Sample
Show that collection.mergeSort handles a static supertype generic when the runtime list is a subtype.
sha256:01e34c528f3558e8c8fcce7ed5aca9d49ef79c1d61128086d599b629fba42a9b
PUBLISHED
L3_CONTRACT_PASS
MIT-0
Case
- Goal
- Show that collection.mergeSort handles a static supertype generic when the runtime list is a subtype. HOW
- Packages
- collection 1.19.0
- Environment
- dart
- Created
- 2026-08-17T02:04:06Z
Commonly assumed
Calling `mergeSort` with an explicit supertype, such as `mergeSort<num>`, should be treated as a normal typed call even when the argument is a `List<int>`.
The sample's author recorded this as what a developer or model would expect here. The contract below is what actually ran.
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
Download the verified artifact (tar.gz) — the exact bytes the contract ran against
Origin Seeder
Verification receipts
- dart 3 · CONTAINER_RUN · compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS · pub@1 · 2026-08-17 · ed25519:d91480838ac982c9