SWG-INF-06: level-2 resource budget and the frozen Law A baseline - #195
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Two witnesses, one of which cannot compile yet.
The Law A baseline is the live replacement for INF-06's stale differential.
The entry asked for the pre-refactor parser to be diffed against the
refactored one; INF-03 landed and deleted that parser, and its own
acceptance already discharged the comparison. But spec §5.5 states a
differential with a live right-hand side the moment level dispatch exists:
a build supporting `1..=N` must treat every `swang 1` source — including
invalid ones — exactly as a level-1-only build did, on verdict, AST,
canonical bytes, diagnostic code, message, span, and order.
Today N is 1, so that comparison has nothing to compare against, and by the
time 4A-06 supplies one the level-1-only build will be gone exactly as the
pre-refactor parser is gone now. So the left-hand side is recorded here,
while a level-1-only build is what the tree holds. The artifact names the
commit that produced it and is compare-only: there is deliberately no
"update the snapshot" path.
The AST observation is a test-owned projection, not `Debug`, not serde, and
emphatically not the formatter's output — canonical bytes and the AST have
to be two witnesses, not one wearing two hats, or a coordinated
parser+formatter regression would preserve the bytes while changing what the
tree means. Every struct is destructured with no `..` and every enum matched
with no wildcard, so a new field or variant breaks this file at compile
time. Eighteen mutation witnesses prove each leaf with a second inhabitant
actually moves the observation; `level` and `ExportFormat` have exactly one
inhabitant each and are named as such rather than quietly skipped.
The corpus is deliberate, not a fuzz museum: 23 fixed sources reaching both
verdicts, every level-1 enum variant, both states of every optional, and all
fourteen level-1 diagnostic codes. The checked-in `swang_parse` seed is
included as an input subset rather than described from memory.
The budget contract is the actual red: `crate::syntax::limits` does not
exist, so the lib test fails with E0432. It states §5.11's counting
semantics before there is an implementation to agree with — that the gate is
a live counter admitting each thing *before* it is built, since checking
`tokens.len()` after lexing four million tokens is an obituary, not a gate.
The fuzz oracle's registry check moves from `starts_with("SWG")`, which
accepted `SWG`, `SWGxyz`, and `SWG12345`, to the one shape the registry has.
No regex dependency is needed to say so.
No production file is touched, so the baseline cannot have been produced by
anything this task later changes.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
`swang/src/syntax/limits.rs` declares the four bounds spec §5.11 allocates
to level 2 and ships the budget that will enforce them:
MAX_SOURCE_BYTES 16_777_216 exactly 16 MiB
MAX_TOKENS 4_000_000
MAX_NESTING_DEPTH 64
MAX_DIAGNOSTICS 256
A live counter, not an audit. Every axis is admitted before the thing it
counts is built — source before lexing, each token before the lexer stores
it, each block on entry, each diagnostic before it is appended. Checking
`tokens.len()` after lexing four million tokens is not a resource gate; it
is an obituary written after the allocation.
Two decisions the tests pin rather than leave to a reader. A refused token
is not counted, so the budget records what it granted and never what it
turned away. And the diagnostic cap reserves its last slot for the terminal
refusal, because §5.11 caps what one attempt *returns* and the `SWG0509`
counts toward that total — a cap of two buys one ordinary diagnostic and the
breach that ends the run, not two and a third that quietly exceeds it.
One code for four axes. They mean the same thing — a declared level-2 budget
was crossed — and §5.10 forbids one number carrying two meanings, so
inventing four codes would reserve three numbers for distinctions nobody has
yet needed. The message names the axis, the declared limit, and what the
parse would have needed.
Depth and diagnostics are forward reservations and say so in the module
docs. The exact-score grammar has no recursive production — score, track,
voice, group, note, position, evidence bottoms out — so it cannot approach
64, and today's parser maps each error into a one-element vector, so it
cannot approach 256. Both are declared anyway: §5.11 requires declaration
before level 2's first accepted program, and a bound not declared now can
never be added, because adding it later would narrow a frozen acceptance
set. Declaring them costs nothing; not declaring them spends the option
permanently.
No live caller, on purpose. Level 2 is unreachable on this build, so wiring
a gate into a parser that does not exist would be the fake half of the work.
`#[allow(dead_code)]` carries that reason, as `ast/v2.rs` does for the same
situation. SWG-4A-06 owes the wiring.
Two boundary witnesses guard the one rule that cannot be allowed to rot:
level 1 must never consult this. One reads the six level-1 modules through
`include_str!`; the other walks every shipped `.rs` under `swang/src` at
runtime, because a hardcoded file list decays into a list of the files
someone remembered. Both were proven to fail on a planted, compiling
reference from `parser/v1.rs` before being trusted — an earlier probe that
merely failed to compile proved nothing and was redone.
The Law A baseline recorded in the previous commit still matches byte for
byte, which is the point of having recorded it: adding this module moved no
level-1 verdict, AST, canonical byte, or diagnostic.
