[INFO] fetching crate discotech_zookeeper 0.1.0...
[INFO] documenting discotech_zookeeper-0.1.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate discotech_zookeeper 0.1.0 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate discotech_zookeeper 0.1.0 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 discotech_zookeeper 0.1.0
[INFO] finished tweaking crates.io crate discotech_zookeeper 0.1.0
[INFO] tweaked toml for crates.io crate discotech_zookeeper 0.1.0 written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded enum_primitive v0.0.2
[INFO] [stderr]   Downloaded schedule_recv v0.0.1
[INFO] [stderr]   Downloaded log4rs v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] b64fbbad0313475c40f8f5df9c7c365688056482b6a3cacc989782087be994b8
[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" "b64fbbad0313475c40f8f5df9c7c365688056482b6a3cacc989782087be994b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b64fbbad0313475c40f8f5df9c7c365688056482b6a3cacc989782087be994b8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b64fbbad0313475c40f8f5df9c7c365688056482b6a3cacc989782087be994b8", kill_on_drop: false }`
[INFO] [stdout] b64fbbad0313475c40f8f5df9c7c365688056482b6a3cacc989782087be994b8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] 5aa7dc050d920397a92ccb8930995a3241c6f794a18e834b2c34a8f7dc61dd04
[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" "5aa7dc050d920397a92ccb8930995a3241c6f794a18e834b2c34a8f7dc61dd04", kill_on_drop: false }`
[INFO] [stderr]     Checking time v0.2.17
[INFO] [stderr]     Checking enum_primitive v0.0.2
[INFO] [stderr]     Checking schedule_recv v0.0.1
[INFO] [stderr]  Documenting discotech_zookeeper v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error: cannot find macro `select` in this scope
[INFO] [stdout]    --> src/zookeeper.rs:163:21
[INFO] [stdout]     |
[INFO] [stdout] 163 |                     select! {
[INFO] [stdout]     |                     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(duration, mpsc_select)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 3 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: Could not document `discotech_zookeeper`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name discotech_zookeeper src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-16dd5c83a1a872e2.rmeta --extern enum_primitive=/opt/rustwide/target/debug/deps/libenum_primitive-20ed35c043d32c60.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-39376325fae1b39f.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-76c2f19b1103e931.rmeta --extern schedule_recv=/opt/rustwide/target/debug/deps/libschedule_recv-897228f49abe956b.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "5aa7dc050d920397a92ccb8930995a3241c6f794a18e834b2c34a8f7dc61dd04", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5aa7dc050d920397a92ccb8930995a3241c6f794a18e834b2c34a8f7dc61dd04", kill_on_drop: false }`
[INFO] [stdout] 5aa7dc050d920397a92ccb8930995a3241c6f794a18e834b2c34a8f7dc61dd04