[INFO] fetching crate derive_wrapper 0.1.6...
[INFO] documenting derive_wrapper-0.1.6 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate derive_wrapper 0.1.6 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate derive_wrapper 0.1.6 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 derive_wrapper 0.1.6
[INFO] finished tweaking crates.io crate derive_wrapper 0.1.6
[INFO] tweaked toml for crates.io crate derive_wrapper 0.1.6 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate derive_wrapper 0.1.6 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-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 959e060f6616332604d85c927b210dd4ae86a665b295014d1422cf9e296fd044
[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" "959e060f6616332604d85c927b210dd4ae86a665b295014d1422cf9e296fd044", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "959e060f6616332604d85c927b210dd4ae86a665b295014d1422cf9e296fd044", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "959e060f6616332604d85c927b210dd4ae86a665b295014d1422cf9e296fd044", kill_on_drop: false }`
[INFO] [stdout] 959e060f6616332604d85c927b210dd4ae86a665b295014d1422cf9e296fd044
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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] 90e1b2cf832395d686365ebc642f4f39836d70b15a4845906374f967be81c91a
[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" "90e1b2cf832395d686365ebc642f4f39836d70b15a4845906374f967be81c91a", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]     Checking quote v0.6.13
[INFO] [stderr]     Checking syn v0.15.44
[INFO] [stderr]  Documenting derive_wrapper v0.1.6 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.30s
[INFO] running `Command { std: "docker" "inspect" "90e1b2cf832395d686365ebc642f4f39836d70b15a4845906374f967be81c91a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "90e1b2cf832395d686365ebc642f4f39836d70b15a4845906374f967be81c91a", kill_on_drop: false }`
[INFO] [stdout] 90e1b2cf832395d686365ebc642f4f39836d70b15a4845906374f967be81c91a