The red tests are unchanged in substance; four `assert!(_.is_ok())` forms
became `expect`/`expect_err` to satisfy `assertions_on_result_states`.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
…ation found A probe corrupting `SWG0403` at one production site **survived** the corpus as first written, and it should not have. The corpus reached every level-1 diagnostic *code*, and that turns out to be a much weaker claim than it reads as: `SWG0403` is raised from four different places, `SWG0401` from twenty-two. Reaching one site proves nothing about the others, and the coverage test's name implied a completeness it did not have. The gap was the usual shape — a check too narrow for the data it runs over, counting codes where the failures live at sites. So the corpus grows from 23 cases to 50, reaching 38 distinct `(code, message)` refusals where it previously reached 14: the lexer's three own refusals, the block's structure, the pipeline's shape and order, and every scalar spelling. `the_corpus_pins_the_extent_of_its_own_sample` now records that number, so a corpus that shrinks fails instead of just testing less. It does not pretend a finite corpus is Law A's whole domain — it states its own extent, which is the honest thing a sample can do. The regenerated baseline was produced in a detached worktree at c44313c, not here, so the recorded observations still come from a level-1-only build that has never seen this task's production code. That is belt and braces: `git diff c44313c HEAD` over the level-1 path — header, lexer, parser, formatter, level-1 AST — is empty, which is itself the claim the baseline exists to keep true. Falsification after the change: 10 probes, 0 survivors. The off-by-one at each of the four caps, a token counted despite being refused, a no-op depth counter, a diagnostic cap returning one item too many, two malformed registry codes, a reworded frozen message, and a formatter spacing change are all caught by a named test. P8 is recorded as SURVIVED before this commit and CAUGHT after, rather than as though the first corpus had caught it. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
…s them Spec §5.11 gains the four numbers, what each counts, and what happens when one is crossed. The counting semantics are part of the declaration, not commentary. Without them `64` and `4_000_000` are decorative numerology — a token budget that counts differently is a different budget — so §5.11 now says that source bytes are UTF-8 bytes of the complete source with the header, that end of input is not a token, that depth counts simultaneously open structural braces with the `score` root at 1 and scalar lists at none, and that the diagnostic cap covers what one attempt returns including the terminal refusal. Depth and diagnostics are labelled **forward reservations** in the spec itself, because a limit presented as a defence against a danger that does not exist is how a number stops being questioned. The exact-score grammar has no recursive production and the parser returns one diagnostic; neither 64 nor 256 can currently be approached. They are declared because §5.11 offers no second chance: a bound not declared before level 2's first accepted program can never be added. `SWG0509` joins the level-2 registry in `exact-score-text.md` — one code for four axes, recorded there as earned by the resource gate rather than by the grammar, with the "no block is reserved beyond these four" sentence updated to five rather than left quietly wrong. Precedence and breach locations are pinned in §5.11 so a budget refusal cannot be mistaken for a grammar error, including the rule that a source with nine hundred braces need not become a depth error if the grammar rejects it first: the resource checker must not understand more grammar than the parser does. The backlog entry is rewritten rather than ticked. Three claims in it were stale or not this task's, and each is now recorded as such: the pre-refactor differential (discharged by INF-03, which deleted the parser it named), the end-to-end limit-breach fuzz oracle (it would cover a path the binary cannot enter), and "a canonical formatter that only ever writes from a checked AST" (the writer lane is complete and 4A-09 owns checked lowering; a resource-gate change has no business becoming another formatter-validation layer). SWG-4A-06 inherits two acceptance bullets instead of a note someone has to remember: level-2 dispatch must construct and consult the budget before its first successful `swang 2` result, with the checks in the right places, and `swang_parse` gains the breach oracle once a fuzzed input can reach a level-2 parser. Level 2 is not accepted and not frozen. Phase 4A stays open. `LANGUAGE_LEVEL` is still 1. Local verification: 1462 tests green across core, swang, pattern, cli, and ui-core; `cargo fmt --all --check`, `cargo clippy --workspace --all-targets -- -D warnings`, and `cargo check --workspace --all-targets` all clean. `cargo test --workspace` still cannot link here because `rust-lld` cannot find `-lasound`, identically at the base commit; CI is the acceptance source for the full run and the fuzz matrix. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
… a convention Review found that the baseline records three sources that are not Law A cases at all, and one of them is actively harmful. §5.5 scopes Law A to "every source whose first line is a valid `swang 1` header — whether its body is valid or not". The valid header is the premise. Only the body varies. `rejected_header_corpus()` put three sources into the artifact that the frozen pre-parser refuses before a body is ever read: a `swang 2` header, a malformed `swang1`, and a byte-order mark. The `swang 2` case is the one that matters. Its recorded refusal is `SWG0001`, and SWG-4A-06 exists precisely to make `swang 2` supported — after which that source must pass header dispatch and be refused as a level-2 `pattern` root instead. A baseline built to protect 4A-06 would have declared 4A-06's entire purpose a regression, and the failure would have looked like the safety net working. This commit adds only the witness, which fails on all three. The corpus fix and the regenerated golden follow, so the record shows the artifact was wrong before it shows it corrected. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
…ot, a sealed budget Four review findings, each with a probe that survived before the fix. **The corpus leaves Law A's domain.** The three header cases are gone. §5.5 scopes Law A to sources whose first line is already a valid `swang 1` header, and the pre-parser's own codes are raised *instead of* admitting such a source, so `SWG0001`, `SWG0002`, and `SWG0003` are unreachable inside the domain and leave `LEVEL_ONE_CODES` — eleven parser codes remain. All three keep their characterization tests beside the frozen pre-parser, where the contract that governs them lives, so nothing is lost but a false claim. The golden was regenerated in a detached `c44313c` worktree: 47 cases, 35 distinct refusals, counted from the artifact rather than assumed. **The boundary witness was blind exactly where dispatch will land.** `syntax.rs` was exempt wholesale, which looked harmless while it held one `mod limits;` line — and it is also the crate's re-export point and the natural home for 4A-06's shared dispatch. A budget consulted there, before the level 1/2 branch, is a level-1 bound whatever file it lives in, and both witnesses would have said nothing. `syntax.rs` is now scanned like any other module with only its bare declaration permitted by exact line, and it joins the explicit level-1 path list. Level-2-specific modules go on the exempt list one at a time when 4A-06 creates them; shared dispatch never does. Probe: `const _PROBE: bool = limits::MAX_TOKENS > 0;` in `syntax.rs`, compiling. SURVIVED at b76aacc, CAUGHT here by both witnesses. **The mechanism let a future caller opt out of the normative limits.