[INFO] fetching crate simple-cmd 0.0.22...
[INFO] checking simple-cmd-0.0.22 against try#4f260f0f20b3133d20cfb50353c0221943af5796+rustflags=-Dunmustuse_in_always_ok for pr-148577
[INFO] extracting crate simple-cmd 0.0.22 into /workspace/builds/worker-2-tc2/source
[INFO] started tweaking crates.io crate simple-cmd 0.0.22
[INFO] finished tweaking crates.io crate simple-cmd 0.0.22
[INFO] tweaked toml for crates.io crate simple-cmd 0.0.22 written to /workspace/builds/worker-2-tc2/source/Cargo.toml
[INFO] validating manifest of crates.io crate simple-cmd 0.0.22 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] crate crates.io crate simple-cmd 0.0.22 already has a lockfile, it will not be regenerated
[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-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 42e8a0f2c1c7fc056637f4c0ed4e30422da6bf5d4b71cc8c33c5ea8c95fe7573
[INFO] running `Command { std: "docker" "start" "-a" "42e8a0f2c1c7fc056637f4c0ed4e30422da6bf5d4b71cc8c33c5ea8c95fe7573", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "42e8a0f2c1c7fc056637f4c0ed4e30422da6bf5d4b71cc8c33c5ea8c95fe7573", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "42e8a0f2c1c7fc056637f4c0ed4e30422da6bf5d4b71cc8c33c5ea8c95fe7573", kill_on_drop: false }`
[INFO] [stdout] 42e8a0f2c1c7fc056637f4c0ed4e30422da6bf5d4b71cc8c33c5ea8c95fe7573
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2-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] 31bc1d746915002e70a28c006c62754fa58a0368e4499571e343ed1c337c145c
[INFO] running `Command { std: "docker" "start" "-a" "31bc1d746915002e70a28c006c62754fa58a0368e4499571e343ed1c337c145c", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.170
[INFO] [stderr]     Checking log v0.4.26
[INFO] [stderr]     Checking tracing-core v0.1.33
[INFO] [stderr]    Compiling nix v0.29.0
[INFO] [stderr]    Compiling time-macros v0.2.19
[INFO] [stderr]     Checking deranged v0.3.11
[INFO] [stderr]     Checking time-core v0.1.2
[INFO] [stderr]     Checking thread_local v1.1.8
[INFO] [stderr]     Checking smallvec v1.14.0
[INFO] [stderr]    Compiling quote v1.0.39
[INFO] [stderr]     Checking crossbeam-queue v0.3.12
[INFO] [stderr]     Checking crossbeam-channel v0.5.14
[INFO] [stderr]     Checking crossbeam-deque v0.8.6
[INFO] [stderr]     Checking tracing-log v0.2.0
[INFO] [stderr]     Checking tracing-subscriber v0.3.19
[INFO] [stderr]    Compiling syn v2.0.99
[INFO] [stderr]     Checking crossbeam v0.8.4
[INFO] [stderr]     Checking signal-hook-registry v1.4.2
[INFO] [stderr]     Checking time v0.3.37
[INFO] [stderr]     Checking num_cpus v1.16.0
[INFO] [stderr]     Checking signal-hook v0.3.17
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking simple_logger v5.0.0
[INFO] [stderr]     Checking ctrlc v3.4.5
[INFO] [stderr]    Compiling tracing-attributes v0.1.28
[INFO] [stderr]    Compiling thiserror-impl v2.0.12
[INFO] [stderr]     Checking thiserror v2.0.12
[INFO] [stderr]     Checking tracing v0.1.41
[INFO] [stderr]     Checking simple-cmd v0.0.22 (/opt/rustwide/workdir)
[INFO] [stdout] warning: trait `OutputResult` is never used
[INFO] [stdout]   --> src/lib.rs:55:18
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub(crate) trait OutputResult {
[INFO] [stdout]    |                  ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<Stdio, Infallible>
[INFO] [stdout]    --> src/impls.rs:394:19
[INFO] [stdout]     |
[INFO] [stdout] 394 |         let fd: Stdio = child1_stdout.try_into().unwrap();
[INFO] [stdout]     |                         ^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: requested on the command line with `-D unmustuse-in-always-ok`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `simple-cmd` (lib) due to 1 previous error; 1 warning emitted
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: trait `OutputResult` is never used
[INFO] [stdout]   --> src/lib.rs:55:18
[INFO] [stdout]    |
[INFO] [stdout] 55 | pub(crate) trait OutputResult {
[INFO] [stdout]    |                  ^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<Stdio, Infallible>
[INFO] [stdout]    --> src/impls.rs:394:19
[INFO] [stdout]     |
[INFO] [stdout] 394 |         let fd: Stdio = child1_stdout.try_into().unwrap();
[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: std::result::Result<crossbeam_channel::Receiver<()>, Infallible>
[INFO] [stdout]   --> src/test.rs:47:77
[INFO] [stdout]    |
[INFO] [stdout] 47 |       fn cancel_signal(timeout: Duration) -> Result<Receiver<()>, Infallible> {
[INFO] [stdout]    |  _____________________________________________________________________________^
[INFO] [stdout] 48 | |         let (s, r) = bounded(1);
[INFO] [stdout] 49 | |         thread::spawn(move || {
[INFO] [stdout] 50 | |             sleep(timeout);
[INFO] [stdout] ...  |
[INFO] [stdout] 55 | |         Ok(r)
[INFO] [stdout] 56 | |     }
[INFO] [stdout]    | |_____^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<crossbeam_channel::Receiver<()>, Infallible>
[INFO] [stdout]   --> src/test.rs:55:9
[INFO] [stdout]    |
[INFO] [stdout] 55 |         Ok(r)
[INFO] [stdout]    |         ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: this type will no longer be must used: std::result::Result<crossbeam_channel::Receiver<()>, Infallible>
[INFO] [stdout]    --> src/test.rs:163:29
[INFO] [stdout]     |
[INFO] [stdout] 163 |         let cancel_signal = cancel_signal(Duration::from_secs(1)).unwrap();
[INFO] [stdout]     |                             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not compile `simple-cmd` (lib test) due to 4 previous errors; 1 warning emitted
[INFO] running `Command { std: "docker" "inspect" "31bc1d746915002e70a28c006c62754fa58a0368e4499571e343ed1c337c145c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "31bc1d746915002e70a28c006c62754fa58a0368e4499571e343ed1c337c145c", kill_on_drop: false }`
[INFO] [stdout] 31bc1d746915002e70a28c006c62754fa58a0368e4499571e343ed1c337c145c