Sample
tower-layer 0.3.3: Show that `tower-layer` reference-based stacking can share hidden mutable state across wraps.
Verified sample for cargo tower-layer 0.3.3: Show that `tower-layer` reference-based stacking can share hidden mutable state across wraps. The contract ran…
sha256:67aad743bfcda22dbbef71bd3cc7a9cbf0de2d864ae984e0560355f976360ace
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
rust linux x64 rust rust cargo
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| rust 1 · linux alpine/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-17 |
| rust 1 · linux alpine/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · cargo@1 |
2026-08-18 |
Case
HOW- Goal
- Show that `tower-layer` reference-based stacking can share hidden mutable state across wraps.
- Packages
- Symbols
-
- tower_layer::Layer
- Environment
- rust
- Created
- 2026-08-17T01:08:09Z
Contract
- assert that the same borrowed layer can be used for multiple `Layer::layer` calls and the call count is cumulative
- assert that wrapped services reflect distinct build IDs because the shared reference updates shared state
- assert that this shared mutable behavior is observable even though the trait method takes `&self`
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs