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\\n> \\n> Reviewing files that changed from the base of the PR and between 59c7509d83e08fdea0f1bf859338c740942c5e33 and 4d5f0d7e6bfda49d7e461ba6dedb4f0594c0d8c7.\\n> \\n>

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📒 Files selected for processing (1)

\\n> \\n> * `docs/proposals/P-022-rust-core-migration.md`\\n> \\n>

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📝 Walkthrough

\\n\\n## Walkthrough\\n\\nThis PR revises the P-022 Rust core migration proposal document, expanding sections on migration rationale, crate topology and dependency edges, ID/index design patterns, parser and library requirements, performance/panic-mode guidance, compiler strictness tooling, and the differential oracle and migration strategy for `own-bridge`. No code changes are included.\\n\\n### Changes\\n\\n**Proposal document revision**\\n\\n|Layer / File(s)|Summary|\\n|---|---|\\n|**Rationale and crate topology**
`docs/proposals/P-022-rust-core-migration.md`|Expands the IDE-trigger rationale, freezes the OwnIR seam, and clarifies crate dependency edges for `own-ir`, `own-diagnostics`, `own-codegen`, and `own-bridge`.|\\n|**Patterns, libraries, and performance guidance**
`docs/proposals/P-022-rust-core-migration.md`|Adds newtype-index/`NonZeroU32` guidance, parser error-parity requirements, `SmallVec` caveats, and `panic=\\\"abort\\\"`/`panic=\\\"unwind\\\"` guidance plus a release profile snippet and clippy `#[allow]` plan.|\\n|**Dependency ratchet, oracle, and migration strategy**
`docs/proposals/P-022-rust-core-migration.md`|Restricts `own-bridge` consumers, clarifies snapshot-based CI oracle diffing, details the `own-bridge` migration step, and adds salsa incrementality constraints.|\\n\\n**Estimated code review effort:** 2 (Simple) | ~10 minutes\\n\\n

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🚥 Pre-merge checks | ✅ 4

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✅ Passed checks (4 passed)

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✨ Finishing Touches

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🧪 Generate unit tests (beta)

\\n\\n- [ ] Create PR with unit tests\\n- [ ] Commit unit tests in branch `claude/ownnet-execution-surfaces-adr-8kyc0n`\\n\\n

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\\n\\n\\n\\n\\n---\\n\\nThanks for using [CodeRabbit](https://coderabbit.ai?utm_source=oss&utm_medium=github&utm_campaign=PhysShell/Own.NET&utm_content=168)! It's free for OSS, and your support helps us grow. If you like it, consider giving us a shout-out.\\n\\n

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\\n\\n- [X](https://twitter.com/intent/tweet?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A&url=https%3A//coderabbit.ai)\\n- [Mastodon](https://mastodon.social/share?text=I%20just%20used%20%40coderabbitai%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20the%20proprietary%20code.%20Check%20it%20out%3A%20https%3A%2F%2Fcoderabbit.ai)\\n- [Reddit](https://www.reddit.com/submit?title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&text=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code.%20Check%20it%20out%3A%20https%3A//coderabbit.ai)\\n- [LinkedIn](https://www.linkedin.com/sharing/share-offsite/?url=https%3A%2F%2Fcoderabbit.ai&mini=true&title=Great%20tool%20for%20code%20review%20-%20CodeRabbit&summary=I%20just%20used%20CodeRabbit%20for%20my%20code%20review%2C%20and%20it%27s%20fantastic%21%20It%27s%20free%20for%20OSS%20and%20offers%20a%20free%20trial%20for%20proprietary%20code)\\n\\n

\\n\\n\\n_{Comment `@coderabbitai help` to get the list of available commands.}\\n\\n\",\"path\":null,\"side\":null,\"line\":null}{\"type\":\"pull_request_comment\",\"body\":\"\\n\\n

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🧩 Analysis chain

\\n\\n🏁 Script executed:\\n\\n```shell\\n#!/bin/bash\\nset -euo pipefail\\ncd /tmp\\nrm -rf repo\\ngit clone --depth 50 https://github.com/PhysShell/Own.NET.git repo 2>&1 | tail -5\\ncd repo\\ngh pr view 168 --repo PhysShell/Own.NET --json title,body,files -q '.files[].path' 2>&1 || true\\necho \\\"---diff stat---\\\"\\ngh pr diff 168 --repo PhysShell/Own.NET 2>&1 | head -20\\n```\\n\\nLength of output: 1857\\n\\n---\\n\\n🏁 Script executed:\\n\\n```shell\\n#!/bin/bash\\nset -uo pipefail\\ncd /tmp/repo\\necho \\\"=== FULL DIFF ===\\\"\\ngh pr diff 168 --repo PhysShell/Own.NET > /tmp/pr168.diff 2>&1\\nwc -l /tmp/pr168.diff\\ncat /tmp/pr168.diff\\necho \\\"=== REVIEW NOTES ===\\\"\\nfind . -iname 'p022-review-notes.md'\\ncat docs/notes/p022-review-notes.md 2>/dev/null | head -300\\n```\\n\\nLength of output: 29557\\n\\n---\\n\\n🏁 Script executed:\\n\\n```shell\\n#!/bin/bash\\nset -uo pipefail\\ncd /tmp/repo\\nfd -i ownir.py\\necho \\\"---\\\"\\nfd -i ownir.py -x wc -l {}\\necho \\\"--- look at schema vs beyond-schema split ---\\\"\\nfd -i ownir.py -x grep -n \\\"^class\\\\|^def\\\" {} 2>/dev/null | head -80\\n```\\n\\nLength of output: 3448\\n\\n---\\n\\n

\\n\\n`@PhysShell` I read the diff against `docs/notes/p022-review-notes.md` in full. Here's the review, organized by your three focus areas.\\n\\n## 1. `own-bridge` boundary\\n\\nThe boundary holds up. The diagram change is precise about direction:\\n\\n```\\nown-ir + own-cfg + own-analysis + own-diagnostics ─▶ own-bridge\\n```\\n\\nGiven the doc's own convention (\\\"Arrow = is depended on by\\\"), this correctly makes `own-bridge` the dependent, not a dependency of the solver — so bridge inference genuinely can't leak backward into `own-analysis`/`own-diagnostics`. The inverse constraint (\\\"nothing depends on `own-bridge` except `own-cli`\\\") is stated explicitly in the ratchet section, which is the right place to pin it (not just in prose near the crate list).\\n\\nMigration step 6 placement (between `own-diagnostics`/`own-codegen` at step 5 and `own-cli` at step 7) is correct strangler-fig order: bridge needs the solver and diagnostics ported first, and gating it on the normative-semantics write-up before porting is the right sequencing — that write-up is exactly the thing `test_ownir.py`-only pinning can't substitute for.\\n\\nOne small nit, not a defect: the crate-list line `{all of the above} ─▶ own-cli` appears directly after the `own-bridge` block, so it's implied to include it, but it's not spelled out. Given how much emphasis the doc puts on `own-bridge`'s width being deliberate, it'd read more confidently as `{all of the above, including own-bridge} ─▶ own-cli` — purely cosmetic.\\n\\n## 2. IDE-trigger consequences\\n\\nNo overclaiming found. The Why section correctly hedges the batch-vs-latency distinction (\\\"if today's CLI isn't CPU-bound on the corpus, the visible batch win may be modest\\\") rather than asserting the 10–100× figure applies. The hybrid extension shape is honestly scoped too — it explicitly says Rust \\\"removes the Python runtime from the distribution\\\" but does *not* remove the .NET extraction half, which avoids the trap of implying an all-Rust IDE story.\\n\\n`panic = \\\"abort\\\"` is correctly demoted from doctrine to per-binary choice in both the prose and the new `[profile.release]` TOML block (the comment there — \\\"panic is per-binary, NOT set here\\\" — matches the prose exactly, no drift between the two).\\n\\nThe one place worth a second look: `salsa` still lives under \\\"Open questions,\\\" now reworded as \\\"no longer a maybe... but out of scope for the parity phase.\\\" That's a reasonable place for it (the *whether it matters* question is settled; the *how/when to wire it in* question isn't), so I wouldn't call it a contradiction — just flagging that a reader skimming only headers might still read \\\"Open questions: salsa\\\" as \\\"undecided whether it matters.\\\"\\n\\n## 3. Internal consistency\\n\\nChecked all four points plus a fifth I noticed on the way:\\n\\n- **`own-ir` relabel**: \\\"fact/verdict contract\\\" → \\\"fact contract... verdicts live in own-diagnostics\\\" is applied consistently everywhere it's referenced (crate diagram, bullet list, `own-diagnostics` bullet all agree now).\\n- **`indexing_slicing`**: pre-resolved with a scoped, justified `#[allow]` on the arena-indexed state container, deny elsewhere — matches the fitness/ratchet section's own philosophy about justified allows carrying comments.\\n- **`[profile.release]` TOML**: added, and doesn't restate `panic` (correctly deferred to the per-binary note above it) — no duplication/contradiction with the prose.\\n- **Snapshot oracle**: \\\"golden snapshots keyed by (corpus hash, Python-core commit)\\\" is stated once and referenced consistently; no leftover \\\"run Python live in CI\\\" language remains elsewhere in the oracle section.\\n- **Line-count bump** (not asked, but worth noting): the review notes said \\\"~900 lines\\\" beyond schema; the revised doc says \\\"~2 000 lines\\\" (matching the PR description). I checked `ownlang/ownir.py` — it's 2430 lines total, and the beyond-schema logic (`to_module` onward through `check_facts`/DI/effect findings) is roughly 1700–1900 lines, so \\\"~2 000\\\" is the more accurate figure, not an inconsistency — just flagging that it silently diverges from the number in the notes it cites, in case anyone cross-checks the two docs later.\\n\\nNothing else in the diff (span leaf placement, byte-offset/line-index note, `NonZeroU32` IDs, `SmallVec`/`#[cold]`/enum-size additions, error-text fixtures) contradicts another section — each maps 1:1 to a numbered finding in the review notes and is applied at every place the topic recurs in the doc.\\n\\nOverall: this is a clean, well-targeted revision. Only the two cosmetic notes above (explicit `own-bridge → own-cli` arrow, the line-count drift vs. the cited notes) are worth a follow-up tweak, and neither blocks anything.\\n\\n

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✅ Action performed

\\n\\nReview finished.\\n\\n> Note: CodeRabbit is an incremental review system and does not re-review already reviewed commits. This command is applicable only when automatic reviews are paused.\\n\\n

\",\"path\":null,\"side\":null,\"line\":null}{\"type\":\"pull_request_comment\",\"body\":\"Thanks — both cosmetic notes handled in `b3748e0`:\\n\\n- **Explicit bridge→cli edge:** the diagram now reads `{all of the above, incl. own-bridge} ─▶ own-cli`, so the one-allowed-dependent rule is visible in the picture, not just the fitness section.\\n- **Line-count drift (~900 vs ~2 000):** resolving in favor of this doc — your own measurement (`to_module` through `check_facts` ≈ 1.7–1.9k of the 2 430-line file) confirms ~2 000 is the accurate figure. `p022-review-notes.md` stays untouched as the historical review record; the commit message notes the divergence so a future cross-checker isn't puzzled.\\n\\nThe `salsa`-under-Open-questions placement stays as is per your read: *whether* is settled (Gate B), *how/when* is the genuinely open part.\\n\\n---\\n_Generated by [Claude Code](https://claude.ai/code)_\",\"path\":null,\"side\":null,\"line\":null}{\"type\":\"pull_request_comment\",\"body\":\"\\n### 💡 Codex Review\\n\\nHere are some automated review suggestions for this pull request.\\n\\n**Reviewed commit:** `59c7509d83`\\n \\n\\n

