[INFO] fetching crate polars_arrow_rvsry99dx 0.17.1...
[INFO] documenting polars_arrow_rvsry99dx-0.17.1 against 1.47.0 for beta-1.48-rustdoc-1
[INFO] extracting crate polars_arrow_rvsry99dx 0.17.1 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate polars_arrow_rvsry99dx 0.17.1 on toolchain 1.47.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.47.0" "read-manifest" "--manifest-path" "Cargo.toml", 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-2/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" "+1.47.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c37ae33ce202564c442abdcca432782fafe7fe75ebe7e08e79e18d1f2b619732
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "c37ae33ce202564c442abdcca432782fafe7fe75ebe7e08e79e18d1f2b619732", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c37ae33ce202564c442abdcca432782fafe7fe75ebe7e08e79e18d1f2b619732", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c37ae33ce202564c442abdcca432782fafe7fe75ebe7e08e79e18d1f2b619732", kill_on_drop: false }`
[INFO] [stdout] c37ae33ce202564c442abdcca432782fafe7fe75ebe7e08e79e18d1f2b619732
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.47.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8864efcaa87e1fa468283a19be7c616d7c181f262115dbb04838d6f64ee41b94
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "8864efcaa87e1fa468283a19be7c616d7c181f262115dbb04838d6f64ee41b94", 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 encode_unicode v0.3.6
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]     Checking flatbuffers v0.6.1
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking dirs v1.0.5
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking term v0.5.2
[INFO] [stderr]     Checking num-complex v0.2.4
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking chrono v0.4.11
[INFO] [stderr]     Checking num-rational v0.2.4
[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-2c3414c88927b20c.rmeta --extern csv=/opt/rustwide/target/debug/deps/libcsv-20bf2cb56ca7cb41.rmeta --extern flatbuffers=/opt/rustwide/target/debug/deps/libflatbuffers-1384f588bbc5cbaa.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-9b9149e9f18db67f.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-717728ddc95968b7.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-72923b2d9aa06af7.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-580b828c3e61e1fc.rmeta --extern prettytable=/opt/rustwide/target/debug/deps/libprettytable-48dddb6b17aa66e2.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-b7630b4c4e1ae38e.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-0879519133e6417a.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-6a3ae0ea6cf3f19f.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-f2078ee72d3a5d93.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-aa71b4ce8a49ec74.rmeta --cap-lints=warn --crate-version 0.17.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "8864efcaa87e1fa468283a19be7c616d7c181f262115dbb04838d6f64ee41b94", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8864efcaa87e1fa468283a19be7c616d7c181f262115dbb04838d6f64ee41b94", kill_on_drop: false }`
[INFO] [stdout] 8864efcaa87e1fa468283a19be7c616d7c181f262115dbb04838d6f64ee41b94