** `Level2ResourceLimits` had `pub(crate)` fields, so any production module could have built `{ tokens: u64::MAX, .. }` and satisfied every word of the contract while meaning none of it. Fields are private now, `declared()` is the only production constructor, and the scaled constructor tests use is `#[cfg(test)]` and so cannot appear in a shipped call site. `Level2Budget` also loses `Clone`: the doc comment already explained why duplicating a running counter lets a caller spend the same budget twice, and the derive contradicted it. Cheapest possible time to close both doors is while there is no caller. **The breach contract was implemented better than it was proven.** One table-driven witness now covers all four axes on all five properties — code, axis phrase, declared limit, needed count, and the caller's span — replacing three narrower tests that between them checked the message on one axis, the span on another, and the code on three. It also pins the diagnostics axis's unusual-but-correct arithmetic: at a cap of two, a second ordinary diagnostic plus the terminal refusal would need three slots, which is what `needed` reports. Falsification, 15 probes, 0 survivors. The five that are new all survived the pre-review suite: an axis reporting another axis's word, a depth breach pointing somewhere fixed, a diagnostic breach understating what it needed, a production back door to arbitrary limits, and the `syntax.rs` mention above. The back door is now CAUGHT-BY-COMPILE rather than by a test, which is the stronger outcome. `limits.rs` also carries the corrected freeze rationale; the spec, backlog, and decision-log wording follow in the closure commit. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
…ed accounting **The freeze rationale was wrong, the deadline was not.** §5.11 said a bound added after level 2's first accepted program "would narrow an acceptance set that is by then frozen". §5.3 says a level freezes on acceptance of the phase that delivers it, so level 2 stays provisional until Phase 4A is accepted and would still be unfrozen at 4A-06. The deadline is §5.11's own admission rule and is **stricter than the freeze boundary**: it holds because programs are by then already written against a provisional level, not because the level is closed. The rule stands unchanged; the reason given for it is corrected in the spec, the backlog, and the decision log, and was corrected in `limits.rs` with the sealing commit. A rule kept for a reason that does not survive inspection is a rule someone will eventually discard along with the reason. **Corrected accounting.** The backlog entry now reports 47 cases and 35 distinct refusals over the eleven codes reachable inside Law A's domain, not 50 and 38 over fourteen, and records why the three header cases left: §5.5 scopes Law A to sources whose first line is a valid `swang 1` header, and `swang 2` in particular was an artifact that would have failed on exactly the behaviour 4A-06 must deliver. The falsification count is 15, with six probes recorded as SURVIVED-then-CAUGHT across two review commits. **A scheduler debt written down before it evaporates.** SWG-INF-05 gains two inherited bullets. It is the first task that can approach the diagnostic bound, so it consults `admit_diagnostic`; its own cap of 32 may be stricter than 256 but never larger. More importantly, its existing acceptance bullet — "the first diagnostic of every existing single-error golden is unchanged" — is not sufficient once Law A is stated. §5.10 freezes level 1's diagnostic *order* and the baseline records the whole sequence, so a level-1 parse that starts returning three diagnostics where it returned one has changed a frozen level's released output with its first diagnostic untouched. INF-05 must say whether recovery is level-2-only or how it stays inside §5.10, before writing code against a bullet that Law A has since outgrown. Level 2 is not accepted and not frozen. Phase 4A stays open. `LANGUAGE_LEVEL` is still 1. Local verification: 1461 tests green across core, swang, pattern, cli, and ui-core; `cargo fmt --all --check` and `cargo clippy --workspace --all-targets -- -D warnings` both clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Included review availability: Your plan provides up to 1 included review per hour; 0 remain after this review. 📝 WalkthroughWalkthroughThe change defines level-2 parser resource limits, implements the budget mechanism, adds focused tests, freezes a level-1 Law A baseline, and tightens diagnostic-code validation. ChangesLevel-2 parser foundation
Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🔵 Low · up to The PR stages a future level-2 resource budget without enabling level-2 parsing. A boundary test can miss indirect budget calls, weakening protection against accidental level-1 coupling; this is a bounded, non-runtime risk that should receive owner follow-up before or alongside merge. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
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CodeRabbit's merge-risk note on #195, verified: once the diagnostic budget goes terminal, its accounting keeps running. Against a cap of two, `diagnostics()` reaches 3 on the first repeat and 7 after five more calls, and the message's `needed` count grows with it — inventing an ever-larger hypothetical parse for a parse that was already terminated. Every call still returns `Err`, so a caller obeying the contract never exceeds the declared maximum. That makes the defect latent, not correct: a type that calls itself a running resource state has to report one, and `diagnostics()` stops meaning anything the moment the budget is spent. `admit_token` already pins the matching law — a refused token does not advance admitted state. The diagnostic axis needs it too, with the one difference that its terminal refusal genuinely consumes the final slot, once. So the law is saturation, not refusal-without-effect: cap = 2 first ordinary diagnostic -> Ok, diagnostics = 1 next admission -> Err, diagnostics = 2, needed = 3 every later admission -> Err, diagnostics = 2, needed = 3 This commit is the witness only, and it fails on e212668 at the first repeat. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
The last slot is consumed once. Every later admission is refused identically, and neither the counter nor the reported `needed` count moves. `needed` is now derived from the cap rather than from the running counter, which is what it always meant: the number of slots a parse would have required to keep this diagnostic *and* still carry the terminal refusal. That is one past the cap however many times an ignored `Err` is retried — it does not grow, because the parse it describes has already been terminated. This gives the diagnostic axis the law `admit_token` already had — a refused thing does not advance admitted state — with the single documented difference that the terminal refusal itself genuinely occupies a slot. Mutation, on the pre-fix head e212668: incrementing past the cap on a repeated breach SURVIVED. It is CAUGHT here by `diagnostic_exhaustion_is_terminal_and_stops_accounting`. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
**The token bound keeps its number and gains a storage contract.** Codex
found that `MAX_TOKENS = 4_000_000` rested on an unstated assumption about
what a retained token costs. Every premise checks out: `griff-swang` is a
direct dependency of the Cockpit, CI builds that for
`wasm32-unknown-unknown`, and level 1's `Token` owns a `String` each — the
lexer allocates one even for a single `{` — measuring 40 bytes on a 64-bit
host, so four million would pass 150 MiB of vector spine before millions of
individual string allocations. §5.11 promises a typed refusal rather than an
allocation death; on a browser tab that promise would have failed.
