[INFO] fetching crate max-7219-led-matrix-util 0.1.4...
[INFO] documenting max-7219-led-matrix-util-0.1.4 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate max-7219-led-matrix-util 0.1.4 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate max-7219-led-matrix-util 0.1.4 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "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-2/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" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded max7219 v0.2.2
[INFO] [stderr]   Downloaded gpio-cdev v0.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] e39b430b259ae9d7948c0c2f8780f7b0ea1b944dd73abf04ea302d7451b74b26
[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" "e39b430b259ae9d7948c0c2f8780f7b0ea1b944dd73abf04ea302d7451b74b26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e39b430b259ae9d7948c0c2f8780f7b0ea1b944dd73abf04ea302d7451b74b26", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e39b430b259ae9d7948c0c2f8780f7b0ea1b944dd73abf04ea302d7451b74b26", kill_on_drop: false }`
[INFO] [stdout] e39b430b259ae9d7948c0c2f8780f7b0ea1b944dd73abf04ea302d7451b74b26
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 15ae7dc1b243213db74a51a9d72ce5af4b8c1b829183fac9f6d959c874aad396
[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" "15ae7dc1b243213db74a51a9d72ce5af4b8c1b829183fac9f6d959c874aad396", kill_on_drop: false }`
[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] [stderr]  Documenting 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] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.18s
[INFO] running `Command { std: "docker" "inspect" "15ae7dc1b243213db74a51a9d72ce5af4b8c1b829183fac9f6d959c874aad396", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "15ae7dc1b243213db74a51a9d72ce5af4b8c1b829183fac9f6d959c874aad396", kill_on_drop: false }`
[INFO] [stdout] 15ae7dc1b243213db74a51a9d72ce5af4b8c1b829183fac9f6d959c874aad396