---
title: "mlab-tests-octave-ext — Mova code model"
description: "Mova code model of mlab/tests/octave_ext.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/mlab/tests/octave_ext.rs.groupant/"
---
Elamur: [Mova](https://md.mova.elamur.ai/free/en/) · [Dictionary](https://md.dictionary.elamur.ai/free/en/) · [Research](https://md.research.elamur.ai/free/en/) · **Groupants**

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# mlab-tests-octave-ext

The groupant beside mlab/tests/octave_ext.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

- **kind:** groupant
- **status:** partial source bound model
- **source:** [`mlab/tests/octave_ext.rs`](https://github.com/ElamurAI/mova-free/blob/main/mlab/tests/octave_ext.rs)
- **source SHA-256:** `083430129fcb3a86…`
- **repository folder:** [`mlab/tests/octave_ext.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/mlab/tests/octave_ext.rs.groupant)
- **repository commit:** `855da7bd4a7b`

> **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](#approximant) |
| **ast** | partial | `syntax.json` |
| **composition** | partial | [composition](#composition) |
| **cost** | symbolic source derived | [invariant](#invariant) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | executed bounded checks | [tests](#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](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial source derived model | [reverse_reconstruction](#reverse-reconstruction) |
| `state_invariant` | state_invariant | partial source derived model | [state_invariant](#state-invariant) |
| `failure_precedence` | failure_precedence | partial source derived model | [failure_precedence](#failure-precedence) |
| `representation_transport` | representation_transport | partial source derived model | [representation_transport](#representation-transport) |
| `resource_cost` | resource_cost | partial source derived model | [resource_cost](#resource-cost) |

## Parts

- [mlab-tests-octave-ext-block-extraction](https://md.groupants.elamur.ai/free/en/mova/mlab/tests/octave_ext.rs.groupant/block-extraction.groupant/)

## Model text


### descriptant

#### mlab-tests-octave-ext

External Octave test extraction, lexical scope filter and subprocess report harness; only synthetic extraction helpers run here.

##### 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

files recursively sorts candidate m/cc paths. blocks collects column-zero %! directives with shared initialization and accumulated functions; calls/assigned approximate builtin scope. Ignored measurement launches timeout per selected block and classifies hang/crash/error/assert/pass.

##### 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

Current synthetic checks invoke blocks/calls/assigned only. No OCTAVE_TESTS/OCTAVE_OUT corpus discovery, subprocess measurement or external data is used.

##### Failure ordering

Directory read failure returns silently, file read defaults empty. timeout124 takes precedence over crash then expected-error then normal success/assert/error. Process launch errors panic.

##### Cost

Helper scans O(text bytes) plus accumulated prefix copies; external traversal and per-block subprocess limit ten seconds are unexecuted effects. Output memory grows with report rows.

### composition

#### Composition

files recursively sorts candidate m/cc paths. blocks collects column-zero %! directives with shared initialization and accumulated functions; calls/assigned approximate builtin scope. Ignored measurement launches timeout per selected block and classifies hang/crash/error/assert/pass.

Scope names use HashSet membership; files sorted before processing. Expected-error pattern/id is stripped without matching actual error text.

##### block-extraction

Group %! lines by known directive; shared replaces initialization, completed function appends definition, assert/test/error append blocks with current prefixes. Error strips id= and angle-bracket pattern.

Boundary: Produced kind distinguishes Assert/Test/Error; no implementation evaluation or external file read in helper.

##### 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-octave-ext

Source-derived partial relations; finite checks do not prove universality.

### behavior_complement

Non-column-zero %! excludes extraction. Unknown directives exclude ordinary test output. Calls filter excludes double-quoted text but does not exclude all comments or single-quoted strings; it is no parser proof.

### reverse_reconstruction

Same blocks admit arbitrary non-%! implementation text and ignored directives; same call-name set admits many syntactic forms. Report status cannot reconstruct process stderr, only truncated first-error detail survives.

### state_invariant

Current synthetic checks invoke blocks/calls/assigned only. No OCTAVE_TESTS/OCTAVE_OUT corpus discovery, subprocess measurement or external data is used.

### failure_precedence

Directory read failure returns silently, file read defaults empty. timeout124 takes precedence over crash then expected-error then normal success/assert/error. Process launch errors panic.

### representation_transport

Scope names use HashSet membership; files sorted before processing. Expected-error pattern/id is stripped without matching actual error text.

### resource_cost

Helper scans O(text bytes) plus accumulated prefix copies; external traversal and per-block subprocess limit ten seconds are unexecuted effects. Output memory grows with report rows.

### tests

#### Evidence and limitations

Selected named outcomes: wave30_synthetic_selection_helpers. Each ran twice debug and twice release with sorted identical nonempty outcomes and numeric exit 0. Source-specific compiled control exercised "wave30_synthetic_selection_helpers": 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: Current synthetic checks invoke blocks/calls/assigned only. No OCTAVE_TESTS/OCTAVE_OUT corpus discovery, subprocess measurement or external data is used.


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.