[INFO] fetching crate arc_new_cyclic_n 1.0.2...
[INFO] documenting arc_new_cyclic_n-1.0.2 against 1.69.0 for beta-1.70-rustdoc-1
[INFO] extracting crate arc_new_cyclic_n 1.0.2 into /workspace/builds/worker-4-tc1/source
[INFO] validating manifest of crates.io crate arc_new_cyclic_n 1.0.2 on toolchain 1.69.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arc_new_cyclic_n 1.0.2
[INFO] finished tweaking crates.io crate arc_new_cyclic_n 1.0.2
[INFO] tweaked toml for crates.io crate arc_new_cyclic_n 1.0.2 written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" __CARGO_TEST_CHANNEL_OVERRIDE_DO_NOT_USE_THIS="nightly" "/workspace/cargo-home/bin/cargo" "+1.69.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.69.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 69a8cf0c396923f3b3b684788b8cfec54aaec66987297b2de411c9c16cb79199
[INFO] running `Command { std: "docker" "start" "-a" "69a8cf0c396923f3b3b684788b8cfec54aaec66987297b2de411c9c16cb79199", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "69a8cf0c396923f3b3b684788b8cfec54aaec66987297b2de411c9c16cb79199", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "69a8cf0c396923f3b3b684788b8cfec54aaec66987297b2de411c9c16cb79199", kill_on_drop: false }`
[INFO] [stdout] 69a8cf0c396923f3b3b684788b8cfec54aaec66987297b2de411c9c16cb79199
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-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@sha256:5ff2268d62e97bff2cde7d5815dd6ed5b47097566f13b8d0ca110b04b60e07ed" "/opt/rustwide/cargo-home/bin/cargo" "+1.69.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 56b4697c4082c5f0b17705e298920a2e48067eda22016574b83201137a37adc5
[INFO] running `Command { std: "docker" "start" "-a" "56b4697c4082c5f0b17705e298920a2e48067eda22016574b83201137a37adc5", kill_on_drop: false }`
[INFO] [stderr]  Documenting arc_new_cyclic_n v1.0.2 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(arc_new_cyclic)]
[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 `arc_new_cyclic_n`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name arc_new_cyclic_n src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2fb2602c1b51fec6 -L dependency=/opt/rustwide/target/debug/deps --cap-lints=warn --crate-version 1.0.2` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "56b4697c4082c5f0b17705e298920a2e48067eda22016574b83201137a37adc5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "56b4697c4082c5f0b17705e298920a2e48067eda22016574b83201137a37adc5", kill_on_drop: false }`
[INFO] [stdout] 56b4697c4082c5f0b17705e298920a2e48067eda22016574b83201137a37adc5