ℹ️ About Codex in GitHub

\\n
\\n\\n[Your team has set up Codex to review pull requests in this repo](https://chatgpt.com/codex/cloud/settings/general). Reviews are triggered when you\\n- Open a pull request for review\\n- Mark a draft as ready\\n- Comment \\\"@codex review\\\".\\n\\nIf Codex has suggestions, it will comment; otherwise it will react with 👍.\\n\\n\\n\\n\\nCodex can also answer questions or update the PR. Try commenting \\\"@codex address that feedback\\\".\\n \\n

\",\"path\":null,\"side\":null,\"line\":null}{\"type\":\"pull_request_comment\",\"body\":\"**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Reserve a bridge consumer for FFI**\\n\\nWith this wording, the C# editor path may use FFI, but the fitness function later says nothing except `own-cli` may depend on `own-bridge`. In the FFI scenario there must be a `cdylib`/API crate or LSP server that calls the facts→verdict bridge; otherwise the proposal only permits stdio through the CLI. Please either drop FFI here or add that API crate to the allowed-edge exception so the architecture test doesn't forbid the stated extension shape.\\n\\nUseful? React with 👍 / 👎.\",\"path\":\"docs/proposals/P-022-rust-core-migration.md\",\"side\":\"RIGHT\",\"line\":27}{\"type\":\"pull_request_comment\",\"body\":\"**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Add own-syntax to the bridge edge set**\\n\\n`own-bridge` is described as doing facts→core-AST lowering, and this document puts the AST in `own-syntax` while `own-cfg` only lowers AST→CFG. If the allowed graph omits `own-syntax`, the bridge cannot construct the AST without an undeclared dependency or a leaky re-export through `own-cfg`, so the first edge-set test will encode the wrong boundary. Add `own-syntax` to this wide consumer, or change the bridge to lower directly to CFG.\\n\\nUseful? React with 👍 / 👎.\",\"path\":\"docs/proposals/P-022-rust-core-migration.md\",\"side\":\"RIGHT\",\"line\":null}{\"type\":\"pull_request_comment\",\"body\":\"**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Remove the stale own-syntax diagnostics edge**\\n\\nThis bullet now makes `own-diagnostics` depend only on the span leaf in `own-ir`, but the topology explanation just above still says the same crate depends on `own-ir`/`own-syntax`. That leaves two conflicting allowed-edge sets for the presentation crate and could accidentally permit the parser dependency this paragraph is trying to forbid. Update the earlier prose to name only the span leaf.\\n\\nUseful? React with 👍 / 👎.\",\"path\":\"docs/proposals/P-022-rust-core-migration.md\",\"side\":\"RIGHT\",\"line\":137}{\"type\":\"pull_request_comment\",\"body\":\"**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Regenerate snapshots when corpus inputs change**\\n\\nThese snapshots are keyed by `(corpus hash, Python-core commit)`, but this sentence only allows regeneration when Python changes. When a fixture/corpus file is added or edited during the ratchet, the Python commit can be identical while the expected outputs must be regenerated for the new corpus hash; otherwise CI either diffs Rust against stale outputs or cannot cover the new input. Make the regeneration rule trigger on either key changing.\\n\\nUseful? React with 👍 / 👎.\",\"path\":\"docs/proposals/P-022-rust-core-migration.md\",\"side\":\"RIGHT\",\"line\":null}","text_elements",[],{"_388":538,"_369":370,"_390":376},{"_391":539,"_393":-5,"_42":-5,"_394":-5,"_395":-5,"_96":324,"_92":397},[540],{"_46":534,"_92":541},"input_text",{"_388":543,"_369":370,"_390":376},{"_391":544,"_393":-5,"_42":-5,"_394":-5,"_395":-5,"_96":324,"_92":397},[545,546],{"_46":548,"_92":541},{"_46":547,"_92":541},"\n /workspace/Own.NET\n bash\n 2026-07-03\n Etc/UTC\n","# AGENTS.md instructions for /workspace/Own.NET\n\n\n# AGENTS.md\n\nThis file provides guidance to agents when working with code in this repository.\n\n- Use the repository root for core commands: `python -m ownlang check|emit|cfg|report `; `emit` deliberately refuses to generate C# when any diagnostic exists.\n- Full zero-dependency regression is `python tests/run_tests.py`; single tests are standalone scripts such as `python tests/test_ownir.py`, not pytest tests.\n- `tests/run_tests.py` imports the other test files and runs the codegen fuzzer with `(iterations=3000, seed=1234)`; run `python tests/test_codegen_props.py ` when changing codegen invariants.\n- Lint gate is exactly `ruff check .` plus `mypy`; mypy is strict only for `ownlang`, while tests/fuzzers stay dynamic and are covered by ruff.\n- Ruff intentionally omits SIM because branch-collapsing fights the commented checker/control-flow structure; do not simplify those branches just for style.\n- The core pipeline is parser -> CFG resolver/lowering -> ownership/lifetime/effect/DI analyses -> diagnostics; Roslyn and OwnTS frontends emit facts only, and the Python core owns all verdicts.\n- Unknown OwnLang calls are hard errors: add local/`extern fn` signatures with ownership effects instead of letting calls tunnel through opaque host code.\n- Adding AST/CFG variants normally requires updating `assert_never` dispatch sites in `ownlang/cfg.py`, `ownlang/analysis.py`, and `ownlang/codegen.py`.\n- Codegen has two intentional modes: straight-line, laminar lifetimes get try/finally hoisting; branchy/transferring code emits releases inline. Do not add runtime “released?” flags to paper over static mistakes.\n- OwnIR schema is versioned in `ownlang/ownir.py`; additive optional fields like resource/type metadata are tolerated, incompatible vocabulary changes must fail loudly.\n- For C# repo scans, `scripts/own-check.sh` is the Action/bash surface and defaults to `--flow-locals`; on Windows use `scripts\\own-check.ps1` rather than requiring bash.\n- The Roslyn extractor auto-adds built `bin/` refs for `.csproj`/`.sln` inputs unless `--no-project-refs`; unresolved external events become advisory OWN050, not guessed leaks.\n- `audit/` must stay decoupled from `ownlang` and consumes `own-check` only through its CLI/SARIF; `audit/README.md` says active audit development currently lives in the separate OwnAudit repo.\n- Existing Cursor guidance: if CodeGraph MCP tools are available, prefer them for structural symbol/caller/impact questions; use text search for literal strings and comments.\n\n",{"_388":550,"_369":370,"_390":376},{"_391":551,"_393":-5,"_42":-5,"_394":-5,"_395":-5,"_96":552,"_92":397},[553,554],"developer",{"_46":556,"_92":541},{"_46":555,"_92":541},"\n## Skills\nA skill is a set of local instructions to follow that is stored in a `SKILL.md` file. Below is the list of skills that can be used. Each entry includes a name, description, and file path so you can open the source for full instructions when using a specific skill.\n### Available skills\n- imagegen: Generate or edit raster images when the task benefits from AI-created bitmap visuals such as photos, illustrations, textures, sprites, mockups, or transparent-background cutouts. Use when Codex should create a brand-new image, transform an existing image, or derive visual variants from references, and the output should be a bitmap asset rather than repo-native code or vector. Do not use when the task is better handled by editing existing SVG/vector/code-native assets, extending an established icon or logo system, or building the visual directly in HTML/CSS/canvas. (file: /opt/codex/skills/.system/imagegen/SKILL.md)\n- openai-docs: Use when the user asks how to build with OpenAI products or APIs and needs up-to-date official documentation with citations, help choosing the latest model for a use case, or model upgrade and prompt-upgrade guidance; prioritize OpenAI docs MCP tools, use bundled references only as helper context, and restrict any fallback browsing to official OpenAI domains. (file: /opt/codex/skills/.system/openai-docs/SKILL.md)\n- plugin-creator: Create and scaffold plugin directories for Codex with a required `.codex-plugin/plugin.json`, optional plugin folders/files, and baseline placeholders you can edit before publishing or testing. Use when Codex needs to create a new local plugin, add optional plugin structure, or generate or update repo-root `.agents/plugins/marketplace.json` entries for plugin ordering and availability metadata. (file: /opt/codex/skills/.system/plugin-creator/SKILL.md)\n- skill-creator: Guide for creating effective skills. This skill should be used when users want to create a new skill (or update an existing skill) that extends Codex's capabilities with specialized knowledge, workflows, or tool integrations. (file: /opt/codex/skills/.system/skill-creator/SKILL.md)\n- skill-installer: Install Codex skills into $CODEX_HOME/skills from a curated list or a GitHub repo path. Use when a user asks to list installable skills, install a curated skill, or install a skill from another repo (including private repos). (file: /opt/codex/skills/.system/skill-installer/SKILL.md)\n### How to use skills\n- Discovery: The list above is the skills available in this session (name + description + file path). Skill bodies live on disk at the listed paths.\n- Trigger rules: If the user names a skill (with `$SkillName` or plain text) OR the task clearly matches a skill's description shown above, you must use that skill for that turn. Multiple mentions mean use them all. Do not carry skills across turns unless re-mentioned.\n- Missing/blocked: If a named skill isn't in the list or the path can't be read, say so briefly and continue with the best fallback.\n- How to use a skill (progressive disclosure):\n 1) After deciding to use a skill, open its `SKILL.md`. Read only enough to follow the workflow.\n 2) When `SKILL.md` references relative paths (e.g., `scripts/foo.py`), resolve them relative to the skill directory listed above first, and only consider other paths if needed.\n 3) If `SKILL.md` points to extra folders such as `references/`, load only the specific files needed for the request; don't bulk-load everything.\n 4) If `scripts/` exist, prefer running or patching them instead of retyping large code blocks.\n 5) If `assets/` or templates exist, reuse them instead of recreating from scratch.\n- Coordination and sequencing:\n - If multiple skills apply, choose the minimal set that covers the request and state the order you'll use them.\n - Announce which skill(s) you're using and why (one short line). If you skip an obvious skill, say why.\n- Context hygiene:\n - Keep context small: summarize long sections instead of pasting them; only load extra files when needed.\n - Avoid deep reference-chasing: prefer opening only files directly linked from `SKILL.md` unless you're blocked.\n - When variants exist (frameworks, providers, domains), pick only the relevant reference file(s) and note that choice.\n- Safety and fallback: If a skill can't be applied cleanly (missing files, unclear instructions), state the issue, pick the next-best approach, and continue.\n","\nFilesystem sandboxing defines which files can be read or written. `sandbox_mode` is `danger-full-access`: No filesystem sandboxing - all commands are permitted. Network access is enabled.\nApproval policy is currently never. Do not provide the `sandbox_permissions` for any reason, commands will be rejected.\n","turn/started",{"_369":370,"_87":559},{"_103":-5,"_42":376,"_377":560,"_379":380,"_381":561},[],"inProgress",{"_381":563,"_369":370},{"_564":565,"_92":566},"activeFlags",[],"active","thread/started",{"_569":570},"thread",{"_571":-5,"_572":-5,"_573":574,"_575":380,"_436":437,"_576":15,"_577":-5,"_578":-5,"_579":-5,"_580":581,"_42":370,"_582":583,"_181":-5,"_584":-5,"_161":585,"_586":199,"_587":-5,"_441":588,"_381":589,"_590":-5,"_77":591,"_592":380},"agentNickname","agentRole","cliVersion","0.128.0","createdAt","ephemeral","extra","forkedFromId","gitInfo","historyMode","legacy","modelProvider","openai","parentThreadId","/opt/codex/sessions/2026/07/03/rollout-2026-07-03T19-00-26-019f295a-8742-7422-bfab-4f7c39856d6e.jsonl","preview","recencyAt","vscode",{"_92":385},"threadSource",[],"updatedAt",[],"messages",[596],{"_42":597,"_598":599,"_600":601,"_602":601,"_391":603,"_381":604,"_393":-5,"_605":32,"_606":607,"_608":609,"_610":-5},"c42044da-fe25-4086-be82-0e88cb0b5ca8","author",{"_96":324,"_181":-5,"_606":619},"create_time",1783105225.711667,"update_time",{"_615":46,"_616":617},"finished_successfully","weight","metadata",{"_611":612},"recipient","all","channel","l1239dk1",{"_613":614},"inline_comments",[],"content_type","parts",[618],"@codex all four folded in `4d5f0d7` — each was a real consistency defect:\n\n- **`own-syntax` added to the bridge edge set** (P2 @95) — correct: the lowering *constructs* core-AST nodes, so without the edge the first `cargo metadata` test would encode a boundary the bridge can't satisfy. Diagram, crate bullet, and fitness rule all updated.\n- **Stale `own-ir`/`own-syntax` in the topology prose** (P3 @136) — the earlier paragraph still permitted the parser edge the bullet forbids; it now names only the span leaf in `own-ir`.\n- **FFI vs only-`own-cli`** (P2 @27) — the fitness rule now reads \"only *entry-point* crates may depend on `own-bridge`\" (`own-cli` today; a future `own-lsp` / `own-capi` cdylib when the IDE's FFI shape lands), never a core crate — so the edge test no longer forbids the extension shape the Why states.\n- **Snapshot regeneration on either key** (P3 @459) — regeneration now triggers on a corpus/fixture change too, not only a Python-core change; steady state still runs zero Python.\n\n---\n_Generated by [Claude Code](https://claude.ai/code)_\ndocs(P-022): revise per post-merge review — own-bridge, IDE trigger, lint/perf collisions\n\n## Что и зачем\nРевизия P-022 по принятым находкам пост-мёрж ревью (`docs/notes/p022-review-notes.md`, PR #167), в порядке цены поздней находки:\n\n- **`own-bridge` — недостающий крейт (highest cost).** ~2k строк verdict-determining логики из `ownir.py` за пределами схемы (facts→core lowering `to_module`/`_lower_flow`, интерпроцедурный MOS-вывод `_build_skeletons`/`_infer_*`, BCL fresh-factory таблица, `check_facts`) не имели дома в DAG. Добавлен крейт, рёбра (`ir+cfg+analysis+diagnostics → bridge`; зависеть от него может только `own-cli`), шаг миграции 6 с пререквизитом «нормативная семантика вывода до порта» и fitness-правило.\n- **IDE-расширение как записанный Why** (Gate B из `incremental-computation.md`): перф-приоритеты — latency/incrementality, а не batch (10–100× — batch-CLI цифры); `panic=abort` — **per-binary** (LSP нужен `unwind`: salsa отменяет через unwinding); error-tolerant парсинг — требование; гибридная форма расширения (in-process Roslyn-экстракция + Rust-ядро через OwnIR-seam); salsa из «когда-нибудь» в суть Gate B.\n- **Коллизия `indexing_slicing = deny` с dense-`Vec` стейтом** — предрешена в доке: justified module-scoped `#[allow]` на arena-индексированном контейнере, deny везде ещё.\n- **Дешёвые остатки:** own-ir = *fact* contract (вердикты в own-diagnostics); span-примитивы в leaf (не `own-syntax`); byte-offsets внутри + line-index; `NonZeroU32`-IDs (niche); `[profile.release]` как TOML; оракул диффит **golden-снапшоты** (corpus hash + py commit), не живой Python на каждый CI; error-text parity fixtures; `#[cold]` на diagnostic-путях; SmallVec «measured, not sprinkled»; enum-size ритуал.\n\n## Тип изменения\n- [x] docs — документация\n- [ ] feat / fix / refactor / chore / test / ci\n\n## Как проверено\n- [x] docs-only; код и гейт не затронуты. Fence/headers целостны, sweep на противоречия (fact/verdict, panic-doctrine, span-in-syntax, Rid(u32)) чист.\n- [ ] `python tests/run_tests.py`\n- [ ] `ruff check .` и `mypy`\n\n## Связанные issue\nНет issue. Follow-up к #166 (P-022) по ревью из #167 (`p022-review-notes.md`).\n\n## Чеклист\n- [x] изменение покрыто тестом/селфтестом (или объяснено, почему нет) — docs-only\n- [x] README/docs обновлены — сам P-022; статус-строка ссылается на review-notes\n- [x] коммиты в conventional-commit стиле (`docs:`)\n\n🤖 Generated with [Claude Code](https://claude.com/claude-code)\n\n---\n_Generated by [Claude Code](https://claude.ai/code/session_01TSqD7TSzxAnGWszaFwTZVt)_\n\n\n\n## Summary by CodeRabbit\n\n* **Documentation**\n * Updated the Rust core migration proposal with clearer architecture guidance, dependency layering, and integration boundaries.\n * Expanded guidance on crate relationships, parser/error handling expectations, performance practices, and compiler/runtime settings.\n * Added more detailed CI and snapshot-based comparison workflow notes, plus stronger migration and governance requirements.\n\n\n@coderabbitai review\n@codex review\n\nThis folds the accepted findings of `docs/notes/p022-review-notes.md` back into P-022. Focus areas:\n\n1. **`own-bridge`** — is the crate boundary right? It's deliberately the one *wide* consumer (ir + cfg + analysis + diagnostics), with the inverse constraint \"nothing but `own-cli` depends on it\". Does that hold up, and is migration step 6 (with the normative-semantics prerequisite) the right place in the strangler-fig order?\n2. **IDE-trigger consequences** — per-binary `panic` (abort for CLI, unwind for LSP because salsa cancels via unwinding), error-tolerant parsing promoted to requirement, hybrid extension shape over the OwnIR seam. Anything the Why now overclaims?\n3. **Internal consistency** — after relabeling `own-ir` as the *fact* contract + span leaf, the `indexing_slicing` pre-resolution, the `[profile.release]` TOML, and the snapshot-based oracle ratchet: any place the doc still contradicts itself?\n\n---\n_Generated by [Claude Code](https://claude.ai/code)_\n\n\n\n[![Review Change Stack](https://storage.googleapis.com/coderabbit_public_assets/review-stack-in-coderabbit-ui.svg)](https://app.coderabbit.ai/change-stack/PhysShell/Own.NET/pull/168?utm_source=github_walkthrough&utm_medium=github&utm_campaign=change_stack)\n\n\n\n\n> [!WARNING]\n> ## Review limit reached\n> \n> `@PhysShell`, you've reached your PR review limit, so we couldn't start this review.\n> \n> **Next review available in:** **53 minutes**\n> \n> Enable **[usage-based reviews](https://app.coderabbit.ai/settings/billing?tab=usage&orgId=52a72632-90d1-4aad-a9c1-8632dd96c439)** in Billing to review now. 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📝 Walkthrough

