Elamur Groupantsmlab-interp-run-state
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 |
parse_barrier | parse_barrier | partial source derived model | parse_barrier |
termination_class | termination_class | partial source derived model | termination_class |
dispatch_relation | dispatch_relation | partial source derived model | dispatch_relation |
state_effect | state_effect | partial source derived model | state_effect |
Model text
descriptant
mlab-interp-run-state
Parse/register/execute entry boundary only.
Epoch 2026-10-31
Half-open source bytes [6365,7324); bound by parent source hash and scoped byte hash. Model covers only this fragment; parent composition explains joins.
approximant
Scoped forward relation
parse error -> diagnostic,false without registering or executing; successful parse -> install functions -> VM/tree -> bool and error stream.
Domain and gap
Source-generated states within resource limits. Categorical relation has no executable percent surrogate.
invariant
Scoped invariant
x=8 followed by incomplete parenthesis cannot overwrite existing x=7.
Cost
Parsing before execution adds source/AST storage; execution cost delegated to selected engine. Error emission is proportional to diagnostic bytes.
models
Scoped typed relations
behavior_complement
Parse error excludes registration and prefix execution; runtime error excludes remaining statements but does not exclude prefix writes.
reverse_reconstruction
false with parser diagnostic admits many malformed texts and unchanged workspaces; false with runtime diagnostic admits prefix effects.
parse_barrier
x=8 followed by incomplete parenthesis cannot overwrite existing x=7.
termination_class
Return, Break and Continue at top level map to true; Flow::Err maps to false.
dispatch_relation
vm_mode selects vm::run_program after registering functions.
state_effect
Runtime error updates last_error and retains prior workspace writes.
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/run-state.groupant/