[INFO] cloning repository https://github.com/cybermatt/fast-luhn
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cybermatt/fast-luhn" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcybermatt%2Ffast-luhn", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcybermatt%2Ffast-luhn'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 3e0e61466d30166e95f4db15251c8e241c77ab29
[INFO] documenting cybermatt/fast-luhn against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcybermatt%2Ffast-luhn" "/workspace/builds/worker-32/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-32/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cybermatt/fast-luhn 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 git repo https://github.com/cybermatt/fast-luhn
[INFO] finished tweaking git repo https://github.com/cybermatt/fast-luhn
[INFO] tweaked toml for git repo https://github.com/cybermatt/fast-luhn written to /workspace/builds/worker-32/source/Cargo.toml
[INFO] crate git repo https://github.com/cybermatt/fast-luhn 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 pyo3cls v0.12.4
[INFO] [stderr]   Downloaded pyo3-derive-backend v0.12.4
[INFO] [stderr]   Downloaded indoc-impl v0.3.6
[INFO] [stderr]   Downloaded paste v0.1.18
[INFO] [stderr]   Downloaded parking_lot_core v0.8.1
[INFO] [stderr]   Downloaded ghost v0.1.2
[INFO] [stderr]   Downloaded inventory-impl v0.1.10
[INFO] [stderr]   Downloaded ctor v0.1.16
[INFO] [stderr]   Downloaded inventory v0.1.10
[INFO] [stderr]   Downloaded syn v1.0.54
[INFO] [stderr]   Downloaded smallvec v1.5.1
[INFO] [stderr]   Downloaded indoc v0.3.6
[INFO] [stderr]   Downloaded libc v0.2.81
[INFO] [stderr]   Downloaded paste-impl v0.1.18
[INFO] [stderr]   Downloaded unindent v0.1.7
[INFO] [stderr]   Downloaded pyo3 v0.12.4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] 1fd3da613ff840a01b8a18b7640f8665e1031446936e99066476d1590dcf95a7
[INFO] running `Command { std: "docker" "start" "-a" "1fd3da613ff840a01b8a18b7640f8665e1031446936e99066476d1590dcf95a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1fd3da613ff840a01b8a18b7640f8665e1031446936e99066476d1590dcf95a7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fd3da613ff840a01b8a18b7640f8665e1031446936e99066476d1590dcf95a7", kill_on_drop: false }`
[INFO] [stdout] 1fd3da613ff840a01b8a18b7640f8665e1031446936e99066476d1590dcf95a7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] b7267f162c16019b4662181ec88d755749d492fdf292e349451d66f48d5235f1
[INFO] running `Command { std: "docker" "start" "-a" "b7267f162c16019b4662181ec88d755749d492fdf292e349451d66f48d5235f1", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.54
[INFO] [stderr]    Compiling autocfg v0.1.2
[INFO] [stderr]    Compiling proc-macro-hack v0.5.19
[INFO] [stderr]    Compiling libc v0.2.81
[INFO] [stderr]    Compiling unindent v0.1.7
[INFO] [stderr]     Checking smallvec v1.5.1
[INFO] [stderr]    Compiling inventory v0.1.10
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling pyo3 v0.12.4
[INFO] [stderr]     Checking instant v0.1.9
[INFO] [stderr]     Checking rand_jitter v0.1.3
[INFO] [stderr]     Checking lock_api v0.4.2
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]    Compiling paste-impl v0.1.18
[INFO] [stderr]     Checking paste v0.1.18
[INFO] [stderr]     Checking parking_lot_core v0.8.1
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking parking_lot v0.11.1
[INFO] [stderr]    Compiling pyo3-derive-backend v0.12.4
[INFO] [stderr]    Compiling inventory-impl v0.1.10
[INFO] [stderr]    Compiling indoc-impl v0.3.6
[INFO] [stderr]    Compiling ctor v0.1.16
[INFO] [stderr]    Compiling ghost v0.1.2
[INFO] [stderr]    Compiling pyo3cls v0.12.4
[INFO] [stderr]     Checking indoc v0.3.6
[INFO] [stderr]  Documenting fast_luhn v0.1.5 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(specialization)]
[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 `fast_luhn`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type cdylib --crate-name fast_luhn 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 pyo3=/opt/rustwide/target/debug/deps/libpyo3-0208ca40b3859e19.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-fddbd35e7c9ca720.rmeta --cap-lints=warn --crate-version 0.1.5` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "b7267f162c16019b4662181ec88d755749d492fdf292e349451d66f48d5235f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b7267f162c16019b4662181ec88d755749d492fdf292e349451d66f48d5235f1", kill_on_drop: false }`
[INFO] [stdout] b7267f162c16019b4662181ec88d755749d492fdf292e349451d66f48d5235f1