\n\n## Walkthrough\n\nThis PR revises the P-022 Rust core migration proposal document, expanding sections on migration rationale, crate topology and dependency edges, ID/index design patterns, parser and library requirements, performance/panic-mode guidance, compiler strictness tooling, and the differential oracle and migration strategy for `own-bridge`. No code changes are included.\n\n### Changes\n\n**Proposal document revision**\n\n|Layer / File(s)|Summary|\n|---|---|\n|**Rationale and crate topology**
`docs/proposals/P-022-rust-core-migration.md`|Expands the IDE-trigger rationale, freezes the OwnIR seam, and clarifies crate dependency edges for `own-ir`, `own-diagnostics`, `own-codegen`, and `own-bridge`.|\n|**Patterns, libraries, and performance guidance**
`docs/proposals/P-022-rust-core-migration.md`|Adds newtype-index/`NonZeroU32` guidance, parser error-parity requirements, `SmallVec` caveats, and `panic=\"abort\"`/`panic=\"unwind\"` guidance plus a release profile snippet and clippy `#[allow]` plan.|\n|**Dependency ratchet, oracle, and migration strategy**
`docs/proposals/P-022-rust-core-migration.md`|Restricts `own-bridge` consumers, clarifies snapshot-based CI oracle diffing, details the `own-bridge` migration step, and adds salsa incrementality constraints.|\n\n**Estimated code review effort:** 2 (Simple) | ~10 minutes\n\n

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🚥 Pre-merge checks | ✅ 4

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🧩 Analysis chain

\n\n🏁 Script executed:\n\n```shell\n#!/bin/bash\nset -euo pipefail\ncd /tmp\nrm -rf repo\ngit clone --depth 50 https://github.com/PhysShell/Own.NET.git repo 2>&1 | tail -5\ncd repo\ngh pr view 168 --repo PhysShell/Own.NET --json title,body,files -q '.files[].path' 2>&1 || true\necho \"---diff stat---\"\ngh pr diff 168 --repo PhysShell/Own.NET 2>&1 | head -20\n```\n\nLength of output: 1857\n\n---\n\n🏁 Script executed:\n\n```shell\n#!/bin/bash\nset -uo pipefail\ncd /tmp/repo\necho \"=== FULL DIFF ===\"\ngh pr diff 168 --repo PhysShell/Own.NET > /tmp/pr168.diff 2>&1\nwc -l /tmp/pr168.diff\ncat /tmp/pr168.diff\necho \"=== REVIEW NOTES ===\"\nfind . -iname 'p022-review-notes.md'\ncat docs/notes/p022-review-notes.md 2>/dev/null | head -300\n```\n\nLength of output: 29557\n\n---\n\n🏁 Script executed:\n\n```shell\n#!/bin/bash\nset -uo pipefail\ncd /tmp/repo\nfd -i ownir.py\necho \"---\"\nfd -i ownir.py -x wc -l {}\necho \"--- look at schema vs beyond-schema split ---\"\nfd -i ownir.py -x grep -n \"^class\\|^def\" {} 2>/dev/null | head -80\n```\n\nLength of output: 3448\n\n---\n\n

