[INFO] fetching crate max-7219-led-matrix-util 0.1.4...
[INFO] checking max-7219-led-matrix-util-0.1.4 against try#9cfe725f0995b018340c519db1b2f3cf8a7e0631 for pr-81174
[INFO] extracting crate max-7219-led-matrix-util 0.1.4 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate max-7219-led-matrix-util 0.1.4 on toolchain 9cfe725f0995b018340c519db1b2f3cf8a7e0631
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate max-7219-led-matrix-util 0.1.4
[INFO] finished tweaking crates.io crate max-7219-led-matrix-util 0.1.4
[INFO] tweaked toml for crates.io crate max-7219-led-matrix-util 0.1.4 written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate crates.io crate max-7219-led-matrix-util 0.1.4 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded gpio-cdev v0.3.0
[INFO] [stderr]   Downloaded max7219 v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 71e5ba9c66721d63cc48f39617c35e510aa2975dc17b573ff845f53abc6c9b51
[INFO] running `Command { std: "docker" "start" "-a" "71e5ba9c66721d63cc48f39617c35e510aa2975dc17b573ff845f53abc6c9b51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "71e5ba9c66721d63cc48f39617c35e510aa2975dc17b573ff845f53abc6c9b51", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "71e5ba9c66721d63cc48f39617c35e510aa2975dc17b573ff845f53abc6c9b51", kill_on_drop: false }`
[INFO] [stdout] 71e5ba9c66721d63cc48f39617c35e510aa2975dc17b573ff845f53abc6c9b51
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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" "rustops/crates-build-env@sha256:21f1ed92105a0ef9b0d27ad8bdeb7f36f9f01ac17fffe3a3f3dc5241fc25d8f4" "/opt/rustwide/cargo-home/bin/cargo" "+9cfe725f0995b018340c519db1b2f3cf8a7e0631" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ea8b3750d83c9e6f984e61a1835e51aa4233898c1152288b96a89a7f30e3c338
[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" "ea8b3750d83c9e6f984e61a1835e51aa4233898c1152288b96a89a7f30e3c338", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.72
[INFO] [stderr]     Checking nb v0.1.2
[INFO] [stderr]     Checking embedded-hal v0.2.4
[INFO] [stderr]     Checking max7219 v0.2.2
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking gpio-cdev v0.3.0
[INFO] [stderr]     Checking max-7219-led-matrix-util v0.1.4 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `remove_letter_spacing`
[INFO] [stdout]   --> src/lib.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn remove_letter_spacing(_moving_bits: &mut Vec<SingleDisplayData>) {
[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] [stdout] warning: function is never used: `remove_letter_spacing`
[INFO] [stdout]   --> src/lib.rs:96:4
[INFO] [stdout]    |
[INFO] [stdout] 96 | fn remove_letter_spacing(_moving_bits: &mut Vec<SingleDisplayData>) {
[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 8.77s
[INFO] running `Command { std: "docker" "inspect" "ea8b3750d83c9e6f984e61a1835e51aa4233898c1152288b96a89a7f30e3c338", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ea8b3750d83c9e6f984e61a1835e51aa4233898c1152288b96a89a7f30e3c338", kill_on_drop: false }`
[INFO] [stdout] ea8b3750d83c9e6f984e61a1835e51aa4233898c1152288b96a89a7f30e3c338