The recorded derivation was "≈ 4 bytes per token at the byte cap". That ties
`MAX_TOKENS` to `MAX_SOURCE_BYTES` consistently, but it never asks what a
retained token costs, and AGENTS.md requires the derivation be recorded.
Lowering the bound would spend permanent acceptance-set budget to
accommodate a representation level 2 has not been written to inherit. The
level-2 lexer does not exist yet and 4A-06 already owes the first live
wiring, so §5.11 now carries the heap derivation and states the requirement
as a budget rather than a struct layout: no per-token owned lexeme storage,
at most 12 bytes retained per token on `wasm32`, text recovered from the
span — or a strictly stronger representation such as streaming. A lexer is
left free to do better and forbidden only from doing worse. If 4A-06's
measured behaviour disproves the derivation, that is the moment to lower the
bound, still inside §5.11's deadline.
4A-06 gains a third inherited bullet requiring it to prove that on the
`wasm32` frontend, with a witness rather than prose — a compile-time size
assertion plus tests showing text is source-sliced — and a preregistered
probe: adding owned lexeme text to the level-2 token must be CAUGHT.
Falsification is now 16 probes, 0 survivors, with seven recorded
SURVIVED-then-CAUGHT. The new one is CodeRabbit's: accounting that runs on
past a terminal diagnostic breach SURVIVED at e212668 and is caught by the
witness two commits back.
Both findings are recorded in the decision log as continuations naming the
reviewer that produced them, because a derivation nobody wrote down is a
number that stops being questioned.
Level 2 is not accepted and not frozen. Phase 4A stays open.
`LANGUAGE_LEVEL` is still 1.
Local verification: 1462 tests green across core, swang, pattern, cli, and
ui-core; `cargo fmt --all --check` and `cargo clippy --workspace
--all-targets -- -D warnings` both clean.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Actionable comments posted: 1
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Inline comments:
In `@docs/swang/foundation-backlog.md`:
- Around line 470-471: Align the Law A scope wording in “The domain is a
witness” with the contracts at Lines 209-214 and 455-459: restrict the
valid-header requirement only to the baseline corpus, or revise the earlier
contract so all `swang 1` sources, including invalid-header inputs, remain
covered consistently.
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…alid bodies CodeRabbit found a real conflict and prescribed the wrong cure. Both are worth recording. The conflict: three passages said Law A covers "every `swang 1` source — including invalid ones", while the section beneath them correctly scoped it to sources with a valid `swang 1` header. Read loosely, the first phrasing sweeps in `swang1`, a byte-order mark, and `swang 2`, none of which §5.5 reaches. The prescription was to "state that only the baseline corpus is restricted, or update the earlier Law A contract" so invalid-header inputs stay covered. Both directions contradict the spec. §5.5 is normative and unambiguous: "For **every** source whose first line is a valid `swang 1` header — whether its body is valid or not". The restriction is on Law A itself, not merely on this task's corpus. Following either remedy would have made `swang 2` → `SWG0001` a Law A obligation, which is exactly the trap the domain witness exists to prevent, since SWG-4A-06 must break it. So the loose prose is corrected upward to §5.5's precision rather than the accurate paragraph being dragged down: - the INF-02 summary's Law A bullet; - the INF-06 entry's live-differential paragraph; - the INF-06 decision-log entry, where the same false breadth had already reached the durable record — closing it in the backlog while leaving it beside would be documentation eventual consistency; - `law_a_baseline.rs`'s module doc, which contradicted the domain witness 690 lines below it in the same file. Leaving that one would have reproduced the very defect being closed, in the file most likely to be read for the answer. Prose only. No change to spec §5.5, the baseline corpus, the golden, or any test logic — the executable domain witness already matches the normative text, which is why it caught the three out-of-domain sources in the first place. `cargo test -p griff-swang` is 252 green, fmt and clippy clean. One instance is deliberately left: the INF-02-era decision-log entry at `decisions.log.md:2202` carries the same phrasing in another task's historical record. It is flagged rather than edited, since rewriting a prior task's decision entry is a different judgement from tightening this one's. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Inline comments:
In `@docs/swang/foundation-backlog.md`:
- Around line 484-486: Reconcile the corpus extent counts in the “Extent” entry
with the checked-in golden artifact and the corresponding record in
docs/decisions.log.md, updating the stale 47-case and 35-refusal values to the
verified counts while preserving the remaining coverage description.
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… domain fix CodeRabbit found the decision log still claiming the corpus "grew ... to 50 and 38, and a test now records that number". Verified against the artifact that sentence describes: the golden says `cases 47` with 35 distinct refusals, and the executable witness pins `DISTINCT_REFUSALS = 35`. Minor by severity, not by durability. `decisions.log.md` exists to be the historical evidence, and ending a task about evidence with a record that contradicts its own artifact would be a strange way to finish. Annotated rather than rewritten. 50 and 38 was a genuinely measured intermediate state — the extent after the corpus grew to reach the production sites, and before `83abc08` removed the three sources outside Law A's domain. Replacing the numbers would erase the chronology that explains why it was ever 50/38, which is the part a later reader needs. The log already treats the mistaken freeze causality this way, so the shape is consistent. No code, no golden, no test, no spec, no backlog change: the backlog was already the correct side at 47/35. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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…ence
Codex, verified: the level-1 guard declares the bare token `limits` a budget
name and then looks for it in almost-raw Rust source. `strip` removes only
lines that begin with `//`, so three benign forms fail CI today —
const _NOTE: &str = "no limits apply here"; fails
const _N: u8 = 1; // nothing to do with limits fails
let limits = compute_ui_limits(); fails
each reproduced by planting it in `eval.rs`. A comment-*only* line is
correctly ignored, so Codex's "inside a string or inline comment" is right
about trailing comments and wrong about whole-line ones; the defect is real
either way.