\n\n`@PhysShell` I read the diff against `docs/notes/p022-review-notes.md` in full. Here's the review, organized by your three focus areas.\n\n## 1. `own-bridge` boundary\n\nThe boundary holds up. The diagram change is precise about direction:\n\n```\nown-ir + own-cfg + own-analysis + own-diagnostics ─▶ own-bridge\n```\n\nGiven the doc's own convention (\"Arrow = is depended on by\"), this correctly makes `own-bridge` the dependent, not a dependency of the solver — so bridge inference genuinely can't leak backward into `own-analysis`/`own-diagnostics`. The inverse constraint (\"nothing depends on `own-bridge` except `own-cli`\") is stated explicitly in the ratchet section, which is the right place to pin it (not just in prose near the crate list).\n\nMigration step 6 placement (between `own-diagnostics`/`own-codegen` at step 5 and `own-cli` at step 7) is correct strangler-fig order: bridge needs the solver and diagnostics ported first, and gating it on the normative-semantics write-up before porting is the right sequencing — that write-up is exactly the thing `test_ownir.py`-only pinning can't substitute for.\n\nOne small nit, not a defect: the crate-list line `{all of the above} ─▶ own-cli` appears directly after the `own-bridge` block, so it's implied to include it, but it's not spelled out. Given how much emphasis the doc puts on `own-bridge`'s width being deliberate, it'd read more confidently as `{all of the above, including own-bridge} ─▶ own-cli` — purely cosmetic.\n\n## 2. IDE-trigger consequences\n\nNo overclaiming found. The Why section correctly hedges the batch-vs-latency distinction (\"if today's CLI isn't CPU-bound on the corpus, the visible batch win may be modest\") rather than asserting the 10–100× figure applies. The hybrid extension shape is honestly scoped too — it explicitly says Rust \"removes the Python runtime from the distribution\" but does *not* remove the .NET extraction half, which avoids the trap of implying an all-Rust IDE story.\n\n`panic = \"abort\"` is correctly demoted from doctrine to per-binary choice in both the prose and the new `[profile.release]` TOML block (the comment there — \"panic is per-binary, NOT set here\" — matches the prose exactly, no drift between the two).\n\nThe one place worth a second look: `salsa` still lives under \"Open questions,\" now reworded as \"no longer a maybe... but out of scope for the parity phase.\" That's a reasonable place for it (the *whether it matters* question is settled; the *how/when to wire it in* question isn't), so I wouldn't call it a contradiction — just flagging that a reader skimming only headers might still read \"Open questions: salsa\" as \"undecided whether it matters.\"\n\n## 3. Internal consistency\n\nChecked all four points plus a fifth I noticed on the way:\n\n- **`own-ir` relabel**: \"fact/verdict contract\" → \"fact contract... verdicts live in own-diagnostics\" is applied consistently everywhere it's referenced (crate diagram, bullet list, `own-diagnostics` bullet all agree now).\n- **`indexing_slicing`**: pre-resolved with a scoped, justified `#[allow]` on the arena-indexed state container, deny elsewhere — matches the fitness/ratchet section's own philosophy about justified allows carrying comments.\n- **`[profile.release]` TOML**: added, and doesn't restate `panic` (correctly deferred to the per-binary note above it) — no duplication/contradiction with the prose.\n- **Snapshot oracle**: \"golden snapshots keyed by (corpus hash, Python-core commit)\" is stated once and referenced consistently; no leftover \"run Python live in CI\" language remains elsewhere in the oracle section.\n- **Line-count bump** (not asked, but worth noting): the review notes said \"~900 lines\" beyond schema; the revised doc says \"~2 000 lines\" (matching the PR description). I checked `ownlang/ownir.py` — it's 2430 lines total, and the beyond-schema logic (`to_module` onward through `check_facts`/DI/effect findings) is roughly 1700–1900 lines, so \"~2 000\" is the more accurate figure, not an inconsistency — just flagging that it silently diverges from the number in the notes it cites, in case anyone cross-checks the two docs later.\n\nNothing else in the diff (span leaf placement, byte-offset/line-index note, `NonZeroU32` IDs, `SmallVec`/`#[cold]`/enum-size additions, error-text fixtures) contradicts another section — each maps 1:1 to a numbered finding in the review notes and is applied at every place the topic recurs in the doc.\n\nOverall: this is a clean, well-targeted revision. Only the two cosmetic notes above (explicit `own-bridge → own-cli` arrow, the line-count drift vs. the cited notes) are worth a follow-up tweak, and neither blocks anything.\n\n

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\nThanks — both cosmetic notes handled in `b3748e0`:\n\n- **Explicit bridge→cli edge:** the diagram now reads `{all of the above, incl. own-bridge} ─▶ own-cli`, so the one-allowed-dependent rule is visible in the picture, not just the fitness section.\n- **Line-count drift (~900 vs ~2 000):** resolving in favor of this doc — your own measurement (`to_module` through `check_facts` ≈ 1.7–1.9k of the 2 430-line file) confirms ~2 000 is the accurate figure. `p022-review-notes.md` stays untouched as the historical review record; the commit message notes the divergence so a future cross-checker isn't puzzled.\n\nThe `salsa`-under-Open-questions placement stays as is per your read: *whether* is settled (Gate B), *how/when* is the genuinely open part.\n\n---\n_Generated by [Claude Code](https://claude.ai/code)_\n\n### 💡 Codex Review\n\nHere are some automated review suggestions for this pull request.\n\n**Reviewed commit:** `59c7509d83`\n \n\n

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\n**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Reserve a bridge consumer for FFI**\n\nWith this wording, the C# editor path may use FFI, but the fitness function later says nothing except `own-cli` may depend on `own-bridge`. In the FFI scenario there must be a `cdylib`/API crate or LSP server that calls the facts→verdict bridge; otherwise the proposal only permits stdio through the CLI. Please either drop FFI here or add that API crate to the allowed-edge exception so the architecture test doesn't forbid the stated extension shape.\n\nUseful? React with 👍 / 👎.\n**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Add own-syntax to the bridge edge set**\n\n`own-bridge` is described as doing facts→core-AST lowering, and this document puts the AST in `own-syntax` while `own-cfg` only lowers AST→CFG. If the allowed graph omits `own-syntax`, the bridge cannot construct the AST without an undeclared dependency or a leaky re-export through `own-cfg`, so the first edge-set test will encode the wrong boundary. Add `own-syntax` to this wide consumer, or change the bridge to lower directly to CFG.\n\nUseful? React with 👍 / 👎.\n**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Remove the stale own-syntax diagnostics edge**\n\nThis bullet now makes `own-diagnostics` depend only on the span leaf in `own-ir`, but the topology explanation just above still says the same crate depends on `own-ir`/`own-syntax`. That leaves two conflicting allowed-edge sets for the presentation crate and could accidentally permit the parser dependency this paragraph is trying to forbid. Update the earlier prose to name only the span leaf.\n\nUseful? React with 👍 / 👎.\n**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Regenerate snapshots when corpus inputs change**\n\nThese snapshots are keyed by `(corpus hash, Python-core commit)`, but this sentence only allows regeneration when Python changes. When a fixture/corpus file is added or edited during the ratchet, the Python commit can be identical while the expected outputs must be regenerated for the new corpus hash; otherwise CI either diffs Rust against stale outputs or cannot cover the new input. Make the regeneration rule trigger on either key changing.\n\nUseful? React with 👍 / 👎.",{},"created",1783105264.6355627,"Completing the task","event_type","info",{"_92":397,"_96":93,"_391":1121},{"_92":627,"_628":629},"partial_repo_snapshot","files",[630],{"_161":631,"_632":-5,"_633":634,"_635":-5},"docs/proposals/P-022-rust-core-migration.md","contents","line_range_contents",[636],"missing_reason",{"_637":329,"_638":639,"_391":640,"_641":59},"line_range_start","line_range_end",546,[642,199,643,644,645,646,199,647,199,648,649,650,651,652,653,654,655,656,657,658,199,659,660,661,662,663,664,665,199,666,667,668,669,670,671,672,199,673,674,675,676,677,199,678,199,679,680,681,682,683,684,685,686,199,687,688,689,690,691,692,693,694,199,695,199,696,697,199,698,699,700,701,702,703,704,705,706,199,707,199,708,199,709,710,711,712,713,714,715,199,716,717,718,199,719,720,721,722,199,723,724,725,199,726,727,728,729,730,731,732,733,734,735,736,737,738,199,739,740,741,742,743,744,745,746,747,748,749,750,751,752,753,754,755,756,757,758,759,760,761,762,763,764,765,766,767,768,769,770,771,772,773,774,775,199,776,777,778,199,779,199,780,781,782,783,784,785,786,787,788,789,199,790,791,792,199,793,199,794,781,795,796,797,798,799,800,801,802,803,804,805,806,807,808,809,810,811,199,812,199,813,814,815,816,817,199,818,819,820,821,822,823,824,825,826,827,828,829,830,831,832,833,834,835,836,837,838,839,840,841,842,843,844,845,846,847,848,849,850,851,199,852,853,854,855,856,857,858,859,860,199,861,862,863,864,865,866,867,868,869,870,871,872,873,874,875,876,877,878,879,880,881,882,883,884,885,886,887,888,199,889,890,891,892,199,893,894,895,896,199,897,898,899,900,901,902,903,904,905,906,199,907,908,909,910,199,911,199,912,913,199,914,915,916,917,918,919,920,921,922,923,924,925,926,927,928,929,930,931,932,933,934,935,936,199,937,938,939,940,941,199,942,199,943,199,944,945,946,947,948,949,199,950,951,952,953,954,955,956,957,958,959,725,199,960,199,944,961,962,963,964,965,966,725,199,967,968,969,970,971,199,972,973,974,975,976,977,978,979,980,199,981,199,982,983,984,985,986,987,988,989,990,991,199,992,993,994,995,996,997,998,999,1000,1001,1002,1003,1004,1005,1006,199,1007,199,1008,199,1009,1010,1011,199,1012,1013,1014,1015,1016,1017,1018,1019,1020,1021,1022,1023,1024,1025,1026,1027,1028,1029,1030,1031,1032,1033,1034,1035,1036,1037,1038,1039,1040,1041,1042,1043,1044,1045,1046,1047,1048,1049,1050,1051,1052,1053,1054,1055,1056,1057,1058,1059,1060,199,1061,1062,1063,1064,1065,1066,1067,199,1068,1069,199,1070,199,1071,1072,1073,1074,1075,1076,1077,1078,1079,1080,1081,1082,1083,1084,1085,1086,1087,1088,1089,199,1090,199,1091,199,1092,1093,1094,1095,1096,1097,1098,1099,1100,1101,1102,1103,1104,1105,1106,1107,1108,1109,1110,1111,1112,1113,1114,1115,1116,199,1117,199,1118,1119,1120],"contains_end_of_file","# P-022 — Rust core migration: bird's-eye architecture","Status: **draft / exploratory** (design only — no Rust code committed yet; the","Python core stays the reference implementation and the oracle until parity holds).","Revised per the post-merge review in","[`docs/notes/p022-review-notes.md`](../notes/p022-review-notes.md).","## Why","The primary trigger is the **IDE extension** — Gate B of","[`incremental-computation.md`](../notes/incremental-computation.md), a *recorded*","trigger under the house discipline (`AGENTS.execution-surfaces.md` §7–8: profiler","numbers or real pain, not \"would be nice\"). An IDE analyzes broken code on every","keystroke and cares about **latency and incrementality**, not batch throughput —","which is exactly where Rust + `salsa` beats \"fast Python\" *by construction*, and","where the familiar 10–100× figures (ruff's) don't even apply: those are batch-CLI","numbers, and if today's CLI isn't CPU-bound on the corpus, the visible batch win may","be modest. Set public expectations on the IDE latency budget, not the batch","multiplier. A Rust core also removes the Python runtime from the distribution","(alpha-readiness gap A).","The **realistic extension shape is hybrid**: for the flagship path (real C# in the","editor) the latency chain is keystroke → Roslyn semantic model (in-process in the","IDE, already incremental) → fact extraction → core verdicts. The Rust core is the","*cheap* half of that chain; extraction stays in-process on the .NET side regardless.","So the VS/VS Code extension hosts the existing C# extractor and talks to the Rust","core over the **OwnIR seam** (stdio or FFI) — the very seam this proposal freezes.","For `.own` files a pure-Rust LSP is trivial and a good first slice.","Secondary motivation: the Python core (`ownlang/`) is a working PoC, but its density","is a maintenance tax — a mutable-dict dataflow state keyed by `id(sym)`, an","`assert_never` dispatch hand-updated across three files, analyses (ownership /","lifetime / effect / DI) interleaved in one `_Analyzer`. This document is the","bird's-eye plan: crate topology, patterns, libraries, prior art,","architecture-fitness tooling, and — the load-bearing piece — a **differential","oracle** that pins the Rust core to the Python one output-for-output.","The recent evidence + SARIF work (P-015, execution-surfaces ADR) is not incidental","here: it turned the core's verdicts into **normalized, diffable contracts**","(sorted diagnostics, SARIF `codeFlows`/`relatedLocations`, `.ownreport.json`). Those","contracts are exactly what a differential oracle compares. The migration rides on","them.","## Goals / non-goals","**Goals**","- A Rust workspace whose **crate graph is the architecture** — an enforced acyclic"," dependency DAG, high cohesion per crate, decoupled across the OwnIR seam.","- **Behavioural parity** with the Python core on the existing corpus, proven by a"," differential oracle in CI (the Python repo is the golden test).","- Idiomatic Rust that removes the Python accidental complexity (enums + exhaustive"," `match` instead of `assert_never`; newtype IDs instead of `id(sym)`; persistent"," state instead of deep `copy()`).","**Non-goals (for this phase)**","- No Datalog/Ascent rewrite of the rule layer yet. That is a *later* strategy the"," Rust move unlocks (execution-surfaces ADR §8 trigger), not part of the port.","- No reimplementation of the frontends. The Roslyn (C#) extractor and OwnTS (TS)"," stay put — they emit **OwnIR** facts; the Rust core consumes OwnIR exactly as the"," Python core does. OwnIR is the seam, not a thing to rewrite.","- No behaviour changes. If the Rust core disagrees with Python, Python wins until a"," divergence is a deliberate, separately-justified change.","## The seam: what stays a contract","Three contracts must not drift during the port — they are the oracle's comparison","surface and the frontend boundary:","1. **OwnIR** (`ownlang/ownir.py`): the versioned JSON fact schema frontends emit and"," the core consumes. Rust re-types it with `serde`; the JSON on the wire is"," identical. Additive optional fields tolerated, vocabulary changes fail loudly —"," same rule as today.","2. **Diagnostic + Evidence** (`ownlang/diagnostics.py`): code, line, subject,"," resource_kind, and the ordered evidence slice. This is the verdict contract.","3. **Output surfaces**: text (`render`/`render_pretty`), SARIF 2.1.0"," (`relatedLocations`/`codeFlows`), `.ownreport.json`, and emitted C# (`emit`)."," Normalized, these are byte-comparable across implementations.","## Crate topology (decoupled = the DAG; Cargo enforces acyclicity at compile time)","Arrow = \"is depended on by\" (dependency → dependent, i.e. build order):","```text"," own-ir (OwnIR *fact* contract + span/location primitives; serde — leaf,"," everyone may depend on it; verdicts live in own-diagnostics)"," own-syntax (lexer / parser / AST)"," └─▶ own-cfg (AST → CFG lowering)"," ├─▶ own-analysis (lattice + worklist; ownership / lifetime / effect / DI)"," └─▶ own-codegen (C# emit — AST/CFG only; NOT own-analysis, NOT own-diagnostics)"," own-diagnostics (Diagnostic/Evidence model, text + SARIF) ─▶ own-analysis"," # own-analysis *constructs* Diagnostic/Evidence, so it depends on own-diagnostics;"," # own-diagnostics depends only on the span/location leaf — never on the solver."," own-ir + own-syntax + own-cfg + own-analysis + own-diagnostics ─▶ own-bridge"," # facts → core lowering + interprocedural MOS inference + verdict mapping"," # (today's ownir.py beyond the schema; the flagship C#→facts→verdicts path;"," # own-syntax is required — the lowering *constructs* core AST nodes)"," {all of the above, incl. own-bridge} ─▶ own-cli (check / emit / cfg / report / ownir / explain)"," own-cli ◀─ own-oracle (dev/test: differential harness vs Python)","```","The non-obvious edge is **`own-analysis → own-diagnostics`**: the solver *constructs*","`Diagnostic`/`Evidence` values (in Python, `analysis.py` imports and builds them from","`diagnostics.py` using solver-internal state), and those types are *owned by*","`own-diagnostics` — so analysis depends on diagnostics, **not the reverse**.","`own-diagnostics` therefore stays upstream, depending only on the span/location leaf","in `own-ir` (**not** `own-syntax` — the presentation crate must not drag in the","parser), never on the solver — which is exactly the fitness function below. `own-codegen` is the true **sibling**: it hangs off `own-cfg`/AST *only* and is","**verdict-independent** (Python `codegen.generate(mod)` takes just the AST — its policy","comes from `_laminar_scopes`/`_buffer_modes`, not analysis conclusions). Codegen must","not chain through diagnostics or reach into the solver; if Rust codegen ever *does* want","a verdict (e.g. a `Dispose()` inserted from the ownership conclusion rather than","re-derived from shape), that is a **deliberate new `own-codegen → own-analysis` edge**","to flag on its own.","- **`own-syntax`** — lexer + parser + AST. Zero analysis knowledge. (Prior art:"," ruff / rust-analyzer parsers.)","- **`own-ir`** — OwnIR **fact** types, `serde` (de)serialization, schema version —"," plus the **span/location primitives** (`Span`, file/offset types), so the"," presentation layer never has to pull the parser to name a source position. Shared"," by the (future) frontends-in-Rust and the core; kept dependency-light so both"," sides can depend on it without pulling the analysis. (If span types ever feel out"," of place here, split a tiny `own-span` leaf — the invariant is only that they live"," in a *leaf*, not in `own-syntax`.)","- **`own-cfg`** — AST → CFG lowering; CFG/Instr types. The `assert_never` sites"," become exhaustive `match` here.","- **`own-analysis`** — the heart: a generic worklist solver over `Lattice` +"," `Analysis` traits, and the ownership/loan/lifetime/effect/DI impls. Each analysis"," is an independent trait impl, not interleaved (this is the direct de-noodling of"," today's `_Analyzer`).","- **`own-diagnostics`** — *owns* the Diagnostic/Evidence types + their presentation"," (human render, SARIF projection). It knows nothing about the solver; the solver"," depends on **it** to construct verdicts. Depends only on the span/location leaf"," (`own-ir`) — **not** on `own-syntax`, or the presentation crate drags in the"," parser. Mirrors today's clean split (`evidence.py` is a pure projection).","- **`own-codegen`** — C# emission, **driven by AST/CFG shape, not analysis verdicts**"," (verdict-independent, matching Python `codegen.generate(mod)`). Depends on `own-cfg`"," only — a sibling of `own-analysis`/`own-diagnostics`, downstream of neither.","- **`own-bridge`** — the OwnIR **bridge**: everything in today's `ownir.py` *beyond*"," the schema (~2 000 lines of verdict-determining logic that previously had no named"," home in this DAG): facts → core-AST lowering (`to_module`/`_lower_flow`, handle"," minting, localmap kill-on-rebind), the interprocedural **MOS** inference"," (`_build_skeletons`, `_infer_return_skeleton`, `_infer_param_effect`, the BCL"," fresh-factory table), branch-local hoisting, and `check_facts`' fact→verdict"," mapping. Consumes `own-ir` facts, **constructs `own-syntax` AST nodes** (the"," lowering's output), drives the `own-cfg`/`own-analysis` pipeline, constructs"," `own-diagnostics` findings. This is the flagship path (real C# → facts"," → verdicts); **porting it is a named migration step**, and its inference semantics"," get a normative write-up *before* the port (today they are pinned only by"," `test_ownir.py` examples — see the tech-debt register, \"OwnIR: formalize\").","- **`own-cli`** — the binary; wires the pipeline and owns the CLI surface.","- **`own-oracle`** — dev-only differential harness (see below).","The dependency arrows only point rightward/inward; Cargo makes a cycle a compile","error, so the layering is not a convention you can accidentally violate — it is the","build graph.","## Patterns / idioms (what removes the Python accidental complexity)","| Python pain today | Rust idiom | Payoff |","| --- | --- | --- |","| `assert_never` dispatch updated by hand in cfg/analysis/codegen | `enum` + exhaustive `match` | a missed variant is a **compile error**, not a runtime assert |","| RID = `id(sym)`; handles keyed by object identity | newtype indices `Rid(NonZeroU32)`, `BlockId(NonZeroU32)`, … + arena | deterministic, serializable, no identity hacks; `NonZeroU32` makes `Option` the same size as `Id` (niche optimization) — a day-1 decision, painful to retrofit |","| line/col threaded through everything | **byte offsets** internally + one line-index per file; line/col computed only at the output seam (ruff / rust-analyzer convention) | positions stay `u32`-cheap and edit-stable; rendering pays the conversion once |","| AST/CFG as object graphs | **arena + indices** (`la-arena`/`id-arena`) | borrow-checker-friendly graphs, cheap clone, cache-friendly |","| `State.copy()` deep-copies dicts every merge | dense bitset `Vec` + arena/scratch copy-on-write *(leaning default)*; persistent maps (`imbl`/`rpds`) a *benchmark candidate* | avoid the deep copy at merges — but don't pre-commit to tree-node alloc + O(log n); see the persistent-vs-arena open question |","| ownership/lifetime/effect/DI interleaved in `_Analyzer` | `Lattice` + `DataflowAnalysis` traits; one generic solver, N impls | analyses decoupled + independently testable |","| strings compared everywhere | interning (`lasso`/`string-interner`) | cheap symbol equality; smaller state |","| Diagnostics-as-data (good, keep it) | keep: `Diagnostic` is data, **not** an `Err` | verdicts stay first-class; `thiserror`/`anyhow` only for real I/O errors |","Direction of the analysis (forward worklist to fixpoint, union at merge, monotone","transfer over a finite lattice) ports directly — it is textbook `rustc_mir_dataflow`","shape.","## Libraries (candidates — pin/validate maintenance at build time)","| Concern | Candidate(s) | Notes |","| Lexer | `logos` | derive-based, fast; or hand-roll to match Python tokens exactly |","| Parser | hand-written recursive descent (recommended) | golden parity of error messages **and** error-tolerant parsing — a *requirement* under the IDE trigger (broken code on every keystroke; rust-analyzer precedent), not a nice-to-have |","| Arena / IDs | `la-arena` (rust-analyzer), `id-arena`, `slotmap` | index-based AST/CFG |","| Interning | `lasso`, `string-interner` | symbol/string interning |","| Graph (CFG) | `petgraph` or hand-rolled arena | petgraph gives traversals/dominators for free |","| Dataflow state | dense bitset `Vec` + arena/scratch CoW *(leaning default)*; `imbl`/`rpds` *(benchmark candidate)* | persistent maps are one option to bench, **not** the default idiom — see the persistent-vs-arena open question |","| Serialization | `serde` + `serde_json` | OwnIR, SARIF, `.ownreport.json` |","| SARIF types | `serde-sarif` (evaluate) or hand-rolled structs | we already emit the shape; typed structs prevent drift |","| CLI | `clap` (derive) | mirror the current subcommand surface |","| Errors | `thiserror` (libs) + `anyhow` (bin) | diagnostics are NOT errors |","| Snapshot tests | `insta` | the Rust equivalent of the golden tests |","| Property tests | `proptest` | replaces the Python codegen fuzzer |","| Datalog (later) | `ascent`, `datafrog`, `crepe` | only if/when the rule layer goes declarative |","| Fast hashing | `rustc-hash` (`FxHashMap`) / `ahash` | keys are small ints (RID/BlockId); SipHash default is a tax |","| Parallelism | `rayon` | per-function analysis is embarrassingly parallel |","| Allocator | `mimalloc` / `jemalloc` (`#[global_allocator]`) | allocation-heavy frontend; often a free 10–20 % |","| Perf regression gate | `iai-callgrind` (CI) + `criterion` (local) + `dhat` (heap) | instruction-count benches are deterministic → CI-safe |","## Performance principles (\"blazingly fast\" is earned, not free)","\"Written in Rust\" makes speed *possible*, not automatic — needless `.clone()`, the","SipHash default, `Box` in loops, and per-node allocation write slow Rust just","fine. This is a compiler frontend: the cost is **allocation, hashing, and tree/graph","traversal**, not FLOPs, so the levers are specific. In rough order of payoff for our","workload:","1. **Intern everything** (symbols/strings → `u32`). `lasso`/`string-interner`;"," equality becomes an int compare, memory drops sharply. rustc/rust-analyzer intern"," universally — the #1 lever for this kind of code.","2. **Bitset lattice, not `HashSet`.** Today's `set[VarState]` over"," `{OWNED,MOVED,RELEASED,ESCAPED}` becomes a **`u8` via `bitflags`**, and `State.var`"," a *dense* `Vec` indexed by RID — tiny, cache-friendly, trivially cloned."," (rustc's dataflow uses `BitSet`/`ChunkedBitSet`.) This is also the thumb on the"," scale for the persistent-map-vs-arena question: with a bitset + dense `Vec`, the"," arena+CoW representation almost certainly wins.","3. **Arena-allocate the immutable trees.** An AST/CFG is built once then read many"," times — the textbook case for a **bump/typed arena** (`bumpalo`, `typed-arena`, or"," rustc's own `TypedArena`): nodes land contiguously, there is no per-node `Box`, and"," the whole tree frees at once. Combine with `u32` indices for cross-references (half"," the size of a 64-bit pointer, no pointer chasing, and serializable) — `la-arena` /"," `id-arena` give exactly that.","4. **Flat backing arrays, never `Vec>`.** Nested vecs scatter each inner vec"," across the heap (a cache miss per row). Back per-block instruction lists, the loan"," table, etc. with one flat `Vec` + offsets/slices. This is the same cache argument as"," the dense-`Vec`-by-RID state above.","5. **`SmallVec` for the many-small collections — measured, not sprinkled.** Evidence"," steps (usually 1–2) and loans per owner (usually 0–1) match the small-N profile;"," `SmallVec<[Evidence; 2]>` keeps them inline (no allocation, same cache locality as"," a plain `T`) and only spills in the rare large case. Per-block *instruction lists*"," may **not** match the profile — measure before converting; an oversized inline"," capacity bloats every instance.","6. **`FxHashMap` everywhere** (`rustc-hash`) — our keys are small ints; SipHash is pure"," overhead here.","7. **Prefer enums / `impl Trait` / `&dyn` over `Box`.** The `Lattice`/`Analysis`"," layer is better as enums or generics (monomorphized, inlinable) than boxed trait"," objects; where dynamic dispatch is genuinely needed, `&dyn` beats an owning `Box`.","8. **`rayon` across functions** — each function's worklist is independent, so per-"," function (and per-file over OwnIR dumps) analysis parallelizes trivially.","9. **`mimalloc`/`jemalloc`** as the global allocator — a common free win for an"," allocation-heavy frontend.","**Solver scheduling (a big lever the compact lattice alone won't buy).** For a monotone","forward analysis with loops, *block visitation order* decides how many times joins and","transfers re-run. Schedule the worklist in **reverse-postorder (RPO)** so a block is","(re)visited after its predecessors are stable — this minimizes fixpoint iterations. Back","the queue with a cheap **`in_queue` bitset** (or, for small CFGs, a dense bitset-of-","blocks) so a block is never enqueued twice, and reuse **scratch state buffers** across","per-block transfers instead of re-allocating a fresh `State` each visit. Without this,","an implementation can burn most of its time revisiting blocks and churning allocations","*even with* the bitset lattice above.","**Discipline (the article's framing, which we already run as doctrine):** don't","optimize blindly or first — readability first, then optimize by **cumulative cost**","under `perf`/a flamegraph, not by what \"looks slow\"; truly one-time costs don't matter,","the hot path (the transfer function in the worklist) does — so **keep the transfer","pure** (local writes, no writes through shared pointers) both to help the optimizer keep","values in registers and to make it trivially benchmarkable. **Caveat for the batch","scanner:** over large OwnIR dumps, `serde_json` parse and SARIF/report rendering are","`O(input + findings)` and run on *every* invocation — once the transfer loop is tight,","that I/O can dominate wall-time and allocations. So bench it explicitly too:","representative large-OwnIR `from_slice` / buffered `to_writer`, with borrowed/interned","diagnostic strings — not only transfer-function microbenches. Algorithms before","micro-opt. `#[inline]` only on tiny cross-crate hot functions (`next`/`deref`","shape), **never `#[inline(always)]` by reflex**; `#[cold]` on the","diagnostic-construction paths is a good, *stable*-Rust hint (`likely`/`unlikely` are","not stable); LTO for cross-crate inlining. **`panic = \"abort\"` is a per-binary","choice, not doctrine:** fine for `own-cli`; **fatal for a long-lived LSP server**,","where one panic in one file's analysis kills the whole session — and `salsa`","implements *cancellation via unwinding*, so an LSP binary needs `panic = \"unwind\"` +","a catch at the request boundary (rust-analyzer's model). Record it per profile now so","\"abort in release\" doesn't get baked into the workspace. Bounds-check elision the","**safe** way — consolidate the","checks into one early `assert!` and let LLVM prove the rest unreachable (Rust's safe","iterators already match the C start/end-pointer idiom) — plus SIMD are the *last*","resort, behind a flamegraph. Note this stays inside `unsafe_code = \"forbid\"`: we do","**not** reach for `unsafe get_unchecked`. If a *profiled* hot path ever proves it needs","raw unchecked indexing beyond what assert-elision buys, that single crate — not the","workspace — drops `forbid` → `deny` with a documented, reviewed `#[allow(unsafe_code)]`;","never a blanket relaxation.","**Correctness first:** the differential oracle proves parity with Python before any of","this; perf is then locked by an **`iai-callgrind` instruction-count ratchet** in CI","(deterministic, unlike wall-clock), so a regression fails the build the same way a","divergence does.","*Further reading:* troubles.md \"Writing words and reading dwords: Achieving warp speed","with Rust\" (the source of the arena/`SmallVec`/cache points above), BurntSushi's ripgrep","post-mortem, and Alexandrescu's \"Fastware\" talk.","## Prior art to study (architecture references)","| Project | What to steal |","| --- | --- |","| **rust-analyzer** | arena + interning, hand-written error-recovering parser, `salsa` incremental, crate split |","| **ruff** (Astral) | Python-linter-in-Rust: AST visitor, **rule registry**, diagnostics + fixes, `insta` snapshots, workspace layout — the closest analogue to what we're building |","| **rustc `rustc_mir_dataflow`** | the `Analysis`/lattice/worklist framework — our ownership dataflow is the same shape |","| **clippy lint-pass registry** | a *second-party* lint layer bolted onto a compiler's MIR — arguably a closer analogue to our OWN-code registry (analyses atop external-frontend OwnIR facts) than ruff's own |","| **Polonius** | borrow-check-as-Datalog (uses `datafrog`) — the reference if we later take facts/relations → Datalog |","| **Prusti / Flux / Creusot / MIRAI** | pass architecture for Rust static verification; **prusti-viper**'s MIR→Viper *encoding boundary* is a model for seaming a future verification backend (P-002) onto `own-ir` without touching `own-analysis` |","| **oxc / biome** | JS/TS toolchains in Rust: crate splitting, diagnostics, codegen, perf |","| **salsa** | incremental recomputation, if we want editor/on-save later |","The **ruff / clippy rule registries** are worth calling out: they are the","execution-surfaces ADR §2 \"typed primitive/detector registry\" done idiomatically in","Rust — so that ADR idea is better realized *after* the port, natively, than bolted","onto Python now.","## Architecture-fitness tooling for Rust (the \"architectural analyzers\")","There is no single \"ArchUnit for Rust\", but the crate DAG plus a few tools give","strong, CI-enforceable decoupling:","- **The crate graph itself** — cyclic crate deps are a Cargo compile error, so the"," layering is enforced for free. Add a tiny test that parses `cargo metadata` and"," asserts the *allowed* edge set (a poor-man's ArchUnit — fails if, say,"," `own-diagnostics` ever grows a dep on `own-analysis`).","- **`cargo-modules`** — visualize/asserts module + crate structure and dependencies;"," catches orphans and unexpected edges.","- **`cargo-deny`** — dependency policy (licenses, bans, duplicate versions,"," advisories) — supply-chain + hygiene gate.","- **`cargo-machete`** (stable) / **`cargo-udeps`** (nightly) — unused dependency"," detector; machete is CI-cheap, udeps catches a few more.","- **`cargo-semver-checks`** — public-API break detection, for the library-shaped"," crates (`own-ir`, and anything consumed externally).","- **`cargo-hack --feature-powerset`** — build/test every feature combination, so a"," combo nobody compiled doesn't rot.","- **`cargo-public-api`** — track each crate's public surface so coupling can't leak"," in through accidentally-`pub` internals; diff it in CI.","- **`cargo-mutants`** — mutation testing: does the test suite (and the oracle) *catch*"," a deliberately broken transfer/lattice, or is it green-but-blind? The sharpest tool"," here, and a natural fit with a correctness-first, oracle-gated port.","- **Enum-size ritual** — `clippy::large_enum_variant` already warns by default; the"," missing piece is the habit: a test asserting `size_of::()` / `size_of::()`"," so any IR-type change that balloons the hot enums fails loudly instead of silently"," doubling every arena.","Honest limit: there is **no full NDepend/ArchUnit-for-Rust** (no LCOM /","instability-metric / \"zone of pain\" tooling). The language compensates partly (orphan","rules, default privacy, `unreachable_pub`), and the crate DAG + `cargo-modules` +","`cargo metadata` edge tests cover the structural invariants — but true cohesion/SRP","judgement stays a review concern (human or the CodeRabbit/Codex layer we already run).","### Compiler strictness — declarative `[workspace.lints]` (Rust ≥ 1.74)","Lint config lives once in the workspace `Cargo.toml` and every crate inherits it:","```toml","[workspace.lints.rust]","unsafe_code = \"forbid\" # forbid where unsafe isn't needed — cannot be overridden","unreachable_pub = \"deny\" # a pub nobody sees is a lie in the API","missing_debug_implementations = \"warn\"","rust_2018_idioms = { level = \"deny\", priority = -1 }","[workspace.lints.clippy]","pedantic = { level = \"warn\", priority = -1 }","nursery = { level = \"warn\", priority = -1 }","unwrap_used = \"deny\" # restriction group, applied surgically:","expect_used = \"warn\"","indexing_slicing = \"deny\" # a panicking `[i]` is a prod incident","arithmetic_side_effects = \"deny\" # silent release-mode overflow","panic = \"deny\"","dbg_macro = \"deny\"","print_stdout = \"deny\" # libraries speak via `tracing`, not stdout","And the release profile, as TOML rather than prose:","[profile.release]","lto = \"thin\"","codegen-units = 1","opt-level = 3","# panic is per-binary, NOT set here: \"abort\" for own-cli,","# \"unwind\" for any LSP binary (salsa cancels via unwinding) — see Performance.","Do **not** take `pedantic`/`nursery` wholesale to `deny` — they carry noisy lints;","keep them `warn` with surgical `#[allow(...)]`, and **every `#[allow]` carries a","justification comment** (an unexplained allow is debt). `unsafe_code = \"forbid\"` per","crate is stronger than `deny` (it cannot be locally overridden) — set it everywhere a","crate has no legitimate `unsafe`.","**Pre-resolved collision — `indexing_slicing = \"deny\"` vs the dense-`Vec` state.**","The perf doctrine's centerpiece is `Vec` indexed by RID (and flat backing","arrays everywhere); denying `v[i]` there, with `unwrap_used` also denied and","`.get().expect(...)` too noisy for the hot path, would train exactly the","suppress-without-looking reflex the ratchet warns against. Resolution, decided here","rather than in the first PR's review thread: **arena/newtype-index access is","panic-free by construction** (`la-arena`-style `arena[idx]` where the ID was minted","by that arena), so the state container carries a *justified, module-scoped*","`#[allow(clippy::indexing_slicing)]`; the deny stays in force everywhere else.","### The ratchet (do not boil the ocean)","Max strictness switched on all at once, even on a *new* codebase, trains the","suppress-without-looking reflex — and a linter you reflexively silence is dead. This","is the same **ratchet** we already run for correctness (the oracle) and perf","(`iai-callgrind`): **baseline the current violations, hold new code to the full bar,","and let old code only get better, never worse.