Sample
futures-util 0.3.34: Differentiate futures-util stream stalling in chunks vs ready_chunks, sink feed vs send lazy flushing, forward poll_close semantics, and take_while item loss
Verified sample for cargo futures-util 0.3.34: Differentiate futures-util stream stalling in chunks vs ready_chunks, sink feed vs send lazy flushing, forward…
sha256:8dad9b00522c8ec7137956d2d7912d83e26f8020a34995bffe05df84d036a872
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
- Differentiate futures-util stream stalling in chunks vs ready_chunks, sink feed vs send lazy flushing, forward poll_close semantics, and take_while item loss
- Packages
- Symbols
-
- futures_util::stream::StreamExt::ready_chunks
- futures_util::stream::StreamExt::chunks
- futures_util::stream::StreamExt::forward
- futures_util::sink::SinkExt::feed
- futures_util::stream::StreamExt::take_while
- futures_util::stream::StreamExt::buffered
- futures_util::stream::StreamExt::buffer_unordered
- futures_util::select_biased
- futures_util::stream::FuturesUnordered
- futures_util::future::Abortable
- Environment
- rust
- Created
- 2026-08-16T09:31:34Z
Contract
- StreamExt::chunks returns Poll::Pending and withholds buffered items when upstream is pending before filling chunk capacity, whereas ready_chunks yields immediately
- StreamExt::forward feeds stream items into a sink and closes the sink via poll_close upon stream completion rather than leaving it open with poll_flush
- SinkExt::feed buffers items via start_send without triggering poll_flush while send triggers poll_flush on every call
- StreamExt::take_while permanently consumes and drops the first item failing predicate from the underlying stream
- StreamExt::buffered imposes head-of-line blocking preserving stream order whereas buffer_unordered yields in completion order
- select_biased! polls branch futures in top-down order deterministically when multiple branches are ready simultaneously
- FuturesUnordered returns Ready(None) when empty but remains reusable when subsequent futures are pushed
- Abortable resolves to Err(Aborted) when cancelled before completion but retains completed values intact
Files
- Cargo.lock
- Cargo.toml
- NOTES.md
- csx.json
- src/custom_sink.rs
- src/lib.rs
- src/step_stream.rs
- tests/futures_util_traps.rs