`limits` is an ordinary English word and an ordinary Rust identifier. A
guard that fails the build because someone wrote "no limits apply" in a
string is a guard the next person weakens — and then the frozen level has
lost its protection for a reason that had nothing to do with the frozen
level. Over-sensitivity is the right bias for this witness, but only toward
things that could actually reach the module.
This commit is the witness only: five benign forms that must not count, six
real ways to reach the budget that must. It fails on ce5dbe9 at the first
benign case.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
`limits` becomes `limits::`. Every real route to the module carries the `::` — `use crate::syntax::limits::…`, `super::limits::…`, an inline `limits::MAX_TOKENS` — while prose, string literals, and unrelated locals do not. The eleven specific names (`Level2Budget`, `MAX_SOURCE_BYTES`, `admit_token`, …) are untouched; only the generic one needed narrowing. `mentions` needed a matching correction. It demanded a non-word character on both sides of the needle, which is right for an identifier and wrong for a needle ending in punctuation: `limits::` is always followed by the name it qualifies, so the old rule would have matched nothing at all and the guard would have silently stopped watching for the module. A boundary is now required only on the sides where the needle's own edge is a word character. Proven, not assumed. The original planted probe — `const _PROBE: bool = limits::MAX_TOKENS > 0;` in `syntax.rs` — is still CAUGHT by both witnesses, and both benign forms that failed on ce5dbe9 now pass. The witness's precision stays lexical and heuristic, and the new test says so in as many words. `limits::` could still appear inside a string; guarding against that would mean a Rust parser, which costs more than this boundary is worth. What the trade must not buy is a guard that fails on English, and that is what this fixes. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
Codex, verified: AGENTS.md demands a prior-art search before anything non-trivial and demands the survey be recorded in the ADR or decision log. INF-06 had seven decision entries and no survey. The convention is live and well kept — Krumhansl–Kessler for key estimation, `guitar_dp`/`tuttut` for ADR-0019, and SWG-INF-04 immediately before this task surveyed rustc byte spans, rust-analyzer's `AstIdMap`, and rowan's `SyntaxNodePtr` — so this was not an oversight the repository tolerates. Marking INF-06 done with its own admission gate unsatisfied would have been a poor ending for a task that spent this much effort on being checkable. One entry, two halves, because the designs are unrelated. The frozen baseline is surveyed against `insta` and `expect-test`. The shape is adopted from both: a checked-in expected artifact, recompared each run, diff as failure. The feature each is built around is refused — `cargo insta review`/`accept`, `INSTA_UPDATE`, `UPDATE_EXPECT` — because those are right for a snapshot of current behaviour and wrong for the historical left-hand side of a comparison whose right-hand side does not exist yet. An updater would let the side under test rewrite the side it is tested against. The resource bounds are surveyed against `serde_json` and `rustc`. From the first: admission during the descent, with its documented warning that a caller disabling the limit must protect against stack overflow by other means — the same claim §5.11 makes. From the second: that a compiler may declare a bound as contract rather than discover it at runtime, which is what the before-the-first-accepted-program deadline formalises. Neither lineage supplies four axes or their numbers, and the entry says so outright. Recording a survey is not a licence to claim more inheritance than there is; nothing in `insta` taught this task to count tokens. The guard narrowing gets its own entry, and the backlog records both Codex findings with what was done about them. Local verification: 1463 tests green across core, swang, pattern, cli, and ui-core; `cargo fmt --all --check` and `cargo clippy --workspace --all-targets -- -D warnings` both clean. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Inline comments:
In `@swang/tests/level_two_budget_boundary.rs`:
- Line 219: Normalize the path representation used by the EXEMPT check in the
scanner before comparing it with EXEMPT entries, converting Windows backslashes
to the same separator format as the stored relative paths or comparing
normalized Path values. Preserve the existing leading-slash trimming and
exemption behavior.
