Sample
futures-util 0.3.34: Polling an empty FuturesUnordered returns None without terminating the collection so new futures can be pushed and polled dynamically, whereas wrapping it in Fuse permanently latches is_terminated on the first None and ignores subsequent pushed tasks
Verified sample for cargo futures-util 0.3.34: Polling an empty FuturesUnordered returns None without terminating the collection so new futures can be pushed…
sha256:2336755e4371002b1fe77659a664fa05c66c674b78f48b4f45d6cad20aa9c8f0
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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
- Polling an empty FuturesUnordered returns None without terminating the collection so new futures can be pushed and polled dynamically, whereas wrapping it in Fuse permanently latches is_terminated on the first None and ignores subsequent pushed tasks
- Packages
- Symbols
-
- futures_util::stream::FuturesUnordered
- futures_util::stream::StreamExt
- futures_util::sink::SinkExt
- futures_util::sink::Sink
- Environment
- rust
- Created
- 2026-08-16T09:35:31Z
Contract
- assert polling an empty FuturesUnordered returns Ready(None) without preventing subsequent push calls from yielding new items on future polls
- assert wrapping FuturesUnordered in Fuse permanently latches is_terminated on the first None and returns Ready(None) forever even when new items are pushed to the inner queue
- assert buffer_unordered with zero capacity returns Poll::Pending unconditionally without draining available items from the upstream stream
- assert polling select_next_some on an already terminated fused stream panics at runtime while next returns Ready(None)
- assert ready_chunks yields all currently available elements immediately in a single poll batch without waiting for the full capacity buffer or stream EOF
- assert SplitSink::reunite only succeeds when paired with the SplitStream from the same split invocation and fails on cross-split pairs
- assert stream select exhausts both constituent streams completely before returning Ready(None)
Files
- .gitignore
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/lib.rs