[INFO] fetching crate incinerator 0.0.1...
[INFO] documenting incinerator-0.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate incinerator 0.0.1 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate incinerator 0.0.1 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate incinerator 0.0.1
[INFO] finished tweaking crates.io crate incinerator 0.0.1
[INFO] tweaked toml for crates.io crate incinerator 0.0.1 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded nested v0.1.1
[INFO] [stderr]   Downloaded atomic_enum v0.1.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] a78368ed3cbbe8c77abca3bff77ab39b0334b972cc485a58e736b8f696ef1e2a
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "a78368ed3cbbe8c77abca3bff77ab39b0334b972cc485a58e736b8f696ef1e2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "a78368ed3cbbe8c77abca3bff77ab39b0334b972cc485a58e736b8f696ef1e2a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "a78368ed3cbbe8c77abca3bff77ab39b0334b972cc485a58e736b8f696ef1e2a", kill_on_drop: false }`
[INFO] [stdout] a78368ed3cbbe8c77abca3bff77ab39b0334b972cc485a58e736b8f696ef1e2a
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] af826737993666e23e7cd65d91f77968403f93aa4ed5e9a4f4ddc6cab0674438
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "af826737993666e23e7cd65d91f77968403f93aa4ed5e9a4f4ddc6cab0674438", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking nested v0.1.1
[INFO] [stderr]    Compiling atomic_enum v0.1.1
[INFO] [stderr]  Documenting incinerator v0.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | / #![feature(
[INFO] [stdout] 2 | |     alloc_layout_extra,
[INFO] [stdout] 3 | |     cell_update,
[INFO] [stdout] 4 | |     raw,
[INFO] [stdout] 5 | |     maybe_uninit_ref,
[INFO] [stdout] 6 | |     maybe_uninit_extra
[INFO] [stdout] 7 | | )]
[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 `incinerator`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name incinerator lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern atomic_enum=/opt/rustwide/target/debug/deps/libatomic_enum-458a9d1906ab4aa3.so --extern nested=/opt/rustwide/target/debug/deps/libnested-7c879fbec9c9698a.rmeta --extern once_cell=/opt/rustwide/target/debug/deps/libonce_cell-c30ce74baffcb5b9.rmeta --extern parking_lot=/opt/rustwide/target/debug/deps/libparking_lot-9971c8e565151e74.rmeta --extern thread_local=/opt/rustwide/target/debug/deps/libthread_local-b2caa685f224844b.rmeta --cap-lints=warn --crate-version 0.0.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "af826737993666e23e7cd65d91f77968403f93aa4ed5e9a4f4ddc6cab0674438", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "af826737993666e23e7cd65d91f77968403f93aa4ed5e9a4f4ddc6cab0674438", kill_on_drop: false }`
[INFO] [stdout] af826737993666e23e7cd65d91f77968403f93aa4ed5e9a4f4ddc6cab0674438