[INFO] fetching crate shell-hooks 0.1.2...
[INFO] documenting shell-hooks-0.1.2 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate shell-hooks 0.1.2 into /workspace/builds/worker-5/source
[INFO] validating manifest of crates.io crate shell-hooks 0.1.2 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 shell-hooks 0.1.2
[INFO] finished tweaking crates.io crate shell-hooks 0.1.2
[INFO] tweaked toml for crates.io crate shell-hooks 0.1.2 written to /workspace/builds/worker-5/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] 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-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] a2f3bf2353050e62f1e390c73db5470520afba9c145e317d1620102352e5ade1
[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" "a2f3bf2353050e62f1e390c73db5470520afba9c145e317d1620102352e5ade1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a2f3bf2353050e62f1e390c73db5470520afba9c145e317d1620102352e5ade1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a2f3bf2353050e62f1e390c73db5470520afba9c145e317d1620102352e5ade1", kill_on_drop: false }`
[INFO] [stdout] a2f3bf2353050e62f1e390c73db5470520afba9c145e317d1620102352e5ade1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] bb10cb43b373850f500a18148fd0db7e3888aba64147403199555add1845d797
[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" "bb10cb43b373850f500a18148fd0db7e3888aba64147403199555add1845d797", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Documenting shell-hooks v0.1.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/bin/shell-hooks.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(vec_remove_item)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 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 `shell-hooks`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name shell_hooks src/bin/shell-hooks.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern dirs=/opt/rustwide/target/debug/deps/libdirs-da9d4d29378ffeff.rmeta --extern libc=/opt/rustwide/target/debug/deps/liblibc-b01e5f49cd1b74e8.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ec5e695d7e4b5284.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-e14ca5de376ec3cc.so --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-4faefe19b62df87d.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-0ad170e2e4b6f63f.rmeta --extern walkdir=/opt/rustwide/target/debug/deps/libwalkdir-37c1eba6428ea4cb.rmeta --cap-lints=warn --crate-version 0.1.2` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "bb10cb43b373850f500a18148fd0db7e3888aba64147403199555add1845d797", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "bb10cb43b373850f500a18148fd0db7e3888aba64147403199555add1845d797", kill_on_drop: false }`
[INFO] [stdout] bb10cb43b373850f500a18148fd0db7e3888aba64147403199555add1845d797