Sample
collection 1.19.1: Handle the TypeError thrown by CanonicalizedMap.cast at runtime due to incorrect delegation to the raw base map.
Verified sample for pub collection 1.19.1: Handle the TypeError thrown by CanonicalizedMap.cast at runtime due to incorrect delegation to the raw base map.…
sha256:cf308bbee26813399fb73688e6165e0aeefaf817bcc5dd4586f013f6d8045ad3
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 |
2026-08-16 |
| 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
- Handle the TypeError thrown by CanonicalizedMap.cast at runtime due to incorrect delegation to the raw base map.
- Packages
- Symbols
-
- CanonicalizedMap
- CanonicalizedMap.cast
- Environment
- dart
- Created
- 2026-08-17T02:04:15Z
Contract
- Calling cast on a CanonicalizedMap returns a map view that throws a TypeError on value retrieval, because it delegates to the underlying map containing MapEntry elements instead of unpacking them.
- Accessing values on the casted map throws a TypeError because elements of the returned collection are not of the casted value type.
- Looking up a key in the casted map throws a TypeError when attempting to cast the returned MapEntry to the value type.
- Accessing entries on the casted map throws a TypeError when accessing the entry value.
Files
- NOTES.md
- csx.json
- pubspec.lock
- pubspec.yaml
- test/contract.dart