[INFO] fetching crate object 0.21.1...
[INFO] documenting object-0.21.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate object 0.21.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate object 0.21.1 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 object 0.21.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate object 0.21.1
[INFO] tweaked toml for crates.io crate object 0.21.1 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate crates.io crate object 0.21.1 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] 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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] a8a4d2585db16fd2bb8e2f534ba6cfab9604d83a3d3451a962cbf925dfdf1c6d
[INFO] running `Command { std: "docker" "start" "-a" "a8a4d2585db16fd2bb8e2f534ba6cfab9604d83a3d3451a962cbf925dfdf1c6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a8a4d2585db16fd2bb8e2f534ba6cfab9604d83a3d3451a962cbf925dfdf1c6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a8a4d2585db16fd2bb8e2f534ba6cfab9604d83a3d3451a962cbf925dfdf1c6d", kill_on_drop: false }`
[INFO] [stdout] a8a4d2585db16fd2bb8e2f534ba6cfab9604d83a3d3451a962cbf925dfdf1c6d
[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] 446ddd1b2190d2ca7ac39bd1a2a34cc480f56c830d6914e45d7adf176611bb88
[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" "446ddd1b2190d2ca7ac39bd1a2a34cc480f56c830d6914e45d7adf176611bb88", kill_on_drop: false }`
[INFO] [stderr]     Checking wasmparser v0.57.0
[INFO] [stderr]     Checking flate2 v1.0.16
[INFO] [stderr]  Documenting object v0.21.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.33s
[INFO] running `Command { std: "docker" "inspect" "446ddd1b2190d2ca7ac39bd1a2a34cc480f56c830d6914e45d7adf176611bb88", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "446ddd1b2190d2ca7ac39bd1a2a34cc480f56c830d6914e45d7adf176611bb88", kill_on_drop: false }`
[INFO] [stdout] 446ddd1b2190d2ca7ac39bd1a2a34cc480f56c830d6914e45d7adf176611bb88