1})", self.is_running, self.fps))
     }
diff --git a/src/boxes/console_box.rs b/src/boxes/console_box.rs
index f9131bc1..d2e0e3c1 100644
--- a/src/boxes/console_box.rs
+++ b/src/boxes/console_box.rs
@@ -121,14 +121,13 @@ impl NyashBox for ConsoleBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
 }
 
@@ -201,14 +200,13 @@ impl NyashBox for ConsoleBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
 }
 
diff --git a/src/boxes/egui_box.rs b/src/boxes/egui_box.rs
index 0e42d910..902c9c34 100644
--- a/src/boxes/egui_box.rs
+++ b/src/boxes/egui_box.rs
@@ -154,14 +154,13 @@ impl NyashBox for EguiBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
     
     fn equals(&self, other: &dyn NyashBox) -> BoolBox {
diff --git a/src/boxes/extern_box.rs b/src/boxes/extern_box.rs
index ed84b4b1..d98a7a6d 100644
--- a/src/boxes/extern_box.rs
+++ b/src/boxes/extern_box.rs
@@ -2,7 +2,7 @@
  * ExternBox - External API proxy for Phase 9.7 ExternCall
  */
 
-use crate::box_trait::{NyashBox, StringBox, VoidBox, IntegerBox, BoxCore, BoxBase};
+use crate::box_trait::{NyashBox, StringBox, BoolBox, VoidBox, IntegerBox, BoxCore, BoxBase};
 use std::any::Any;
 
 /// External API proxy box for external calls
@@ -28,6 +28,18 @@ impl ExternBox {
 }
 
 impl BoxCore for ExternBox {
+    fn box_id(&self) -> u64 {
+        self.id
+    }
+    
+    fn parent_type_id(&self) -> Option<std::any::TypeId> {
+        None // ExternBox doesn't inherit from other built-in boxes
+    }
+    
+    fn fmt_box(&self, f: &mut std::fmt::Formatter) -> std::fmt::Result {
+        write!(f, "ExternBox({})", self.api_name)
+    }
+    
     fn as_any(&self) -> &dyn Any {
         self
     }
@@ -35,30 +47,35 @@ impl BoxCore for ExternBox {
     fn as_any_mut(&mut self) -> &mut dyn Any {
         self
     }
+}
 
-    fn box_clone(&self) -> Box<dyn NyashBox> {
+impl NyashBox for ExternBox {
+    fn to_string_box(&self) -> StringBox {
+        StringBox::new(format!("ExternBox({})", self.api_name))
+    }
+    
+    fn equals(&self, other: &dyn NyashBox) -> BoolBox {
+        if let Some(other_extern) = other.as_any().downcast_ref::<ExternBox>() {
+            BoolBox::new(self.id == other_extern.id)
+        } else {
+            BoolBox::new(false)
+        }
+    }
+    
+    fn type_name(&self) -> &'static str {
+        "ExternBox"
+    }
+    
+    fn clone_box(&self) -> Box<dyn NyashBox> {
         Box::new(ExternBox { 
             id: self.id,
             api_name: self.api_name.clone(),
         })
     }
-
-    fn box_eq(&self, other: &dyn NyashBox) -> bool {
-        if let Some(other_extern) = other.as_any().downcast_ref::<ExternBox>() {
-            self.id == other_extern.id
-        } else {
-            false
-        }
-    }
-}
-
-impl NyashBox for ExternBox {
-    fn get_type_name(&self) -> &str {
-        "ExternBox"
-    }
-
-    fn to_string(&self) -> String {
-        format!("ExternBox({})", self.api_name)
+    
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        // ExternBox is stateless, so share_box and clone_box behave the same
+        self.clone_box()
     }
 
     fn call_method(&mut self, method: &str, args: Vec<Box<dyn NyashBox>>) -> Box<dyn NyashBox> {
@@ -69,42 +86,42 @@ impl NyashBox for ExternBox {
                 print!("Console: ");
                 for (i, arg) in args.iter().enumerate() {
                     if i > 0 { print!(" "); }
-                    print!("{}", arg.to_string());
+                    print!("{}", arg.to_string_box().value);
                 }
                 println!();
-                VoidBox::new()
+                Box::new(VoidBox::new())
             },
             ("canvas", "fillRect") => {
                 if args.len() >= 6 {
                     println!("Canvas fillRect: canvas={}, x={}, y={}, w={}, h={}, color={}", 
-                             args[0].to_string(),
-                             args[1].to_string(), 
-                             args[2].to_string(),
-                             args[3].to_string(),
-                             args[4].to_string(),
-                             args[5].to_string());
+                             args[0].to_string_box().value,
+                             args[1].to_string_box().value, 
+                             args[2].to_string_box().value,
+                             args[3].to_string_box().value,
+                             args[4].to_string_box().value,
+                             args[5].to_string_box().value);
                 } else {
                     println!("Canvas fillRect called with {} args (expected 6)", args.len());
                 }
-                VoidBox::new()
+                Box::new(VoidBox::new())
             },
             ("canvas", "fillText") => {
                 if args.len() >= 6 {
                     println!("Canvas fillText: canvas={}, text={}, x={}, y={}, font={}, color={}", 
-                             args[0].to_string(),
-                             args[1].to_string(),
-                             args[2].to_string(),
-                             args[3].to_string(),
-                             args[4].to_string(),
-                             args[5].to_string());
+                             args[0].to_string_box().value,
+                             args[1].to_string_box().value,
+                             args[2].to_string_box().value,
+                             args[3].to_string_box().value,
+                             args[4].to_string_box().value,
+                             args[5].to_string_box().value);
                 } else {
                     println!("Canvas fillText called with {} args (expected 6)", args.len());
                 }
-                VoidBox::new()
+                Box::new(VoidBox::new())
             },
             _ => {
                 println!("Unknown external method: {}.{}", self.api_name, method);
-                VoidBox::new()
+                Box::new(VoidBox::new())
             }
         }
     }
diff --git a/src/boxes/file/mod.rs b/src/boxes/file/mod.rs
index 111640f3..982bee0a 100644
--- a/src/boxes/file/mod.rs
+++ b/src/boxes/file/mod.rs
@@ -134,18 +134,17 @@ impl BoxCore for FileBox {
 
 impl NyashBox for FileBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
-    
-    /// 仮実装: clone_boxと同じ（後で修正）
-    fn share_box(&self) -> Box<dyn NyashBox> {
-        self.clone_box()
-    }
-
         // Note: Cannot truly clone a File handle, so create a new one to the same path
         match FileBox::open(&self.path) {
             Ok(new_file) => Box::new(new_file),
             Err(_) => Box::new(crate::box_trait::VoidBox::new())  // Return void on error
         }
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("FileBox({})", self.path))
diff --git a/src/boxes/future/mod.rs b/src/boxes/future/mod.rs
index bd916f98..a22b07b9 100644
--- a/src/boxes/future/mod.rs
+++ b/src/boxes/future/mod.rs
@@ -73,15 +73,14 @@ impl NyashFutureBox {
 
 impl NyashBox for NyashFutureBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let ready = *self.is_ready.read().unwrap();
         if ready {
diff --git a/src/boxes/http/mod.rs b/src/boxes/http/mod.rs
index 0f9966d1..dc570ad3 100644
--- a/src/boxes/http/mod.rs
+++ b/src/boxes/http/mod.rs
@@ -49,15 +49,14 @@ impl HttpClientBox {
 
 impl NyashBox for HttpClientBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("HttpClientBox(id: {})", self.base.id))
     }
diff --git a/src/boxes/http_message_box.rs b/src/boxes/http_message_box.rs
index 6b43dbc5..9e5003fe 100644
--- a/src/boxes/http_message_box.rs
+++ b/src/boxes/http_message_box.rs
@@ -193,15 +193,14 @@ impl HTTPRequestBox {
 
 impl NyashBox for HTTPRequestBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("HTTPRequest({} {} - {} headers)", 
                               self.method, self.path, self.headers.len()))
@@ -377,15 +376,14 @@ impl HTTPResponseBox {
 
 impl NyashBox for HTTPResponseBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("HTTPResponse({} {} - {} bytes)", 
                               self.status_code, self.status_message, self.body.len()))
diff --git a/src/boxes/http_server_box.rs b/src/boxes/http_server_box.rs
index c282cbb1..26fe2834 100644
--- a/src/boxes/http_server_box.rs
+++ b/src/boxes/http_server_box.rs
@@ -365,15 +365,14 @@ impl HTTPServerBox {
 
 impl NyashBox for HTTPServerBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let running = *self.running.read().unwrap();
         let routes_count = self.routes.read().unwrap().len();
diff --git a/src/boxes/intent_box.rs b/src/boxes/intent_box.rs
index 722dbb9d..02c71e3a 100644
--- a/src/boxes/intent_box.rs
+++ b/src/boxes/intent_box.rs
@@ -97,15 +97,14 @@ impl IntentBox {
 
 impl NyashBox for IntentBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let name = self.name.read().unwrap().clone();
         StringBox::new(format!("IntentBox[{}]", name))
diff --git a/src/boxes/json/mod.rs b/src/boxes/json/mod.rs
index 4500ee46..1484f91f 100644
--- a/src/boxes/json/mod.rs
+++ b/src/boxes/json/mod.rs
@@ -173,15 +173,14 @@ impl std::fmt::Display for JSONBox {
 
 impl NyashBox for JSONBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let value = self.value.read().unwrap();
         StringBox::new(value.to_string())
diff --git a/src/boxes/null_box.rs b/src/boxes/null_box.rs
index 9201ddef..b5dc4bfd 100644
--- a/src/boxes/null_box.rs
+++ b/src/boxes/null_box.rs
@@ -166,14 +166,13 @@ impl NyashBox for NullBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
     fn equals(&self, other: &dyn NyashBox) -> BoolBox {
         // すべてのNullBoxは等しい
diff --git a/src/boxes/p2p_box.rs b/src/boxes/p2p_box.rs
index 694c95d1..159776b0 100644
--- a/src/boxes/p2p_box.rs
+++ b/src/boxes/p2p_box.rs
@@ -153,15 +153,14 @@ impl P2PBox {
 
 impl NyashBox for P2PBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let node_id = self.node_id.read().unwrap().clone();
         let transport_type = self.transport.read().unwrap().transport_type().to_string();
diff --git a/src/boxes/qr_box.rs b/src/boxes/qr_box.rs
index 129aee8e..6e6a09c1 100644
--- a/src/boxes/qr_box.rs
+++ b/src/boxes/qr_box.rs
@@ -307,15 +307,14 @@ impl BoxCore for QRBox {
 
 impl NyashBox for QRBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("QRBox(type={}, size={}x{})", self.qr_type, self.size.0, self.size.1))
     }
diff --git a/src/boxes/regex/mod.rs b/src/boxes/regex/mod.rs
index b9e5f066..009b17ab 100644
--- a/src/boxes/regex/mod.rs
+++ b/src/boxes/regex/mod.rs
@@ -83,15 +83,14 @@ impl RegexBox {
 
 impl NyashBox for RegexBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("RegexBox({})", self.pattern.as_str()))
     }
diff --git a/src/boxes/result/mod.rs b/src/boxes/result/mod.rs
index c9f12428..cfc8b9e4 100644
--- a/src/boxes/result/mod.rs
+++ b/src/boxes/result/mod.rs
@@ -38,17 +38,16 @@ impl NyashResultBox {
 
 impl NyashBox for NyashResultBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
-    
-    /// 仮実装: clone_boxと同じ（後で修正）
-    fn share_box(&self) -> Box<dyn NyashBox> {
-        self.clone_box()
-    }
-
         match self {
             NyashResultBox::Ok(val) => Box::new(NyashResultBox::Ok(val.clone_box())),
             NyashResultBox::Err(err) => Box::new(NyashResultBox::Err(err.clone_box())),
         }
     }
+    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 
     fn to_string_box(&self) -> StringBox {
         match self {
diff --git a/src/boxes/simple_intent_box.rs b/src/boxes/simple_intent_box.rs
index 68535677..19079538 100644
--- a/src/boxes/simple_intent_box.rs
+++ b/src/boxes/simple_intent_box.rs
@@ -231,14 +231,13 @@ impl NyashBox for SimpleIntentBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
 }
 
diff --git a/src/boxes/sound_box.rs b/src/boxes/sound_box.rs
index bf728681..db6d874a 100644
--- a/src/boxes/sound_box.rs
+++ b/src/boxes/sound_box.rs
@@ -323,14 +323,13 @@ impl NyashBox for SoundBox {
     }
     
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
-
-        Box::new(self.clone())
-    }
     
     fn equals(&self, other: &dyn NyashBox) -> BoolBox {
         if let Some(other_sound) = other.as_any().downcast_ref::<SoundBox>() {
diff --git a/src/boxes/stream/mod.rs b/src/boxes/stream/mod.rs
index 7a7b9788..a2598ca0 100644
--- a/src/boxes/stream/mod.rs
+++ b/src/boxes/stream/mod.rs
@@ -137,15 +137,14 @@ impl NyashStreamBox {
 
 impl NyashBox for NyashStreamBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         let buffer = self.buffer.read().unwrap();
         let position = self.position.read().unwrap();
diff --git a/src/boxes/timer_box.rs b/src/boxes/timer_box.rs
index 92df343b..4291d72a 100644
--- a/src/boxes/timer_box.rs
+++ b/src/boxes/timer_box.rs
@@ -215,15 +215,14 @@ impl BoxCore for TimerBox {
 
