[INFO] fetching crate space-filling 0.3.1...
[INFO] documenting space-filling-0.3.1 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate space-filling 0.3.1 into /workspace/builds/worker-32/source
[INFO] validating manifest of crates.io crate space-filling 0.3.1 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 space-filling 0.3.1
[INFO] removed 0 missing examples
[INFO] finished tweaking crates.io crate space-filling 0.3.1
[INFO] tweaked toml for crates.io crate space-filling 0.3.1 written to /workspace/builds/worker-32/source/Cargo.toml
[INFO] crate crates.io crate space-filling 0.3.1 already has a lockfile, it will not be regenerated
[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]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded lexical-sort v0.3.1
[INFO] [stderr]   Downloaded any_ascii v0.1.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] ff7f8a8ec8572582be8d56ff31dbc4304e3200eb3e5854e722d07c1c409435c1
[INFO] running `Command { std: "docker" "start" "-a" "ff7f8a8ec8572582be8d56ff31dbc4304e3200eb3e5854e722d07c1c409435c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ff7f8a8ec8572582be8d56ff31dbc4304e3200eb3e5854e722d07c1c409435c1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ff7f8a8ec8572582be8d56ff31dbc4304e3200eb3e5854e722d07c1c409435c1", kill_on_drop: false }`
[INFO] [stdout] ff7f8a8ec8572582be8d56ff31dbc4304e3200eb3e5854e722d07c1c409435c1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-32/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] f3af46c3e23b6868fd14ab7a9ac3e83fd241d7ab07ee32d070c2ac8b821cb469
[INFO] running `Command { std: "docker" "start" "-a" "f3af46c3e23b6868fd14ab7a9ac3e83fd241d7ab07ee32d070c2ac8b821cb469", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.99
[INFO] [stderr]    Compiling crossbeam-utils v0.8.5
[INFO] [stderr]    Compiling memchr v2.4.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.5
[INFO] [stderr]    Compiling rayon-core v1.9.1
[INFO] [stderr]    Compiling cc v1.0.69
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]     Checking gimli v0.25.0
[INFO] [stderr]     Checking adler v1.0.2
[INFO] [stderr]     Checking rustc-demangle v0.1.20
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling memoffset v0.6.4
[INFO] [stderr]    Compiling miniz_oxide v0.4.4
[INFO] [stderr]    Compiling num-traits v0.2.14
[INFO] [stderr]    Compiling rayon v1.5.1
[INFO] [stderr]    Compiling error-chain v0.12.4
[INFO] [stderr]     Checking itertools v0.10.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.1
[INFO] [stderr]     Checking object v0.26.0
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]    Compiling backtrace v0.3.61
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking euclid v0.22.6
[INFO] [stderr]     Checking addr2line v0.16.0
[INFO] [stderr]  Documenting space-filling v0.3.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]    --> src/lib.rs:141:18
[INFO] [stdout]     |
[INFO] [stdout] 141 | #![cfg_attr(doc, feature(doc_cfg))]
[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 `space-filling`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name space_filling src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=7b04281b4aedf223 -L dependency=/opt/rustwide/target/debug/deps --extern error_chain=/opt/rustwide/target/debug/deps/liberror_chain-1705e4b03b243566.rmeta --extern euclid=/opt/rustwide/target/debug/deps/libeuclid-870b47f0f05ee7ac.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-768244cffa2ddad5.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-2cd290f5395ab79d.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-434c2ce053963223.rmeta --cap-lints=warn --crate-version 0.3.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "f3af46c3e23b6868fd14ab7a9ac3e83fd241d7ab07ee32d070c2ac8b821cb469", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f3af46c3e23b6868fd14ab7a9ac3e83fd241d7ab07ee32d070c2ac8b821cb469", kill_on_drop: false }`
[INFO] [stdout] f3af46c3e23b6868fd14ab7a9ac3e83fd241d7ab07ee32d070c2ac8b821cb469