Sample
args 2.7.0: Prove how package:args caches and shares mutable default list instances across parses for unprovided multi-options
Verified sample for pub args 2.7.0: Prove how package:args caches and shares mutable default list instances across parses for unprovided multi-options. The…
sha256:09efd7ba07568bb8934ab71bd5cda6503408067f4a024fd6365b7cf744124ce2
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
dart linux x64 dart dart pub
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| dart 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-17 |
| dart 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · pub@1 |
2026-08-18 |
Case
HOW- Goal
- Prove how package:args caches and shares mutable default list instances across parses for unprovided multi-options
- Packages
- Symbols
-
- ArgParser
- ArgParser.addMultiOption
- ArgResults
- ArgResults.multiOption
- ArgResults.arguments
- ArgResults.rest
- Environment
- dart
- Created
- 2026-08-17T06:45:46Z
Contract
- ArgResults.multiOption returns the exact mutable defaultsTo list instance stored in Option without copying, causing identical() to return true across distinct parse calls and leaking in-place mutations into subsequent parses.
- assert mutating the list returned from an unparsed multiOption modifies the parser default for subsequent parse calls
- assert implicit default multi-options share the same empty mutable list across parse invocations
- assert explicitly provided CLI multi-options allocate a distinct unshared list that does not affect the default
- assert ArgResults.arguments and ArgResults.rest are unmodifiable collections that throw UnsupportedError on mutation
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart