[INFO] fetching crate blissb 0.2.3...
[INFO] documenting blissb-0.2.3 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate blissb 0.2.3 into /workspace/builds/worker-74/source
[INFO] validating manifest of crates.io crate blissb 0.2.3 on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", 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-74/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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-74/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-74/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c2baa94b5625d74b7fc31deba0cd1573ab1840dff0d69684de73e7966d6e8d54
[INFO] running `Command { std: "docker" "start" "-a" "c2baa94b5625d74b7fc31deba0cd1573ab1840dff0d69684de73e7966d6e8d54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c2baa94b5625d74b7fc31deba0cd1573ab1840dff0d69684de73e7966d6e8d54", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c2baa94b5625d74b7fc31deba0cd1573ab1840dff0d69684de73e7966d6e8d54", kill_on_drop: false }`
[INFO] [stdout] c2baa94b5625d74b7fc31deba0cd1573ab1840dff0d69684de73e7966d6e8d54
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-74/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-74/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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 619df175091aef3360519ad3128a955486752a4aa9fddcbcd925178b5100e144
[INFO] running `Command { std: "docker" "start" "-a" "619df175091aef3360519ad3128a955486752a4aa9fddcbcd925178b5100e144", kill_on_drop: false }`
[INFO] [stderr]    Compiling crunchy v0.2.2
[INFO] [stderr]     Checking bitpack v0.2.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking rand v0.4.6
[INFO] [stderr]     Checking tiny-keccak v1.5.0
[INFO] [stderr]     Checking rand v0.3.23
[INFO] [stderr]  Documenting blissb v0.2.3 (/opt/rustwide/workdir)
[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,artifacts,future-incompat --document-private-items -C metadata=b45c1efc69d41679 -L dependency=/opt/rustwide/target/debug/deps --extern bitpack=/opt/rustwide/target/debug/deps/libbitpack-7880c04dbfede371.rmeta --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-7c274f399d426ec2.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-8c59ebd94109a87b.rmeta --extern tiny_keccak=/opt/rustwide/target/debug/deps/libtiny_keccak-c0867e2891fca60f.rmeta --cap-lints=warn --crate-version 0.2.3` (exit status: 1)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/lib.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(iterator_step_by)]
[INFO] [stdout]   |            ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to previous error
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] For more information about this error, try `rustc --explain E0554`.
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "619df175091aef3360519ad3128a955486752a4aa9fddcbcd925178b5100e144", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "619df175091aef3360519ad3128a955486752a4aa9fddcbcd925178b5100e144", kill_on_drop: false }`
[INFO] [stdout] 619df175091aef3360519ad3128a955486752a4aa9fddcbcd925178b5100e144