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…hs are paths Two findings from the round on d82c8cf, both verified, both stated here before either is fixed. **Codex, generic method names.** `enter_block`, `leave_block`, `admit_source`, `admit_token`, and `admit_diagnostic` are ordinary identifiers. An unrelated `fn enter_block` anywhere under `swang/src` fails CI today; the witness for that fails at runtime on this commit. They are also close to redundant. `Level2Budget` is `pub(crate)` inside a private module whose only production constructor is `Level2Budget::declared()`, so a module that calls a method must first obtain a budget — which in practice means naming the type or the path in the same file, both of which stay on the list. "Close to", not "exactly": a helper returning `Level2Budget` and a call through type inference could in principle reach a method without either name appearing. That path is contrived enough to leave undefended deliberately, and saying so is more honest than claiming the markers cost nothing. Codex's own remedy — match the methods "only when qualified" — is not expressible. A call is `budget.enter_block(at)`, where `budget` is a local name; there is no qualified form for a text scan to find. **CodeRabbit, path separators.** The exemption compares `to_string_lossy()` against `"syntax/limits.rs"`, and `to_string_lossy` normalises nothing. On Windows the path stringifies with backslashes, never matches, and the budget module loses its exemption — so the guard fails on the one file it exists to ignore, which reads like a boundary breach and is not one. Every CI job is `ubuntu-latest`, so this is latent, not less real. The witness for it names `is_exempt`, which does not exist yet, so this commit fails to compile as well as failing at runtime. The fix will compare paths as paths rather than translating separators by hand. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
…hs as paths Two changes, both subtraction rather than machinery. **The five method markers are gone.** `enter_block`, `leave_block`, `admit_source`, `admit_token`, `admit_diagnostic` were ordinary identifiers carrying almost no detection: a caller cannot reach one without first obtaining a `Level2Budget`, and the type is `pub(crate)` in a private module whose only production constructor is `Level2Budget::declared()`, so the type or the path is named in the same file. The comment says "almost", not "none" — a helper returning the budget plus type inference could in principle reach a method with neither name present. That route is left undefended on purpose, which is a smaller price than failing CI on every `enter_block` in the tree. **The exemption is decided by path components.** `EXEMPT` is now `&[&["syntax", "limits.rs"], …]` and `is_exempt` compares component by component, so nothing depends on which character the platform uses as a separator. `display()` survives only in the failure message, never in the decision. Compared as paths rather than translating separators by hand: a test that guards a boundary should not also be emigrating between operating systems. Proven both ways. The original planted probe — `const _PROBE: bool = limits::MAX_TOKENS > 0;` in `syntax.rs` — is still CAUGHT by both witnesses, now reporting the exempt set as component lists. An unrelated `fn enter_block(_x: u8) -> bool` planted in `eval.rs` failed CI on the previous commit and passes here. 1464 tests green, fmt clean, clippy -D warnings exit 0. With this the lexical witness is converged. The residual — `limits::` or `Level2Budget` inside a string literal — is inherent to a text scan and is documented in the test as the price of not building a Rust parser to guard a boundary. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Inline comments:
In `@swang/tests/level_two_budget_boundary.rs`:
- Around line 61-66: Update names_the_budget to detect receiver method calls for
budget APIs, including patterns such as .admit_token(, without requiring a
budget type name; retain the existing exemption for bare method identifiers and
avoid matching unrelated bare enter_block calls.
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…is a reference CodeRabbit, on 616d258: `names_the_budget` accepts let mut b = budget_from_context(); b.admit_token(at)?; because no entry in BUDGET_NAMES appears in it. A level-1 module can therefore consult the level-2 budget through a helper or an inferred value and the boundary witness stays silent — the exact route the previous round's comment admitted was left undefended. The finding is correct. Verified against the code: lines 61-66 say so in their own words, and the module scan reads raw text, so nothing else would catch it. This is the witness alone. It fails here, at the first receiver-call assertion, with the other five tests green — the previous round's narrowing is not what is being questioned. `self.leave_block();` moves out of the benign list in the same change: it is a receiver call, so under the new obligation it must be caught, and leaving it listed as benign would have made the two tests contradict each other one commit later. Co-Authored-By: Claude Opus 5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
Five receiver-call markers join BUDGET_NAMES: `.admit_source(`,
`.admit_token(`, `.enter_block(`, `.leave_block(`, `.admit_diagnostic(`.
The bare identifiers stay out — banning those is what failed CI on an
unrelated `fn enter_block(...)` last round, and a definition, a binding
or a sentence never contains the punctuation a call carries.
Measured, not argued. With a helper-routed call planted in `eval.rs` —
a local type, an inferred receiver, and no budget name anywhere in the
file:
fn gate_of() -> Gate { Gate }
fn probe_call() -> bool { let b = gate_of(); b.admit_token(0) }
P20 @ c446b3b, whole-crate witnesses alone SURVIVED
P20 @ this commit CAUGHT by both
Also measured: P15 (a budget path in `syntax.rs`) is still CAUGHT, so
nothing was traded away; and P18 (a bare `fn enter_block` definition in
`eval.rs`) still does not fire, which is the property the previous
round bought and this change had to preserve.
P19 prices the trade honestly: an *unrelated* `.enter_block(` call in a
level-1 module is CAUGHT. That is a false positive, accepted knowingly —
a call to a block-entering method on a level-1 type is a rare shape, and
the cure when it appears is one exemption line with a visible reason.
Leaving the depth axis the only unwatched call would have cost more.
The residual is unchanged and still lexical: a call reached through a
trait object or a renamed re-export, or the literal text `.admit_token(`
inside a string, is beyond a text scan. Building a Rust parser to close
that is machinery this boundary does not earn.
Co-Authored-By: Claude Opus 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE
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Scope
SWG-INF-06 only: declare level 2's input bounds before level 2 accepts anything, ship the budget mechanism that will enforce them, and freeze the level-1 baseline Law A will be checked against.
Base:
main @ c44313c0cd82f3f2a8720437824d8cf5058b4e15.Head:
c104592c10d38afc3492fd3f0aab0ff3fc14bf50.No level-2 parsing, no level dispatch, no error recovery, no level-1 bound, no new dependency, no canonical-score-model change.
LANGUAGE_LEVELremains 1. Level 2 is not accepted and not frozen; Phase 4A stays open.Commit evidence
006c3efE0432: could not find limits in syntax15c2c6aLevel2ResourceLimits/Level2Budget, the four constants,SWG050917e6346b76aaccSWG0509registered, 4A-06's inherited bulletsabd630c83abc08e21266848c3f3be212668b014e9ab4eaeccMAX_TOKENSderived forwasm32, 4A-06 storage obligation94239d2ce5dbe9cc105aec4a5962limits::), not a bare wordd82c8cf0825732fn enter_blockmust not fire; the exemption is path components616d258EXEMPTcompared asPathcomponentsc446b3bc104592Nineteen commits, each RED before its GREEN. Nothing was rebased, squashed, or amended.
The external findings, and what they changed
Each was verified against the code before anything moved. None was deferred to 4A-06.
Codex (P2) —
MAX_TOKENShad an unstated representation assumption. Every premise holds:griff-swangis a direct dependency of the Cockpit, CI builds that forwasm32-unknown-unknown, and level 1'sTokenowns aStringeach, so four million would pass 150 MiB of vector spine before millions of individual string allocations. §5.11 promises a typed refusal rather than an allocation death; on a browser tab that promise would have failed.The number is kept and bound to a storage contract instead of being lowered. §5.11 now states it as a budget, not a struct layout:
4A-06 inherits the obligation to prove it with a witness, plus a preregistered probe: adding owned lexeme text to the level-2 token must be CAUGHT.
