[INFO] cloning repository https://github.com/daogangtang/learn-tokio
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/daogangtang/learn-tokio" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaogangtang%2Flearn-tokio", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fdaogangtang%2Flearn-tokio'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 98b13be0e474ffb1b6a4f84b3e9caa91d100296a
[INFO] documenting daogangtang/learn-tokio 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%2Fdaogangtang%2Flearn-tokio" "/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/daogangtang/learn-tokio 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/daogangtang/learn-tokio
[INFO] finished tweaking git repo https://github.com/daogangtang/learn-tokio
[INFO] tweaked toml for git repo https://github.com/daogangtang/learn-tokio written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate git repo https://github.com/daogangtang/learn-tokio 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-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] 5af112fde574ef02600de132bc5ec087b76e19ac9640fea9f9fd01e7b8115856
[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" "5af112fde574ef02600de132bc5ec087b76e19ac9640fea9f9fd01e7b8115856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5af112fde574ef02600de132bc5ec087b76e19ac9640fea9f9fd01e7b8115856", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5af112fde574ef02600de132bc5ec087b76e19ac9640fea9f9fd01e7b8115856", kill_on_drop: false }`
[INFO] [stdout] 5af112fde574ef02600de132bc5ec087b76e19ac9640fea9f9fd01e7b8115856
[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] 3f7ddcc1d198e8b3e181e4fd695180721dcc6fe1515e0e4a8077f76c1385a116
[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" "3f7ddcc1d198e8b3e181e4fd695180721dcc6fe1515e0e4a8077f76c1385a116", kill_on_drop: false }`
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]     Checking tokio-io v0.1.10
[INFO] [stderr]     Checking tokio-threadpool v0.1.8
[INFO] [stderr]     Checking tokio-codec v0.1.1
[INFO] [stderr]     Checking tokio-fs v0.1.4
[INFO] [stderr]     Checking tokio-reactor v0.1.6
[INFO] [stderr]     Checking mio-uds v0.6.7
[INFO] [stderr]     Checking tokio-tcp v0.1.2
[INFO] [stderr]     Checking tokio-udp v0.1.2
[INFO] [stderr]     Checking tokio-uds v0.2.3
[INFO] [stderr]     Checking tokio v0.1.11
[INFO] [stderr]  Documenting learn-tokio0 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] error: Could not document `learn-tokio0`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name concurrent_send_recv src/concurrent_send_recv.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bytes=/opt/rustwide/target/debug/deps/libbytes-77f172268306bc41.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-cf2af106ce6675af.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-242f4f7479a87a15.rmeta --extern tokio_codec=/opt/rustwide/target/debug/deps/libtokio_codec-e745c22759360dbf.rmeta --cap-lints=warn --crate-version 0.1.0` (signal: 9, SIGKILL: kill)
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stdout] warning: could not parse code block as Rust code
[INFO] [stdout]   --> src/print_each_packet.rs:12:9
[INFO] [stdout]    |
[INFO] [stdout] 12 | //!     cargo run --example print\_each\_packet
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: error from rustc: unknown start of token: \
[INFO] [stdout]    = note: error from rustc: unknown start of token: \
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 1 warning emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "3f7ddcc1d198e8b3e181e4fd695180721dcc6fe1515e0e4a8077f76c1385a116", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3f7ddcc1d198e8b3e181e4fd695180721dcc6fe1515e0e4a8077f76c1385a116", kill_on_drop: false }`
[INFO] [stdout] 3f7ddcc1d198e8b3e181e4fd695180721dcc6fe1515e0e4a8077f76c1385a116