---
title: "latex-build-stage0 — Mova code model"
description: "Mova code model of latex/build.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/latex/build.rs.groupant/stage0.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**

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# latex-build-stage0

The groupant beside latex/build.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:** [`latex/build.rs`](https://github.com/ElamurAI/mova-free/blob/main/latex/build.rs)
- **source SHA-256:** `39a1feed1af329d1…`
- **covers:** is_ident(s) = first(s).is_ascii_uppercase() AND every remaining scalar is_ascii_alphanumeric(). Empty has no first scalar and returns false. (bytes 2715–2877)
- **part of:** [latex-build](https://md.groupants.elamur.ai/free/en/mova/latex/build.rs.groupant/)
- **repository folder:** [`latex/build.rs.groupant/stage0.groupant`](https://github.com/ElamurAI/mova-free/tree/main/latex/build.rs.groupant/stage0.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` |
| **composition** | partial | [composition](#composition) |
| **descriptant** | present | [descriptant](#descriptant) |
| **invariant** | partial | [invariant](#invariant) |
| **tests** | executed 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) |
| `identifier_language` | identifier_language | partial source derived model | [identifier_language](#identifier-language) |
| `validation_order` | validation_order | partial source derived model | [validation_order](#validation-order) |

## Model text


### descriptant

#### latex-build-stage0

is_ident(s) = first(s).is_ascii_uppercase() AND every remaining scalar is_ascii_alphanumeric(). Empty has no first scalar and returns false.

Epoch 2026-10-31: replaced stage topic lists with concrete transitions, exclusions and compatible antecedents. Four meaningful typed views replace the previous six-view bookkeeping catalog. Shared syntax and source byte bounds are unchanged.

### approximant

#### Scoped forward relation

is_ident(s) = first(s).is_ascii_uppercase() AND every remaining scalar is_ascii_alphanumeric(). Empty has no first scalar and returns false.

This is an exact source-derived partial model, not an executable approximate replacement.

### invariant

#### Scoped invariants

Outputs true for empty, lowercase-leading, non-ASCII or underscore-containing names are excluded. This predicate has no file writes or table mutation.

The accepted language excludes ordinary Rust identifiers such as Alpha_beta; it is the generator's stricter variant convention.

main calls this predicate before symbol uniqueness/class/form validation. Its false result triggers that caller's identifier assertion; the predicate itself does not panic on empty input.

### composition

#### Scoped interaction

Build validation consumes this boolean for sym and other enum row IDs; lexical acceptance does not prove a generated enum is complete.

The manifest binds this stage to the unchanged parent syntax projection and exact source byte range. Parent cost remains an upper accounting context; no independent whole-file invocation or execution count is assigned to this fragment.

### models

### behavior_complement

Outputs true for empty, lowercase-leading, non-ASCII or underscore-containing names are excluded. This predicate has no file writes or table mutation.

### reverse_reconstruction

Preimage(true) is [A-Z][A-Za-z0-9]*; preimage(false) is every other UTF-8 string. A and Z9 share true, so the bool cannot reconstruct spelling.

### identifier_language

The accepted language excludes ordinary Rust identifiers such as Alpha_beta; it is the generator's stricter variant convention.

### validation_order

main calls this predicate before symbol uniqueness/class/form validation. Its false result triggers that caller's identifier assertion; the predicate itself does not panic on empty input.

### tests

#### Evidence — 2026-10-31

wave28_tests::canonical_first_form_and_variant_order; wave28_tests::variant_identifier_boundary

Selected library filters ast:: lex:: macros:: parse:: print:: table:: and integration gate excluding document_extraction_with_preamble_macros and random_token_soup_never_panics_and_roundtrips. Direct rustc --test latex/build.rs exercises private helpers. All selected tests twice debug/release with identical sorted names. Four compiled mutants at build/AST/parser/printer boundaries fail assertions then exact restoration passes. These do not individually cover every source. Build-main failure effects, allocation failures and universal roundtrip are unproved. Strict Clippy reports existing lints. No corpus/live VMM/API/GPU/full-school/held-out tests.