[INFO] fetching crate max-7219-led-matrix-util 0.1.4...
[INFO] checking max-7219-led-matrix-util-0.1.4 against try#0ab79c4b48ad19260fa46623f452c1b403a360e8 for pr-74315
[INFO] extracting crate max-7219-led-matrix-util 0.1.4 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate max-7219-led-matrix-util 0.1.4 on toolchain 0ab79c4b48ad19260fa46623f452c1b403a360e8
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "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-7/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" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded max7219 v0.2.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "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] 8de4ec4b631155fa84cba91a6f0ed0537a6a38f5cddb140f37b843c4194559d6
[INFO] running `Command { std: "docker" "start" "-a" "8de4ec4b631155fa84cba91a6f0ed0537a6a38f5cddb140f37b843c4194559d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8de4ec4b631155fa84cba91a6f0ed0537a6a38f5cddb140f37b843c4194559d6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8de4ec4b631155fa84cba91a6f0ed0537a6a38f5cddb140f37b843c4194559d6", kill_on_drop: false }`
[INFO] [stdout] 8de4ec4b631155fa84cba91a6f0ed0537a6a38f5cddb140f37b843c4194559d6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env@sha256:d9fbb4e2287ab3795bdefaf705efb7541a8875c13bce71e067d6b01dc5ed759b" "/opt/rustwide/cargo-home/bin/cargo" "+0ab79c4b48ad19260fa46623f452c1b403a360e8" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] ba5ff2ec2332f9a089fd7915d9abc4ea8ff3cc2619d92457fe78052a6bc0cdc3
[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" "ba5ff2ec2332f9a089fd7915d9abc4ea8ff3cc2619d92457fe78052a6bc0cdc3", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking nb v0.1.2
[INFO] [stderr]     Checking nix v0.14.1
[INFO] [stderr]     Checking embedded-hal v0.2.4
[INFO] [stderr]     Checking max7219 v0.2.2
[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 7.20s
[INFO] running `Command { std: "docker" "inspect" "ba5ff2ec2332f9a089fd7915d9abc4ea8ff3cc2619d92457fe78052a6bc0cdc3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ba5ff2ec2332f9a089fd7915d9abc4ea8ff3cc2619d92457fe78052a6bc0cdc3", kill_on_drop: false }`
[INFO] [stdout] ba5ff2ec2332f9a089fd7915d9abc4ea8ff3cc2619d92457fe78052a6bc0cdc3