Give bare handler-op calls one owner, and new(State<T>) its family's getter - #1300
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Two defects, one shape: a registry keyed by op NAME was answering a question it does not know the answer to. #1284 — a user-defined `fn get`/`fn put` called under a handler was lowered to the host cell intrinsic. Three sites decided independently whether a bare `get` meant the user's declaration or the operation: the checker resolves user-fn-first (E201/E202 report the user's signature), the declared-effect row withheld the intrinsic when `_fn_sigs` owned the name, and the handler expression installed `get`/`put` unconditionally. From check-green source that gave a silently wrong value, a module WASM validation rejects, or a spurious [E602] naming a State operation the program never contained. `vera.slots.bare_call_denotes_user_fn` now states the checker's rule once; the bare-call dispatch, the three bare-FnCall inference sites, and mono discovery consume it, each over its own name table. The gate is on the DISPATCH, not the registries: the registries record which cell a name reaches, which is true whatever the program's declarations are called. Withholding an entry answered both questions with one table — which is why the gate-only fix measured during PR #1283's review produced a differently-broken module, and why it also cost `State.put(5)` its cell in a program declaring `fn put` (`unknown func: $vera.put`), now lowered as the checker always meant. #1285 — `new(State<T>)` read the name-keyed `_effect_ops["get"]`, so under a multi-`State` row it took whichever family registered first while `old(State<T>)` was already family-keyed. The two sides of one `ensures` clause read different cells: `ensures(new(State<Bool>) == …)` under `effects(<State<Int>, State<Bool>>)` was check- and verify-green and died at load, and where both cells share a width it loaded and refuted a discharged postcondition at runtime. Codegen now carries a family→getter registry built from the per-family CellNames the registration site already computes, and `_translate_new_expr` keys on `_state_effect_family` exactly as `_translate_old_expr` does. Both fixes are proved RED first and by cross-component differential: every expected value is read off the CHECKER's resolution, never off what codegen emits, and each case records what it did before so none can go vacuous. All 256 pre-existing conformance and example programs emit byte-identical WAT (instrument mutation-validated: 39 files move when the predicate is stubbed). Two existing tests encoded the pre-fix codegen answer as their oracle and are corrected: `user_get_under_handler` expected the cell's clone where the checker names the function's, and the qualified-shadow test asserted the loud link failure its own docstring called the wrong semantics. Spec §7.4 now states the declarations-first rule and §7.3.3 that a form naming its type argument names its cell. Pinning both raises in `_translate_new_expr`/`_translate_old_expr` surfaced a checker gap they share — a contract may name a `State<T>` the row never declares — filed as #1298 with a KNOWN_ISSUES row and a test holding today's E699. Closes #1284 Closes #1285 Co-Authored-By: Claude <noreply@anthropic.invalid>
Adversarial-review follow-up on c56c55a. S1 — `_collect_expr_effects`, the checker's `async(e)` commutativity walk, asked `lookup_effect_op` BEFORE `_lookup_function_scoped`: the one op-first consumer left, in the file the ownership predicate was added to. A user function named after a built-in operation contributed the OPERATION's parent effect instead of its own declared row, wrong in both directions and both measured. A PURE `fn get`, in a program with no State anywhere, drew `[W002] async argument performs State effects`. A `fn get` performing IO, under a row naming `Http` first, drew NO warning — the walk bound the name to `Http.get`, which is inside the commutative whitelist, and withheld the warning the program is owed. Now declarations-first through the same predicate, so the analysis reasons about the row the checker actually bound, and the comment claiming it resolves "like the call checker above" is true. Each direction is pinned with its rename control (`gett` / `fetch`, correct throughout, so the name is isolated as the cause) and with a control that an unshadowed bare `get(())` under a `State<Int>` row still warns — without which deleting the op lookup outright would pass every case. The sole consumer of the walk is W002, so that is the whole blast radius; all 256 pre-existing corpus programs stay byte-identical. M2 — `bare_call_denotes_user_fn`'s residual-divergence paragraph described a `where`-helper