[INFO] fetching crate discotech_zookeeper 0.1.0...
[INFO] documenting discotech_zookeeper-0.1.0 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate discotech_zookeeper 0.1.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate discotech_zookeeper 0.1.0 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "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-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 13c54f495b3ea7ce8875865c217836810fa15acdf1cc1d5769cfad4c8244578f
[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" "13c54f495b3ea7ce8875865c217836810fa15acdf1cc1d5769cfad4c8244578f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "13c54f495b3ea7ce8875865c217836810fa15acdf1cc1d5769cfad4c8244578f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "13c54f495b3ea7ce8875865c217836810fa15acdf1cc1d5769cfad4c8244578f", kill_on_drop: false }`
[INFO] [stdout] 13c54f495b3ea7ce8875865c217836810fa15acdf1cc1d5769cfad4c8244578f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 0fab6be6c99f62b18cb666554cb9f6afd89697a06e7f390fe02a153754c5103d
[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" "0fab6be6c99f62b18cb666554cb9f6afd89697a06e7f390fe02a153754c5103d", kill_on_drop: false }`
[INFO] [stderr]     Checking num-complex v0.1.43
[INFO] [stderr]     Checking num-bigint v0.1.44
[INFO] [stderr]    Compiling time-macros-impl v0.1.1
[INFO] [stderr]     Checking num-rational v0.1.42
[INFO] [stderr]     Checking time-macros v0.1.1
[INFO] [stderr]     Checking time v0.2.22
[INFO] [stderr]     Checking num v0.1.42
[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 stable 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-ab79c8f1ac9655d3.rmeta --extern enum_primitive=/opt/rustwide/target/debug/deps/libenum_primitive-36ea09eda27f588c.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-7716449a6325aa11.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-443dd6cbf8b6b875.rmeta --extern schedule_recv=/opt/rustwide/target/debug/deps/libschedule_recv-ace4f0fcbb6f75e8.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "0fab6be6c99f62b18cb666554cb9f6afd89697a06e7f390fe02a153754c5103d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0fab6be6c99f62b18cb666554cb9f6afd89697a06e7f390fe02a153754c5103d", kill_on_drop: false }`
[INFO] [stdout] 0fab6be6c99f62b18cb666554cb9f6afd89697a06e7f390fe02a153754c5103d
