[INFO] cloning repository https://github.com/ctbur/async
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ctbur/async" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fctbur%2Fasync", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fctbur%2Fasync'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0121ca53f21472d2fb39d3c8a7d6c75bc88532bf
[INFO] documenting ctbur/async against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fctbur%2Fasync" "/workspace/builds/worker-12/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-12/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ctbur/async 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 git repo https://github.com/ctbur/async
[INFO] finished tweaking git repo https://github.com/ctbur/async
[INFO] tweaked toml for git repo https://github.com/ctbur/async written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/ctbur/async 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded num_cpus v1.10.1
[INFO] [stderr]   Downloaded bitflags v1.1.0
[INFO] [stderr]   Downloaded serde_derive v1.0.92
[INFO] [stderr]   Downloaded bincode v1.1.4
[INFO] [stderr]   Downloaded byteorder v1.3.2
[INFO] [stderr]   Downloaded termcolor v1.0.5
[INFO] [stderr]   Downloaded autocfg v0.1.4
[INFO] [stderr]   Downloaded serde v1.0.92
[INFO] [stderr]   Downloaded regex v1.1.7
[INFO] [stderr]   Downloaded termion v1.5.3
[INFO] [stderr]   Downloaded regex-syntax v0.6.7
[INFO] [stderr]   Downloaded redox_syscall v0.1.54
[INFO] [stderr]   Downloaded structopt v0.2.16
[INFO] [stderr]   Downloaded unicode-segmentation v1.3.0
[INFO] [stderr]   Downloaded structopt-derive v0.2.16
[INFO] [stderr]   Downloaded libc v0.2.58
[INFO] [stderr]   Downloaded quote v0.6.12
[INFO] [stderr]   Downloaded syn v0.15.36
[INFO] [stderr]   Downloaded threadpool v1.7.1
[INFO] [stderr]   Downloaded cfg-if v0.1.9
[INFO] [stderr]   Downloaded utf8-ranges v1.0.3
[INFO] [stderr]   Downloaded numtoa v0.1.0
[INFO] [stderr]   Downloaded clap v2.33.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] 14667852adb364311fb6f9db9a354b41e1dd703a2c7cb3777caaf9006555c695
[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" "14667852adb364311fb6f9db9a354b41e1dd703a2c7cb3777caaf9006555c695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "14667852adb364311fb6f9db9a354b41e1dd703a2c7cb3777caaf9006555c695", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14667852adb364311fb6f9db9a354b41e1dd703a2c7cb3777caaf9006555c695", kill_on_drop: false }`
[INFO] [stdout] 14667852adb364311fb6f9db9a354b41e1dd703a2c7cb3777caaf9006555c695
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] fa5abe5c38278737296712adfd3471d20bade14f144ce3715164ead7d7058eda
[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" "fa5abe5c38278737296712adfd3471d20bade14f144ce3715164ead7d7058eda", kill_on_drop: false }`
[INFO] [stderr]    Compiling syn v0.15.36
[INFO] [stderr]     Checking threadpool v1.7.1
[INFO] [stderr]     Checking env_logger v0.6.1
[INFO] [stderr]    Compiling serde_derive v1.0.92
[INFO] [stderr]    Compiling structopt-derive v0.2.16
[INFO] [stderr]     Checking structopt v0.2.16
[INFO] [stderr]     Checking serde v1.0.92
[INFO] [stderr]     Checking bincode v1.1.4
[INFO] [stderr]  Documenting async-cmd v0.1.1 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 36.93s
[INFO] running `Command { std: "docker" "inspect" "fa5abe5c38278737296712adfd3471d20bade14f144ce3715164ead7d7058eda", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fa5abe5c38278737296712adfd3471d20bade14f144ce3715164ead7d7058eda", kill_on_drop: false }`
[INFO] [stdout] fa5abe5c38278737296712adfd3471d20bade14f144ce3715164ead7d7058eda