divergence that does not exist and omitted the one that does. Measured: a local helper is registered as `holder$where$get`, never bare, its holder's call sites are rewritten with it, and a sibling function's bare `get` correctly reaches the intrinsic (probe returns the cell's 42, the checker's answer). What is real is #1299: `_fn_sigs` keys an import the call site cannot see under its BARE name, so the predicate answers "user-owned" where the checker resolved the operation — check-green source, silent wrong value on one route and a load failure on the other. Rewritten to state that, with the reference, and to say it is a property of the TABLE rather than of the rule. N2 — both consumer lists omitted `_handler_always_throws`'s `throw_installed`, which asks the same question for `Exn`'s operation. Added to `slots.py` and to `_bare_call_denotes_op`, along with the `async` walk above. KNOWN_ISSUES gains the #1299 row, one-to-one with the tracker. Spec §7.4's declarations-first sentence stands unchanged: it states the language rule the checker implements, and #1299 now tracks codegen's violation of it — the rule in the spec, the gap in the row. Co-Authored-By: Claude <noreply@anthropic.invalid>
Wording follow-up on bcd2943, whose replacement paragraph over-claimed in the direction it was correcting. It said the hoists move EVERY `where` helper out of the bare namespace, so a helper shadows an operation name in its own body "and nowhere else". True under a NON-generic parent; false under a generic one, which keeps a bare `_fn_sigs` key beside its clone-qualified one — measured on `ch09_generic_where_helper.vera`, whose `helper` and `id` are both keyed bare. Weaponized: a `forall<T>` holder's helper named `get` claims a SIBLING's bare `get(())` under a `State<Int>` row, and the program fails to assemble with `unknown func: failed to find name $get` and no E-code, from check-green source; the rename control returns 4207, the checker's answer. So it is a third #1299 route, not a counter-example to it, and the docstring now says so. It is also the LOUD one, for a reason the row now records: the bare key exists in the signature TABLE while no bare SYMBOL is ever emitted (the helper is only `holder$Bool$where$get`), so the call dangles at WAT assembly instead of reaching a wrong function. The two import routes remain the dangerous ones — silent wrong value where the cells share a width, load failure where they do not. The row's fix direction is corrected with it: module scope is not enough, because a generic's `where` helper IS in the module and still is not in a sibling's scope. `_known_fns` has to carry the names visible in the compiling declaration's LEXICAL scope. Docs only — docstring prose in `slots.py` and `_bare_call_denotes_op`, the KNOWN_ISSUES row, and the CHANGELOG caveat clause. No executable line changes. Co-Authored-By: Claude <noreply@anthropic.invalid>
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📝 WalkthroughWalkthroughThe compiler now gives bare user functions precedence over effect operations across checking, inference, monomorphisation, and WebAssembly generation. ChangesEffect resolution and State getter selection
Estimated code review effort: 4 (Complex) | ~45 minutes Mergeability Score: ⚪ Minimal · up to The PR corrects handler-operation ownership and family-specific State getters, with the reported checks passing. No actionable merge-blocking risk remains; only a localized README wording follow-up is indicated. Sequence Diagram(s)sequenceDiagram
participant Program as Vera program
participant Checker as TypeChecker
participant Mono as Monomorphizer
participant Codegen as WASM code generator
participant Runtime as State runtime
Program->>Checker: resolve bare call
Checker->>Mono: retain user-function or operation ownership
Mono->>Codegen: infer and lower selected call
Codegen->>Runtime: invoke user function or State operation
Runtime->>Program: return value or updated state
Possibly related issues
Possibly related PRs
Suggested labels: 🚥 Pre-merge checks | ✅ 7 | ❌ 1❌ Failed checks (1 warning)
✅ Passed checks (7 passed)
✨ Finishing Touches📝 Generate docstrings
🧪 Generate unit tests (beta)
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## release/v0.1.12 #1300 +/- ##
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Inline comments:
In `@tests/test_handler_op_ownership_1284.py`:
- Around line 86-90: Update the test’s user-defined get operation to have a
distinct arity, such as two parameters, and invoke it with three arguments so
the resolver must use the user-function path. Keep asserting a single E201
error, but change the description assertion to expect the user function’s
two-argument arity.
