[INFO] cloning repository https://github.com/fnick851/rust-the-book
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fnick851/rust-the-book" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffnick851%2Frust-the-book", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffnick851%2Frust-the-book'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 89593b4179cbb581f9f7fe49ad516af2d35f0ab7
[INFO] documenting fnick851/rust-the-book against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffnick851%2Frust-the-book" "/workspace/builds/worker-14/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-14/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/fnick851/rust-the-book 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 git repo https://github.com/fnick851/rust-the-book
[INFO] finished tweaking git repo https://github.com/fnick851/rust-the-book
[INFO] tweaked toml for git repo https://github.com/fnick851/rust-the-book written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] crate git repo https://github.com/fnick851/rust-the-book 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 ferris-says v0.1.1
[INFO] [stderr]   Downloaded smallvec v0.4.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 583f439150f5c80a13ff752d3adc08ce4c4dab5dc650e6c12f7eaf9562809c55
[INFO] running `Command { std: "docker" "start" "-a" "583f439150f5c80a13ff752d3adc08ce4c4dab5dc650e6c12f7eaf9562809c55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "583f439150f5c80a13ff752d3adc08ce4c4dab5dc650e6c12f7eaf9562809c55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "583f439150f5c80a13ff752d3adc08ce4c4dab5dc650e6c12f7eaf9562809c55", kill_on_drop: false }`
[INFO] [stdout] 583f439150f5c80a13ff752d3adc08ce4c4dab5dc650e6c12f7eaf9562809c55
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] bf7b4ad83a35c53fa562fb4147b2858df921ee9e71dbe02e8aa12afa7c79ecab
[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" "bf7b4ad83a35c53fa562fb4147b2858df921ee9e71dbe02e8aa12afa7c79ecab", kill_on_drop: false }`
[INFO] [stderr]    Compiling cc v1.0.46
[INFO] [stderr]     Checking unicode-width v0.1.6
[INFO] [stderr]     Checking smallvec v0.4.5
[INFO] [stderr]     Checking atty v0.2.13
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking textwrap v0.11.0
[INFO] [stderr]     Checking clap v2.33.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking error-chain v0.10.0
[INFO] [stderr]     Checking ferris-says v0.1.1
[INFO] [stderr]     Checking hello_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting hello_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: Could not document `hello_rust`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name super_path src/bin/super_path.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern ferris_says=/opt/rustwide/target/debug/deps/libferris_says-7b26851f4f1086fd.rmeta --extern hello_rust=/opt/rustwide/target/debug/deps/libhello_rust-84d7342dd4e4cc6f.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b490c5b9afcfa764.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "bf7b4ad83a35c53fa562fb4147b2858df921ee9e71dbe02e8aa12afa7c79ecab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bf7b4ad83a35c53fa562fb4147b2858df921ee9e71dbe02e8aa12afa7c79ecab", kill_on_drop: false }`
[INFO] [stdout] bf7b4ad83a35c53fa562fb4147b2858df921ee9e71dbe02e8aa12afa7c79ecab