[INFO] cloning repository https://github.com/iThinkyouknow/rust-web-crawler
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/iThinkyouknow/rust-web-crawler" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FiThinkyouknow%2Frust-web-crawler", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FiThinkyouknow%2Frust-web-crawler'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 558649b67a64eb1331a6c1dc6fd1567126b6d410
[INFO] documenting iThinkyouknow/rust-web-crawler 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%2FiThinkyouknow%2Frust-web-crawler" "/workspace/builds/worker-4/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/iThinkyouknow/rust-web-crawler 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/iThinkyouknow/rust-web-crawler
[INFO] finished tweaking git repo https://github.com/iThinkyouknow/rust-web-crawler
[INFO] tweaked toml for git repo https://github.com/iThinkyouknow/rust-web-crawler written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/iThinkyouknow/rust-web-crawler 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 markup5ever v0.6.2
[INFO] [stderr]   Downloaded html5ever v0.21.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] c0ec15d8d15f0890276b7d45a93313ded0aa01934ad9549ba491f4ac3e62cbe4
[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" "c0ec15d8d15f0890276b7d45a93313ded0aa01934ad9549ba491f4ac3e62cbe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c0ec15d8d15f0890276b7d45a93313ded0aa01934ad9549ba491f4ac3e62cbe4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c0ec15d8d15f0890276b7d45a93313ded0aa01934ad9549ba491f4ac3e62cbe4", kill_on_drop: false }`
[INFO] [stdout] c0ec15d8d15f0890276b7d45a93313ded0aa01934ad9549ba491f4ac3e62cbe4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 2f75740ff9b06dd54b35da63104cddf902543eebafd7d9c3c566503ad3f74ed8
[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" "2f75740ff9b06dd54b35da63104cddf902543eebafd7d9c3c566503ad3f74ed8", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.42
[INFO] [stderr]    Compiling string_cache_shared v0.3.0
[INFO] [stderr]     Checking matches v0.1.7
[INFO] [stderr]    Compiling version_check v0.1.4
[INFO] [stderr]     Checking utf-8 v0.7.2
[INFO] [stderr]     Checking log v0.4.3
[INFO] [stderr]    Compiling phf_shared v0.7.22
[INFO] [stderr]     Checking rand v0.4.2
[INFO] [stderr]    Compiling httparse v1.3.2
[INFO] [stderr]     Checking num_cpus v1.8.0
[INFO] [stderr]     Checking time v0.1.40
[INFO] [stderr]     Checking new_debug_unreachable v1.0.1
[INFO] [stderr]     Checking base64 v0.6.0
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]     Checking unicode-bidi v0.3.4
[INFO] [stderr]     Checking futf v0.1.4
[INFO] [stderr]     Checking phf v0.7.22
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]    Compiling unicase v1.4.2
[INFO] [stderr]     Checking tendril v0.4.0
[INFO] [stderr]     Checking mime v0.2.6
[INFO] [stderr]     Checking idna v0.1.5
[INFO] [stderr]     Checking rand v0.3.22
[INFO] [stderr]     Checking uuid v0.1.18
[INFO] [stderr]     Checking url v1.7.1
[INFO] [stderr]     Checking url v0.2.38
[INFO] [stderr]    Compiling phf_generator v0.7.22
[INFO] [stderr]    Compiling string_cache_codegen v0.4.1
[INFO] [stderr]    Compiling phf_codegen v0.7.22
[INFO] [stderr]     Checking hyper v0.10.13
[INFO] [stderr]    Compiling string_cache v0.6.2
[INFO] [stderr]    Compiling markup5ever v0.6.2
[INFO] [stderr]    Compiling html5ever v0.21.0
[INFO] [stderr]  Documenting web_crawler v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 31.57s
[INFO] running `Command { std: "docker" "inspect" "2f75740ff9b06dd54b35da63104cddf902543eebafd7d9c3c566503ad3f74ed8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f75740ff9b06dd54b35da63104cddf902543eebafd7d9c3c566503ad3f74ed8", kill_on_drop: false }`
[INFO] [stdout] 2f75740ff9b06dd54b35da63104cddf902543eebafd7d9c3c566503ad3f74ed8