[INFO] fetching crate max-7219-led-matrix-util 0.1.4...
[INFO] checking max-7219-led-matrix-util-0.1.4 against try#7b3565da729099dbe807466fcd118fb2815986e0 for pr-81789
[INFO] extracting crate max-7219-led-matrix-util 0.1.4 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate max-7219-led-matrix-util 0.1.4 on toolchain 7b3565da729099dbe807466fcd118fb2815986e0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-0/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" "+7b3565da729099dbe807466fcd118fb2815986e0" "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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a4fbf26f83c429ede6be41df559ab6da216d03544c37b8c3faa7404c978c91e0
[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" "a4fbf26f83c429ede6be41df559ab6da216d03544c37b8c3faa7404c978c91e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a4fbf26f83c429ede6be41df559ab6da216d03544c37b8c3faa7404c978c91e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a4fbf26f83c429ede6be41df559ab6da216d03544c37b8c3faa7404c978c91e0", kill_on_drop: false }`
[INFO] [stdout] a4fbf26f83c429ede6be41df559ab6da216d03544c37b8c3faa7404c978c91e0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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@sha256:20528e8c29e4536546f0102ce88568b16ea7538393a33fcca951030f7af10457" "/opt/rustwide/cargo-home/bin/cargo" "+7b3565da729099dbe807466fcd118fb2815986e0" "check" "--frozen" "--all" "--all-targets" "--message-format=json", 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] bc93944b97cea67af0a7c6b92512a41ac021b03d2378d95499062b318390c562
[INFO] running `Command { std: "docker" "start" "-a" "bc93944b97cea67af0a7c6b92512a41ac021b03d2378d95499062b318390c562", 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: 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: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.70s
[INFO] running `Command { std: "docker" "inspect" "bc93944b97cea67af0a7c6b92512a41ac021b03d2378d95499062b318390c562", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bc93944b97cea67af0a7c6b92512a41ac021b03d2378d95499062b318390c562", kill_on_drop: false }`
[INFO] [stdout] bc93944b97cea67af0a7c6b92512a41ac021b03d2378d95499062b318390c562