[INFO] fetching crate bruteforce 0.2.0...
[INFO] documenting bruteforce-0.2.0 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate bruteforce 0.2.0 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate bruteforce 0.2.0 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 bruteforce 0.2.0
[INFO] finished tweaking crates.io crate bruteforce 0.2.0
[INFO] tweaked toml for crates.io crate bruteforce 0.2.0 written to /workspace/builds/worker-1/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 bruteforce-macros v0.2.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 5edaf00bb6d0b7055eac350f808a41ed628014d50268f120ece84255315d1eca
[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" "5edaf00bb6d0b7055eac350f808a41ed628014d50268f120ece84255315d1eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "5edaf00bb6d0b7055eac350f808a41ed628014d50268f120ece84255315d1eca", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "5edaf00bb6d0b7055eac350f808a41ed628014d50268f120ece84255315d1eca", kill_on_drop: false }`
[INFO] [stdout] 5edaf00bb6d0b7055eac350f808a41ed628014d50268f120ece84255315d1eca
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] 6a7af6e5260b7ff05cce944b7d3c8c2e45f1c8610410cc56e8de0f0bbf168338
[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" "6a7af6e5260b7ff05cce944b7d3c8c2e45f1c8610410cc56e8de0f0bbf168338", kill_on_drop: false }`
[INFO] [stderr]    Compiling no-std-compat v0.3.0
[INFO] [stderr]    Compiling bruteforce-macros v0.2.0
[INFO] [stderr]  Documenting bruteforce v0.2.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> src/lib.rs:4:1
[INFO] [stdout]    |
[INFO] [stdout] 4  | / #![feature(
[INFO] [stdout] 5  | |     const_fn,
[INFO] [stdout] 6  | |     test,
[INFO] [stdout] 7  | |     generators,
[INFO] [stdout] ...  |
[INFO] [stdout] 11 | |     proc_macro_hygiene
[INFO] [stdout] 12 | | )]
[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 `bruteforce`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name bruteforce src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="bruteforce-macros"' --cfg 'feature="constants"' --cfg 'feature="default"' --cfg 'feature="std"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bruteforce_macros=/opt/rustwide/target/debug/deps/libbruteforce_macros-7ffcb81d959025ef.so --extern no_std_compat=/opt/rustwide/target/debug/deps/libno_std_compat-b35da3167e193d26.rmeta --cap-lints=warn --crate-version 0.2.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "6a7af6e5260b7ff05cce944b7d3c8c2e45f1c8610410cc56e8de0f0bbf168338", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "6a7af6e5260b7ff05cce944b7d3c8c2e45f1c8610410cc56e8de0f0bbf168338", kill_on_drop: false }`
[INFO] [stdout] 6a7af6e5260b7ff05cce944b7d3c8c2e45f1c8610410cc56e8de0f0bbf168338