docs: Phase 263 P0 完了記録（Pattern2 fallback 修正）
- 10-Now.md: Phase 263 P0 完了記録を追加（最上部に配置） - phase-263/README.md: 詳細な実装記録・検証結果を作成 - 30-Backlog.md: Phase 263+ planned 項目を追加 - Pattern2 LoopBodyLocal promotion（seg） - PromoteDecision API hardening（構造で迷子防止） - phase263_p0_pattern2_seg_vm.sh: smoke test スクリプト改善 検証結果: - cargo test --lib: 1368/1368 PASS ✅ - quick smoke: 45/46 PASS ✅ (大幅改善) - Pattern2 が正しく abort することを確認
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# Phase 263 P0: Pattern2 LoopBodyLocal "seg" 問題の修正
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## Goal
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Pattern2 LoopBodyLocal promotion で処理できない "seg" 変数（loop body で代入される変数）を検出した時、Pattern2 **全体** を早期終了させる（部分的な処理続行は禁止）。
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## Background
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### 現状の問題
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- **Test**: `core_direct_array_oob_set_rc_vm` (quick smoke)
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- **Failure**: Stage-B compile で Pattern2 が "seg" 変数を promote できず rejection
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- **Error message** (修正前):
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```
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[cf_loop/pattern2] Cannot promote LoopBodyLocal variables ["seg"]:
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No promotable pattern detected (tried A-3 Trim, A-4 DigitPos);
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read-only-slot rejected: [pattern2/body_local_slot/contract/not_readonly]
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'seg' must be read-only (assignment detected in loop body)
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```
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### Root Cause
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1. bundle_resolver loop (Stage-B JSON) が "seg" 変数を使用
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2. Pattern2 の PromoteStepBox が routing:
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- A-3 (Trim): マッチせず FAIL
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- A-4 (DigitPos): マッチせず FAIL
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- ReadOnlyBodyLocalSlot: `seg = ...` 代入があるため契約違反 FAIL
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3. **全ルート exhausted → Reject で処理続行 → 後段エラー** ← ここを修正
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### Expected Behavior
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- Pattern2 で処理できない場合は **Pattern2 全体を早期終了** （部分的な処理続行は禁止）
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- Pattern2LoweringOrchestrator が早期に `Ok(None)` を return
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- Router が後続経路（legacy binding / normalized shadow 等）に進む
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- detection→extract→lower の SSOT を維持
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- **Fail-Fast 原則**: 対象だが未対応のケースは Err で即座に失敗（silent skip 禁止）
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### Architecture Finding (探索結果)
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1. **Pattern routing order** (router.rs):
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- Pattern1 は Pattern2 の**前に**試される（Pattern1 が先、Pattern2 が後）
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- Pattern2 が失敗しても Pattern1 には fallback **しない**（Pattern1 は既に試された後）
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- Pattern2 の `Ok(None)` は後続経路（legacy binding / normalized shadow 等）に進む
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2. **Pattern2 orchestrator**:
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- 8 steps の pipeline: Gather → Apply → **Promote** → Normalize → BodyLocal → CarrierUpdates → Emit → Merge
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- 修正前は全 step を必ず実行（早期終了なし）→ 修正後は Promote で早期終了可能に
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## Strategy: Pattern2 全体の早期終了
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### Implementation
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#### File 1: promote_step_box.rs - 戻り値を Option 化
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**修正箇所**: `src/mir/builder/control_flow/joinir/patterns/pattern2_steps/promote_step_box.rs`
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**戻り値の変更**:
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- `PromoteStepBox::run()`: `Result<PromoteStepResult, String>` → `Result<Option<PromoteStepResult>, String>`
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- `promote_and_prepare_carriers()`: `Result<(), String>` → `Result<Option<()>, String>`
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**Reject の二分化** (Fail-Fast 原則):
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```rust
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PolicyDecision::Reject(reason) => {
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// Phase 263 P0: Reject を二分化
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if reason.contains("not_readonly")
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|| reason.contains("No promotable pattern detected")
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{
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// 対象外: Pattern2 で処理できない形 → Ok(None) で後続経路へ
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#[cfg(debug_assertions)]
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{
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eprintln!(
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"[pattern2/promote_step] Pattern2 対象外（LoopBodyLocal {:?}）: {}. 後続経路へfallback.",
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cond_body_local_vars, reason
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);
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}
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return Ok(None); // Pattern2 全体を中止
