[INFO] fetching crate fart-cli 0.4.0...
[INFO] documenting fart-cli-0.4.0 against beta-2021-08-01 for beta-1.55-rustdoc-1
[INFO] extracting crate fart-cli 0.4.0 into /workspace/builds/worker-22/source
[INFO] validating manifest of crates.io crate fart-cli 0.4.0 on toolchain beta-2021-08-01
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking crates.io crate fart-cli 0.4.0
[INFO] finished tweaking crates.io crate fart-cli 0.4.0
[INFO] tweaked toml for crates.io crate fart-cli 0.4.0 written to /workspace/builds/worker-22/source/Cargo.toml
[INFO] crate crates.io crate fart-cli 0.4.0 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2021-08-01" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] d34076725340dc0fd2dabda6b50c1f9851a7f485acf3a85bca18c62be6be778b
[INFO] running `Command { std: "docker" "start" "-a" "d34076725340dc0fd2dabda6b50c1f9851a7f485acf3a85bca18c62be6be778b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d34076725340dc0fd2dabda6b50c1f9851a7f485acf3a85bca18c62be6be778b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d34076725340dc0fd2dabda6b50c1f9851a7f485acf3a85bca18c62be6be778b", kill_on_drop: false }`
[INFO] [stdout] d34076725340dc0fd2dabda6b50c1f9851a7f485acf3a85bca18c62be6be778b
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-22/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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2021-08-01" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 8a449571e16c562efd63da7be8a7eb76e5221bcc5d3788fc4469696968f3ea9a
[INFO] running `Command { std: "docker" "start" "-a" "8a449571e16c562efd63da7be8a7eb76e5221bcc5d3788fc4469696968f3ea9a", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking scopeguard v1.0.0
[INFO] [stderr]     Checking fnv v1.0.6
[INFO] [stderr]     Checking pin-utils v0.1.0-alpha.4
[INFO] [stderr]    Compiling memchr v2.2.1
[INFO] [stderr]     Checking futures-core v0.3.1
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]    Compiling cc v1.0.48
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-sink v0.3.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-io v0.3.1
[INFO] [stderr]     Checking futures-task v0.3.1
[INFO] [stderr]     Checking pin-project-lite v0.1.1
[INFO] [stderr]     Checking once_cell v1.2.0
[INFO] [stderr]     Checking futures-timer v2.0.2
[INFO] [stderr]     Checking try-lock v0.2.2
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]     Checking data-encoding v2.1.2
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking lazycell v1.2.1
[INFO] [stderr]     Checking mime v0.3.14
[INFO] [stderr]     Checking route-recognizer v0.1.13
[INFO] [stderr]     Checking bytes v0.5.3
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]    Compiling indexmap v1.3.0
[INFO] [stderr]    Compiling error-chain v0.12.1
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking tokio-executor v0.1.9
[INFO] [stderr]     Checking crossbeam-queue v0.1.2
[INFO] [stderr]     Checking async-task v1.0.0
[INFO] [stderr]    Compiling memoffset v0.5.3
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[INFO] [stderr]     Checking futures-channel v0.3.1
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[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
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[INFO] [stderr]     Checking inotify-sys v0.1.3
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[INFO] [stderr]    Compiling backtrace-sys v0.1.32
[INFO] [stderr]     Checking inotify v0.6.1
[INFO] [stderr]     Checking bytes v0.4.12
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[INFO] [stderr]     Checking tokio-threadpool v0.1.17
[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking string v0.2.1
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[INFO] [stderr]     Checking notify v4.0.14
[INFO] [stderr]     Checking backtrace v0.3.40
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking http-body v0.1.0
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]    Compiling synstructure v0.12.3
[INFO] [stderr]    Compiling proc-macro-error v0.2.6
[INFO] [stderr]    Compiling proc-macro-hack v0.5.11
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]    Compiling structopt-derive v0.3.5
[INFO] [stderr]    Compiling futures-macro v0.3.1
[INFO] [stderr]     Checking failure v0.1.6
[INFO] [stderr]     Checking structopt v0.3.5
[INFO] [stderr]     Checking futures-util v0.3.1
[INFO] [stderr]     Checking futures-executor v0.3.1
[INFO] [stderr]     Checking futures v0.3.1
[INFO] [stderr]     Checking http-service v0.4.0
[INFO] [stderr]     Checking serde v1.0.104
[INFO] [stderr]     Checking http-service-hyper v0.4.1
[INFO] [stderr]     Checking serde_json v1.0.44
[INFO] [stderr]     Checking serde_qs v0.5.2
[INFO] [stderr]     Checking tide v0.4.0
[INFO] [stderr]  Documenting fart-cli v0.4.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[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 `fart-cli`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name fart src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi --document-private-items -L dependency=/opt/rustwide/target/debug/deps --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-9ffad92ed7f25612.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-7b636d6d8fea7886.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-6501e35c610c12b9.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-519e9676bb25f6f9.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-9ccac0d142bf5344.rmeta --extern http_service=/opt/rustwide/target/debug/deps/libhttp_service-17b95004af249c7f.rmeta --extern notify=/opt/rustwide/target/debug/deps/libnotify-e1a4631aa9fb617e.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-c24c6213041ffc4d.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-3038f367a3932ab8.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-db3a64739e2fd996.rmeta --extern tide=/opt/rustwide/target/debug/deps/libtide-2fedc7ddf1cfd43a.rmeta --cap-lints=warn --crate-version 0.4.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "8a449571e16c562efd63da7be8a7eb76e5221bcc5d3788fc4469696968f3ea9a", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8a449571e16c562efd63da7be8a7eb76e5221bcc5d3788fc4469696968f3ea9a", kill_on_drop: false }`
[INFO] [stdout] 8a449571e16c562efd63da7be8a7eb76e5221bcc5d3788fc4469696968f3ea9a
