hakorune/docs/development/current/main/phases/phase-29ac

Phase 29ac: JoinIR thaw plan (Pattern6/7 near-miss → PASS)

Goal: Convert freeze-fixed Pattern6/7 near-miss cases into PASS while keeping contracts intact (no by-name or silent fallback).

Target list (current freeze fixtures)

• apps/tests/phase29ab_pattern6_firstfail_min.hako
• apps/tests/phase29ab_pattern6_matchscan_firstfail_min.hako
• apps/tests/phase29ab_pattern7_firstfail_min.hako

Pass order (recommended)

1. Pattern6 reverse scan
   • Plan/Normalizer: add reverse support (i >= 0, step i = i - 1).
   • Smoke: phase29ab_pattern6_reverse_firstfail_min now OK PASS (RC=1).
2. Pattern6 matchscan missing step
   • Decide whether step can be synthesized safely; otherwise mark out-of-scope and add explicit contract note.
3. Pattern7 split-scan near-miss
   • Resolve then/else update mismatches without relaxing contracts.

Commands

• ./tools/smokes/v2/run.sh --profile integration --filter "phase29ab_pattern6_*"
• ./tools/smokes/v2/run.sh --profile integration --filter "phase29ab_pattern7_*"