[INFO] fetching crate basic_tree 0.2.5...
[INFO] documenting basic_tree-0.2.5 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate basic_tree 0.2.5 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate basic_tree 0.2.5 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate basic_tree 0.2.5
[INFO] finished tweaking crates.io crate basic_tree 0.2.5
[INFO] tweaked toml for crates.io crate basic_tree 0.2.5 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "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] 3717ce3aaff768dbf8e05b1acf7ce7ac1a3211dbe36d7d5a8b96d3b25a1b870f
[INFO] running `Command { std: "docker" "start" "-a" "3717ce3aaff768dbf8e05b1acf7ce7ac1a3211dbe36d7d5a8b96d3b25a1b870f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3717ce3aaff768dbf8e05b1acf7ce7ac1a3211dbe36d7d5a8b96d3b25a1b870f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3717ce3aaff768dbf8e05b1acf7ce7ac1a3211dbe36d7d5a8b96d3b25a1b870f", kill_on_drop: false }`
[INFO] [stdout] 3717ce3aaff768dbf8e05b1acf7ce7ac1a3211dbe36d7d5a8b96d3b25a1b870f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 900b4e21dedfc9add884b88aa422a697eace1c1d10c2f9be43f15753931aba00
[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" "900b4e21dedfc9add884b88aa422a697eace1c1d10c2f9be43f15753931aba00", kill_on_drop: false }`
[INFO] [stderr]  Documenting basic_tree v0.2.5 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.52s
[INFO] running `Command { std: "docker" "inspect" "900b4e21dedfc9add884b88aa422a697eace1c1d10c2f9be43f15753931aba00", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "900b4e21dedfc9add884b88aa422a697eace1c1d10c2f9be43f15753931aba00", kill_on_drop: false }`
[INFO] [stdout] 900b4e21dedfc9add884b88aa422a697eace1c1d10c2f9be43f15753931aba00