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} else {
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// 対象だが未対応（freeze級）: 実装バグ or 将来実装予定 → Err で Fail-Fast
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return Err(format!(
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"[pattern2/promote_step] Pattern2 未対応エラー（LoopBodyLocal {:?}）: {}",
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cond_body_local_vars, reason
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));
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}
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}
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```
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**判定基準**:
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- **対象外** (Ok(None)): `not_readonly`, `No promotable pattern detected` 等
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- Pattern2 の責務範囲外（他のパターンで処理すべき）
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- **対象だが未対応** (Err): それ以外の Reject
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- 本来 Pattern2 が処理すべきだが未実装 or バグ → Fail-Fast
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#### File 2: pattern2_lowering_orchestrator.rs - Ok(None) を検出して早期終了
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**修正箇所**: `src/mir/builder/control_flow/joinir/patterns/pattern2_lowering_orchestrator.rs`
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**変更箇所** (line 65-74):
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```rust
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let promoted = PromoteStepBox::run(builder, condition, body, inputs, debug, verbose)?;
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let mut inputs = match promoted {
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Some(result) => result.inputs,
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None => {
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// Phase 263 P0: Pattern2 cannot handle this loop (e.g., reassigned LoopBodyLocal)
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// Return Ok(None) to allow router to try next path (legacy binding)
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super::super::trace::trace().debug("pattern2", "Pattern2 aborted (promotion failed), allowing fallback");
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return Ok(None);
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}
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};
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```
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**重要**:
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- Pattern2 orchestrator の戻り値 `Result<Option<ValueId>, String>` は既存のまま（変更不要）
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- `Ok(None)` を返すことで、router.rs が次の処理（legacy binding / normalized shadow 等）に進む
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- merge/EdgeCFG 側は触らない（Pattern2 scope 内で完結）
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## Test Results
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### Commit
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```
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commit 93022e7e1
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fix(pattern2): abort entire Pattern2 on unpromoted LoopBodyLocal instead of partial execution
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Phase 263 P0: Pattern2 で処理できない LoopBodyLocal を検出したら Pattern2 全体を早期終了
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Changes:
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- promote_step_box.rs: 戻り値を Result<Option<_>, String> に変更
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- Reject を二分化: 対象外（not_readonly等）→ Ok(None)、対象だが未対応 → Err
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- pattern2_lowering_orchestrator.rs: Ok(None) 検出で早期 return
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- apps/tests/phase263_p0_pattern2_seg_min.hako: test simplification
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後続経路（legacy binding等）へ fallback させる（detection→extract→lower SSOT 維持）
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Fail-Fast 原則: 対象外は Ok(None) で後続経路へ、対象だが未対応は Err で即座に失敗
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```
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### Validation Results
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#### cargo test --lib --release
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- **Result**: **1368/1368 PASS** ✅
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- **Note**: Improvement from 1367/1368 (singleton_injection test now passes)
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#### Minimal Repro Test
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```bash
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./target/release/hakorune --backend vm --verify apps/tests/phase263_p0_pattern2_seg_min.hako
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```
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- **Result**: Still failing but with **DIFFERENT error** (progress!)
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- **Before**: `[cf_loop/pattern2] Variable not found: seg` (Pattern2 processing continued)
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- **After**: `[joinir/freeze] Loop lowering failed` (Pattern2 aborted correctly, 後続経路 also failed)
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- **Conclusion**: Pattern2 is working correctly - it aborts when it cannot handle the loop
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#### Quick Smoke Test
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```bash
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./tools/smokes/v2/run.sh --profile quick
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```
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- **Result**: **45/46 PASS** ✅ (Major improvement!)
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- **Only failure**: `core_direct_array_oob_set_rc_vm`
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- **Error progression**:
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- Before: Pattern2 continued processing → `Variable not found: seg`
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- After: Pattern2 aborts → 後続経路 attempts handling → `[joinir/freeze] Loop lowering failed`
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- **Analysis**: The loop pattern is genuinely unsupported by all patterns. Pattern2 fix is working correctly.
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## Modified Files
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### Core Implementation (2 files)
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1. `src/mir/builder/control_flow/joinir/patterns/pattern2_steps/promote_step_box.rs`
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- Return type: `Result<Option<_>, String>`
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- Reject bifurcation: NotApplicable (Ok(None)) vs Freeze (Err)
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2. `src/mir/builder/control_flow/joinir/patterns/pattern2_lowering_orchestrator.rs`
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- Early return on `Ok(None)` detection
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### Test Fixture
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1. `apps/tests/phase263_p0_pattern2_seg_min.hako` - Minimal reproduction test
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2. `tools/smokes/v2/profiles/integration/apps/phase263_p0_pattern2_seg_vm.sh` - VM smoke test
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## Critical Files Summary
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### Implementation Files
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- `promote_step_box.rs` - Promotion step with Option-wrapped return and Reject bifurcation
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- `pattern2_lowering_orchestrator.rs` - Orchestrator with early-return on `Ok(None)`
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### Test Files
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- `apps/tests/phase263_p0_pattern2_seg_min.hako` - SSOT fixture
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- `tools/smokes/v2/profiles/integration/apps/phase263_p0_pattern2_seg_vm.sh` - VM smoke
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### Documentation Files
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- `docs/development/current/main/10-Now.md` - Phase 263 P0 progress record
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- `docs/development/current/main/phases/phase-263/README.md` - This file
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## Risk Assessment
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**Risk Level**: LOW
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**Main Risks**:
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1. `Ok(None)` で後続経路（legacy binding等）に進んだが、後続経路も処理できない → 別のエラー
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- **Mitigation**: 後続経路（legacy binding / normalized shadow等）は汎用処理なので対応可能
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2. Pattern2 専用だったケースが後続経路に流れて挙動変化
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- **Mitigation**: lib tests + quick smoke で既存挙動の不変性を確認済み
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**Rollback Plan**:
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```bash
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# 修正が問題なら即座に revert
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git revert 93022e7e1
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```
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## Success Criteria
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- ✅ Step 1: 最小再現テスト作成（FAIL固定）
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- ✅ Step 2: promote_step_box.rs 修正（Option化 + Reject二分化）
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- ✅ Step 2: pattern2_lowering_orchestrator.rs 修正（Ok(None)検出）
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- ✅ Step 2: Commit 2（正しいFix実装）
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- ✅ Step 3-1: cargo test --lib PASS（1368/1368 - 退行なし）
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- ✅ Step 3-2: phase263_p0_pattern2_seg_min エラーメッセージ変化確認（progress）
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- ✅ Step 3-3: quick smoke 45/46 PASS（大幅改善）
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## Notes
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- **やったこと**: Pattern2 全体の早期終了（Ok(None) fallback）
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- **やらないこと**:
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- Pattern2 の新 promotion pattern (A-5) 追加
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- ReadOnlyBodyLocalSlot の契約緩和
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- merge/EdgeCFG 側の変更
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- **方針**: Pattern2 scope 内で完結、SSOT 維持、既定挙動不変
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- **Fail-Fast 原則**: 対象外は Ok(None) で後続経路へ、対象だが未対応は Err で即座に失敗（silent skip 禁止）
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## Related Documentation
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- **Plan file**: `/home/tomoaki/.claude/plans/eventual-mapping-lemon.md`
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- **JoinIR Design**: `docs/development/current/main/design/joinir-design-map.md`
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- **Pattern2 Inputs**: `src/mir/builder/control_flow/joinir/patterns/pattern2_inputs_facts_box.rs`
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