---
title: "mathlib-fetch-manifest — Mova code model"
description: "Mova code model of tools/mathlib/src/fetch.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/tools/mathlib/src/fetch.rs.groupant/manifest.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**

This page as HTML: <https://groupants.elamur.ai/free/en/mova/tools/mathlib/src/fetch.rs.groupant/manifest.groupant/>

# mathlib-fetch-manifest

The groupant beside tools/mathlib/src/fetch.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 bound model
- **source:** [`tools/mathlib/src/fetch.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/mathlib/src/fetch.rs)
- **source SHA-256:** `9a892fd61299338f…`
- **covers:** Partition Done by items[item_idx].slug in a BTreeMap; serialize sorted slug groups to JSONL, then serialize Done in original order to TSV. (bytes 16884–19775)
- **part of:** [mathlib-fetch](https://md.groupants.elamur.ai/free/en/mova/tools/mathlib/src/fetch.rs.groupant/)
- **repository folder:** [`tools/mathlib/src/fetch.rs.groupant/manifest.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/mathlib/src/fetch.rs.groupant/manifest.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` |
| **cost** | partial | [invariant-and-cost](#invariant-and-cost) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant-and-cost](#invariant-and-cost) |
| **tests** | 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) |
| `license_union` | license_union | partial source derived model | [license_union](#license-union) |
| `format_nondeterminism` | format_nondeterminism | partial source derived model | [format_nondeterminism](#format-nondeterminism) |
| `paired_outputs` | paired_outputs | partial source derived model | [paired_outputs](#paired-outputs) |
| `item_index_coupling` | item_index_coupling | partial source derived model | [item_index_coupling](#item-index-coupling) |

## Model text


### descriptant

#### mathlib-fetch-manifest

Partition Done by items[item_idx].slug in a BTreeMap; serialize sorted slug groups to JSONL, then serialize Done in original order to TSV.

##### Epoch 2026-10-31

Prospective model retained before changes. Existing production bytes are preserved; additions are bounded inline tests. Nine source groupants expose ingestion and routing boundaries; typed children bind exact source bytes and reuse their parent syntax projection. Native tests run twice per profile; behavior mutants run as compiled source changes and exact bytes are restored before positive checks.

Important retained observation: network-looking helpers are not all pure (DNS inside github_host and books build); selection deliberately excludes those effects. Mixed-format manifest order is not deterministic, and error paths do not imply rollback.

No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.

### approximant

#### Forward relation

Partition Done by items[item_idx].slug in a BTreeMap; serialize sorted slug groups to JSONL, then serialize Done in original order to TSV.

Model observations include returns, retained state and ordered partial effects; on external failures the successful-prefix relation replaces a total-function claim.

### catalog

### behavior_complement

Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.

Multiple distinct licenses cannot yield the single-license group's license URL; it is empty. Empty Done writes zero JSONL rows and only TSV header, assuming successful writes.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.

Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.

### reverse_reconstruction

Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.

A JSONL group determines a fiber of Done orderings across different slugs and original Item arrays; repeated item_idx and unused Items are not recoverable. TSV preserves Done row order but omits orig metadata.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.

Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.

### license_union

Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.

For group license set L, |L|=1 selects first license and status; otherwise label='per file: '+sort(L), status=open. Domain contains valid Done indices.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.

Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.

### format_nondeterminism

Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.

format joins distinct final extensions from HashSet; membership is determined, order is unspecified. Exact output comparison must not impose an order absent from the source.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.

Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.

### paired_outputs

Subject: mathlib-fetch-manifest, source SHA-256 9a892fd61299338f640f9d8d08471ef7f09cac19235ad80b90d894a12489996d; finite transition observation.

JSONL flush precedes TSV create. A TSV failure can coexist with completed JSONL; outputs are not atomically coupled. Source-derived effect model; no actual DB consumer test.

Domain: stated source predicates, bounded inputs and available resources; arithmetic assumptions and external effect gaps as in the invariant. Operator is the stated relation/projection; complement is a source-derived inner exclusion, reverse retains compatible antecedents. Other views are source-derived partial constraints, not inverse laws.

Evidence: tests.md identifies executed helpers and unexecuted paths. No universal guarantee follows from the finite fixtures.

### item_index_coupling

Every Done index selects both its grouping slug and all input metadata from the same Item. Changing a valid index can move a file between groups without changing bytes/hash; out-of-range index panics before serialization. The model requires valid indices and does not infer filesystem existence from manifest rows.

Subject and source identity: manifest.json. Domain: scoped forward/invariant; relation is source-derived and partial. Evidence: tests.md distinguishes actual checks from unexecuted effect paths; finite fixtures do not prove all inputs.

### tests

#### Bounded evidence

Selected actual source checks:

- mathlib::fetch::tests::compacts_sources
- mathlib::fetch::tests::ext_and_licenses
- mathlib::fetch::wave33::list_signature_hash_and_existing

These checks are file-level evidence; fragment branches not reached by these names remain source-derived.

External wave33 mathlib receipt retains native-commands.json, numeric statuses, raw debug/release logs, sorted exact outcomes, mutation logs and original/restored hashes. Seventeen named checks pass twice per profile; six production behavior mutants reject in both profiles, with restored positives. Source syntax is regenerated twice after formatting and compared byte-for-byte. Structural validation tests bindings, not Rust semantics.

No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.

### invariant-and-cost

#### Invariant and cost

##### Invariant

Per-group files keep Done order. A single license gives first item's license URL/status; multiple licenses sort code strings and clear group license URL.

##### Cost

O(D log S) grouping plus per-group license sorting O(L log L); whole serialized files in bounded writer buffers plus vectors.

##### Domain and gaps

No network/DNS/download, real catalog/corpus/model/teacher or database execution. Effect paths are source-derived; finite helper tests are not universal verification. No executable percentage surrogate or speed claim; future caps require metric/domain/reference and remain 1/2/5/10%.