[INFO] fetching crate blissb 0.2.3...
[INFO] documenting blissb-0.2.3 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate blissb 0.2.3 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate blissb 0.2.3 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 blissb 0.2.3
[INFO] finished tweaking crates.io crate blissb 0.2.3
[INFO] tweaked toml for crates.io crate blissb 0.2.3 written to /workspace/builds/worker-0/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 bitpack v0.2.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 1e9d7ccfe699eedfa4de6ac145a66464a69c90977fc57b28c8b874bc95d495a6
[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" "1e9d7ccfe699eedfa4de6ac145a66464a69c90977fc57b28c8b874bc95d495a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1e9d7ccfe699eedfa4de6ac145a66464a69c90977fc57b28c8b874bc95d495a6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e9d7ccfe699eedfa4de6ac145a66464a69c90977fc57b28c8b874bc95d495a6", kill_on_drop: false }`
[INFO] [stdout] 1e9d7ccfe699eedfa4de6ac145a66464a69c90977fc57b28c8b874bc95d495a6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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] 27eaaa2e0b58bab9aa70467024b5bc2190d7d6a6b5e9addc56064d32e23fa5d7
[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" "27eaaa2e0b58bab9aa70467024b5bc2190d7d6a6b5e9addc56064d32e23fa5d7", kill_on_drop: false }`
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking bitpack v0.2.1
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]  Documenting blissb v0.2.3 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_step_by)]
[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 `blissb`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type lib --crate-name blissb src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="i"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern bitpack=/opt/rustwide/target/debug/deps/libbitpack-3171cebefd819867.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-364c148656283980.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-c42c7071001c27f2.rmeta --extern tiny_keccak=/opt/rustwide/target/debug/deps/libtiny_keccak-ec2e68e6688dadfb.rmeta --cap-lints=warn --crate-version 0.2.3` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "27eaaa2e0b58bab9aa70467024b5bc2190d7d6a6b5e9addc56064d32e23fa5d7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "27eaaa2e0b58bab9aa70467024b5bc2190d7d6a6b5e9addc56064d32e23fa5d7", kill_on_drop: false }`
[INFO] [stdout] 27eaaa2e0b58bab9aa70467024b5bc2190d7d6a6b5e9addc56064d32e23fa5d7