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

This page as HTML: <https://groupants.elamur.ai/free/en/mova/tools/topic-corpus/src/hardcases.rs.groupant/>

# mova-topic-corpus-hardcases

The groupant beside tools/topic-corpus/src/hardcases.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:** [`tools/topic-corpus/src/hardcases.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/topic-corpus/src/hardcases.rs)
- **source SHA-256:** `6473041bb6bb2223…`
- **repository folder:** [`tools/topic-corpus/src/hardcases.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/topic-corpus/src/hardcases.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 | [Forward approximant](#forward-approximant) |
| **ast** | partial | `syntax.json` |
| **composition** | partial | [Composition](#composition) |
| **cost** | partial | [Cost](#cost) |
| **descriptant** | present | [Descriptant](#descriptant) |
| **invariant** | partial | [Invariant](#invariant) |
| **tests** | finite evidence | `tests.md` |

## 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) |

## Model text


### Descriptant

The topic corpora's side of the one shared hard-cases list (`mova-hard-case-list`, format mova-hard-case-v2, the same file as the Wikipedia corpus's cases): judges a parse (no words, a tree without exactly one root, a head outside the sentence, no frame for six words or more), records found sentences with the document's licence and a pointer to the document, re-judges only its own open cases, and writes a parsed document as a mova-hard-bundle-v1 bundle for the Fish priority lane. Source: `tools/topic-corpus/src/hardcases.rs`.

### Forward approximant

issues(words, roots per tree, frames) -> reasons. record(found, licence, reader): build v2 Found records (source topic-corpus, id <doc>:<s>, document {doc, s}) -> hard_case_list::record for parser en. recheck: hard_case_list::recheck(source = topic-corpus, parser en) with the sentence check. bundle(corpus, doc, sentences) -> JSON with each sentence's CoNLL-U (forms, lemmas, UPOS, heads, relations; XPOS/FEATS unknown) and empty pragmatics rows.

### Invariant

A key is open from its first found until a learned event; found again after learned reopens it; appends are flocked and fsynced.

### Cost

O(list) per record/recheck (the whole file is read); bundle O(sentences).

### Composition

Parent: `topic-corpus`.

### behavior_complement

Does not delete cases, does not decide what the parser learns, never learns a case another source found (source-scoped recheck, tested). Evidence status: source-derived model with finite checks, not a proof.

### reverse_reconstruction

The list keeps text, place and reasons of each case; the parse that failed is not kept. No unique inverse is claimed.

### tests.md


hardcases::tests::found_once_open_until_learned (v2 records with licence and document pointer; red control: another source's case is not rechecked; bundle CoNLL-U shape). Live 2026-11-04: 309 cases (all no_skeleton) from the hot neighbourhood of bryant-2017.

cargo test --manifest-path tools/topic-corpus/Cargo.toml --offline with WORLD_EN_MODEL=$MOVA_DATA/download/0/0.4/en.bin (18 unit tests; fixture library, fake `papers` binary, fake terminal, local Sea Spider store; two identical runs on 2026-11-04). Without the model the model-dependent tests report a skip.

Negative controls 2026-11-04 (each red, then restored): public admission without the origin condition; assert_public without the Sea Spider/draft/note refusals; seeding without the learner lock; shadow-library filter off; public citing that ignores refusals; cache eviction ignoring the hot pin.

These are finite fixtures and live samples; not a proof.

2026-11-04 (branch hard-loop): 17 of 18 pass; seed::tests::seeds_terms_from_neighbour_papers_and_respects_the_learner_lock fails on main as well (unrelated to this change).