- Around line 118-123: Replace substring-based WAT assertions with boundary-safe
re.search checks: in tests/test_handler_op_ownership_1284.py lines 118-123,
match exact get and vera.state_get_Int call targets; lines 193-206 and 233-240,
exact get; lines 261-269, exact put; lines 330-337, exact vera.state_get_Int and
setter imports; lines 394-398, escape shadowed and match the complete dynamic
call symbol. In tests/test_nat_narrowing_return_differential.py lines 2763-2767,
match the exact vera.state_put_Int call. Use identifier-boundary-aware patterns
for every required and forbidden symbol.
In `@tests/test_new_state_family_1285.py`:
- Around line 314-318: Update the test around _run(_REFUTED) to capture the
raised WasmTrapError with pytest.raises, then assert excinfo.value.kind equals
"contract_violation" so it verifies the normalized Tier 3 postcondition trap.
In `@vera/README.md`:
- Line 726: Update the description of bare_call_denotes_user_fn to cover all
bare effect-operation call sites, including throw_installed, rather than
limiting the scope to get and put; state that get, put, and throw are examples.
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docs/SKILL.mdis excluded by!docs/**docs/index.htmlis excluded by!docs/**docs/index.mdis excluded by!docs/**docs/llms-full.txtis excluded by!docs/**docs/llms.txtis excluded by!docs/**tests/conformance/ch07_op_name_user_shadow.verais excluded by!**/*.veratests/conformance/ch07_state_new_family.verais excluded by!**/*.vera
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AGENTS.mdCHANGELOG.mdCLAUDE.mdFAQ.mdKNOWN_ISSUES.mdREADME.mdROADMAP.mdSKILL.mdTESTING.mdspec/07-effects.mdtests/conformance/manifest.jsontests/test_checker_effects.pytests/test_handler_op_ownership_1284.pytests/test_mono_effect_op_naming_1207.pytests/test_nat_narrowing_return_differential.pytests/test_new_state_family_1285.pyvera/README.mdvera/checker/calls.pyvera/checker/core.pyvera/codegen/functions.pyvera/monomorphize.pyvera/slots.pyvera/wasm/calls.pyvera/wasm/calls_handlers.pyvera/wasm/context.pyvera/wasm/inference.pyvera/wasm/operators.py
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aallan/vera-bench(manual)
CodeRabbit round on PR #1300; all four findings addressed. The resolution pin asserted `"expects 1 argument"` against a user `get` of arity 1, and its comment claimed the message body distinguished the two candidates. It does not — the built-in `get(@Unit)` is arity 1 too, so that clause discriminates nothing. (The test was not actually admitting an op-first resolver: measured, the operation path reports E203 "Effect operation 'get'" where the function path reports E201, and the E-code assertion already caught it. The comment was wrong, not the test.) The fixture now takes TWO parameters and is called with three, so all three ways the candidates differ are asserted — code, noun, and arity — and the comment says which is which. Mutation-validated: forcing the checker op-first turns it red on `'E203' == 'E201'`. WAT symbol assertions were prefix tests: `"call $get" in wat` also accepts `call $getx` and `call $get$Int`, the latter being what a monomorphized clone of a same-named generic emits — a false PASS in the direction that matters, since these pin a dispatch target. Replaced with `wat_calls()` in `tests/codegen_helpers.py`, anchored on a name-character boundary and matching the `return_call` spelling too. Applied to every such site in the three files, including the three in `test_new_state_family_1285.py` the review did not enumerate, so the PR's own tests are consistent. The helper is unit-checked against `getx`, `get$Int`, `state_get_Int2` and `state_get_IntBox`. `test_a_false_postcondition_still_traps` passed for ANY `WasmTrapError`, including an `unreachable` from a GC or narrowing guard — which would prove nothing about the postcondition it exists to establish. Now asserts `kind == "contract_violation"` (measured), mutation-validated. `vera/README.md`'s one-line description of the predicate still said `get`/`put` after `throw_installed` joined the consumers, the same completeness gap already fixed in the two docstrings. Test-only apart from that one README line; the compiler is untouched. Co-Authored-By: Claude <noreply@anthropic.invalid>
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v0.1.12 burndown, group A: the handler-op ownership pair — #1284 and #1285. (Fixes ride to
