[INFO] fetching crate guff-matrix 0.1.12...
[INFO] documenting guff-matrix-0.1.12 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate guff-matrix 0.1.12 into /workspace/builds/worker-8/source
[INFO] validating manifest of crates.io crate guff-matrix 0.1.12 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 guff-matrix 0.1.12
[INFO] finished tweaking crates.io crate guff-matrix 0.1.12
[INFO] tweaked toml for crates.io crate guff-matrix 0.1.12 written to /workspace/builds/worker-8/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] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "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] 3344e8b1c7f512bceea193a2b189f680f2a237a63d6e2c6535de722df1ca4f55
[INFO] running `Command { std: "docker" "start" "-a" "3344e8b1c7f512bceea193a2b189f680f2a237a63d6e2c6535de722df1ca4f55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3344e8b1c7f512bceea193a2b189f680f2a237a63d6e2c6535de722df1ca4f55", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3344e8b1c7f512bceea193a2b189f680f2a237a63d6e2c6535de722df1ca4f55", kill_on_drop: false }`
[INFO] [stdout] 3344e8b1c7f512bceea193a2b189f680f2a237a63d6e2c6535de722df1ca4f55
[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" "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] 1fbad83973f0dc26e2fd7057de099ff5b8d284f80a5cc99946860ae3077aa7ec
[INFO] running `Command { std: "docker" "start" "-a" "1fbad83973f0dc26e2fd7057de099ff5b8d284f80a5cc99946860ae3077aa7ec", kill_on_drop: false }`
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]     Checking num-integer v0.1.45
[INFO] [stderr]     Checking num-complex v0.4.1
[INFO] [stderr]     Checking num-bigint v0.4.3
[INFO] [stderr]     Checking num-iter v0.1.43
[INFO] [stderr]     Checking num-rational v0.4.0
[INFO] [stderr]     Checking num v0.4.0
[INFO] [stderr]     Checking guff v0.1.7
[INFO] [stderr]  Documenting guff-matrix v0.1.12 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:53:12
[INFO] [stdout]    |
[INFO] [stdout] 53 | #![feature(stdsimd)]
[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] [stderr] error: could not document `guff-matrix`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name guff_matrix src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=ec724d39cfd734ad -L dependency=/opt/rustwide/target/debug/deps --extern guff=/opt/rustwide/target/debug/deps/libguff-3c309ab26d0250a6.rmeta --cap-lints=warn --crate-version 0.1.12` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "1fbad83973f0dc26e2fd7057de099ff5b8d284f80a5cc99946860ae3077aa7ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1fbad83973f0dc26e2fd7057de099ff5b8d284f80a5cc99946860ae3077aa7ec", kill_on_drop: false }`
[INFO] [stdout] 1fbad83973f0dc26e2fd7057de099ff5b8d284f80a5cc99946860ae3077aa7ec