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ProbeLabs23 findings · 123 requirementsThe fastest JSON parser for Go — formally verified with ReqProof (real library, master).
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.
Specification
The requirement exactly as authored — its complete prose text and, where present, the formal FRETish sentence it compiles to.
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.
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.
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.
Verification & provenance
How this requirement was checked: the review trail, edit history, and the machine-analysis status terms (each ⓘ explains what it means).
Review
- Status
- approved
- Reviewer
- Buger · lead_engineer
- Reviewed
- Jul 26, 2026, 12:44 UTC
History
- Created
- Apr 14, 2026, 00:00 UTC · Created via CLI
- Modified
- Jul 26, 2026, 12:44 UTC · Buger
Change history
Every recorded revision of this requirement's source file — newest first, each with its commit message and the diff for that change.
Every recorded revision of this object's source — newest first, each with the commit message and its file-level diff.
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).
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
| Name | Type | Direction | Description |
|---|---|---|---|
| path_segment_is_array_index | — | True when the current lookup path segment is interpreted as an array index. | |
| array_index_segment_is_valid | — | True when the current array-index path segment has valid index syntax. | |
| array_index_is_in_bounds | — | True when the addressed array index is within the bounds of the addressed array. | |
| returns_value_from_in_bounds_array_index | — | True when Get resolves a valid in-bounds array-index path segment and returns the addressed element. |
Witnesses· 5 scenarios total
- TestMCDC_SYS_REQ_021_Row1_OutOfBoundsexercises 1 condition scenario
- TestMCDC_SYS_REQ_021_Row2_InvalidSegmentexercises 1 condition scenario
- TestMCDC_SYS_REQ_021_Row3_NotArraySegmentexercises 1 condition scenario
- TestMCDC_SYS_REQ_021_Row4_InvariantViolationexercises 1 condition scenario
- TestMCDC_SYS_REQ_021_Row5_InBoundsReturnedexercises 1 condition scenario
MC/DC truth table· 5 rows
Each row assigns the formula's conditions (T/F) and shows the Result— the formula's value for that input row, not a test pass/fail. A row proves a condition when flipping only that condition flips the outcome. The test that covers each row is linked.
mcdc:ignoreNo-actionfalse-result row satisfied by designUncoveredneeds a covering test| # | array_index_is_in_bounds | array_index_segment_is_valid | path_segment_is_array_index | returns_value_from_in_bounds_array_index | Result | Proves | Covering test |
|---|---|---|---|---|---|---|---|
| 1 | F | T | T | F | T | array_index_is_in_bounds | |
| 2 | T | F | T | F | T | array_index_segment_is_valid | |
| 3 | T | T | F | F | T | path_segment_is_array_index | |
| 4 | T | T | T | F | F | array_index_is_in_bounds | |
| 5 | T | T | T | T | T | returns_value_from_in_bounds_array_index |
Its place
This requirement shown inside its trace neighbourhood — the parents it satisfies, the code and tests attached to it, and its findings.
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Trace evidence
The concrete artifacts linked to this requirement — implementing code, verifying tests, documents, and the findings raised against it.
Impact
Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.
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
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
Parent requirements (1)
Discussions
Discuss this with the proof team. Nothing changes in your audit automatically — you open a request and a staff member records any outcome inside the thread.