[INFO] fetching crate lilos 0.2.1...
[INFO] documenting lilos-0.2.1 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate lilos 0.2.1 into /workspace/builds/worker-61/source
[INFO] validating manifest of crates.io crate lilos 0.2.1 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate lilos 0.2.1
[INFO] finished tweaking crates.io crate lilos 0.2.1
[INFO] tweaked toml for crates.io crate lilos 0.2.1 written to /workspace/builds/worker-61/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1ff4567de8d0ee342b28821d7b0384197b8340efb1c9f45bf70c40774a54f909
[INFO] running `Command { std: "docker" "start" "-a" "1ff4567de8d0ee342b28821d7b0384197b8340efb1c9f45bf70c40774a54f909", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1ff4567de8d0ee342b28821d7b0384197b8340efb1c9f45bf70c40774a54f909", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1ff4567de8d0ee342b28821d7b0384197b8340efb1c9f45bf70c40774a54f909", kill_on_drop: false }`
[INFO] [stdout] 1ff4567de8d0ee342b28821d7b0384197b8340efb1c9f45bf70c40774a54f909
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-61/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d9aa6c00b0aa87f0212e0e80a17ad3417841753b57fd35acbf8f99c603a8a623
[INFO] running `Command { std: "docker" "start" "-a" "d9aa6c00b0aa87f0212e0e80a17ad3417841753b57fd35acbf8f99c603a8a623", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling syn v1.0.74
[INFO] [stderr]    Compiling futures-core v0.3.16
[INFO] [stderr]    Compiling futures-task v0.3.16
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking futures-sink v0.3.16
[INFO] [stderr]    Compiling futures-channel v0.3.16
[INFO] [stderr]    Compiling cortex-m-rt v0.6.15
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]     Checking futures-io v0.3.16
[INFO] [stderr]    Compiling futures-macro v0.3.16
[INFO] [stderr]    Compiling futures-util v0.3.16
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.6.15
[INFO] [stderr]     Checking futures v0.3.16
[INFO] [stderr]  Documenting lilos v0.2.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:90:1
[INFO] [stdout]    |
[INFO] [stdout] 90 | #![feature(never_type)]
[INFO] [stdout]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: Compilation failed, aborting rustdoc
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 2 previous errors
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] [stderr] error: could not document `lilos`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name lilos src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="handoff"' --cfg 'feature="mutex"' --cfg 'feature="scopeguard"' --cfg 'feature="spsc"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-feef562547d4a42d.rmeta --extern cortex_m_rt=/opt/rustwide/target/debug/deps/libcortex_m_rt-8e87436535003bb2.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-ee5f2d56d4fee248.rmeta --extern pin_utils=/opt/rustwide/target/debug/deps/libpin_utils-7739f27f2950f8bd.rmeta --extern scopeguard=/opt/rustwide/target/debug/deps/libscopeguard-6a5ef8f282e82a80.rmeta --cap-lints=warn --crate-version 0.2.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "d9aa6c00b0aa87f0212e0e80a17ad3417841753b57fd35acbf8f99c603a8a623", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9aa6c00b0aa87f0212e0e80a17ad3417841753b57fd35acbf8f99c603a8a623", kill_on_drop: false }`
[INFO] [stdout] d9aa6c00b0aa87f0212e0e80a17ad3417841753b57fd35acbf8f99c603a8a623
