Sample
futures-util 0.3.34: Handle stream unfold return tuple ordering, buffer_unordered and buffered concurrency and deadlock traps, ready_chunks batching, select loser preservation, and try_join_all cancellation
Verified sample for cargo futures-util 0.3.34: Handle stream unfold return tuple ordering, buffer_unordered and buffered concurrency and deadlock traps…
sha256:d6d1ba895636c28d95e369bf0c9d1d6907c4fe9f6602510ca5ca39c7444d2304
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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
- Handle stream unfold return tuple ordering, buffer_unordered and buffered concurrency and deadlock traps, ready_chunks batching, select loser preservation, and try_join_all cancellation
- Packages
- Symbols
-
- futures_util::stream::unfold
- futures_util::stream::StreamExt::buffer_unordered
- futures_util::stream::StreamExt::buffered
- futures_util::stream::StreamExt::ready_chunks
- futures_util::stream::StreamExt::chunks
- futures_util::future::select
- futures_util::future::try_join_all
- Environment
- rust
- Created
- 2026-08-16T09:35:23Z
Contract
- assert stream::unfold closure returns Option<(Item, NextState)> where the yielded stream item is the first tuple element and the next generator state is the second tuple element
- assert stream::unfold with identical item and state types silently inverts stream output and state transitions if written in accumulator-first order
- assert buffered and buffer_unordered operate on a stream of Futures rather than raw items with a closure
- assert buffered stalls yield when the head future is pending despite subsequent buffered futures completing while buffer_unordered yields out-of-order completions eagerly
- assert buffer_unordered with zero concurrency limit deadlocks without pulling any futures from the upstream stream
- assert chunks blocks until the requested batch size is reached while ready_chunks eagerly yields immediately available items without returning Pending
- assert future::select returns Either pairing the completed output with the uncompleted losing future by value to prevent accidental drop
- assert try_join_all immediately returns the first Err encountered and aborts remaining in-flight futures by dropping them
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs