[INFO] fetching crate kapiti 0.0.1...
[INFO] documenting kapiti-0.0.1 against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] extracting crate kapiti 0.0.1 into /workspace/builds/worker-9/source
[INFO] validating manifest of crates.io crate kapiti 0.0.1 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 kapiti 0.0.1
[INFO] finished tweaking crates.io crate kapiti 0.0.1
[INFO] tweaked toml for crates.io crate kapiti 0.0.1 written to /workspace/builds/worker-9/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[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]  Downloading crates ...
[INFO] [stderr]   Downloaded tokio-macros v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-tcp v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-current-thread v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-uds v0.3.0-alpha.1
[INFO] [stderr]   Downloaded tokio-executor v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-udp v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-io v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-fs v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-codec v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-reactor v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-threadpool v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-sync v0.2.0-alpha.1
[INFO] [stderr]   Downloaded tokio-timer v0.3.0-alpha.1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 108b4fd3f9643a8437564723820076faa58dfdb286e88db3063bad64fbf69f4e
[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" "108b4fd3f9643a8437564723820076faa58dfdb286e88db3063bad64fbf69f4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "108b4fd3f9643a8437564723820076faa58dfdb286e88db3063bad64fbf69f4e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "108b4fd3f9643a8437564723820076faa58dfdb286e88db3063bad64fbf69f4e", kill_on_drop: false }`
[INFO] [stdout] 108b4fd3f9643a8437564723820076faa58dfdb286e88db3063bad64fbf69f4e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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] 14cae61b4899613f630eee55eaca717415377a4b028c716ab90ef5ed422732b4
[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" "14cae61b4899613f630eee55eaca717415377a4b028c716ab90ef5ed422732b4", kill_on_drop: false }`
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking tokio-executor v0.2.0-alpha.1
[INFO] [stderr]    Compiling protobuf v2.17.0
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling csv-core v0.1.10
[INFO] [stderr]    Compiling regex-automata v0.1.9
[INFO] [stderr]    Compiling serde v1.0.115
[INFO] [stderr]     Checking tokio-current-thread v0.2.0-alpha.1
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking tokio-io v0.2.0-alpha.1
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking tokio-codec v0.2.0-alpha.1
[INFO] [stderr]     Checking tokio-sync v0.2.0-alpha.1
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/tokio-sync-0.2.0-alpha.1/src/lib.rs:10:1
[INFO] [stdout]    |
[INFO] [stdout] 10 | #![feature(async_await)]
[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 `tokio-sync`.
[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" "14cae61b4899613f630eee55eaca717415377a4b028c716ab90ef5ed422732b4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "14cae61b4899613f630eee55eaca717415377a4b028c716ab90ef5ed422732b4", kill_on_drop: false }`
[INFO] [stdout] 14cae61b4899613f630eee55eaca717415377a4b028c716ab90ef5ed422732b4