CodeRabbit (merge risk) — diagnostic exhaustion was not terminal. Against a cap of two,
diagnostics()reached 7 across repeated admissions and the reportedneededcount grew with it, describing an ever-larger hypothetical parse for a parse already terminated. Every call returnedErr, so no conforming caller could exceed the cap — latent, not correct. The rule is now saturation:cap = 2→ firstOk(1), nextErr(2, needed 3), every laterErr(2, needed 3).CodeRabbit (🟠 Major) — the documented scope of Law A conflicted with itself. Three passages said Law A covers "every
swang 1source — including invalid ones", while the section beneath them correctly scoped it to sources with a validswang 1header.The finding was right; its prescription was not. Both offered remedies contradict §5.5, which is normative: "For every source whose first line is a valid
swang 1header — whether its body is valid or not". The restriction is on Law A itself, not on this task's corpus, and widening the contract would have madeswang 2→SWG0001a Law A obligation — precisely the trap the domain witness exists to prevent, since 4A-06 must break it. So the loose prose was corrected upward to §5.5's precision in four places. No change to §5.5, the corpus, the golden, or any test logic.CodeRabbit (🟡 Minor) — the decision log's corpus extent went stale. It read 50/38 while the golden says
cases 47with 35 distinct refusals. Annotated rather than rewritten: 50/38 was a genuinely measured intermediate state, and replacing the numbers would erase the chronology explaining why it was ever 50/38.Codex (P1) — the prior-art survey AGENTS.md requires was missing. Recorded in
d82c8cf, in two halves.instaandexpect-testwere considered and refused: both are built around an update workflow that regenerates the artifact from whatever the code now does, and a baseline whose purpose is to be un-regenerable cannot rest on a library whose ergonomics are regeneration.serde_json's recursion limit supplied the budget's shape — a declared bound, checked before descent, with a typed error rather than an abort — and also the caution, since its limit can be disabled, which is whyLevel2ResourceLimitshas private fields anddeclared()as its only production constructor. These supplied the shape of the mechanism, not the numbers.Codex (P2, twice) then CodeRabbit (🟡 Minor) — the boundary witness was first too broad, then too narrow. Banning the bare word
limitswould have failed CI on English prose; banning bare method names failed on an unrelatedfn enter_block. Both were fixed. But dropping the names entirely left the opposite hole, which CodeRabbit then found: a helper returning aLevel2Budgetplus type inference reaches the API while naming nothing. The cure is to watch the call, not the name —.admit_source(,.admit_token(,.enter_block(,.leave_block(,.admit_diagnostic(. Punctuation is what separates a call from a definition, a binding or a sentence, and rustfmt keeps that exact form throughout this repository, so a plain substring suffices and no Rust parser is needed.Codex (P1) — "split the implementation from its red tests" — refuted, no change. The rule is evaluated per commit; the finding reads the PR as one flattened changeset.
c104592, the commit Codex names, touches one test file (+23/−10) and introduces no module.Level2Budgetis introduced by15c2c6a, whose parent is006c3ef— four files, none of them production, withlimits.rsabsent while the tests alreadyuse crate::syntax::limits::{…}, i.e. theE0432failing-test commit AGENTS.md:80-81 requires. The budget's 190 lines of covering tests are in RED; GREEN's +20 lines totests.rsareassert!(x.is_ok())→.expect(…)rewrites forced byclippy::assertions_on_result_states. Conceded without a change:level_two_budget_boundary.rsdid land in GREEN, but it is not "the tests that cover it" — it never constructs a budget, and beforelimits.rsexists its assertion is vacuously true, so there was no failing state to commit first.Two corrections to the backlog entry, made rather than glossed
The differential harness was stale. The entry asked for the pre-refactor parser to be diffed against the refactored one. INF-03 landed and deleted that parser, and its own acceptance already discharged that comparison. The live differential is Law A (§5.5) — and by the time 4A-06 supplies a right-hand side, the level-1-only build will be gone exactly as the pre-refactor parser is gone now. So the left-hand side is recorded now.
The formatter clause is not this task's. "A canonical formatter that only ever writes from a checked AST" is already owned by the completed writer lane and by 4A-09's checked-lowering contract, so it is recorded as owned elsewhere rather than implemented here.
The declaration
16_777_216(16 MiB)4_000_00064{ … };scoreroot is depth 1,[ … ]adds none256Counting semantics are part of the declaration: without them the numbers are decorative, since a token budget that counts differently is a different budget.
Every axis is admitted before the thing it counts exists — source before lexing, each token before storage, each block on entry, each diagnostic before it is appended. Checking
tokens.len()after lexing four million tokens is not a resource gate; it is an obituary written after the allocation.Depth and diagnostics are forward reservations, and the spec says so. The exact-score grammar has no recursive production and today's parser returns one diagnostic, so neither can currently be approached. They are declared anyway because §5.11's deadline is an admission rule stricter than the freeze boundary, not a consequence of it: by §5.3 level 2 stays provisional until Phase 4A is accepted, so a later bound would still predate the freeze, and §5.11 forbids it regardless because programs are by then already written against the level.
