[INFO] fetching crate agilulf_driver 0.1.0...
[INFO] documenting agilulf_driver-0.1.0 against 1.76.0 for beta-1.77-rustdoc-1
[INFO] extracting crate agilulf_driver 0.1.0 into /workspace/builds/worker-6-tc1/source
[INFO] validating manifest of crates.io crate agilulf_driver 0.1.0 on toolchain 1.76.0
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate agilulf_driver 0.1.0
[INFO] finished tweaking crates.io crate agilulf_driver 0.1.0
[INFO] tweaked toml for crates.io crate agilulf_driver 0.1.0 written to /workspace/builds/worker-6-tc1/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+1.76.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr] warning: spurious network error (3 tries remaining): [55] Failed sending data to the peer (Send failure: Broken pipe)
[INFO] [stderr]   Downloaded agilulf_protocol v0.1.0
[INFO] [stderr]   Downloaded smallvec v0.6.14
[INFO] [stderr]   Downloaded crossbeam-utils v0.6.6
[INFO] [stderr]   Downloaded crossbeam v0.7.3
[INFO] [stderr]   Downloaded futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded async-ready v3.0.0
[INFO] [stderr]   Downloaded rand_hc v0.1.0
[INFO] [stderr]   Downloaded lock_api v0.1.5
[INFO] [stderr]   Downloaded rand_pcg v0.1.2
[INFO] [stderr]   Downloaded rand_os v0.1.3
[INFO] [stderr]   Downloaded futures-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded crossbeam-epoch v0.8.2
[INFO] [stderr]   Downloaded stable_deref_trait v1.2.0
[INFO] [stderr]   Downloaded proc-macro-nested v0.1.7
[INFO] [stderr]   Downloaded futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded romio v0.3.0-alpha.9
[INFO] [stderr]   Downloaded agilulf_skiplist v0.1.0
[INFO] [stderr]   Downloaded crossbeam-deque v0.7.4
[INFO] [stderr]   Downloaded futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded memoffset v0.5.6
[INFO] [stderr]   Downloaded rand v0.6.5
[INFO] [stderr]   Downloaded parking_lot v0.7.1
[INFO] [stderr]   Downloaded rdrand v0.4.0
[INFO] [stderr]   Downloaded futures-executor-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded env_logger v0.6.2
[INFO] [stderr]   Downloaded parking_lot_core v0.4.0
[INFO] [stderr]   Downloaded scopeguard v0.3.3
[INFO] [stderr]   Downloaded futures-util-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]   Downloaded async-datagram v3.0.0
[INFO] [stderr]   Downloaded rand_xorshift v0.1.1
[INFO] [stderr]   Downloaded agilulf v0.1.0
[INFO] [stderr]   Downloaded owning_ref v0.4.1
[INFO] [stderr]   Downloaded autocfg v0.1.8
[INFO] [stderr]   Downloaded rand_isaac v0.1.1
[INFO] [stderr]   Downloaded quick-error v1.2.3
[INFO] [stderr]   Downloaded agilulf_fs v0.1.0
[INFO] [stderr]   Downloaded rand_chacha v0.1.1
[INFO] [stderr]   Downloaded crossbeam-channel v0.3.9
[INFO] [stderr]   Downloaded rand_jitter v0.1.4
[INFO] [stderr]   Downloaded mio-uds v0.6.8
[INFO] [stderr]   Downloaded humantime v1.3.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3bcd6bff9e5d3d0526b6da0c101f94afb5579ca145f3094b58d06666701151f1
[INFO] running `Command { std: "docker" "start" "-a" "3bcd6bff9e5d3d0526b6da0c101f94afb5579ca145f3094b58d06666701151f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3bcd6bff9e5d3d0526b6da0c101f94afb5579ca145f3094b58d06666701151f1", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3bcd6bff9e5d3d0526b6da0c101f94afb5579ca145f3094b58d06666701151f1", kill_on_drop: false }`
[INFO] [stdout] 3bcd6bff9e5d3d0526b6da0c101f94afb5579ca145f3094b58d06666701151f1
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc1/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+1.76.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 16160a6a54483636816297b3a18c9e39908b94b91070a902c4101910a82565a5
[INFO] running `Command { std: "docker" "start" "-a" "16160a6a54483636816297b3a18c9e39908b94b91070a902c4101910a82565a5", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking async-datagram v3.0.0
[INFO] [stderr]     Checking async-ready v3.0.0
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/futures-util-preview-0.3.0-alpha.17/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since `1.39.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `futures-util-preview` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "16160a6a54483636816297b3a18c9e39908b94b91070a902c4101910a82565a5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "16160a6a54483636816297b3a18c9e39908b94b91070a902c4101910a82565a5", kill_on_drop: false }`
[INFO] [stdout] 16160a6a54483636816297b3a18c9e39908b94b91070a902c4101910a82565a5
[INFO] documenting agilulf_driver-0.1.0 against beta-2024-02-10 for beta-1.77-rustdoc-1
