[INFO] fetching crate libarc 0.1.0...
[INFO] documenting libarc-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate libarc 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate libarc 0.1.0 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 libarc 0.1.0
[INFO] finished tweaking crates.io crate libarc 0.1.0
[INFO] tweaked toml for crates.io crate libarc 0.1.0 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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 tokio-async v0.0.0
[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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 63ba51e4d62a3c8c23c928cd11750f78742576792c1930ae9ebc14f0b668dcaa
[INFO] running `Command { std: "docker" "start" "-a" "63ba51e4d62a3c8c23c928cd11750f78742576792c1930ae9ebc14f0b668dcaa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "63ba51e4d62a3c8c23c928cd11750f78742576792c1930ae9ebc14f0b668dcaa", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "63ba51e4d62a3c8c23c928cd11750f78742576792c1930ae9ebc14f0b668dcaa", kill_on_drop: false }`
[INFO] [stdout] 63ba51e4d62a3c8c23c928cd11750f78742576792c1930ae9ebc14f0b668dcaa
[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] 1c54f30b762bb86c3de3cee0e831fd83f8e640bd8bd120b835c33c40b1a8e676
[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" "1c54f30b762bb86c3de3cee0e831fd83f8e640bd8bd120b835c33c40b1a8e676", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v1.0.39
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling itoa v0.4.6
[INFO] [stderr]     Checking futures-task v0.3.5
[INFO] [stderr]     Checking futures-sink v0.3.5
[INFO] [stderr]    Compiling stdweb-internal-runtime v0.1.5
[INFO] [stderr]    Compiling base-x v0.2.6
[INFO] [stderr]     Checking try-lock v0.2.3
[INFO] [stderr]    Compiling sha1 v0.6.0
[INFO] [stderr]     Checking discard v1.0.4
[INFO] [stderr]     Checking tower-service v0.3.0
[INFO] [stderr]     Checking tokio-async v0.0.0
[INFO] [stderr]     Checking tracing-core v0.1.15
[INFO] [stderr]     Checking futures-channel v0.3.5
[INFO] [stderr]     Checking http v0.2.1
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling ryu v1.0.5
[INFO] [stderr]     Checking hashbrown v0.8.2
[INFO] [stderr]     Checking want v0.3.0
[INFO] [stderr]    Compiling stdweb v0.4.20
[INFO] [stderr]     Checking socket2 v0.3.12
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking mio v0.6.22
[INFO] [stderr]     Checking tracing v0.1.19
[INFO] [stderr]     Checking indexmap v1.5.2
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking http-body v0.3.1
[INFO] [stderr]     Checking tokio-util v0.3.1
[INFO] [stderr]    Compiling pin-project-internal v0.4.23
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]     Checking pin-project v0.4.23
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking h2 v0.2.6
[INFO] [stderr]    Compiling stdweb-internal-macros v0.2.9
[INFO] [stderr]    Compiling stdweb-derive v0.5.3
[INFO] [stderr]     Checking hyper v0.13.7
[INFO] [stderr]  Documenting libarc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 14s
[INFO] running `Command { std: "docker" "inspect" "1c54f30b762bb86c3de3cee0e831fd83f8e640bd8bd120b835c33c40b1a8e676", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1c54f30b762bb86c3de3cee0e831fd83f8e640bd8bd120b835c33c40b1a8e676", kill_on_drop: false }`
[INFO] [stdout] 1c54f30b762bb86c3de3cee0e831fd83f8e640bd8bd120b835c33c40b1a8e676