[INFO] cloning repository https://github.com/GreeFine/adventofcode-2021
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/GreeFine/adventofcode-2021" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGreeFine%2Fadventofcode-2021", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGreeFine%2Fadventofcode-2021'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 0561f319fb74b714acf1d8e83010621fdbaf3bf2
[INFO] documenting GreeFine/adventofcode-2021 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FGreeFine%2Fadventofcode-2021" "/workspace/builds/worker-30/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-30/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/GreeFine/adventofcode-2021 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 git repo https://github.com/GreeFine/adventofcode-2021
[INFO] finished tweaking git repo https://github.com/GreeFine/adventofcode-2021
[INFO] tweaked toml for git repo https://github.com/GreeFine/adventofcode-2021 written to /workspace/builds/worker-30/source/Cargo.toml
[INFO] crate git repo https://github.com/GreeFine/adventofcode-2021 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] 2aaef3ad3e1a81e95585da08679eeab857c3a0f4f20c22129c2cbae1a38221ed
[INFO] running `Command { std: "docker" "start" "-a" "2aaef3ad3e1a81e95585da08679eeab857c3a0f4f20c22129c2cbae1a38221ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2aaef3ad3e1a81e95585da08679eeab857c3a0f4f20c22129c2cbae1a38221ed", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2aaef3ad3e1a81e95585da08679eeab857c3a0f4f20c22129c2cbae1a38221ed", kill_on_drop: false }`
[INFO] [stdout] 2aaef3ad3e1a81e95585da08679eeab857c3a0f4f20c22129c2cbae1a38221ed
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-30/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] 1876f7b1a1628bf08c1af4eefaa104dfb4215c61f377eddff4c6895cc226f26c
[INFO] running `Command { std: "docker" "start" "-a" "1876f7b1a1628bf08c1af4eefaa104dfb4215c61f377eddff4c6895cc226f26c", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.32
[INFO] [stderr]    Compiling unicode-xid v0.2.2
[INFO] [stderr]    Compiling rustversion v1.0.5
[INFO] [stderr]    Compiling syn v1.0.82
[INFO] [stderr]    Compiling unicode-segmentation v1.8.0
[INFO] [stderr]    Compiling heck v0.3.3
[INFO] [stderr]    Compiling quote v1.0.10
[INFO] [stderr]    Compiling strum_macros v0.23.1
[INFO] [stderr]     Checking strum v0.23.0
[INFO] [stderr]  Documenting adventofcode v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(default_free_fn)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `adventofcode`
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2021 --crate-type bin --crate-name adventofcode src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=8a3be43fe6b82bac -L dependency=/opt/rustwide/target/debug/deps --extern strum=/opt/rustwide/target/debug/deps/libstrum-df6ac950405e9275.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1876f7b1a1628bf08c1af4eefaa104dfb4215c61f377eddff4c6895cc226f26c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1876f7b1a1628bf08c1af4eefaa104dfb4215c61f377eddff4c6895cc226f26c", kill_on_drop: false }`
[INFO] [stdout] 1876f7b1a1628bf08c1af4eefaa104dfb4215c61f377eddff4c6895cc226f26c