SWG0509is one code for four axes — they carry one meaning, and §5.10 forbids one number meaning two things. Precedence and per-axis breach locations are pinned in §5.11, including the rule that a source with nine hundred braces need not become a depth error if the grammar rejects it first: the resource checker must not understand more grammar than the parser does.No live caller, on purpose
Level 2 is unreachable on this build, so the budget has no caller. Wiring a gate into a parser that does not exist would be the fake half of the work. SWG-4A-06 inherits three acceptance bullets: construct and consult the budget before its first successful
swang 2result with the checks in the right places; add the end-to-end breach fuzz oracle once a fuzzed input can reach a level-2 parser; and prove theMAX_TOKENSstorage contract on thewasm32frontend. SWG-INF-05 inheritsadmit_diagnosticand the obligation to reconcile recovery with Law A first.The mechanism is sealed while sealing is free:
Level2ResourceLimitshas private fields anddeclared()as its only production constructor, so no future caller can satisfy the contract with bounds of its own choosing;Level2Budgetis neitherCopynorClone, so a running counter cannot be duplicated and spent twice.Two witnesses hold the level-1 line. One reads the level-1 modules through
include_str!; the other walks every shipped.rsunderswang/srcat runtime, because a hardcoded file list decays into a list of the files someone remembered.syntax.rsis scanned with only its baremod limits;permitted — it is the crate's re-export point and 4A-06's natural home for shared dispatch, and a budget consulted before the level branch is a level-1 bound whatever file it lives in.Both witnesses are lexical, and the file says so. They match qualified paths, the two type names, the four constants,
SWG0509, and the five receiver-call forms; bare method identifiers are deliberately excluded, because banning those failed CI on an unrelated definition. The residual is stated rather than hidden: a call reached through a trait object or a renamed re-export, or the literal text.admit_token(inside a string, is beyond a text scan. Building a Rust parser to close that is machinery this boundary does not earn.The Law A baseline
Recorded in a detached worktree at
c44313c, so the observations come from a build that has never seen this task's production code.git diff c44313c HEADover the level-1 path — header, lexer, parser, formatter, level-1 AST — is empty.swang 1header; only the body varies. Every corpus source must satisfyheader_level(source) == Ok(1).(code, message, span). No null fields are invented so a schema can boast of holding seven things.Debug, and not serde. Every struct is destructured with no..and every enum matched with no wildcard, so growth is a compile error.Extent, stated rather than implied: 47 cases reaching 35 distinct
(code, message)refusals, both verdicts, every level-1 enum variant, both states of every optional, and all eleven codes reachable inside the domain.the_corpus_pins_the_extent_of_its_own_samplerecords the number so the sample cannot shrink quietly.Two findings the evidence produced
A probe survived, and coverage by code turned out to be the wrong unit. Corrupting
SWG0403at one production site survived a corpus that reached every level-1 diagnostic code — becauseSWG0403is raised from four places andSWG0401from twenty-two. The corpus grew from 23 cases and 14 refusals to reach the sites. The failure was the recurring one: a check too narrow for the data it runs over, counting codes where the regressions live at sites.The baseline built to protect 4A-06 would have broken on correct 4A-06. Review found three sources in the artifact that the frozen pre-parser refuses outright, so they are outside Law A's domain. One was worse than merely out of scope:
swang 2was recorded asSWG0001, and 4A-06 exists to makeswang 2supported. The artifact would have declared 4A-06's whole purpose a regression, and the failure would have looked exactly like the safety net working.Falsification
20 probes, 0 survivors. Five states, each decided by an actual observation — never by an exit code, never by grepping for the word "error": CAUGHT, CAUGHT-BY-COMPILE, SURVIVED, INVALID PROBE, NOT REBUILT. Run with
--no-fail-fastand a monotonic mtime stamp.leave_blockis a no-op17e6346)83abc08)83abc08)83abc08)83abc08)syntax.rs83abc08); still CAUGHT atc10459248c3f3b)c4a5962)fn enter_blockdefinition trips the guard616d258); still silent atc104592.enter_block(call in a level-1 moduleb.admit_token(0)naming no budget identifierc446b3b→ CAUGHT @c104592Nine are recorded SURVIVED-before / CAUGHT-after, each measured at the pre-fix commit rather than as though the first suite had caught them. Four probe attempts were malformed — two failed to compile and so proved nothing about the witness — and were rewritten and rerun rather than banked.
P19 is the price of the lexical scan, taken knowingly: a level-1 type with its own
.enter_block(call would trip CI, and the cure when it appears is one exemption line with a visible reason. Leaving the depth axis the only unwatched call would have cost more.One probe is preregistered for 4A-06: adding owned lexeme text to the level-2 token must be CAUGHT.
Fuzz
swang_parseassertedstarts_with("SWG"), which acceptedSWG,SWGxyz, andSWG12345as registry codes. It now asserts the one shape the registry has, with no regex dependency. The same law is mirrored in acargo testwitness, since the fuzz matrix would not otherwise gate it. The limit-breach oracle is deliberately not claimed here — public parsing cannot reach level 2 on this build, so it would cover an execution path the binary cannot enter.Validation
Locally on
c104592:cargo fmt --all --checkclean;cargo clippy --workspace --all-targets -- -D warningsexit 0;cargo check --workspace --all-targetsclean.cargo test --workspacecannot link in the development container becauserust-lldcannot find-lasound; the same command fails identically at the base commit. CI is the acceptance source for the full workspace run and the fuzz matrix.CI on the exact head: run
33328336198, 14/14 success onc104592—check,msrv, and all twelve fuzz targets, no reruns.Review status on the exact head, stated precisely. Codex reviewed
c104592and raised one P1, refuted above with the commit evidence. CodeRabbit's position onc104592is two distinct things and should not be collapsed into one: its known receiver-call finding is independently marked "✅ Addressed in commits c446b3b to c104592" by CodeRabbit itself, on the actual fix; and its incremental run over the exact range616d258 → c104592(Run IDe71c70c5) produced no new comments — but that run skipped the sole changed file as "similar to previous changes", and its merge-risk block remains stamped "up to616d2". So this is a known defect confirmed fixed, plus an incremental run that generated nothing new, not a fresh full re-review of the file at the exact head.State after merge
LANGUAGE_LEVELstill 1;🤖 Generated with Claude Code
https://claude.ai/code/session_018vdRzztKXy8bA16tEzwgLE