[INFO] fetching crate arrow 1.0.1...
[INFO] documenting arrow-1.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate arrow 1.0.1 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate arrow 1.0.1 on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate arrow 1.0.1
[INFO] finished tweaking crates.io crate arrow 1.0.1
[INFO] tweaked toml for crates.io crate arrow 1.0.1 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate arrow 1.0.1 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--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 packed_simd v0.3.3
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] b2ce02402de3fb0c3353325a7d415238975bf11b39e6018c7138a188a52896f0
[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" "b2ce02402de3fb0c3353325a7d415238975bf11b39e6018c7138a188a52896f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "b2ce02402de3fb0c3353325a7d415238975bf11b39e6018c7138a188a52896f0", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b2ce02402de3fb0c3353325a7d415238975bf11b39e6018c7138a188a52896f0", kill_on_drop: false }`
[INFO] [stdout] b2ce02402de3fb0c3353325a7d415238975bf11b39e6018c7138a188a52896f0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 385313cf77ce67ca84bd31be06cc5de8bef9095bebfee713a4e87c0966779a53
[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" "385313cf77ce67ca84bd31be06cc5de8bef9095bebfee713a4e87c0966779a53", kill_on_drop: false }`
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling num-bigint v0.3.0
[INFO] [stderr]    Compiling num-iter v0.1.41
[INFO] [stderr]    Compiling num-rational v0.3.0
[INFO] [stderr]    Compiling indexmap v1.5.1
[INFO] [stderr]     Checking flatbuffers v0.6.1
[INFO] [stderr]     Checking csv-core v0.1.10
[INFO] [stderr]     Checking num-complex v0.3.0
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]    Compiling syn v1.0.38
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking regex-automata v0.1.9
[INFO] [stderr]     Checking num v0.3.0
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.115
[INFO] [stderr]  Documenting arrow v1.0.1 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta 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 `arrow`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type lib --crate-name arrow src/lib.rs -o /opt/rustwide/target/doc --cfg 'feature="default"' --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-88b48f28e095cf5a.rmeta --extern csv=/opt/rustwide/target/debug/deps/libcsv-6a5df7a795f0b012.rmeta --extern flatbuffers=/opt/rustwide/target/debug/deps/libflatbuffers-c9853e595cc00e49.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-b38b297ae8f34fd9.rmeta --extern indexmap=/opt/rustwide/target/debug/deps/libindexmap-e44679e51141e29f.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-e1e852e7118e8095.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-11946bb198eefaee.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-c251ca4f1be2ef5d.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-1a0148d363561a2a.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-76e5d729e833d470.so --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-50c40779cfc148c5.rmeta --cap-lints=warn --crate-version 1.0.1` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "385313cf77ce67ca84bd31be06cc5de8bef9095bebfee713a4e87c0966779a53", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "385313cf77ce67ca84bd31be06cc5de8bef9095bebfee713a4e87c0966779a53", kill_on_drop: false }`
[INFO] [stdout] 385313cf77ce67ca84bd31be06cc5de8bef9095bebfee713a4e87c0966779a53