[INFO] fetching crate fb_futures_01_ext 0.1.0...
[INFO] checking fb_futures_01_ext-0.1.0 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate fb_futures_01_ext 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] started tweaking crates.io crate fb_futures_01_ext 0.1.0
[INFO] finished tweaking crates.io crate fb_futures_01_ext 0.1.0
[INFO] tweaked toml for crates.io crate fb_futures_01_ext 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate fb_futures_01_ext 0.1.0 on toolchain 4f260f0f20b3133d20cfb50353c0221943af5796
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]      Locking 69 packages to latest compatible versions
[INFO] [stderr]       Adding bytes v0.4.12 (available: v1.10.1)
[INFO] [stderr]       Adding futures v0.1.31 (available: v0.3.31)
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] f4d770c49b8ab0832f02d131e4a1e8b8d79aa192f680cae0050f96aced079921
[INFO] running `Command { std: "docker" "start" "-a" "f4d770c49b8ab0832f02d131e4a1e8b8d79aa192f680cae0050f96aced079921", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "f4d770c49b8ab0832f02d131e4a1e8b8d79aa192f680cae0050f96aced079921", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f4d770c49b8ab0832f02d131e4a1e8b8d79aa192f680cae0050f96aced079921", kill_on_drop: false }`
[INFO] [stdout] f4d770c49b8ab0832f02d131e4a1e8b8d79aa192f680cae0050f96aced079921
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid -Dunmustuse_in_always_ok" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:4848fb76d95f26979359cc7e45710b1dbc8f3acb7aeedee7c460d7702230f228" "/opt/rustwide/cargo-home/bin/cargo" "+4f260f0f20b3133d20cfb50353c0221943af5796" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8d7ad711554f1268083fcd901256d4298683db97771db1351b7087b773d16ec6
[INFO] running `Command { std: "docker" "start" "-a" "8d7ad711554f1268083fcd901256d4298683db97771db1351b7087b773d16ec6", kill_on_drop: false }`
[INFO] [stderr]     Checking futures v0.1.31
[INFO] [stderr]     Checking regex-automata v0.4.13
[INFO] [stderr]     Checking iovec v0.1.4
[INFO] [stderr]    Compiling futures-macro v0.3.31
[INFO] [stderr]     Checking rand_core v0.6.4
[INFO] [stderr]     Checking tokio v1.48.0
[INFO] [stderr]     Checking fb_cloned v0.1.3
[INFO] [stderr]     Checking assert_matches v1.5.0
[INFO] [stderr]     Checking bytes v0.4.12
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking futures-util v0.3.31
[INFO] [stderr]     Checking tokio-io v0.1.13
[INFO] [stderr]     Checking fb_futures_01_ext v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:44:52
[INFO] [stdout]    |
[INFO] [stdout] 44 |       fn poll(&mut self) -> Poll<Option<S::Item>, !> {
[INFO] [stdout]    |  ____________________________________________________^
[INFO] [stdout] 45 | |         match self.inner.poll() {
[INFO] [stdout] 46 | |             Ok(Async::Ready(v)) => Ok(Async::Ready(v)),
[INFO] [stdout] 47 | |             Ok(Async::NotReady) => Ok(Async::NotReady),
[INFO] [stdout] ...  |
[INFO] [stdout] 55 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout]    |
[INFO] [stdout]    = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:45:9
[INFO] [stdout]    |
[INFO] [stdout] 45 | /         match self.inner.poll() {
[INFO] [stdout] 46 | |             Ok(Async::Ready(v)) => Ok(Async::Ready(v)),
[INFO] [stdout] 47 | |             Ok(Async::NotReady) => Ok(Async::NotReady),
[INFO] [stdout] 48 | |             Err(err) => {
[INFO] [stdout] ...  |
[INFO] [stdout] 54 | |         }
[INFO] [stdout]    | |_________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:46:36
[INFO] [stdout]    |
[INFO] [stdout] 46 |             Ok(Async::Ready(v)) => Ok(Async::Ready(v)),
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:47:36
[INFO] [stdout]    |
[INFO] [stdout] 47 |             Ok(Async::NotReady) => Ok(Async::NotReady),
[INFO] [stdout]    |                                    ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:48:25
[INFO] [stdout]    |
[INFO] [stdout] 48 |               Err(err) => {
[INFO] [stdout]    |  _________________________^
[INFO] [stdout] 49 | |                 self.err_tx.take().map(|tx| tx.send(err));
[INFO] [stdout] ...  |
[INFO] [stdout] 53 | |             }
[INFO] [stdout]    | |_____________^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: Result<futures::Async<Option<<S as futures::Stream>::Item>>, !>
[INFO] [stdout]   --> src/split_err.rs:52:17
[INFO] [stdout]    |
[INFO] [stdout] 52 |                 Ok(Async::NotReady)
[INFO] [stdout]    |                 ^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `fb_futures_01_ext` (lib) due to 6 previous errors
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] running `Command { std: "docker" "inspect" "8d7ad711554f1268083fcd901256d4298683db97771db1351b7087b773d16ec6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8d7ad711554f1268083fcd901256d4298683db97771db1351b7087b773d16ec6", kill_on_drop: false }`
[INFO] [stdout] 8d7ad711554f1268083fcd901256d4298683db97771db1351b7087b773d16ec6