mainwith the release PR; no close keywords here.)The fixes
fn get/fn putcalled in a handler clause body #1284 — a user-definedfn get/fn putcalled where a handler installs clause-scope ops was hijacked by codegen: same-family nesting produced a spurious[E602], different-family nesting emitted the intrinsic for the user call and failed WASM validation, all from check-green source. The repair is one ownership predicate,vera.slots.bare_call_denotes_user_fn— the checker's declarations-first rule stated once — consumed by the checker's resolution, the checker'sasynceffect walk, codegen's bare dispatch and inference sites,throw_installed, and monomorphization discovery. The load-bearing design call: gate the dispatch, not the registries — withholding registry entries was measured to break the qualified spelling's cell (State.put(5)beside a userfn putlinked against nothing on the base tree). Qualified delegations passdenotes_op=Trueand land on their intrinsics; both spellings now go where the language says.new(State<T>)reads the wrong cell's getter under a multi-Stateeffect row #1285 —new(State<T>)in a postcondition read the name-keyed getter (whichever family installed last) whileold(State<T>)was family-keyed: the multi-Staterepro was check- and verify-green and died at load, and the same-width variant ran to a refuted proved postcondition — the soundness differential in the flesh.state_getters(family → getter) is built at the declared-row registration from theCellNamesalready computed there;_translate_new_exprnow keys exactly as_translate_old_exprdoes.The review arc (three rounds to fixed point)
Round 1 (adversarial, eight attack lines): the fixes held everywhere — delegation paths enumerated and run, alias/refined family keying probed through §7.5.1 collapse, the corrected test oracles verified non-circular against checker-side type oracles, the zero-mover corpus claim reproduced independently (256/256 byte-identical WAT; 51 movers under the reviewer's own sensitivity stub). It also found: the op-first fourth consumer in
_collect_expr_effects(spurious W002 naming State in a program containing none; a real IO warning silently withheld under theHttpwhitelist — both name-isolated by rename controls), a docstring describing a divergence that doesn't exist, and #1299 — the pre-existing checker↔codegen table divergence (invisible imports keyed bare; silent7007-for-42007, type-oracle-proven), filed, tabled, and queued into group B.Round 2 (the fix commit): the W002 walk reordered through the predicate with a five-test battery (both directions, two rename controls, one degeneracy control) and a three-mutant matrix proving neither direction is vacuous; diagnostics-level corpus sweep 258/258 identical, WAT 256/256.
Round 3 (focused): one wording finding — the corrected docstring overclaimed "every helper", and chasing it surfaced route three into #1299: a generic parent's
where-helper keeps a bare_fn_sigskey, so a helper namedgetbreaks a sibling's compile (loudunknown func, no E-code; the rename control returns the checker's answer). The mechanism — bare key in the signature table, no bare symbol emitted — is why this route is loud-never-wrong, and it corrects #1299's fix direction from module scope to lexical scope (recorded on the issue). Final commit is prose-only.Also in the branch
Two conformance promotions (
ch07_op_name_user_shadow,ch07_state_new_family, both run-level); spec §7.4 gains the declarations-first sentence and §7.3.3 the cell-naming sentence (§7.4's MUST is the language rule the checker implements; #1299 tracks codegen's violation — tracked-violation pattern, row in place); #1298 filed from the round (undeclared-family contracts land on E699 — previouslynew()was worse than loud there) with today's behavior pinned and its# pragma: no covermarkers honestly removed; KNOWN_ISSUES: #1284/#1285 rows out, #1298/#1299 rows in.Gates at head: 10,369 passed / 216 conformance / 42 examples / mypy clean / corpus differentials at zero movers (WAT and diagnostics). Merges into
release/v0.1.12on convergence per the burndown's granted authority.Summary by CodeRabbit
Bug Fixes
get,put, andthrowfunctions are now distinguished correctly from effect operations.new(State<T>)now reads from the specified state family.Documentation
Tests