[INFO] fetching crate futex_channel 0.0.0...
[INFO] checking futex_channel-0.0.0 against try#ddfd70ee3c3748e597b32f416b0d15a4f6e37685 for pr-87050
[INFO] extracting crate futex_channel 0.0.0 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate futex_channel 0.0.0 on toolchain ddfd70ee3c3748e597b32f416b0d15a4f6e37685
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate futex_channel 0.0.0
[INFO] finished tweaking crates.io crate futex_channel 0.0.0
[INFO] tweaked toml for crates.io crate futex_channel 0.0.0 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded linux-futex v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9e6c58f7eaa7ca472318a9b7cf3def4984be03e403a62365605a9bcc04b19fbe
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "9e6c58f7eaa7ca472318a9b7cf3def4984be03e403a62365605a9bcc04b19fbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9e6c58f7eaa7ca472318a9b7cf3def4984be03e403a62365605a9bcc04b19fbe", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9e6c58f7eaa7ca472318a9b7cf3def4984be03e403a62365605a9bcc04b19fbe", kill_on_drop: false }`
[INFO] [stdout] 9e6c58f7eaa7ca472318a9b7cf3def4984be03e403a62365605a9bcc04b19fbe
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "-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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+ddfd70ee3c3748e597b32f416b0d15a4f6e37685" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ca70b99b274e537a910378c1739110affef30785f0542840b8157cdd4946a0e7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "ca70b99b274e537a910378c1739110affef30785f0542840b8157cdd4946a0e7", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.98
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking linux-futex v0.1.1
[INFO] [stderr]     Checking threadpool v1.8.1
[INFO] [stderr]     Checking futex_channel v0.0.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: associated function is never used: `push_front`
[INFO] [stdout]   --> src/inner.rs:65:19
[INFO] [stdout]    |
[INFO] [stdout] 65 |     pub(crate) fn push_front(&self, obj: T) -> AppendResult {
[INFO] [stdout]    |                   ^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.21s
[INFO] running `Command { std: "docker" "inspect" "ca70b99b274e537a910378c1739110affef30785f0542840b8157cdd4946a0e7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ca70b99b274e537a910378c1739110affef30785f0542840b8157cdd4946a0e7", kill_on_drop: false }`
[INFO] [stdout] ca70b99b274e537a910378c1739110affef30785f0542840b8157cdd4946a0e7