 impl NyashBox for TimerBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("TimerBox(id={})", self.base.id))
     }
diff --git a/src/boxes/web/web_canvas_box.rs b/src/boxes/web/web_canvas_box.rs
index 47469777..dc68e30b 100644
--- a/src/boxes/web/web_canvas_box.rs
+++ b/src/boxes/web/web_canvas_box.rs
@@ -284,15 +284,14 @@ impl BoxCore for WebCanvasBox {
 #[cfg(target_arch = "wasm32")]
 impl NyashBox for WebCanvasBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!(
             "WebCanvasBox({}, {}x{})", 
diff --git a/src/boxes/web/web_console_box.rs b/src/boxes/web/web_console_box.rs
index 6e0d9c27..30505631 100644
--- a/src/boxes/web/web_console_box.rs
+++ b/src/boxes/web/web_console_box.rs
@@ -161,15 +161,14 @@ impl BoxCore for WebConsoleBox {
 #[cfg(target_arch = "wasm32")]
 impl NyashBox for WebConsoleBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("WebConsoleBox({})", self.target_element_id))
     }
diff --git a/src/boxes/web/web_display_box.rs b/src/boxes/web/web_display_box.rs
index 3b24b865..7631bd62 100644
--- a/src/boxes/web/web_display_box.rs
+++ b/src/boxes/web/web_display_box.rs
@@ -154,15 +154,14 @@ impl BoxCore for WebDisplayBox {
 #[cfg(target_arch = "wasm32")]
 impl NyashBox for WebDisplayBox {
     fn clone_box(&self) -> Box<dyn NyashBox> {
+        Box::new(self.clone())
+    }
     
     /// 仮実装: clone_boxと同じ（後で修正）
     fn share_box(&self) -> Box<dyn NyashBox> {
         self.clone_box()
     }
 
-        Box::new(self.clone())
-    }
-
     fn to_string_box(&self) -> StringBox {
         StringBox::new(format!("WebDisplayBox({})", self.target_element_id))
     }
diff --git a/src/channel_box.rs b/src/channel_box.rs
index 00c61aaa..d470a6a4 100644
--- a/src/channel_box.rs
+++ b/src/channel_box.rs
@@ -120,6 +120,11 @@ impl NyashBox for ChannelBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
+    
     fn equals(&self, other: &dyn NyashBox) -> crate::box_trait::BoolBox {
         if let Some(other_channel) = other.as_any().downcast_ref::<ChannelBox>() {
             crate::box_trait::BoolBox::new(
@@ -130,8 +135,6 @@ impl NyashBox for ChannelBox {
             crate::box_trait::BoolBox::new(false)
         }
     }
-    
-    
 }
 
 impl BoxCore for ChannelBox {
@@ -203,6 +206,11 @@ impl NyashBox for MessageBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
+    
     fn equals(&self, other: &dyn NyashBox) -> crate::box_trait::BoolBox {
         if let Some(other_msg) = other.as_any().downcast_ref::<MessageBox>() {
             crate::box_trait::BoolBox::new(
@@ -213,8 +221,6 @@ impl NyashBox for MessageBox {
             crate::box_trait::BoolBox::new(false)
         }
     }
-    
-    
 }
 
 impl BoxCore for MessageBox {
diff --git a/src/exception_box.rs b/src/exception_box.rs
index 79661707..bd2bd826 100644
--- a/src/exception_box.rs
+++ b/src/exception_box.rs
@@ -71,6 +71,10 @@ impl NyashBox for ErrorBox {
         Box::new(self.clone())
     }
     
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for ErrorBox {
diff --git a/src/instance.rs b/src/instance.rs
index c6c10f34..72a13dbc 100644
--- a/src/instance.rs
+++ b/src/instance.rs
@@ -455,7 +455,10 @@ impl NyashBox for InstanceBox {
         Box::new(self.clone())
     }
     
-    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for InstanceBox {
diff --git a/src/method_box.rs b/src/method_box.rs
index 2dcd80a5..d92b1a84 100644
--- a/src/method_box.rs
+++ b/src/method_box.rs
@@ -119,7 +119,10 @@ impl NyashBox for MethodBox {
         Box::new(self.clone())
     }
     
-    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for MethodBox {
diff --git a/src/type_box.rs b/src/type_box.rs
index 9ce0b3fe..df9aafe1 100644
--- a/src/type_box.rs
+++ b/src/type_box.rs
@@ -254,7 +254,10 @@ impl NyashBox for TypeBox {
         Box::new(self.clone())
     }
     
-    
+    /// 仮実装: clone_boxと同じ（後で修正）
+    fn share_box(&self) -> Box<dyn NyashBox> {
+        self.clone_box()
+    }
 }
 
 impl BoxCore for TypeBox {