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ProbeLabs36 findings · 123 requirements
SYS-REQ-021SystemApproved

When the current path segment is a valid in-bounds array index, Get shall resolve the addressed array element and return it through the normal successful lookup contract.

PriorityshallTypeguaranteeCategoryfunctionalComponentparserAssuranceBFindingsnone open

Specification

The requirement exactly as authored — its complete prose text and, where present, the formal FRETish sentence it compiles to.

Description

When the current path segment is a valid in-bounds array index, Get shall resolve the addressed array element and return it through the normal successful lookup contract.

FRETish formula
the parser shall always satisfy !path_segment_is_array_index | !array_index_segment_is_valid | !array_index_is_in_bounds | returns_value_from_in_bounds_array_index

Rationale & tags

Why this requirement exists, and how it is categorised.

Array index path segments are part of the documented public lookup contract and are behaviorally distinct from object-key segments.

decompositiongetarray-index

Verification & provenance

How this requirement was checked: the review trail, edit history, and the machine-analysis status terms (each ⓘ explains what it means).

Assurance levelB
Formalizationvalid
Realizabilityrealizable
Vacuitychecked_ok
Strategyfretish

Review

Status
approved
Reviewer
human:buger · lead_engineer
Reviewed
Jul 26, 2026, 12:44 UTC
Re-approved under L3 strict posture; content re-reviewed against current formalization

History

Created
Apr 14, 2026, 00:00 UTC · human:cli
Modified
Jul 26, 2026, 12:44 UTC · human:buger

Obligations

What this requirement must witness to be considered satisfied — the required evidence, and the tests that discharge each one.

No obligations recorded for this requirement

Proof obligations are recorded once evidence is generated. None have been captured here yet — this is expected, not a gap in the requirement itself. A required class of evidence the requirement must witness — the bridge between the requirement existing and it being proven.

Formula evidence

The formal formula behind this requirement, the variables it is written over, and the tests that exercise it (each term is explained inline).

FRETish formula

the parser shall always satisfy !path_segment_is_array_index | !array_index_segment_is_valid | !array_index_is_in_bounds | returns_value_from_in_bounds_array_index

Variables

NameTypeDirectionDescription
path_segment_is_array_indexTrue when the current lookup path segment is interpreted as an array index.
array_index_segment_is_validTrue when the current array-index path segment has valid index syntax.
array_index_is_in_boundsTrue when the addressed array index is within the bounds of the addressed array.
returns_value_from_in_bounds_array_indexTrue when Get resolves a valid in-bounds array-index path segment and returns the addressed element.

Witnesses· 5 scenarios total

  • TestGetArrayIndexInBounds
    deep_spec_test.go:1034
  • TestMCDC_SYS_REQ_021_Row1_OutOfBounds
    mcdc_spec_witnesses_test.go:603exercises 1 condition scenario
  • TestMCDC_SYS_REQ_021_Row2_InvalidSegment
    mcdc_spec_witnesses_test.go:612exercises 1 condition scenario
  • TestMCDC_SYS_REQ_021_Row3_NotArraySegment
    mcdc_spec_witnesses_test.go:621exercises 1 condition scenario
  • TestMCDC_SYS_REQ_021_Row4_InvariantViolation
    mcdc_spec_witnesses_test.go:636exercises 1 condition scenario
  • TestMCDC_SYS_REQ_021_Row5_InBoundsReturned
    mcdc_spec_witnesses_test.go:650exercises 1 condition scenario
  • TestGetRequirementSlices
    parser_test.go:1390

Its place

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Trace evidence

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Impact

Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.

If you change this

Requirements
0
Files
1
Tests
3
At-risk contracts
0

Files to re-check (1)

  • parser.goparser.go

Tests to re-run (3)

  • deep_spec_test.godeep_spec_test.go
  • mcdc_spec_witnesses_test.gomcdc_spec_witnesses_test.go
  • parser_test.goparser_test.go

What this rests on

Discussions

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