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

# mova-hard-cases-main

The groupant beside tools/hard-cases/src/main.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/hard-cases/src/main.rs`](https://github.com/ElamurAI/mova-free/blob/main/tools/hard-cases/src/main.rs)
- **source SHA-256:** `1b67242492a85eea…`
- **repository folder:** [`tools/hard-cases/src/main.rs.groupant`](https://github.com/ElamurAI/mova-free/tree/main/tools/hard-cases/src/main.rs.groupant)
- **repository commit:** `48f2e6f74146`

> **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](#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) |

## Model text


### Descriptant

CLI of mova-hard-cases: list, wave, lane, guard, harvest, witness, eel, sample, measure, recheck, watch. Source: `tools/hard-cases/src/main.rs`.

### Forward approximant

args -> Config::load -> command -> pretty JSON on stdout or error with nonzero exit.

### Invariant

Every command reads one configuration; no command starts a teacher call (wave, harvest and judge read and write files; eel runs the engine once; guard and watch loop until STOP).

### Cost

That of the chosen command.

### Composition

Binary entry; parent hard-cases.

### behavior_complement

No shell, no arbitrary executable arguments: executables come from the pinned configuration. Evidence status: source-derived model with finite checks, not a proof.

### reverse_reconstruction

The printed JSON is the command's report; inputs are recoverable from the configuration and lane files.

### Tests

cargo test --manifest-path tools/hard-cases/Cargo.toml --offline (2026-11-04: 9 unit tests, two identical runs) Finite fixtures and live samples; not a proof.