[INFO] fetching crate docbot-derive 0.3.0-alpha.2...
[INFO] documenting docbot-derive-0.3.0-alpha.2 against 1.75.0 for beta-1.76-rustdoc-1
[INFO] extracting crate docbot-derive 0.3.0-alpha.2 into /workspace/builds/worker-1-tc1/source
[INFO] validating manifest of crates.io crate docbot-derive 0.3.0-alpha.2 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 docbot-derive 0.3.0-alpha.2
[INFO] finished tweaking crates.io crate docbot-derive 0.3.0-alpha.2
[INFO] tweaked toml for crates.io crate docbot-derive 0.3.0-alpha.2 written to /workspace/builds/worker-1-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-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 78017d7780ca09d4bfa8a0c69caaa568233ad14a08f87980a46aac76d906bbe6
[INFO] running `Command { std: "docker" "start" "-a" "78017d7780ca09d4bfa8a0c69caaa568233ad14a08f87980a46aac76d906bbe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "78017d7780ca09d4bfa8a0c69caaa568233ad14a08f87980a46aac76d906bbe6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "78017d7780ca09d4bfa8a0c69caaa568233ad14a08f87980a46aac76d906bbe6", kill_on_drop: false }`
[INFO] [stdout] 78017d7780ca09d4bfa8a0c69caaa568233ad14a08f87980a46aac76d906bbe6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1-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] 9b1ccea49c80235f3c7aa628c3bf9e9a77e7c1f09a9bd37b15f9bd59145e5b10
[INFO] running `Command { std: "docker" "start" "-a" "9b1ccea49c80235f3c7aa628c3bf9e9a77e7c1f09a9bd37b15f9bd59145e5b10", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.76
[INFO] [stderr]     Checking memchr v2.7.1
[INFO] [stderr]     Checking regex-syntax v0.8.2
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking anyhow v1.0.79
[INFO] [stderr]     Checking quote v1.0.35
[INFO] [stderr]     Checking aho-corasick v1.1.2
[INFO] [stderr]     Checking syn v1.0.109
[INFO] [stderr]     Checking regex-automata v0.4.3
[INFO] [stderr]     Checking regex v1.10.2
[INFO] [stderr]  Documenting docbot-derive v0.3.0-alpha.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> lib.rs:4:12
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![feature(proc_macro_diagnostic)]
[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 `docbot-derive`
[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=2021 --crate-type proc-macro --crate-name docbot_derive lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=5dd0c7c90a388d0c -L dependency=/opt/rustwide/target/debug/deps --extern anyhow=/opt/rustwide/target/debug/deps/libanyhow-5ff1c0ab4cad74ff.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-50d83f16c3a69fe4.rmeta --extern proc_macro2=/opt/rustwide/target/debug/deps/libproc_macro2-3889f6209a44556f.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-b5c91c32bf6deb64.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-256d061ba868d6ef.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-8ca102cd16ff575b.rmeta --extern proc_macro --cap-lints=warn --crate-version 0.3.0-alpha.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "9b1ccea49c80235f3c7aa628c3bf9e9a77e7c1f09a9bd37b15f9bd59145e5b10", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9b1ccea49c80235f3c7aa628c3bf9e9a77e7c1f09a9bd37b15f9bd59145e5b10", kill_on_drop: false }`
[INFO] [stdout] 9b1ccea49c80235f3c7aa628c3bf9e9a77e7c1f09a9bd37b15f9bd59145e5b10
