[INFO] fetching crate lcpc-brakedown-pc 0.1.0...
[INFO] documenting lcpc-brakedown-pc-0.1.0 against 1.61.0 for beta-1.62-rustdoc-1
[INFO] extracting crate lcpc-brakedown-pc 0.1.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate lcpc-brakedown-pc 0.1.0 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 lcpc-brakedown-pc 0.1.0
[INFO] finished tweaking crates.io crate lcpc-brakedown-pc 0.1.0
[INFO] tweaked toml for crates.io crate lcpc-brakedown-pc 0.1.0 written to /workspace/builds/worker-7/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 sprs v0.10.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 4e6c790fecc245c4c059b18f97db588771034286dc942830e8eea0e64da47476
[INFO] running `Command { std: "docker" "start" "-a" "4e6c790fecc245c4c059b18f97db588771034286dc942830e8eea0e64da47476", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4e6c790fecc245c4c059b18f97db588771034286dc942830e8eea0e64da47476", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4e6c790fecc245c4c059b18f97db588771034286dc942830e8eea0e64da47476", kill_on_drop: false }`
[INFO] [stdout] 4e6c790fecc245c4c059b18f97db588771034286dc942830e8eea0e64da47476
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 339d7cca70552fd87ca53b6ff382217fafcb30099a27ef454424b8b8e652a3ec
[INFO] running `Command { std: "docker" "start" "-a" "339d7cca70552fd87ca53b6ff382217fafcb30099a27ef454424b8b8e652a3ec", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling autocfg v1.1.0
[INFO] [stderr]    Compiling libm v0.2.2
[INFO] [stderr]    Compiling proc-macro2 v1.0.39
[INFO] [stderr]    Compiling unicode-ident v1.0.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling libc v0.2.126
[INFO] [stderr]    Compiling syn v1.0.95
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling crossbeam-utils v0.8.8
[INFO] [stderr]    Compiling rustversion v1.0.6
[INFO] [stderr]    Compiling unicode-xid v0.2.3
[INFO] [stderr]     Checking scopeguard v1.1.0
[INFO] [stderr]    Compiling rayon-core v1.9.3
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling serde_derive v1.0.137
[INFO] [stderr]    Compiling typenum v1.15.0
[INFO] [stderr]    Compiling radium v0.6.2
[INFO] [stderr]     Checking either v1.6.1
[INFO] [stderr]    Compiling serde v1.0.137
[INFO] [stderr]     Checking tap v1.0.1
[INFO] [stderr]    Compiling ndarray v0.14.0
[INFO] [stderr]     Checking funty v1.2.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.16
[INFO] [stderr]     Checking rawpointer v0.2.1
[INFO] [stderr]     Checking byteorder v1.4.3
[INFO] [stderr]     Checking keccak v0.1.2
[INFO] [stderr]     Checking subtle v2.4.1
[INFO] [stderr]     Checking smallvec v1.8.0
[INFO] [stderr]     Checking matrixmultiply v0.2.4
[INFO] [stderr]     Checking itertools v0.10.3
[INFO] [stderr]     Checking wyz v0.4.0
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling generic-array v0.14.5
[INFO] [stderr]    Compiling num-traits v0.2.15
[INFO] [stderr]    Compiling num-integer v0.1.45
[INFO] [stderr]    Compiling memoffset v0.6.5
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.8
[INFO] [stderr]    Compiling num-bigint v0.3.3
[INFO] [stderr]    Compiling rayon v1.5.3
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]     Checking bitvec v0.22.3
[INFO] [stderr]     Checking crossbeam-channel v0.5.4
[INFO] [stderr]    Compiling quote v1.0.18
[INFO] [stderr]     Checking getrandom v0.2.6
[INFO] [stderr]     Checking num_cpus v1.13.1
[INFO] [stderr]     Checking rand_core v0.6.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling err-derive v0.2.4
[INFO] [stderr]     Checking rand_chacha v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.8.1
[INFO] [stderr]     Checking rand v0.8.5
[INFO] [stderr]     Checking digest v0.9.0
[INFO] [stderr]     Checking approx v0.3.2
[INFO] [stderr]     Checking num-complex v0.3.1
[INFO] [stderr]    Compiling synstructure v0.12.6
[INFO] [stderr]     Checking alga v0.9.3
[INFO] [stderr]    Compiling zeroize_derive v1.3.2
[INFO] [stderr]    Compiling addchain v0.2.0
[INFO] [stderr]    Compiling ff_derive v0.10.0
[INFO] [stderr]     Checking sprs v0.10.0
[INFO] [stderr]     Checking zeroize v1.5.5
[INFO] [stderr]     Checking merlin v2.0.1
[INFO] [stderr]     Checking ff v0.10.1
[INFO] [stderr]     Checking serde_bytes v0.11.6
[INFO] [stderr]     Checking lcpc-2d v0.1.0
[INFO] [stderr]  Documenting lcpc-brakedown-pc v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:15:12
[INFO] [stdout]    |
[INFO] [stdout] 15 | #![feature(test)]
[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 `lcpc-brakedown-pc`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name lcpc_brakedown_pc src/lib.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=178dd44f264fcb36 -L dependency=/opt/rustwide/target/debug/deps --extern ff=/opt/rustwide/target/debug/deps/libff-9fb24907adcaa5d2.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-c3e915a3b5e36158.rmeta --extern lcpc_2d=/opt/rustwide/target/debug/deps/liblcpc_2d-40da206b27d916bc.rmeta --extern ndarray=/opt/rustwide/target/debug/deps/libndarray-bbb25691e139a3e2.rmeta --extern num_traits=/opt/rustwide/target/debug/deps/libnum_traits-f28866b29a19d907.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-54d278ef73dbc208.rmeta --extern rand_chacha=/opt/rustwide/target/debug/deps/librand_chacha-ebd76155a1041003.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-6ff852cd68f4dcba.rmeta --extern sprs=/opt/rustwide/target/debug/deps/libsprs-079a71b9ff233469.rmeta --extern typenum=/opt/rustwide/target/debug/deps/libtypenum-d5d797e647ec61d1.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "339d7cca70552fd87ca53b6ff382217fafcb30099a27ef454424b8b8e652a3ec", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "339d7cca70552fd87ca53b6ff382217fafcb30099a27ef454424b8b8e652a3ec", kill_on_drop: false }`
[INFO] [stdout] 339d7cca70552fd87ca53b6ff382217fafcb30099a27ef454424b8b8e652a3ec