** Tighten half a turn per iteration, do","not strip the thread in one evening. This also honours the project's prime directive —","*a false positive is worse than a miss* — at the tooling layer, not just in the","analyzer's own verdicts. The same doctrine across all three stacks (Rust / .NET /","Python) and the cross-stack tools (CodeQL, Semgrep) lives in","[`docs/notes/strictness-and-fitness.md`](../notes/strictness-and-fitness.md).","Fitness functions to encode early, each locked by one `cargo metadata` test over the","allowed edge set:","- **`own-diagnostics` and `own-ir` must not depend on `own-analysis`** — the"," verdict/contract layer stays independent of the solver.","- **`own-codegen` must not depend on `own-diagnostics`** (they are siblings), and —"," for now — not on `own-analysis` either (codegen is verdict-independent). A future"," `own-codegen → own-analysis` edge is allowed only as a deliberate, reviewed change"," to the allowed set, never implicitly.","- **`own-bridge` is the one deliberately wide consumer** (ir + syntax + cfg +"," analysis + diagnostics) — that width is its job. The constraint runs the other way:"," **only *entry-point* crates may depend on `own-bridge`** — `own-cli` today, plus a"," future `own-lsp` server and/or `own-capi` (`cdylib`) when the IDE's FFI shape lands"," (the Why explicitly allows stdio *or* FFI, so the edge test must not forbid the"," stated extension shape). Never a core crate — bridge inference can never leak into"," the solver or the verdict layer.","## The differential oracle (Python repo = golden test)","This is the spine of the migration — it lets us port incrementally with confidence.","**Principle:** compare on the **stable output contracts**, never on internal state.","Both implementations already sort diagnostics by `(line, code)`; both emit the same","SARIF/JSON shapes. So:","- **Inputs:** the existing `corpus/`, `examples/`, `tests/fixtures/`, golden `.own`"," files, and OwnIR fact files. Plus generated inputs (see below).","- **Run both:** `python -m ownlang check --format sarif ` vs"," `own-rs check --format sarif ` (identical CLI surface + SARIF ⇒ clean diff)."," Likewise `report` (`.ownreport.json`) and `emit` (C#).","- **Exit/crash gate first.** Before diffing *any* output, assert both binaries"," produced the same exit status and neither panicked — a Rust panic has no SARIF"," representation, so an output-only diff would score a crash-on-valid-input as"," \"no findings = parity\". Diff `stderr` too — but note it carries only the"," machine-format *summary/chatter* (verbosity lines). The advisory **OWN050** is a"," genuine **SARIF result** (`level: \"note\"`; pinned in `tests/test_ownir.py`), so it is"," compared on the SARIF seam like any other finding — do **not** treat it as"," stderr-only, or the oracle will diff the wrong stream / double-count the human"," summary text.","- **Exact, not fuzzy.** This is a **golden** same-input comparison, so it demands"," strict set-equality on `(path, line, code, subject)` plus the full evidence slice"," **including each step's label text** (a step on the right line with the wrong"," `role`/label is a real semantic bug SARIF-location-diffing alone misses). Also pin"," intra-tie ordering when two findings share `(line, code)`."," > **Do not reuse `scripts/oracle_compare.py` as the parity oracle.** It was built"," > for a *different* job — cross-tool fuzzy matching against external tools (Infer#/"," > CodeQL): it keeps only leak-class findings, matches by basename within a ±N-line"," > tolerance (`near()`), and buckets severities coarsely. Reused as-is it would let"," > an off-by-one in Rust CFG lowering, a changed evidence label, a wrong"," > subject/resource-kind, a non-leak diagnostic, or a differing exit status all pass"," > as \"parity\". Build a **new exact diff harness** (or add a strict `--exact` mode to"," > the script) over canonicalized `status + stdout + stderr + SARIF/JSON`. Reuse"," > `oracle_compare.py` only as a reference for the SARIF-reading plumbing.","- **Normalize then diff:** canonicalize JSON (sorted keys), normalize file paths,"," drop only genuinely volatile fields (timestamps, absolute temp dirs) — nothing"," semantic. \"SARIF-clean\" must not be allowed to imply \"full parity\": `.ownreport.json`"," fields not modeled in SARIF are compared on their own seam.","- **CI ratchet — against snapshots, not a live Python run.** Don't execute the Python"," core on every CI pass: commit its outputs as **golden snapshots keyed by"," (corpus hash, Python-core commit)** and diff Rust against the snapshots; regenerate"," when **either key changes** — a Python-core change *or* a corpus/fixture"," addition/edit (a new input under an unchanged Python commit still needs fresh"," expected outputs, or CI diffs Rust against stale ones / silently skips the new"," input). Both are the exception, not the rule; the steady state runs zero Python."," Otherwise CI time grows with corpus × Python and the ratchet gets disabled"," \"temporarily\" — the death of every ratchet. Coverage starts small and grows; the"," gate only tightens.","- **Error-text parity is fixture-backed.** Parser/diagnostic message texts live in"," shared fixtures asserted from *both* implementations; otherwise \"identical error"," messages\" rests on copy-paste and drifts silently.","- **Generative differential + metamorphic:** reuse the codegen fuzzer's spirit —"," generate random `.own`/OwnIR, run both, diff. Metamorphic relations (e.g. renaming"," a symbol must not change the diagnostic set) catch classes of bugs a fixed corpus"," misses.","**Per-layer seams.** SARIF is the verdict-layer seam and already exists. A **CFG-layer","seam does not** — today `python -m ownlang cfg` prints a *human* dump (`_print_cfg`),","not a contract. So a prerequisite of diffing CFGs is to first **add and freeze a","canonical `cfg --format json` export on the Python side**; mirroring the debug text","dump would bake a non-contract format into the ratchet. Treat \"CFG JSON seam\" as work","to build, not an existing contract. With SARIF (verdict) present and CFG-JSON added,","a divergence can be bisected to the crate that introduced it.","Because the oracle compares *contracts we froze and tested*, the recent evidence/SARIF","hardening is what makes the verdict seam cheap — the CFG seam still needs building.","## Migration strategy (strangler-fig, bottom-up, oracle-gated)","0. **Add the missing Python seams first**: a canonical `cfg --format json` export"," (and the exact diff harness). Without these the ratchet has nothing to compare the"," CFG layer against.","1. **Stand up the workspace + `own-ir`** (serde round-trips the existing OwnIR"," fixtures — first parity check, at the seam).","2. **`own-syntax`**: port the parser; diff the AST/`cfg` dump against Python.","3. **`own-cfg`**: port lowering; diff the frozen CFG JSON (from step 0).","4. **`own-analysis`**: port the worklist + ownership first, then lifetime/effect/DI;"," diff diagnostics (no evidence) → then evidence → then SARIF, layer by layer.","5. **`own-diagnostics` + `own-codegen`**: SARIF/report/text and C# `emit`; diff each.","6. **`own-bridge`**: port the OwnIR bridge — facts→core lowering, the MOS"," interprocedural inference, verdict mapping. **Prerequisite:** the normative"," write-up of the inference semantics (consume/borrow/fresh/alias/overwrite rules)"," from the tech-debt register, so the port has a spec and not just"," `test_ownir.py` examples. Diff on the OwnIR fixtures + `ownir --format sarif`.","7. **`own-cli`**: cut over once corpus parity is ~100%. Keep Python frozen as the"," oracle/spec.","8. **Only then** revisit the rule layer as Datalog/Ascent (ADR §8: \"core moves to"," Rust\" trigger now satisfied) — natively, not as a Python detour.","Throughout, Python stays authoritative; the Rust crates light up behind the ratchet.","## Open questions (to resolve as we go)","- **Parser**: hand-roll vs `chumsky`/`winnow`. Leaning hand-roll for golden-parity of"," error messages — matching Python's exact wording/positions through a combinator's"," error model is friction in an oracle context. Re-evaluate a combinator rewrite only"," *after* error-parity is frozen, gated by the same oracle.","- **Persistent vs arena-CoW state**: `imbl`/`rpds` maps vs a dense arena + dirty-bitset"," copy-on-write. Persistent maps win with frequent merges / high sharing (wide CFGs);"," arena+CoW likely wins on *this* workload (procedural functions, modest branching,"," small per-RID state) where flat-`Vec` access beats persistent-map lookup constants —"," and `imbl` only pulls ahead if we graduate to interprocedural/whole-program dataflow."," Bench on the corpus's **largest real function** (not synthetic), measuring both"," wall-clock **and** peak RSS (persistent maps often lose on RSS via node overhead even"," when they win on clone time).","- **`serde-sarif` vs hand-rolled SARIF structs**: evaluate the crate's maintenance and"," whether it matches our exact shape.","- **Incrementality (`salsa`)**: out of scope for the *parity phase*, but no longer a"," maybe — it is the substance of the IDE trigger (Gate B), so the crate split must"," not preclude it: keep queries pure, keep `panic = \"unwind\"` viable for the LSP"," binary (salsa cancellation unwinds), and prefer data models salsa can key"," (interned IDs, byte offsets).","- **Repo layout**: a `rust/` subtree in this repo (monorepo, easiest for the oracle to"," run both) vs a sibling repo. Monorepo recommended *for this phase* so the oracle and"," corpus are one `git` away and there is no submodule/pinned-SHA ceremony. Revisit the"," split once Rust is authoritative and Python is legacy/reference-only — at that point"," the coupling inverts and the monorepo's blast radius (Rust CI on every Python-only"," doc change) becomes the annoyance rather than the benefit.","## Placement","This document lives in `PhysShell/Own.NET/docs/proposals/`. It is design-only; the","first code deliverable is the workspace skeleton + `own-ir` round-trip + the oracle","harness, on its own branch, gated by the differential ratchet from commit one.",[1122,1123,1124,1125,1126,1127,1128,1129,1130],{"_615":46,"_46":1144},{"_615":1132,"_161":631,"_637":1142,"_638":1143},{"_615":46,"_46":1141},{"_615":1132,"_161":631,"_637":1139,"_638":1140},{"_615":46,"_46":1138},{"_615":1132,"_161":631,"_637":1136,"_638":1137},{"_615":46,"_46":1135},{"_615":1132,"_161":631,"_637":1133,"_638":1134},{"_615":46,"_46":1131},"\n\n**Testing**\n* ✅ `git status --short`\n* ✅ `git log --oneline -5`\n* ✅ `rg -n \"own-ir \\\\+ own-syntax|entry-point|either key changes|own-diagnostics.*own-syntax|own-bridge|corpus/fixture|stdio or FFI|own-capi|own-lsp\" docs/proposals/P-022-rust-core-migration.md`\n* ✅ `nl -ba docs/proposals/P-022-rust-core-migration.md | sed -n '88,106p;128,148p;408,420p;456,468p'`\n\nNo commit or PR was created because the requested fixes were already present and the working tree had no changes.","repo_file_citation",461,467,"\n* Snapshot regeneration now triggers when either key changes: Python-core commit or corpus/fixture hash. ",413,419,"\n* The fitness rule now allows only entry-point crates to depend on `own-bridge`, including future `own-lsp` / `own-capi` entry points for the IDE FFI shape, while forbidding core-crate dependency leakage. ",133,137,"\n* The diagnostics topology now says `own-diagnostics` depends only on the span/location leaf in `own-ir`, explicitly not `own-syntax`. ",95,98,"### Summary\n\n* Verified the four Codex review findings are already addressed in the current PR head `4d5f0d7`; I did **not** make any additional code or documentation changes.\n* The `own-bridge` dependency edge now includes `own-syntax`, with an explicit note that bridge lowering constructs core AST nodes. ",{"_92":324,"_42":84,"_96":324,"_1147":1148,"_1149":1150,"_1151":1152,"_132":-5,"_119":1153},[83],"input_items",[1172,1173,1174,1175,1176,1177,1178,1179,1180,1181,1182],"external_post_config",{"_1154":1155,"_262":196,"_1156":304,"_273":-5,"_1157":256,"_1158":-5,"_1159":-5,"_1160":1161,"_1162":1163,"_1164":-5,"_1165":-5,"_1166":1167,"_1168":15,"_1169":59,"_1170":54,"_1171":15},"user_model_slug","slug",1783105218.310791,"installation_id",131220309,"pr_number","repo_id","gitlab_service_account_project_id","review_trigger","comment_id",4878790444,"comment_type","issue","pr_write_guard_token","pending_pr_reaction_id","pending_comment_reaction_id",378238319,"comment_if_no_findings","comment_on_error","share_url","is_parallel_review",{"_92":397,"_96":324,"_391":1200},{"_311":312,"_313":314,"_1197":318,"_1198":129,"_320":-5,"_92":1199},{"_92":1183,"_313":1196,"_161":-5,"_1185":-5,"_1187":-5},{"_92":1183,"_313":1195,"_161":-5,"_1185":-5,"_1187":-5},{"_92":1183,"_313":1194,"_161":-5,"_1185":-5,"_1187":-5},{"_92":1183,"_313":1193,"_161":-5,"_1185":-5,"_1187":-5},{"_92":1183,"_313":1192,"_161":-5,"_1185":-5,"_1187":-5},{"_92":1183,"_313":1190,"_161":631,"_1185":1186,"_1187":1191},{"_92":1183,"_313":1189,"_161":631,"_1185":1186,"_1187":-5},{"_92":1183,"_313":1188,"_161":631,"_1185":1186,"_1187":1140},{"_92":1183,"_313":1184,"_161":631,"_1185":1186,"_1187":-5},"pull_request_comment","**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Regenerate snapshots when corpus inputs change**\n\nThese snapshots are keyed by `(corpus hash, Python-core commit)`, but this sentence only allows regeneration when Python changes. When a fixture/corpus file is added or edited during the ratchet, the Python commit can be identical while the expected outputs must be regenerated for the new corpus hash; otherwise CI either diffs Rust against stale outputs or cannot cover the new input. Make the regeneration rule trigger on either key changing.\n\nUseful? React with 👍 / 👎.","side","RIGHT","line","**_{_{![P3 Badge](https://img.shields.io/badge/P3-lightgrey?style=flat)}} Remove the stale own-syntax diagnostics edge**\n\nThis bullet now makes `own-diagnostics` depend only on the span leaf in `own-ir`, but the topology explanation just above still says the same crate depends on `own-ir`/`own-syntax`. That leaves two conflicting allowed-edge sets for the presentation crate and could accidentally permit the parser dependency this paragraph is trying to forbid. Update the earlier prose to name only the span leaf.\n\nUseful? React with 👍 / 👎.","**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Add own-syntax to the bridge edge set**\n\n`own-bridge` is described as doing facts→core-AST lowering, and this document puts the AST in `own-syntax` while `own-cfg` only lowers AST→CFG. If the allowed graph omits `own-syntax`, the bridge cannot construct the AST without an undeclared dependency or a leaky re-export through `own-cfg`, so the first edge-set test will encode the wrong boundary. Add `own-syntax` to this wide consumer, or change the bridge to lower directly to CFG.\n\nUseful? React with 👍 / 👎.","**_{_{![P2 Badge](https://img.shields.io/badge/P2-yellow?style=flat)}} Reserve a bridge consumer for FFI**\n\nWith this wording, the C# editor path may use FFI, but the fitness function later says nothing except `own-cli` may depend on `own-bridge`. In the FFI scenario there must be a `cdylib`/API crate or LSP server that calls the facts→verdict bridge; otherwise the proposal only permits stdio through the CLI. Please either drop FFI here or add that API crate to the allowed-edge exception so the architecture test doesn't forbid the stated extension shape.\n\nUseful? React with 👍 / 👎.",27,"\n### 💡 Codex Review\n\nHere are some automated review suggestions for this pull request.\n\n**Reviewed commit:** `59c7509d83`\n \n\n

