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

The groupant beside mlab/src/interp.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:** [`mlab/src/interp.rs`](https://github.com/ElamurAI/mova-free/blob/main/mlab/src/interp.rs)
- **source SHA-256:** `5c4d879d116b5fa0…`
- **covers:** User/builtin/anonymous dispatch, argument arity and frame lifecycle. (bytes 31774–37102)
- **part of:** [mlab-interp](https://md.groupants.elamur.ai/free/en/mova/mlab/src/interp.rs.groupant/)
- **repository folder:** [`mlab/src/interp.rs.groupant/calls.groupant`](https://github.com/ElamurAI/mova-free/tree/main/mlab/src/interp.rs.groupant/calls.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` |
| **cost** | symbolic source derived | [invariant](#invariant) |
| **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) |
| `arity_order` | arity_order | partial source derived model | [arity_order](#arity-order) |
| `depth_budget` | depth_budget | partial source derived model | [depth_budget](#depth-budget) |
| `capture_projection` | capture_projection | partial source derived model | [capture_projection](#capture-projection) |
| `output_projection` | output_projection | partial source derived model | [output_projection](#output-projection) |

## Model text


### descriptant

#### mlab-interp-calls

User/builtin/anonymous dispatch, argument arity and frame lifecycle.

##### Epoch 2026-10-31

Half-open source bytes [31774,37102); bound by parent source hash and scoped byte hash. Model covers only this fragment; parent composition explains joins.

### approximant

#### Scoped forward relation

Named user wins builtin; builtin fault increments first numerical result; anonymous functions zip args to params over captured values; user frame executes then collects requested outputs.

##### Domain and gap

Source-generated states within resource limits. Categorical relation has no executable percent surrogate.

### invariant

#### Scoped invariant

Excess user inputs precede excess outputs, then depth.

##### Cost

Argument/capture cloning plus body/builtin costs; depth at most256 for admitted returned calls, with saved frames and pooled VM state. No total runtime bound.

### models

## Scoped typed relations

### behavior_complement

Excess inputs exclude entering a user frame; excessive outputs precede depth checks. User-name match excludes builtin execution. Anonymous capture excludes parameters from copied free variables.

### reverse_reconstruction

Output vector admits multiple functions and arguments; requested output count and definitions restrict the preimage but do not recover discarded locals.

### arity_order

Excess user inputs precede excess outputs, then depth.

### depth_budget

enter increments and rejects >256 while restoring count.

### capture_projection

Captured free values are creation-time snapshots; missing parameters remain undefined.

### output_projection

Collect at most max(nargout,1); missing required output errors, optional missing first output stops.


### tests

#### Evidence scope

Parent selected tests: wave30_parse_runtime_and_output_state, wave30_bounded_state_and_fallback, parse_error_runs_nothing. This fragment shares parent syntax and finite checks; no separate test count or complete fragment coverage claim. Assertion-control association and unexecuted paths are in parent tests.md and source-test-map.json.