[INFO] fetching crate ctor 0.1.15...
[INFO] documenting ctor-0.1.15 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate ctor 0.1.15 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate ctor 0.1.15 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 ctor 0.1.15
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate ctor 0.1.15
[INFO] tweaked toml for crates.io crate ctor 0.1.15 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate ctor 0.1.15 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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 54baab4d31edce60e0aa82f7d55ba523da83ac4a2f094541337a098f4049b637
[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" "54baab4d31edce60e0aa82f7d55ba523da83ac4a2f094541337a098f4049b637", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "54baab4d31edce60e0aa82f7d55ba523da83ac4a2f094541337a098f4049b637", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "54baab4d31edce60e0aa82f7d55ba523da83ac4a2f094541337a098f4049b637", kill_on_drop: false }`
[INFO] [stdout] 54baab4d31edce60e0aa82f7d55ba523da83ac4a2f094541337a098f4049b637
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 655dbaed07866f17524193b625568b78c40c339771d3b4d58c796cca8d50b3e0
[INFO] running `Command { std: "docker" "start" "-a" "655dbaed07866f17524193b625568b78c40c339771d3b4d58c796cca8d50b3e0", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking unicode-xid v0.2.0
[INFO] [stderr]    Compiling syn v1.0.30
[INFO] [stderr]     Checking quote v1.0.7
[INFO] [stderr]  Documenting ctor v0.1.15 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.88s
[INFO] running `Command { std: "docker" "inspect" "655dbaed07866f17524193b625568b78c40c339771d3b4d58c796cca8d50b3e0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "655dbaed07866f17524193b625568b78c40c339771d3b4d58c796cca8d50b3e0", kill_on_drop: false }`
[INFO] [stdout] 655dbaed07866f17524193b625568b78c40c339771d3b4d58c796cca8d50b3e0