Sample
collection 1.19.0: Show that collection.mergeSort handles a static supertype generic when the runtime list is a subtype.
Verified sample for pub collection 1.19.0: Show that collection.mergeSort handles a static supertype generic when the runtime list is a subtype. The contract…
sha256:01e34c528f3558e8c8fcce7ed5aca9d49ef79c1d61128086d599b629fba42a9b
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
- Show that collection.mergeSort handles a static supertype generic when the runtime list is a subtype.
- Packages
- Symbols
-
- mergeSort
- Environment
- dart
- Created
- 2026-08-17T02:04:06Z
Contract
- `mergeSort<num>` on a `List<int>` completes without throwing and sorts the list in place.
- The resulting list is in non-decreasing order, proving the in-place merge sort completed correctly.
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart