[INFO] fetching crate fart-cli 0.4.0...
[INFO] documenting fart-cli-0.4.0 against beta-2022-05-20 for beta-1.62-rustdoc-1
[INFO] extracting crate fart-cli 0.4.0 into /workspace/builds/worker-4/source
[INFO] validating manifest of crates.io crate fart-cli 0.4.0 on toolchain beta-2022-05-20
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2022-05-20" "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-4/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-2022-05-20" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "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] 988991bbfdad7499a24db7b3ef42a9eb62911191fff53ba6e41a80e3f7587461
[INFO] running `Command { std: "docker" "start" "-a" "988991bbfdad7499a24db7b3ef42a9eb62911191fff53ba6e41a80e3f7587461", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "988991bbfdad7499a24db7b3ef42a9eb62911191fff53ba6e41a80e3f7587461", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "988991bbfdad7499a24db7b3ef42a9eb62911191fff53ba6e41a80e3f7587461", kill_on_drop: false }`
[INFO] [stdout] 988991bbfdad7499a24db7b3ef42a9eb62911191fff53ba6e41a80e3f7587461
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2022-05-20" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", 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] 2f61dee0653da4087bd124c29bb29fd0071dddc4339f35d3d0b7f6c39581c15e
[INFO] running `Command { std: "docker" "start" "-a" "2f61dee0653da4087bd124c29bb29fd0071dddc4339f35d3d0b7f6c39581c15e", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.66
[INFO] [stderr]    Compiling autocfg v0.1.7
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]     Checking futures v0.1.29
[INFO] [stderr]    Compiling syn v1.0.11
[INFO] [stderr]    Compiling byteorder v1.3.2
[INFO] [stderr]     Checking scopeguard v1.0.0
[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]    Compiling cc v1.0.48
[INFO] [stderr]    Compiling proc-macro-nested v0.1.3
[INFO] [stderr]     Checking itoa v0.4.4
[INFO] [stderr]     Checking futures-io v0.3.1
[INFO] [stderr]     Checking futures-sink v0.3.1
[INFO] [stderr]     Checking futures-core-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-sink-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-task v0.3.1
[INFO] [stderr]    Compiling httparse v1.3.4
[INFO] [stderr]    Compiling version_check v0.1.5
[INFO] [stderr]    Compiling serde v1.0.104
[INFO] [stderr]     Checking try-lock v0.2.2
[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]    Compiling ryu v1.0.2
[INFO] [stderr]    Compiling failure_derive v0.1.6
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]     Checking data-encoding v2.1.2
[INFO] [stderr]     Checking percent-encoding v1.0.1
[INFO] [stderr]     Checking same-file v1.0.5
[INFO] [stderr]     Checking mime v0.3.14
[INFO] [stderr]     Checking route-recognizer v0.1.13
[INFO] [stderr]     Checking bytes v0.5.3
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[INFO] [stderr]     Checking futures-channel v0.3.1
[INFO] [stderr]     Checking lock_api v0.3.2
[INFO] [stderr]     Checking futures-util-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]    Compiling proc-macro2 v1.0.6
[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 num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]     Checking walkdir v2.2.9
[INFO] [stderr]    Compiling error-chain v0.12.1
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[INFO] [stderr]     Checking smallvec v0.6.13
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[INFO] [stderr]     Checking tokio-io v0.1.12
[INFO] [stderr]     Checking http v0.1.21
[INFO] [stderr]     Checking tokio-buf v0.1.1
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[INFO] [stderr]     Checking tokio-reactor v0.1.11
[INFO] [stderr]     Checking async-std v1.3.0
[INFO] [stderr]     Checking notify v4.0.14
[INFO] [stderr]     Checking chrono v0.4.10
[INFO] [stderr]     Checking tokio-tcp v0.1.3
[INFO] [stderr]     Checking tokio v0.1.22
[INFO] [stderr]     Checking h2 v0.1.26
[INFO] [stderr]     Checking http-body v0.1.0
[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 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,artifacts,future-incompat --document-private-items '-Arustdoc::private-intra-doc-links' -C metadata=a80840bb3110c911 -L dependency=/opt/rustwide/target/debug/deps --extern async_std=/opt/rustwide/target/debug/deps/libasync_std-62d438a924a5d370.rmeta --extern bytes=/opt/rustwide/target/debug/deps/libbytes-397123641919bdf2.rmeta --extern chrono=/opt/rustwide/target/debug/deps/libchrono-b55aa7005d58f220.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-bacf2791b8b3f2b9.rmeta --extern futures=/opt/rustwide/target/debug/deps/libfutures-381722d6e943ce69.rmeta --extern http_service=/opt/rustwide/target/debug/deps/libhttp_service-64a753c97939336c.rmeta --extern notify=/opt/rustwide/target/debug/deps/libnotify-48b06dfdfca67800.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-668103c3feaf1600.rmeta --extern serde_json=/opt/rustwide/target/debug/deps/libserde_json-f0826c1b96ae8c2f.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-87a757d459d119b6.rmeta --extern tide=/opt/rustwide/target/debug/deps/libtide-4027021007d67036.rmeta --cap-lints=warn --crate-version 0.4.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "2f61dee0653da4087bd124c29bb29fd0071dddc4339f35d3d0b7f6c39581c15e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2f61dee0653da4087bd124c29bb29fd0071dddc4339f35d3d0b7f6c39581c15e", kill_on_drop: false }`
[INFO] [stdout] 2f61dee0653da4087bd124c29bb29fd0071dddc4339f35d3d0b7f6c39581c15e