[INFO] fetching crate rpa_enum 0.1.6...
[INFO] documenting rpa_enum-0.1.6 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate rpa_enum 0.1.6 into /workspace/builds/worker-7-tc1/source
[INFO] validating manifest of crates.io crate rpa_enum 0.1.6 on toolchain 1.75.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate rpa_enum 0.1.6
[INFO] finished tweaking crates.io crate rpa_enum 0.1.6
[INFO] tweaked toml for crates.io crate rpa_enum 0.1.6 written to /workspace/builds/worker-7-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.75.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ef7c47c174d543e4ee8e95fd6fbe7aa6ecf7f3095d79b032f0ddc05ec710b5d
[INFO] running `Command { std: "docker" "start" "-a" "1ef7c47c174d543e4ee8e95fd6fbe7aa6ecf7f3095d79b032f0ddc05ec710b5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ef7c47c174d543e4ee8e95fd6fbe7aa6ecf7f3095d79b032f0ddc05ec710b5d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ef7c47c174d543e4ee8e95fd6fbe7aa6ecf7f3095d79b032f0ddc05ec710b5d", kill_on_drop: false }`
[INFO] [stdout] 1ef7c47c174d543e4ee8e95fd6fbe7aa6ecf7f3095d79b032f0ddc05ec710b5d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.75.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e7a93759a47e8c892ba79b9d82772aed8c45acec06c5e1a9ad5afbd33d83bccb
[INFO] running `Command { std: "docker" "start" "-a" "e7a93759a47e8c892ba79b9d82772aed8c45acec06c5e1a9ad5afbd33d83bccb", kill_on_drop: false }`
[INFO] [stderr]     Checking memchr v2.7.1
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]     Checking unicode-ident v1.0.12
[INFO] [stderr]    Compiling syn v1.0.109
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking regex-automata v0.4.3
[INFO] [stderr]     Checking regex v1.10.2
[INFO] [stderr]     Checking Inflector v0.11.4
[INFO] [stderr]  Documenting rpa_enum v0.1.6 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:1
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(proc_macro_hygiene, decl_macro)]
[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 `rpa_enum`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `/opt/rustwide/rustup-home/toolchains/1.75.0-x86_64-unknown-linux-gnu/bin/rustdoc --edition=2018 --crate-type proc-macro --crate-name rpa_enum src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b913a5f82743cd4f -L dependency=/opt/rustwide/target/debug/deps --extern inflector=/opt/rustwide/target/debug/deps/libinflector-b74208ef78e34308.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-3889f6209a44556f.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-b5c91c32bf6deb64.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-82df1375c9560a74.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.1.6` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e7a93759a47e8c892ba79b9d82772aed8c45acec06c5e1a9ad5afbd33d83bccb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e7a93759a47e8c892ba79b9d82772aed8c45acec06c5e1a9ad5afbd33d83bccb", kill_on_drop: false }`
[INFO] [stdout] e7a93759a47e8c892ba79b9d82772aed8c45acec06c5e1a9ad5afbd33d83bccb
