[INFO] cloning repository https://github.com/Mcat12/backtrack
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Mcat12/backtrack" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcat12%2Fbacktrack", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FMcat12%2Fbacktrack'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9a37c73ecf8ae1343a37bfea66982263d88bb0e4
[INFO] documenting Mcat12/backtrack 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%2FMcat12%2Fbacktrack" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Mcat12/backtrack 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/Mcat12/backtrack
[INFO] finished tweaking git repo https://github.com/Mcat12/backtrack
[INFO] tweaked toml for git repo https://github.com/Mcat12/backtrack written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/Mcat12/backtrack 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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded simplelog v0.5.3
[INFO] [stderr]   Downloaded regex-syntax v0.6.4
[INFO] [stderr]   Downloaded criterion-plot v0.2.5
[INFO] [stderr]   Downloaded thread-scoped v1.0.2
[INFO] [stderr]   Downloaded handlebars v0.32.4
[INFO] [stderr]   Downloaded serde_derive v1.0.81
[INFO] [stderr]   Downloaded term v0.5.1
[INFO] [stderr]   Downloaded serde_json v1.0.33
[INFO] [stderr]   Downloaded cast v0.2.2
[INFO] [stderr]   Downloaded pest v1.0.6
[INFO] [stderr]   Downloaded winapi-util v0.1.1
[INFO] [stderr]   Downloaded csv v1.0.2
[INFO] [stderr]   Downloaded criterion v0.2.5
[INFO] [stderr]   Downloaded memchr v2.1.1
[INFO] [stderr]   Downloaded csv-core v0.1.4
[INFO] [stderr]   Downloaded redox_syscall v0.1.43
[INFO] [stderr]   Downloaded itertools-num v0.1.3
[INFO] [stderr]   Downloaded serde v1.0.81
[INFO] [stderr]   Downloaded byteorder v1.2.7
[INFO] [stderr]   Downloaded cc v1.0.25
[INFO] [stderr]   Downloaded aho-corasick v0.6.9
[INFO] [stderr]   Downloaded criterion-stats v0.2.5
[INFO] [stderr]   Downloaded pest_derive v1.0.8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] adb574bcaf9f83a2792bcb293b83950176fcd8b857c906849c7db328d9f5f1ac
[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" "adb574bcaf9f83a2792bcb293b83950176fcd8b857c906849c7db328d9f5f1ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "adb574bcaf9f83a2792bcb293b83950176fcd8b857c906849c7db328d9f5f1ac", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "adb574bcaf9f83a2792bcb293b83950176fcd8b857c906849c7db328d9f5f1ac", kill_on_drop: false }`
[INFO] [stdout] adb574bcaf9f83a2792bcb293b83950176fcd8b857c906849c7db328d9f5f1ac
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 93e6783066662ce8e9dd112ee67cf7b3306f76a91792777a60d56752cde00b4e
[INFO] running `Command { std: "docker" "start" "-a" "93e6783066662ce8e9dd112ee67cf7b3306f76a91792777a60d56752cde00b4e", kill_on_drop: false }`
[INFO] [stderr]  Documenting backtrack v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.57s
[INFO] running `Command { std: "docker" "inspect" "93e6783066662ce8e9dd112ee67cf7b3306f76a91792777a60d56752cde00b4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "93e6783066662ce8e9dd112ee67cf7b3306f76a91792777a60d56752cde00b4e", kill_on_drop: false }`
[INFO] [stdout] 93e6783066662ce8e9dd112ee67cf7b3306f76a91792777a60d56752cde00b4e