[INFO] fetching crate hp-log 0.3.1...
[INFO] documenting hp-log-0.3.1 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate hp-log 0.3.1 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate hp-log 0.3.1 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "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-6-tc1/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: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded redox_syscall v0.1.54
[INFO] [stderr]   Downloaded quote v0.6.12
[INFO] [stderr]   Downloaded cfg-if v0.1.9
[INFO] [stderr]   Downloaded log v0.4.6
[INFO] [stderr]   Downloaded cc v1.0.37
[INFO] [stderr]   Downloaded wincolor v1.0.1
[INFO] [stderr]   Downloaded winapi-util v0.1.2
[INFO] [stderr]   Downloaded serde v1.0.94
[INFO] [stderr]   Downloaded syn v0.15.39
[INFO] [stderr]   Downloaded serde_derive v1.0.94
[INFO] [stderr]   Downloaded strfmt v0.1.6
[INFO] [stderr]   Downloaded libc v0.2.58
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ed77934d4f3eeb7ae93349949ff0e9134ecd17f0863988aba5a7e061868b85b6
[INFO] running `Command { std: "docker" "start" "-a" "ed77934d4f3eeb7ae93349949ff0e9134ecd17f0863988aba5a7e061868b85b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ed77934d4f3eeb7ae93349949ff0e9134ecd17f0863988aba5a7e061868b85b6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ed77934d4f3eeb7ae93349949ff0e9134ecd17f0863988aba5a7e061868b85b6", kill_on_drop: false }`
[INFO] [stdout] ed77934d4f3eeb7ae93349949ff0e9134ecd17f0863988aba5a7e061868b85b6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] df1eb73094a5aba7ac491c1957ad3bd6b099c58af87b323a310d20ad399e69b9
[INFO] running `Command { std: "docker" "start" "-a" "df1eb73094a5aba7ac491c1957ad3bd6b099c58af87b323a310d20ad399e69b9", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.58
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling quote v0.6.12
[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 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 stable 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: aborting due to previous error
[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=4240f3f2112cf904 -L dependency=/opt/rustwide/target/debug/deps --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-a90a3effa80b38c9.rmeta --extern log=/opt/rustwide/target/debug/deps/liblog-f847457a0ce24dd2.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-795222480a5332ff.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-2d3f20af11509b2d.so --extern strfmt=/opt/rustwide/target/debug/deps/libstrfmt-3b0d13bcab6b2227.rmeta --extern time=/opt/rustwide/target/debug/deps/libtime-70dbd38789cdf793.rmeta --extern toml=/opt/rustwide/target/debug/deps/libtoml-16548f84da3c7ea1.rmeta --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "df1eb73094a5aba7ac491c1957ad3bd6b099c58af87b323a310d20ad399e69b9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "df1eb73094a5aba7ac491c1957ad3bd6b099c58af87b323a310d20ad399e69b9", kill_on_drop: false }`
[INFO] [stdout] df1eb73094a5aba7ac491c1957ad3bd6b099c58af87b323a310d20ad399e69b9
