[INFO] cloning repository https://github.com/kirillt/ark-tagger
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/kirillt/ark-tagger" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkirillt%2Fark-tagger", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkirillt%2Fark-tagger'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 1dd86d732fa4b6c344a87f6acc94f1dc3887950d
[INFO] documenting kirillt/ark-tagger against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkirillt%2Fark-tagger" "/workspace/builds/worker-5/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kirillt/ark-tagger 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 git repo https://github.com/kirillt/ark-tagger
[INFO] finished tweaking git repo https://github.com/kirillt/ark-tagger
[INFO] tweaked toml for git repo https://github.com/kirillt/ark-tagger written to /workspace/builds/worker-5/source/Cargo.toml
[INFO] crate git repo https://github.com/kirillt/ark-tagger already has a lockfile, it will not be regenerated
[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]     Updating git repository `https://github.com/hecrj/iced.git`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 06a9d417fa556ee3f1cb99a73e7c4261f4ac275836276092fbde841dfd26596e
[INFO] running `Command { std: "docker" "start" "-a" "06a9d417fa556ee3f1cb99a73e7c4261f4ac275836276092fbde841dfd26596e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "06a9d417fa556ee3f1cb99a73e7c4261f4ac275836276092fbde841dfd26596e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "06a9d417fa556ee3f1cb99a73e7c4261f4ac275836276092fbde841dfd26596e", kill_on_drop: false }`
[INFO] [stdout] 06a9d417fa556ee3f1cb99a73e7c4261f4ac275836276092fbde841dfd26596e
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5/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] e0ae96126884de4c7c67daa89df18a86c66ced5a3f7fa960fe5926fa78f46eab
[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" "e0ae96126884de4c7c67daa89df18a86c66ced5a3f7fa960fe5926fa78f46eab", kill_on_drop: false }`
[INFO] [stderr]    Compiling log v0.4.8
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[INFO] [stderr]     Checking instant v0.1.2
[INFO] [stderr]     Checking svg_fmt v0.2.1
[INFO] [stderr]     Checking float-ord v0.2.0
[INFO] [stderr]     Checking opener v0.4.1
[INFO] [stderr]     Checking number_prefix v0.4.0
[INFO] [stderr]     Checking glam v0.8.6
[INFO] [stderr]    Compiling libloading v0.5.2
[INFO] [stderr]    Compiling cmake v0.1.42
[INFO] [stderr]    Compiling x11 v2.18.2
[INFO] [stderr]    Compiling servo-fontconfig-sys v4.0.9
[INFO] [stderr]     Checking futures-channel v0.3.4
[INFO] [stderr]    Compiling libc v0.2.69
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[INFO] [stderr]    Compiling wayland-client v0.23.6
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[INFO] [stderr]    Compiling synstructure v0.12.3
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[INFO] [stderr]    Compiling peek-poke-derive v0.2.1
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[INFO] [stderr]    Compiling derive_more v0.99.5
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[INFO] [stderr]     Checking iced_futures v0.1.1 (https://github.com/hecrj/iced.git#edd01159)
[INFO] [stderr]     Checking iced_native v0.2.1 (https://github.com/hecrj/iced.git#edd01159)
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[INFO] [stderr]     Checking smithay-clipboard v0.3.7
[INFO] [stderr]     Checking winit v0.22.1
[INFO] [stderr]     Checking wgpu-core v0.5.3
[INFO] [stderr]     Checking clipboard_wayland v0.1.0
[INFO] [stderr]     Checking window_clipboard v0.1.1
[INFO] [stderr]     Checking iced_winit v0.1.1 (https://github.com/hecrj/iced.git#edd01159)
[INFO] [stderr]     Checking wgpu-native v0.5.0
[INFO] [stderr]     Checking wgpu v0.5.0
[INFO] [stderr]     Checking wgpu_glyph v0.8.0
[INFO] [stderr]     Checking iced_wgpu v0.2.1 (https://github.com/hecrj/iced.git#edd01159)
[INFO] [stderr]     Checking iced v0.1.1 (https://github.com/hecrj/iced.git#edd01159)
[INFO] [stderr]  Documenting ark-tagger v0.1.0 (/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(try_trait)]
[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 `ark-tagger`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ark_tagger 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 chrono=/opt/rustwide/target/debug/deps/libchrono-cef2b3d979678bcc.rmeta --extern crc32fast=/opt/rustwide/target/debug/deps/libcrc32fast-84a88afc9f98ce77.rmeta --extern derive_more=/opt/rustwide/target/debug/deps/libderive_more-6db0dcf603d3578f.so --extern iced=/opt/rustwide/target/debug/deps/libiced-93ffb7cec2e3b162.rmeta --extern iced_native=/opt/rustwide/target/debug/deps/libiced_native-7bfcfa3058de910c.rmeta --extern lazy_static=/opt/rustwide/target/debug/deps/liblazy_static-db88f49d9e5662e7.rmeta --extern number_prefix=/opt/rustwide/target/debug/deps/libnumber_prefix-f655bd7d40f317e7.rmeta --extern opener=/opt/rustwide/target/debug/deps/libopener-f16694e8ec9d3bc7.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "e0ae96126884de4c7c67daa89df18a86c66ced5a3f7fa960fe5926fa78f46eab", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "e0ae96126884de4c7c67daa89df18a86c66ced5a3f7fa960fe5926fa78f46eab", kill_on_drop: false }`
[INFO] [stdout] e0ae96126884de4c7c67daa89df18a86c66ced5a3f7fa960fe5926fa78f46eab