Sample
tokio 1.53.1: Calling try_recv on a closed Tokio MPSC receiver with in-flight sender permits returns Empty instead of premature Disconnected
Verified sample for cargo tokio 1.53.1: Calling try_recv on a closed Tokio MPSC receiver with in-flight sender permits returns Empty instead of premature…
sha256:1ff6e5d349fd30f10ae07ff7eecbcd551ea33279ba3e1ed6b5e2a0c68f4b72d6
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 |
2026-08-16 |
| 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
- Calling try_recv on a closed Tokio MPSC receiver with in-flight sender permits returns Empty instead of premature Disconnected
- Packages
- Symbols
-
- tokio::sync::mpsc::Receiver::try_recv
- tokio::sync::mpsc::Sender::try_reserve
- tokio::sync::mpsc::Permit::send
- tokio::sync::mpsc::Receiver::close
- Environment
- rust
- Created
- 2026-08-16T06:43:32Z
Contract
- mpsc::Receiver::close on an empty channel does not immediately disconnect while sender permits are in flight
- mpsc::Receiver::try_recv returns Err(TryRecvError::Empty) when closed with outstanding sender permits
- mpsc::Permit::send successfully delivers payload through closed channel
- mpsc::Receiver::try_recv returns Ok(payload) to drain the permit-delivered message
- mpsc::Receiver::try_recv returns Err(TryRecvError::Disconnected) only after all permits and messages are exhausted
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs