[INFO] fetching crate hp-log 0.3.1...
[INFO] documenting hp-log-0.3.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate hp-log 0.3.1 into /workspace/builds/worker-68/source
[INFO] validating manifest of crates.io crate hp-log 0.3.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "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-68/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-2021-08-01" "fetch" "--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 serde v1.0.94
[INFO] [stderr]   Downloaded strfmt v0.1.6
[INFO] [stderr]   Downloaded syn v0.15.39
[INFO] [stderr]   Downloaded serde_derive v1.0.94
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c5156c39bd66bafd777147610cdd7ca9e2910a1b420609c958b2f8735df6a6f1
[INFO] running `Command { std: "docker" "start" "-a" "c5156c39bd66bafd777147610cdd7ca9e2910a1b420609c958b2f8735df6a6f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c5156c39bd66bafd777147610cdd7ca9e2910a1b420609c958b2f8735df6a6f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c5156c39bd66bafd777147610cdd7ca9e2910a1b420609c958b2f8735df6a6f1", kill_on_drop: false }`
[INFO] [stdout] c5156c39bd66bafd777147610cdd7ca9e2910a1b420609c958b2f8735df6a6f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-68/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2fda32ef0c757e988e1cda8b784ce553bb64a0d046b20cd8565646212b9177cf
[INFO] running `Command { std: "docker" "start" "-a" "2fda32ef0c757e988e1cda8b784ce553bb64a0d046b20cd8565646212b9177cf", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v0.4.30
[INFO] [stderr]    Compiling unicode-xid v0.1.0
[INFO] [stderr]    Compiling libc v0.2.58
[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 lazy_static v1.3.0
[INFO] [stderr]     Checking strfmt v0.1.6
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking time v0.1.42
[INFO] [stderr]    Compiling quote v0.6.12
[INFO] [stderr]     Checking toml v0.4.10
[INFO] [stderr]    Compiling serde_derive v1.0.94
[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 --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-381b96bbd07c50ac.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-a5b471c73825413d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-6eb88668233b2a0b.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-9551b0153cdb2659.so --extern strfmt=/opt/rustwide/target/debug/deps/libstrfmt-f835ba29bf876bb9.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-b93f3c93fefd9f87.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-c59572edfea2b562.rmeta --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2fda32ef0c757e988e1cda8b784ce553bb64a0d046b20cd8565646212b9177cf", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2fda32ef0c757e988e1cda8b784ce553bb64a0d046b20cd8565646212b9177cf", kill_on_drop: false }`
[INFO] [stdout] 2fda32ef0c757e988e1cda8b784ce553bb64a0d046b20cd8565646212b9177cf
