[INFO] fetching crate lilos 0.2.1...
[INFO] documenting lilos-0.2.1 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate lilos 0.2.1 into /workspace/builds/worker-31/source
[INFO] validating manifest of crates.io crate lilos 0.2.1 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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-31/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "+beta-2022-05-20" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 04d286e17548c424d944e341d7f7810df794864b83fdf5902a71bf9862da08c0
[INFO] running `Command { std: "docker" "start" "-a" "04d286e17548c424d944e341d7f7810df794864b83fdf5902a71bf9862da08c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "04d286e17548c424d944e341d7f7810df794864b83fdf5902a71bf9862da08c0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "04d286e17548c424d944e341d7f7810df794864b83fdf5902a71bf9862da08c0", kill_on_drop: false }`
[INFO] [stdout] 04d286e17548c424d944e341d7f7810df794864b83fdf5902a71bf9862da08c0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] e6373f517d25ac80edf148ed52b1098cd59541a63fff7cfd6c367daf0eb2eb8d
[INFO] running `Command { std: "docker" "start" "-a" "e6373f517d25ac80edf148ed52b1098cd59541a63fff7cfd6c367daf0eb2eb8d", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]    Compiling futures-core v0.3.21
[INFO] [stderr]    Compiling futures-task v0.3.21
[INFO] [stderr]    Compiling futures-util v0.3.21
[INFO] [stderr]     Checking futures-sink v0.3.21
[INFO] [stderr]     Checking nb v1.0.0
[INFO] [stderr]    Compiling futures-channel v0.3.21
[INFO] [stderr]     Checking vcell v0.1.3
[INFO] [stderr]    Compiling cortex-m v0.7.4
[INFO] [stderr]     Checking pin-project-lite v0.2.9
[INFO] [stderr]    Compiling cortex-m-rt v0.6.15
[INFO] [stderr]     Checking bitfield v0.13.2
[INFO] [stderr]     Checking r0 v0.2.2
[INFO] [stderr]     Checking futures-io v0.3.21
[INFO] [stderr]    Compiling bare-metal v0.2.5
[INFO] [stderr]     Checking volatile-register v0.2.1
[INFO] [stderr]     Checking nb v0.1.3
[INFO] [stderr]     Checking embedded-hal v0.2.7
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling futures-macro v0.3.21
[INFO] [stderr]    Compiling cortex-m-rt-macros v0.6.15
[INFO] [stderr]     Checking futures v0.3.21
[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,artifacts,future-incompat --document-private-items -C metadata=7c93b8f8c87534d3 -L dependency=/opt/rustwide/target/debug/deps --extern cortex_m=/opt/rustwide/target/debug/deps/libcortex_m-2dea0939445d8329.rmeta --extern cortex_m_rt=/opt/rustwide/target/debug/deps/libcortex_m_rt-fb77f1d2c4380cef.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-dd7560177ecc05c9.rmeta --extern pin_utils=/opt/rustwide/target/debug/deps/libpin_utils-c17bf529103421a9.rmeta --extern scopeguard=/opt/rustwide/target/debug/deps/libscopeguard-ab233328165cce6c.rmeta --cap-lints=warn --crate-version 0.2.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "e6373f517d25ac80edf148ed52b1098cd59541a63fff7cfd6c367daf0eb2eb8d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e6373f517d25ac80edf148ed52b1098cd59541a63fff7cfd6c367daf0eb2eb8d", kill_on_drop: false }`
[INFO] [stdout] e6373f517d25ac80edf148ed52b1098cd59541a63fff7cfd6c367daf0eb2eb8d