[INFO] fetching crate polars_arrow_rvsry99dx 0.17.1...
[INFO] documenting polars_arrow_rvsry99dx-0.17.1 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] extracting crate polars_arrow_rvsry99dx 0.17.1 into /workspace/builds/worker-3/source
[INFO] validating manifest of crates.io crate polars_arrow_rvsry99dx 0.17.1 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate polars_arrow_rvsry99dx 0.17.1
[INFO] finished tweaking crates.io crate polars_arrow_rvsry99dx 0.17.1
[INFO] tweaked toml for crates.io crate polars_arrow_rvsry99dx 0.17.1 written to /workspace/builds/worker-3/source/Cargo.toml
[INFO] crate crates.io crate polars_arrow_rvsry99dx 0.17.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 9bc6ebf7230212b874ebc4514f46b622e5e6120e82c4f835276d78d02dbd4fba
[INFO] running `Command { std: "docker" "start" "-a" "9bc6ebf7230212b874ebc4514f46b622e5e6120e82c4f835276d78d02dbd4fba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9bc6ebf7230212b874ebc4514f46b622e5e6120e82c4f835276d78d02dbd4fba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9bc6ebf7230212b874ebc4514f46b622e5e6120e82c4f835276d78d02dbd4fba", kill_on_drop: false }`
[INFO] [stdout] 9bc6ebf7230212b874ebc4514f46b622e5e6120e82c4f835276d78d02dbd4fba
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 89607f253db9dd9573ed0d858627d60d83f78f1929477da29d5e328803afa33d
[INFO] running `Command { std: "docker" "start" "-a" "89607f253db9dd9573ed0d858627d60d83f78f1929477da29d5e328803afa33d", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.114
[INFO] [stderr]    Compiling syn v1.0.33
[INFO] [stderr]    Compiling serde_json v1.0.55
[INFO] [stderr]     Checking smallvec v1.4.0
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-bigint v0.2.6
[INFO] [stderr]    Compiling num-complex v0.2.4
[INFO] [stderr]    Compiling num-rational v0.2.4
[INFO] [stderr]    Compiling indexmap v1.4.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking getrandom v0.1.14
[INFO] [stderr]    Compiling proc-macro2 v1.0.18
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking flatbuffers v0.6.1
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]    Compiling quote v1.0.7
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking prettytable-rs v0.8.0
[INFO] [stderr]    Compiling serde_derive v1.0.114
[INFO] [stderr]  Documenting polars_arrow_rvsry99dx v0.17.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #![feature(specialization)]
[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 `polars_arrow_rvsry99dx`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name polars_arrow_rvsry99dx src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --cfg 'feature="prettyprint"' --cfg 'feature="prettytable-rs"' --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern chrono=/opt/rustwide/target/debug/deps/libchrono-b87aa973827699c2.rmeta --extern csv=/opt/rustwide/target/debug/deps/libcsv-2f7503d3ea16ac05.rmeta --extern flatbuffers=/opt/rustwide/target/debug/deps/libflatbuffers-4ac497d7b3c99b31.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-0d870bc7fdc49f01.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-4a10b86abcf47b27.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-acd7d23482fe8b54.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-21437fb60b29aed5.rmeta --extern prettytable=/opt/rustwide/target/debug/deps/libprettytable-b4d2494ffd3f6eb0.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-898e78c8edad9ec6.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-a19d055f6ec10891.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-f3c75db6abbbbcf1.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-6fdd6dca2755e89e.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-0809e46840b5ae9c.rmeta --cap-lints=warn --crate-version 0.17.1` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "89607f253db9dd9573ed0d858627d60d83f78f1929477da29d5e328803afa33d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "89607f253db9dd9573ed0d858627d60d83f78f1929477da29d5e328803afa33d", kill_on_drop: false }`
[INFO] [stdout] 89607f253db9dd9573ed0d858627d60d83f78f1929477da29d5e328803afa33d
