[INFO] fetching crate unik 0.2.6...
[INFO] documenting unik-0.2.6 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate unik 0.2.6 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate unik 0.2.6 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 unik 0.2.6
[INFO] finished tweaking crates.io crate unik 0.2.6
[INFO] tweaked toml for crates.io crate unik 0.2.6 written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "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] [stdout] 1ce93488f0ba0f43a3e37c91cf70861619696d4fc7c1ab8627919417127bfbdc
[INFO] running `Command { std: "docker" "start" "-a" "1ce93488f0ba0f43a3e37c91cf70861619696d4fc7c1ab8627919417127bfbdc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ce93488f0ba0f43a3e37c91cf70861619696d4fc7c1ab8627919417127bfbdc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ce93488f0ba0f43a3e37c91cf70861619696d4fc7c1ab8627919417127bfbdc", kill_on_drop: false }`
[INFO] [stdout] 1ce93488f0ba0f43a3e37c91cf70861619696d4fc7c1ab8627919417127bfbdc
[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" "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] [stdout] e3758bd94e073c9d67a7b9d6d717de9f5ac18f12dda62a0d77546dc389569f96
[INFO] running `Command { std: "docker" "start" "-a" "e3758bd94e073c9d67a7b9d6d717de9f5ac18f12dda62a0d77546dc389569f96", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]     Checking bitflags v1.3.2
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]     Checking nanorand v0.6.1
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]     Checking time v0.1.44
[INFO] [stderr]     Checking nix v0.23.1
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking mac_address v1.1.3
[INFO] [stderr]  Documenting unik v0.2.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:9:1
[INFO] [stdout]   |
[INFO] [stdout] 9 | #![feature(doc_cfg)]
[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 `unik`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type lib --crate-name unik src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="chrono"' --cfg 'feature="default"' --cfg 'feature="mac_address"' --cfg 'feature="nanorand"' --cfg 'feature="v1"' --cfg 'feature="v4"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=e1f914aa0c4e4a20 -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-65d0da1f7137d0cf.rmeta --extern mac_address=/opt/rustwide/target/debug/deps/libmac_address-16875be02444d6d4.rmeta --extern nanorand=/opt/rustwide/target/debug/deps/libnanorand-d10184114ba3eef7.rmeta --cap-lints=warn --crate-version 0.2.6` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e3758bd94e073c9d67a7b9d6d717de9f5ac18f12dda62a0d77546dc389569f96", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e3758bd94e073c9d67a7b9d6d717de9f5ac18f12dda62a0d77546dc389569f96", kill_on_drop: false }`
[INFO] [stdout] e3758bd94e073c9d67a7b9d6d717de9f5ac18f12dda62a0d77546dc389569f96