---
title: "modelcheck-syntax-source-reread — Mova code model"
description: "Mova code model of tools/modelcheck/src/syntax.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/tools/modelcheck/src/syntax.rs.groupant/artifact-integrity.groupant/source-reread.groupant/"
---
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# modelcheck-syntax-source-reread

The groupant beside tools/modelcheck/src/syntax.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_fragment
- **status:** partial
- **source:** [`tools/modelcheck/src/syntax.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/modelcheck/src/syntax.rs)
- **source SHA-256:** `35c315cc9b581bea…`
- **covers:** Fresh source and projection metadata consistency (bytes 16547–17204)
- **part of:** [modelcheck-syntax-artifact-integrity](https://md.groupants.elamur.ai/free/en/mova/tools/modelcheck/src/syntax.rs.groupant/artifact-integrity.groupant/)
- **repository folder:** [`tools/modelcheck/src/syntax.rs.groupant/artifact-integrity.groupant/source-reread.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/modelcheck/src/syntax.rs.groupant/artifact-integrity.groupant/source-reread.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 | [Forward](#forward) |
| **ast** | partial | `../../syntax.json` |
| **cost** | partial | [Cost](#cost) |
| **descriptant** | partial | [Descriptant](#descriptant) |
| **invariant** | partial | [Invariant](#invariant) |
| **tests** | partial | [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 relational specification | [behavior_complement](#behavior-complement) |
| `reverse_reconstruction` | reverse_reconstruction | partial relational specification | [reverse_reconstruction](#reverse-reconstruction) |
| `same_length_edit` | same_length_edit | partial relational specification | [same_length_edit](#same-length-edit) |
| `read_error_order` | read_error_order | partial relational specification | [read_error_order](#read-error-order) |
| `limitation_nonemptiness` | limitation_nonemptiness | partial relational specification | [limitation_nonemptiness](#limitation-nonemptiness) |
| `postread_race_limit` | postread_race_limit | partial relational specification | [postread_race_limit](#postread-race-limit) |

## Model text


Subject: current manifest source SHA and exact UTF-8 range [16547,17204). The observation is one completed scoped call with adequate resources; source-derived relations are partial specifications. Filesystem checks describe sequential reads, not an atomic snapshot.

### Forward

Read current source as UTF-8 and hash exact bytes; require expected SHA. Then require byte length and utf8_bytes_half_open unit, syn-2 parser and a nonempty array of nonblank limitation strings before touching nodes.

### Invariant

A parsed artifact memo never replaces source reads or hashing. Equal byte length is insufficient; digest consistency precedes metadata checks. No atomic repository snapshot is promised.

### Cost

O(S) source bytes read/hash with O(S) text storage, plus limitation string scan. Work repeats for each artifact validation even after a memo hit.

### Descriptant

Wave34, 2026-10-31: deeper scope retained under its existing parent without replacing historical views. Decode reuse was proposed before edits and checked against actual reference decoding; behavioral controls and repeated native receipts remain finite evidence. No numerical surrogate is justified for categorical validation outcomes; no percentage accuracy or complete semantic proof is claimed.

### Tests

Exact native test: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Parent tests additionally exercise integration and failure order. Current evidence is in ../../wave34-evidence.md; old evidence remains explicitly historical in wave33-evidence.md at the source root.

### behavior_complement

Exclude successful passage for changed source digest, invalid UTF-8 read, mismatched byte count/unit/parser or empty/nontext limitations. Cached JSON cannot exempt any of these exclusions.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.

### reverse_reconstruction

Given success and expected h, compatible source texts have SHA256(text)=h and length equal to metadata. Compatible limitation arrays contain at least one nonblank string, but their truth is not reconstructed.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.

### same_length_edit

Hold byte count constant and replace source tokens. A changed digest rejects before parser metadata or nodes, demonstrating byte count does not certify freshness.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.

### read_error_order

Source IO/UTF-8 failure occurs before fresh hash comparison; hash mismatch occurs before length/unit/parser/limitations. The same malformed metadata can therefore be masked by an earlier source failure.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.

### limitation_nonemptiness

Acceptance constrains each array element to nonempty trimmed text and requires the array itself nonempty. The validator neither recognizes a fixed limitation vocabulary nor checks its semantic truth.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.

### postread_race_limit

Success describes the bytes just read. A mutation after the read is outside the invariant; repeated rehashing narrows stale reuse but does not create filesystem transaction semantics.

Assurance: source-derived partial relation; fixed source revision and stated scope. Oracle: syntax::wave34_tests::cached_decode_still_validates_source_and_nodes_and_measures_cost. Finite observations do not establish universal completeness.