[INFO] extracting crate agilulf_driver 0.1.0 into /workspace/builds/worker-6-tc2/source
[INFO] validating manifest of crates.io crate agilulf_driver 0.1.0 on toolchain beta-2024-02-10
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate agilulf_driver 0.1.0
[INFO] finished tweaking crates.io crate agilulf_driver 0.1.0
[INFO] tweaked toml for crates.io crate agilulf_driver 0.1.0 written to /workspace/builds/worker-6-tc2/source/Cargo.toml
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "generate-lockfile" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating crates.io index
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2024-02-10" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 1d512bdfa28a5213c40f09800b5e8ab0a9f850e5e9942bd41ea91ea64784f169
[INFO] running `Command { std: "docker" "start" "-a" "1d512bdfa28a5213c40f09800b5e8ab0a9f850e5e9942bd41ea91ea64784f169", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1d512bdfa28a5213c40f09800b5e8ab0a9f850e5e9942bd41ea91ea64784f169", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1d512bdfa28a5213c40f09800b5e8ab0a9f850e5e9942bd41ea91ea64784f169", kill_on_drop: false }`
[INFO] [stdout] 1d512bdfa28a5213c40f09800b5e8ab0a9f850e5e9942bd41ea91ea64784f169
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6-tc2/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" "RUSTFLAGS=--cap-lints=warn" "-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@sha256:2788e3201cd34a07e3172128adcd8b3090168a8e3bcc40d7c032b9dda1df7d1c" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2024-02-10" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3484abc808d8f33d3616f695c5a10d62fbe940bbdc7909cac188932aa15f4365
[INFO] running `Command { std: "docker" "start" "-a" "3484abc808d8f33d3616f695c5a10d62fbe940bbdc7909cac188932aa15f4365", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v0.1.8
[INFO] [stderr]     Checking rand_core v0.4.2
[INFO] [stderr]    Compiling getrandom v0.1.16
[INFO] [stderr]    Compiling syn v0.15.44
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling proc-macro-nested v0.1.7
[INFO] [stderr]     Checking futures-io-preview v0.3.0-alpha.17
[INFO] [stderr]    Compiling rand_chacha v0.1.1
[INFO] [stderr]    Compiling rand_pcg v0.1.2
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking rand_core v0.3.1
[INFO] [stderr]    Compiling semver v0.9.0
[INFO] [stderr]    Compiling rand v0.6.5
[INFO] [stderr]     Checking rand_isaac v0.1.1
[INFO] [stderr]    Compiling rustc_version v0.2.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_hc v0.1.0
[INFO] [stderr]     Checking rand_xorshift v0.1.1
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking rand_os v0.1.3
[INFO] [stderr]     Checking rand_jitter v0.1.4
[INFO] [stderr]     Checking stable_deref_trait v1.2.0
[INFO] [stderr]     Checking smallvec v0.6.14
[INFO] [stderr]    Compiling parking_lot_core v0.4.0
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking owning_ref v0.4.1
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]     Checking log v0.4.20
[INFO] [stderr]     Checking crossbeam-utils v0.6.6
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking async-datagram v3.0.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking async-ready v3.0.0
[INFO] [stderr]     Checking mio v0.6.23
[INFO] [stderr]     Checking quick-error v1.2.3
[INFO] [stderr]     Checking mio-uds v0.6.8
[INFO] [stderr]     Checking parking_lot v0.7.1
[INFO] [stderr]    Compiling futures-select-macro-preview v0.3.0-alpha.17
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.17
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/index.crates.io-6f17d22bba15001f/futures-util-preview-0.3.0-alpha.17/src/lib.rs:4:38
[INFO] [stdout]   |
[INFO] [stdout] 4 | #![cfg_attr(feature = "async-await", feature(async_await))]
[INFO] [stdout]   |                                      ^^^^^^^^^^^^^^^^^^^^ help: remove the attribute
[INFO] [stdout]   |
[INFO] [stdout]   = help: the feature `async_await` has been stable since `1.39.0` and no longer requires an attribute to enable
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] error: aborting due to 1 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 `futures-util-preview` (lib) due to 2 previous errors
[INFO] running `Command { std: "docker" "inspect" "3484abc808d8f33d3616f695c5a10d62fbe940bbdc7909cac188932aa15f4365", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3484abc808d8f33d3616f695c5a10d62fbe940bbdc7909cac188932aa15f4365", kill_on_drop: false }`
[INFO] [stdout] 3484abc808d8f33d3616f695c5a10d62fbe940bbdc7909cac188932aa15f4365
