[INFO] fetching crate hp-log 0.3.1...
[INFO] documenting hp-log-0.3.1 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate hp-log 0.3.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate hp-log 0.3.1 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate hp-log 0.3.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate hp-log 0.3.1
[INFO] tweaked toml for crates.io crate hp-log 0.3.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] crate crates.io crate hp-log 0.3.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--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-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dd0963d44dc662dc27d55dca067b2d996f54c685830d52c27ec87abcebf7a875
[INFO] running `Command { std: "docker" "start" "-a" "dd0963d44dc662dc27d55dca067b2d996f54c685830d52c27ec87abcebf7a875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "dd0963d44dc662dc27d55dca067b2d996f54c685830d52c27ec87abcebf7a875", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dd0963d44dc662dc27d55dca067b2d996f54c685830d52c27ec87abcebf7a875", kill_on_drop: false }`
[INFO] [stdout] dd0963d44dc662dc27d55dca067b2d996f54c685830d52c27ec87abcebf7a875
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dbc0fd6008f46fbb61761f0bc14f6676c89ee6211834dc89bb484181afc3bd47
[INFO] running `Command { std: "docker" "start" "-a" "dbc0fd6008f46fbb61761f0bc14f6676c89ee6211834dc89bb484181afc3bd47", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]     Checking cfg-if v0.1.9
[INFO] [stderr]     Checking strfmt v0.1.6
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]  Documenting hp-log v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:2:2
[INFO] [stdout]   |
[INFO] [stdout] 2 |  #![feature(rustc_private)]
[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 `hp-log`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name hp_log src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=f41e85b26a959e41 -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-e09483f06bd0852f.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-2bfe40a43a6160dc.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-38d332835798d452.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-f2172ec77af8420d.so --extern strfmt=/opt/rustwide/target/debug/deps/libstrfmt-2721d5cd6b9d5935.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-65fd54ab9171f100.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-027250767b86658a.rmeta --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "dbc0fd6008f46fbb61761f0bc14f6676c89ee6211834dc89bb484181afc3bd47", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "dbc0fd6008f46fbb61761f0bc14f6676c89ee6211834dc89bb484181afc3bd47", kill_on_drop: false }`
[INFO] [stdout] dbc0fd6008f46fbb61761f0bc14f6676c89ee6211834dc89bb484181afc3bd47