[INFO] fetching crate chessboard 0.0.1...
[INFO] documenting chessboard-0.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate chessboard 0.0.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate chessboard 0.0.1 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 chessboard 0.0.1
[INFO] finished tweaking crates.io crate chessboard 0.0.1
[INFO] tweaked toml for crates.io crate chessboard 0.0.1 written to /workspace/builds/worker-2/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-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 877dd4228cef466bdb87f90d3085b63b22097ae3f958a07bb6dc84903e131a33
[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" "877dd4228cef466bdb87f90d3085b63b22097ae3f958a07bb6dc84903e131a33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "877dd4228cef466bdb87f90d3085b63b22097ae3f958a07bb6dc84903e131a33", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "877dd4228cef466bdb87f90d3085b63b22097ae3f958a07bb6dc84903e131a33", kill_on_drop: false }`
[INFO] [stdout] 877dd4228cef466bdb87f90d3085b63b22097ae3f958a07bb6dc84903e131a33
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] d4485df51d17674d3d97bd3d11e3962f0c116a808e5c685637f1e7841a0b0e09
[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" "d4485df51d17674d3d97bd3d11e3962f0c116a808e5c685637f1e7841a0b0e09", kill_on_drop: false }`
[INFO] [stderr]  Documenting chessboard v0.0.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.41s
[INFO] running `Command { std: "docker" "inspect" "d4485df51d17674d3d97bd3d11e3962f0c116a808e5c685637f1e7841a0b0e09", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d4485df51d17674d3d97bd3d11e3962f0c116a808e5c685637f1e7841a0b0e09", kill_on_drop: false }`
[INFO] [stdout] d4485df51d17674d3d97bd3d11e3962f0c116a808e5c685637f1e7841a0b0e09