ℹ️ About Codex in GitHub

","Thanks — both cosmetic notes handled in `b3748e0`:\n\n- **Explicit bridge→cli edge:** the diagram now reads `{all of the above, incl. own-bridge} ─▶ own-cli`, so the one-allowed-dependent rule is visible in the picture, not just the fitness section.\n- **Line-count drift (~900 vs ~2 000):** resolving in favor of this doc — your own measurement (`to_module` through `check_facts` ≈ 1.7–1.9k of the 2 430-line file) confirms ~2 000 is the accurate figure. `p022-review-notes.md` stays untouched as the historical review record; the commit message notes the divergence so a future cross-checker isn't puzzled.\n\nThe `salsa`-under-Open-questions placement stays as is per your read: *whether* is settled (Gate B), *how/when* is the genuinely open part.\n\n---\n_Generated by [Claude Code](https://claude.ai/code)_","\n\n

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\n\n\n_{Comment `@coderabbitai help` to get the list of available commands.}\n\n","@coderabbitai review\n@codex review\n\nThis folds the accepted findings of `docs/notes/p022-review-notes.md` back into P-022. Focus areas:\n\n1. **`own-bridge`** — is the crate boundary right? It's deliberately the one *wide* consumer (ir + cfg + analysis + diagnostics), with the inverse constraint \"nothing but `own-cli` depends on it\". Does that hold up, and is migration step 6 (with the normative-semantics prerequisite) the right place in the strangler-fig order?\n2. **IDE-trigger consequences** — per-binary `panic` (abort for CLI, unwind for LSP because salsa cancels via unwinding), error-tolerant parsing promoted to requirement, hybrid extension shape over the OwnIR seam. Anything the Why now overclaims?\n3. **Internal consistency** — after relabeling `own-ir` as the *fact* contract + span leaf, the `indexing_slicing` pre-resolution, the `[profile.release]` TOML, and the snapshot-based oracle ratchet: any place the doc still contradicts itself?\n\n---\n_Generated by [Claude Code](https://claude.ai/code)_","base_ref","head_ref","pull_request_info",[1201],{"_615":46,"_46":1202},"@codex all four folded in `4d5f0d7` — each was a real consistency defect:\n\n- **`own-syntax` added to the bridge edge set** (P2 @95) — correct: the lowering *constructs* core-AST nodes, so without the edge the first `cargo metadata` test would encode a boundary the bridge can't satisfy. Diagram, crate bullet, and fitness rule all updated.\n- **Stale `own-ir`/`own-syntax` in the topology prose** (P3 @136) — the earlier paragraph still permitted the parser edge the bullet forbids; it now names only the span leaf in `own-ir`.\n- **FFI vs only-`own-cli`** (P2 @27) — the fitness rule now reads \"only *entry-point* crates may depend on `own-bridge`\" (`own-cli` today; a future `own-lsp` / `own-capi` cdylib when the IDE's FFI shape lands), never a core crate — so the edge test no longer forbids the extension shape the Why states.\n- **Snapshot regeneration on either key** (P3 @459) — regeneration now triggers on a corpus/fixture change too, not only a Python-core change; steady state still runs zero Python.\n\n---\n_Generated by [Claude 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