---
title: "latex-print-stage1 — Mova code model"
description: "Mova code model of latex/src/print.rs: components with their labels, obernants and the model text."
url: "https://groupants.elamur.ai/free/en/mova/latex/src/print.rs.groupant/stage1.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-print-stage1

The groupant beside latex/src/print.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/src/print.rs`](https://github.com/ElamurAI/mova-free/blob/main/latex/src/print.rs)
- **source SHA-256:** `a6cb2d3ea7b54e4f…`
- **covers:** to_sexpr recursively writes tagged forms: Group, fraction kind, scripts with optional sub/sup/primes, environment row lists, unknown command/environment names with start offset. Text ignores TextStyle; Env serialization omits arg column metadata; XArrow prints above before optional below. (bytes 11368–15137)
- **part of:** [latex-print](https://md.groupants.elamur.ai/free/en/mova/latex/src/print.rs.groupant/)
- **repository folder:** [`latex/src/print.rs.groupant/stage1.groupant`](https://github.com/ElamurAI/mova-free/tree/main/latex/src/print.rs.groupant/stage1.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 | [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) |
| `debug_coordinate` | debug_coordinate | partial source derived model | [debug_coordinate](#debug-coordinate) |
| `label_order` | label_order | partial source derived model | [label_order](#label-order) |

## Model text


### descriptant

#### latex-print-stage1

to_sexpr recursively writes tagged forms: Group, fraction kind, scripts with optional sub/sup/primes, environment row lists, unknown command/environment names with start offset. Text ignores TextStyle; Env serialization omits arg column metadata; XArrow prints above before optional below.

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

to_sexpr recursively writes tagged forms: Group, fraction kind, scripts with optional sub/sup/primes, environment row lists, unknown command/environment names with start offset. Text ignores TextStyle; Env serialization omits arg column metadata; XArrow prints above before optional below.

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

### invariant

#### Scoped invariants

Debug output cannot recover full AST equality generally: different TextStyle variants and Env args can serialize identically. It is not parsed by the formula parser as a guaranteed inverse format.

Unknown start is printed with @; end is omitted. Therefore this view distinguishes some values that Node equality treats equal while collapsing other structural fields.

XArrow stored below/above prints above then below; Stack prints annotation then base through its tagged parts. Consumers must use these explicit orders rather than assume field declaration order.

### composition

#### Scoped interaction

This debugging view is separate from canonical LaTeX and plain text. Neither gate equality nor canonical idempotence uses it as a serialization contract.

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

Debug output cannot recover full AST equality generally: different TextStyle variants and Env args can serialize identically. It is not parsed by the formula parser as a guaranteed inverse format.

### reverse_reconstruction

Text(Plain,'a') and Text(Bf,'a') share the text debug form. Two Env nodes differing only array column arg share output. Unknown spans with equal start but different end also share output.

### debug_coordinate

Unknown start is printed with @; end is omitted. Therefore this view distinguishes some values that Node equality treats equal while collapsing other structural fields.

### label_order

XArrow stored below/above prints above then below; Stack prints annotation then base through its tagged parts. Consumers must use these explicit orders rather than assume field declaration order.

### tests

#### Evidence — 2026-10-31

print::tests::canonical_latex; print::tests::plain_text; integration golden outputs and corrupted_printer_turns_gate_red

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.