Elamur Groupantsmlab-tests-vmm-suites
The groupant beside mlab/tests/vmm_suites.rs in the Mova repository: what the code computes, what it never does, how to go back from its outputs, its invariants, cost and checks.
Facts
Implementation material. A Mova code model describes this code at one source revision: partial models, finite checks and their stated scope. It is not a reviewed general exposition, and its labels are shown as written, never raised.
Components
| component | label | where |
|---|---|---|
| approximant | partial | approximant |
| ast | partial | syntax.json |
| composition | partial | composition |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | tests |
Obernants
The typed relations around the forward model: the behaviour complement (what the code never does), the reverse reconstruction (every input compatible with an output) and specialised views.
| id | type | label | where |
|---|---|---|---|
behavior_complement | behavior_complement | partial source derived model | behavior_complement |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
state_invariant | state_invariant | partial source derived model | state_invariant |
failure_precedence | failure_precedence | partial source derived model | failure_precedence |
representation_transport | representation_transport | partial source derived model | representation_transport |
resource_cost | resource_cost | partial source derived model | resource_cost |
Model text
descriptant
mlab-tests-vmm-suites
Frozen VMM400 integrity/baseline harness and SHA helper; this epoch runs synthetic SHA inputs only.
Modeling epoch — 2026-10-31
Prospective source read preceded edits. Bounded synthetic checks and selected existing safe tests exercise actual code; paired debug/release results and compiled negative-control assertions are retained externally. Frozen scenario, corpus, external measurement, full-school and training effects are unexecuted. Partial lexical syntax supplies no macro-expanded or semantic proof.
approximant
Forward relation
sha256_hex writes PID/atomic-sequence temporary bytes, invokes sha256sum, removes file, returns first stdout token. load would verify ten frozen files, check would run400 and compare exact sorted known-red IDs, VM gate compares captured output.
Domain
Valid Rust value/storage invariants and available bounded resources; exact branch and effect observations only.
Executable approximant gap
No useful percentage-error surrogate is established for these categorical, textual or effectful observations. Supported future caps are 1%, 2%, 5%, 10%; no executable approximation or production substitution is claimed.
invariant
Invariants and costs
FROZEN and KNOWN_RED unchanged. Atomic counter plus PID distinguishes helper temporary names within process; cleanup occurs after subprocess output, not after every panic path.
Failure ordering
Write/launch errors panic; subprocess exit status is not checked; empty output gives empty digest. Load would hash before parsing; scenario count checked before suite-run baseline comparison.
Cost
Synthetic helper O(input bytes + subprocess startup); unexecuted load O(total frozen bytes) and scenario interpretation. Temporary file effects only for abc and empty inputs.
composition
Composition
sha256_hex writes PID/atomic-sequence temporary bytes, invokes sha256sum, removes file, returns first stdout token. load would verify ten frozen files, check would run400 and compare exact sorted known-red IDs, VM gate compares captured output.
Digest is first whitespace-separated lossy-UTF8 stdout token, not structurally validated. Red IDs sorted before equality; independent gate has same=400 assertion.
Interaction limit
Local fragment relations compose only with valid Value storage, caller error propagation and delegated providers. They do not establish whole-interpreter or host-filesystem guarantees.
models
Typed models — mlab-tests-vmm-suites
Source-derived partial relations; finite checks do not prove universality.
behavior_complement
Synthetic SHA helper execution excludes reading frozen scenario files because load/check are not called. The baseline check would exclude either newly red or newly green IDs; no such claim is established by this epoch.
reverse_reconstruction
SHA output admits all byte preimages under digest relation; mathematical collision possibility prevents unique reconstruction. Equal red sets admit many changed individual outputs and do not alone prove byte identity.
state_invariant
FROZEN and KNOWN_RED unchanged. Atomic counter plus PID distinguishes helper temporary names within process; cleanup occurs after subprocess output, not after every panic path.
failure_precedence
Write/launch errors panic; subprocess exit status is not checked; empty output gives empty digest. Load would hash before parsing; scenario count checked before suite-run baseline comparison.
representation_transport
Digest is first whitespace-separated lossy-UTF8 stdout token, not structurally validated. Red IDs sorted before equality; independent gate has same=400 assertion.
resource_cost
Synthetic helper O(input bytes + subprocess startup); unexecuted load O(total frozen bytes) and scenario interpretation. Temporary file effects only for abc and empty inputs.
tests
Evidence and limitations
Selected named outcomes: wave30_synthetic_hash_helper. Each ran twice debug and twice release with sorted identical nonempty outcomes and numeric exit 0. Source-specific compiled control exercised "wave30_synthetic_hash_helper": compile exit 0, assertion-red exit 101, exact-restored rerun exit 0. External receipts: octopus-wave30-io-2026-10-31 (native-commands.json, positive-receipts.json, controls.json).
Scope: FROZEN and KNOWN_RED unchanged. Atomic counter plus PID distinguishes helper temporary names within process; cleanup occurs after subprocess output, not after every panic path.
AST projection generated twice to fresh files and compared byte-for-byte. Runtime evidence is finite and does not establish every branch, allocation failure, backend implementation or effect path. No optimization or speed claim.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/mlab/tests/vmm_suites.rs.groupant/