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docs(joinir): Phase 218 JsonParser if-sum investigation complete
Completes Phase 218 investigation: Identifies root cause preventing
AST-based if-sum lowerer from activating.
## Investigation Summary
### Test Case Created
- File: apps/tests/phase218_json_if_sum_min.hako
- Pattern: JsonParser-style conditional accumulation (sum = sum + i)
- Expected: RC=10, Actual: RC=0 (blocked by phantom carrier)
### Root Cause Identified: Phantom Carrier Bug
**Problem**: AST-based if-sum lowerer (Phase 213) never activates
**Cause Chain**:
1. loop_update_summary.rs uses name-based heuristics
2. Detects phantom "count" variable (doesn't exist in code)
3. counter_count() returns 2 instead of 1 (i + phantom "count")
4. is_simple_if_sum_pattern() returns false
5. Dual-mode dispatch uses legacy fallback instead of AST lowerer
**Evidence**:
```
Debug output shows hardcoded template "i % 2 == 1" (legacy lowerer)
Not from AST extraction (AST-based lowerer never called)
```
### Critical Discovery
**Phase 216 claim "RC=2 ✅" for phase212_if_sum_min.hako is false**
- Current execution: RC=0 (wrong)
- Expected: RC=2
- Indicates: Phase 213-217 "success" was actually legacy lowerer
### Documentation Gap
Phase 216/217 tests may not have been executed correctly, or regression
occurred. All "if-sum" patterns are currently broken due to phantom
carrier detection blocking AST lowerer activation.
## Files Created
1. apps/tests/phase218_json_if_sum_min.hako - Test case
2. docs/development/current/main/phase218-jsonparser-if-sum-min.md - Investigation report
## Files Updated
1. CURRENT_TASK.md - Phase 218 investigation results
2. joinir-architecture-overview.md - Phase 218 entry
## Next Steps: Phase 219
**Target**: Fix phantom carrier detection in loop_update_summary.rs
**Fix**: Remove name-based heuristics, use assignment-based detection only
**Expected Result**: Both phase212 and phase218 tests pass with correct RC
## Lessons Learned
1. Documentation can become stale - verify test results
2. Silent fallbacks hide bugs - dual-mode needs clear activation logging
3. Name heuristics are fragile - prefer structural analysis
🤖 Generated with [Claude Code](https://claude.com/claude-code)
Co-Authored-By: Claude Sonnet 4.5 <noreply@anthropic.com>
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2025-12-10 02:07:28 +09:00 |
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