[INFO] fetching crate mongodb-arrow-connector 0.2.0...
[INFO] documenting mongodb-arrow-connector-0.2.0 against 1.46.0 for beta-1.47-rustdoc-1
[INFO] extracting crate mongodb-arrow-connector 0.2.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate mongodb-arrow-connector 0.2.0 on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate mongodb-arrow-connector 0.2.0
[INFO] finished tweaking crates.io crate mongodb-arrow-connector 0.2.0
[INFO] tweaked toml for crates.io crate mongodb-arrow-connector 0.2.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9ba9a3cec358996b403b9de21e71450515ed2ba693040e5bbf2292eca16e9926
[INFO] running `Command { std: "docker" "start" "-a" "9ba9a3cec358996b403b9de21e71450515ed2ba693040e5bbf2292eca16e9926", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "9ba9a3cec358996b403b9de21e71450515ed2ba693040e5bbf2292eca16e9926", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9ba9a3cec358996b403b9de21e71450515ed2ba693040e5bbf2292eca16e9926", kill_on_drop: false }`
[INFO] [stdout] 9ba9a3cec358996b403b9de21e71450515ed2ba693040e5bbf2292eca16e9926
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b131fdc333dc7518e9fcc2fb3ea0ca5c97ece2817140236d3d58a94779cc1834
[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" "b131fdc333dc7518e9fcc2fb3ea0ca5c97ece2817140236d3d58a94779cc1834", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-lite v0.1.11
[INFO] [stderr]     Checking block-buffer v0.7.3
[INFO] [stderr]     Checking tokio v0.2.22
[INFO] [stderr]     Checking pbkdf2 v0.3.0
[INFO] [stderr]     Checking chrono v0.4.15
[INFO] [stderr]     Checking serde_json v1.0.57
[INFO] [stderr]     Checking bstr v0.2.13
[INFO] [stderr]     Checking futures-util v0.3.5
[INFO] [stderr]     Checking sha-1 v0.8.2
[INFO] [stderr]     Checking sha2 v0.8.2
[INFO] [stderr]     Checking md-5 v0.8.0
[INFO] [stderr]     Checking async-io v0.1.11
[INFO] [stderr]     Checking blocking v0.5.2
[INFO] [stderr]     Checking async-executor v0.1.2
[INFO] [stderr]     Checking csv v1.1.3
[INFO] [stderr]     Checking async-std v1.6.3
[INFO] [stderr]     Checking bson v1.1.0
[INFO] [stderr]     Checking arrow v1.0.1
[INFO] [stderr]     Checking tokio-rustls v0.13.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/arrow-1.0.1/src/lib.rs:24:1
[INFO] [stdout]    |
[INFO] [stdout] 24 | #![feature(specialization)]
[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 compile `arrow`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "b131fdc333dc7518e9fcc2fb3ea0ca5c97ece2817140236d3d58a94779cc1834", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b131fdc333dc7518e9fcc2fb3ea0ca5c97ece2817140236d3d58a94779cc1834", kill_on_drop: false }`
[INFO] [stdout] b131fdc333dc7518e9fcc2fb3ea0ca5c97ece2817140236d3d58a94779cc1834