[INFO] fetching crate iterator 0.0.0...
[INFO] documenting iterator-0.0.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate iterator 0.0.0 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate iterator 0.0.0 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 iterator 0.0.0
[INFO] finished tweaking crates.io crate iterator 0.0.0
[INFO] tweaked toml for crates.io crate iterator 0.0.0 written to /workspace/builds/worker-12/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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 57574d7547d4d76391dc7f3783e558c4b3db4b444ed7cb5e99340300566ed2d4
[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" "57574d7547d4d76391dc7f3783e558c4b3db4b444ed7cb5e99340300566ed2d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "57574d7547d4d76391dc7f3783e558c4b3db4b444ed7cb5e99340300566ed2d4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "57574d7547d4d76391dc7f3783e558c4b3db4b444ed7cb5e99340300566ed2d4", kill_on_drop: false }`
[INFO] [stdout] 57574d7547d4d76391dc7f3783e558c4b3db4b444ed7cb5e99340300566ed2d4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] ccc3a231f3e7b016390e7ce0ac7934ab7a838a2e91a61581d518cb5dc596d4a3
[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" "ccc3a231f3e7b016390e7ce0ac7934ab7a838a2e91a61581d518cb5dc596d4a3", kill_on_drop: false }`
[INFO] [stderr]  Documenting iterator v0.0.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.04s
[INFO] running `Command { std: "docker" "inspect" "ccc3a231f3e7b016390e7ce0ac7934ab7a838a2e91a61581d518cb5dc596d4a3", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ccc3a231f3e7b016390e7ce0ac7934ab7a838a2e91a61581d518cb5dc596d4a3", kill_on_drop: false }`
[INFO] [stdout] ccc3a231f3e7b016390e7ce0ac7934ab7a838a2e91a61581d518cb5dc596d4a3