[INFO] fetching crate linked_list_allocator 0.9.1...
[INFO] documenting linked_list_allocator-0.9.1 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate linked_list_allocator 0.9.1 into /workspace/builds/worker-11/source
[INFO] validating manifest of crates.io crate linked_list_allocator 0.9.1 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] removed /workspace/builds/worker-11/source/rust-toolchain
[INFO] started tweaking crates.io crate linked_list_allocator 0.9.1
[INFO] finished tweaking crates.io crate linked_list_allocator 0.9.1
[INFO] tweaked toml for crates.io crate linked_list_allocator 0.9.1 written to /workspace/builds/worker-11/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-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] e236027bdab26fcdb8745463e72dfcbd32a9d0d4b9a13970aad5af09472c5004
[INFO] running `Command { std: "docker" "start" "-a" "e236027bdab26fcdb8745463e72dfcbd32a9d0d4b9a13970aad5af09472c5004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "e236027bdab26fcdb8745463e72dfcbd32a9d0d4b9a13970aad5af09472c5004", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e236027bdab26fcdb8745463e72dfcbd32a9d0d4b9a13970aad5af09472c5004", kill_on_drop: false }`
[INFO] [stdout] e236027bdab26fcdb8745463e72dfcbd32a9d0d4b9a13970aad5af09472c5004
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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] 5eefc1e4ebadd42b2233cd928b4fdc594e2b7ada40cd8281aa52211f4c19793f
[INFO] running `Command { std: "docker" "start" "-a" "5eefc1e4ebadd42b2233cd928b4fdc594e2b7ada40cd8281aa52211f4c19793f", kill_on_drop: false }`
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling lock_api v0.4.7
[INFO] [stderr]     Checking spinning_top v0.2.4
[INFO] [stderr]  Documenting linked_list_allocator v0.9.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:41
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![cfg_attr(feature = "const_mut_refs", feature(const_mut_refs))]
[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 `linked_list_allocator`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name linked_list_allocator src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="const_mut_refs"' --cfg 'feature="default"' --cfg 'feature="spinning_top"' --cfg 'feature="use_spin"' --cfg 'feature="use_spin_nightly"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=2fa9003f96bc5d3c -L dependency=/opt/rustwide/target/debug/deps --extern spinning_top=/opt/rustwide/target/debug/deps/libspinning_top-96da2ebb474a6e03.rmeta --cap-lints=warn --crate-version 0.9.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "5eefc1e4ebadd42b2233cd928b4fdc594e2b7ada40cd8281aa52211f4c19793f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5eefc1e4ebadd42b2233cd928b4fdc594e2b7ada40cd8281aa52211f4c19793f", kill_on_drop: false }`
[INFO] [stdout] 5eefc1e4ebadd42b2233cd928b4fdc594e2b7ada40cd8281aa52211f4c19793f