Elamur Groupantsmlab-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
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 |
| ast | partial | ../syntax.json |
| cost | symbolic source derived | invariant |
| descriptant | present | descriptant |
| invariant | partial | invariant |
| tests | executed bounded checks | 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 |
arity_order | arity_order | partial source derived model | arity_order |
depth_budget | depth_budget | partial source derived model | depth_budget |
capture_projection | capture_projection | partial source derived model | capture_projection |
output_projection | output_projection | partial source derived model | 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.
This page in Markdown → https://md.groupants.elamur.ai/free/en/mova/mlab/src/interp.rs.groupant/calls.groupant/