[INFO] fetching crate cargo-errorbook 0.0.2...
[INFO] documenting cargo-errorbook-0.0.2 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate cargo-errorbook 0.0.2 into /workspace/builds/worker-73/source
[INFO] validating manifest of crates.io crate cargo-errorbook 0.0.2 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate cargo-errorbook 0.0.2
[INFO] finished tweaking crates.io crate cargo-errorbook 0.0.2
[INFO] tweaked toml for crates.io crate cargo-errorbook 0.0.2 written to /workspace/builds/worker-73/source/Cargo.toml
[INFO] crate crates.io crate cargo-errorbook 0.0.2 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d204f3da154b45e3478990f75ed62ba9fe8bcccfd2e31b781d8c0b3e78f3ff22
[INFO] running `Command { std: "docker" "start" "-a" "d204f3da154b45e3478990f75ed62ba9fe8bcccfd2e31b781d8c0b3e78f3ff22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d204f3da154b45e3478990f75ed62ba9fe8bcccfd2e31b781d8c0b3e78f3ff22", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d204f3da154b45e3478990f75ed62ba9fe8bcccfd2e31b781d8c0b3e78f3ff22", kill_on_drop: false }`
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-73/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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a8bafac2ca922eb151c4933623212e5fc0a0284b3478f9c52ad6ff26e34ac14
[INFO] running `Command { std: "docker" "start" "-a" "8a8bafac2ca922eb151c4933623212e5fc0a0284b3478f9c52ad6ff26e34ac14", kill_on_drop: false }`
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[INFO] [stderr]  Documenting cargo-errorbook v0.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(slice_group_by)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] error: could not document `cargo-errorbook`
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name cargo_errorbook src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=8a123d6ac45f7f1c -L dependency=/opt/rustwide/target/debug/deps --extern cargo_metadata=/opt/rustwide/target/debug/deps/libcargo_metadata-45d554cd82321be0.rmeta --extern mdbook=/opt/rustwide/target/debug/deps/libmdbook-8f4c149bf9283f32.rmeta --extern webbrowser=/opt/rustwide/target/debug/deps/libwebbrowser-635885b9a463778f.rmeta --cap-lints=warn --crate-version 0.0.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8a8bafac2ca922eb151c4933623212e5fc0a0284b3478f9c52ad6ff26e34ac14", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a8bafac2ca922eb151c4933623212e5fc0a0284b3478f9c52ad6ff26e34ac14", kill_on_drop: false }`
[INFO] [stdout] 8a8bafac2ca922eb151c4933623212e5fc0a0284b3478f9c52ad6ff26e34ac14