ResultBox migration (stage 0): suppress legacy deprecation warnings in box_trait impls; keep dual handling in VM. Fix verifier Display for SuspiciousBarrierContext. Expose VM stats fields to vm_stats module. CLI core_ci guide and script in place.

src/backend/vm.rs

@@ -203,9 +203,9 @@ pub struct VM {
     /// Active MIR module during execution (for function calls)
     module: Option<MirModule>,
     /// Instruction execution counters (by MIR opcode)
-    instr_counter: std::collections::HashMap<&'static str, usize>,
+    pub(super) instr_counter: std::collections::HashMap<&'static str, usize>,
     /// Execution start time for optional stats
-    exec_start: Option<Instant>,
+    pub(super) exec_start: Option<Instant>,
     // Phase 9.78a: Add unified Box handling components
     // TODO: Re-enable when interpreter refactoring is complete
     // /// Box registry for creating all Box types

src/box_trait.rs

@@ -729,6 +729,7 @@ pub struct ResultBox {
     base: BoxBase,
 }
 
+#[allow(deprecated)]
 impl ResultBox {
     pub fn new_success(value: Box<dyn NyashBox>) -> Self {
         Self {
@@ -772,6 +773,7 @@ impl ResultBox {
     }
 }
 
+#[allow(deprecated)]
 impl BoxCore for ResultBox {
     fn box_id(&self) -> u64 {
         self.base.id
@@ -794,6 +796,7 @@ impl BoxCore for ResultBox {
     }
 }
 
+#[allow(deprecated)]
 impl NyashBox for ResultBox {
     fn to_string_box(&self) -> StringBox {
         if self.is_success {
@@ -863,6 +866,7 @@ impl NyashBox for ResultBox {
     }
 }
 
+#[allow(deprecated)]
 impl Display for ResultBox {
     fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
         self.fmt_box(f)

src/mir/loop_builder.rs

@@ -82,11 +82,14 @@ impl<'a> LoopBuilder<'a> {
         // 7. ループボディの構築
         self.set_current_block(body_id)?;
         self.emit_safepoint()?;
-        
+
         // ボディをビルド
         for stmt in body {
             self.build_statement(stmt)?;
         }
+        // latchブロックのスナップショットを保存（phi入力解決用）
+        let latch_snapshot = self.get_current_variable_map();
+        self.block_var_maps.insert(body_id, latch_snapshot);
         
         // 8. Latchブロック（ボディの最後）からHeaderへ戻る
         let latch_id = self.current_block()?;
@@ -114,6 +117,8 @@ impl<'a> LoopBuilder<'a> {
     ) -> Result<(), String> {
         // 現在の変数マップから、ループで使用される可能性のある変数を取得
         let current_vars = self.get_current_variable_map();
+        // preheader時点のスナップショット（後でphi入力の解析に使う）
+        self.block_var_maps.insert(preheader_id, current_vars.clone());
         
         // 各変数に対して不完全なPhi nodeを作成
         let mut incomplete_phis = Vec::new();
@@ -271,9 +276,12 @@ impl<'a> LoopBuilder<'a> {
         self.parent_builder.variable_map.insert(name, value);
     }
     
-    fn get_variable_at_block(&self, name: &str, _block_id: BasicBlockId) -> Option<ValueId> {
-        // 簡易実装：現在の変数マップから取得
-        // TODO: 本来はブロックごとの変数マップを管理すべき
+    fn get_variable_at_block(&self, name: &str, block_id: BasicBlockId) -> Option<ValueId> {
+        // まずブロックごとのスナップショットを優先
+        if let Some(map) = self.block_var_maps.get(&block_id) {
+            if let Some(v) = map.get(name) { return Some(*v); }
+        }
+        // フォールバック：現在の変数マップ（単純ケース用）
         self.parent_builder.variable_map.get(name).copied()
     }
     
@@ -285,4 +293,4 @@ impl<'a> LoopBuilder<'a> {
     fn build_statement(&mut self, stmt: ASTNode) -> Result<ValueId, String> {
         self.parent_builder.build_expression(stmt)
     }
-}
+}

src/mir/verification.rs

@@ -589,6 +589,9 @@ impl std::fmt::Display for VerificationError {
             VerificationError::InvalidBarrierPointer { ptr, block, instruction_index, reason } => {
                 write!(f, "Invalid Barrier pointer {} in block {} at {}: {}", ptr, block, instruction_index, reason)
             },
+            VerificationError::SuspiciousBarrierContext { block, instruction_index, note } => {
+                write!(f, "Suspicious Barrier context in block {} at {}: {}", block, instruction_index, note)
+            },
         }
     }
 }