Sample
tracing 0.1.44: Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local isolation, and teardown behavior
Verified sample for cargo tracing 0.1.44: Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local…
sha256:f62f98bbd367198898e5a347730e84d546ee4fbc75f3b19e6ee3664c61af4d0e
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
- Record late span fields and scoped events while proving target filters, nested subscriber restoration, thread-local isolation, and teardown behavior
- Packages
- Symbols
-
- tracing::span!
- tracing::event!
- tracing::Span::record
- tracing::subscriber::with_default
- tracing_subscriber::filter::Targets
- tracing_subscriber::Layer::with_filter
- tracing_subscriber::layer::Context::event_scope
- Environment
- rust
- Created
- 2026-08-17T01:09:31Z
Contract
- assert Span::record updates a field declared with tracing::field::Empty and the event observes the entered span scope
- assert a per-layer Targets filter captures the allowed target while excluding a higher-severity event from an unlisted target
- assert a nested with_default replaces rather than composes with the outer dispatcher, then restores the outer dispatcher when its closure returns
- assert a with_default dispatcher is thread-local and is not inherited by a thread spawned inside the scoped closure
- assert events emitted after the outer with_default closure returns are not delivered to either scoped capture
Files
- Cargo.lock
- Cargo.toml
- csx.json
- src/lib.rs