hakorune/docs/private/roadmap/phases/phase-20.24/PLAN.md

Phase 20.24 — Parser削除（Plan: A→B→C)

Goal

• Remove Rust parser/AST and switch to Hakorune parser with measurable safety.

A. Gate & Validate（Done）

• Wire --parser=hako to selfhost FlowEntry path
• Add opt‑in parity canaries（quick: return/if/binop; integration: return）
• Update quick allowlist with opt‑in toggle

B. Observe & Stabilize（Pending）

• Nightly parity on representative sources（5–10 cases）
• Add CI job for quick parity (both backends)
• Document known limitations and stable error wording

C. Flip & Clean（Pending）

• Default to Hakorune parser (Rust via ENV legacy only)
• Archive→delete src/parser/, src/ast/ after one release
• Scrub imports; rebuild; full smoke; announce

Notes

• Fail‑Fast is mandatory; no silent fallbacks at the boundary.
• CLI takes precedence; ENV is alias/opt‑in only.
• Keep changes minimal and reversible between A→B.