Elamur Groupantsmova-hard-cases-lib
The groupant beside tools/hard-cases/src/lib.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
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 |
| ast | partial | syntax.json |
| composition | partial | Composition |
| cost | partial | Cost |
| descriptant | present | Descriptant |
| invariant | partial | Invariant |
| tests | finite evidence | 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 |
reverse_reconstruction | reverse_reconstruction | partial source derived model | reverse_reconstruction |
Model text
Descriptant
Crate root of mova-hard-cases: module map of the loop from reading failures to learning and shared helpers (SHA-256, atomic/exclusive writes, CoNLL-U block helpers, normalized-text hash, lane document ids hard:<16 hex>). Source: tools/hard-cases/src/lib.rs.
Forward approximant
doc_id(source, document) = 'hard:' + first16(sha256(source NUL document)); norm_sha(t) = sha256(join(' ', whitespace-split t)); blocks(conllu) = trimmed nonempty blocks each ending in one LF; with_id replaces the sent_id line.
Invariant
Pure helpers except write_atomic (temp + fsync + rename) and write_new (create_new, refuses to overwrite).
Cost
Linear in input bytes.
Composition
Parent of the hard-cases modules; group hard-cases.
behavior_complement
Holds no policy and calls no process. Evidence status: source-derived model with finite checks, not a proof.
reverse_reconstruction
doc_id is a one-way hash: the document id is recovered from the wave's selection, not from the id.
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.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/tools/hard-cases/src/lib.rs.groupant/