[INFO] cloning repository https://github.com/vegtamr-ab/queueing-system
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/vegtamr-ab/queueing-system" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvegtamr-ab%2Fqueueing-system", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvegtamr-ab%2Fqueueing-system'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 4ef00bd802dd0b02d8504bea878d6d69c83c83ac
[INFO] documenting vegtamr-ab/queueing-system against 1.61.0 for beta-1.62-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fvegtamr-ab%2Fqueueing-system" "/workspace/builds/worker-31/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-31/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/vegtamr-ab/queueing-system on toolchain 1.61.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/vegtamr-ab/queueing-system
[INFO] finished tweaking git repo https://github.com/vegtamr-ab/queueing-system
[INFO] tweaked toml for git repo https://github.com/vegtamr-ab/queueing-system written to /workspace/builds/worker-31/source/Cargo.toml
[INFO] crate git repo https://github.com/vegtamr-ab/queueing-system already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.61.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Updating git repository `https://github.com/38/plotters.git`
[INFO] [stderr]     Updating git submodule `https://github.com/38/plotters-doc-data`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded pathfinder_simd v0.5.0
[INFO] [stderr]   Downloaded pathfinder_geometry v0.5.1
[INFO] [stderr]   Downloaded plotters-bitmap v0.3.0
[INFO] [stderr]   Downloaded plotters-svg v0.3.0
[INFO] [stderr]   Downloaded font-kit v0.7.1
[INFO] [stderr]   Downloaded image v0.23.12
[INFO] [stderr]   Downloaded freetype v0.4.1
[INFO] [stderr]   Downloaded futures-sink v0.3.6
[INFO] [stderr]   Downloaded futures-io v0.3.6
[INFO] [stderr]   Downloaded futures-util v0.3.6
[INFO] [stderr]   Downloaded expat-sys v2.1.6
[INFO] [stderr]   Downloaded futures-channel v0.3.6
[INFO] [stderr]   Downloaded core-text v15.0.0
[INFO] [stderr]   Downloaded plotters-backend v0.3.0
[INFO] [stderr]   Downloaded futures v0.3.6
[INFO] [stderr]   Downloaded ttf-parser v0.8.3
[INFO] [stderr]   Downloaded futures-executor v0.3.6
[INFO] [stderr]   Downloaded futures-macro v0.3.6
[INFO] [stderr]   Downloaded servo-fontconfig v0.4.0
[INFO] [stderr]   Downloaded cc v1.0.61
[INFO] [stderr]   Downloaded futures-task v0.3.6
[INFO] [stderr]   Downloaded servo-fontconfig-sys v4.0.9
[INFO] [stderr]   Downloaded servo-freetype-sys v4.0.5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "+1.61.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 647107b6238195e5428d93bb81647b5d75748f46fe6a69cd8449ed349c6407e6
[INFO] running `Command { std: "docker" "start" "-a" "647107b6238195e5428d93bb81647b5d75748f46fe6a69cd8449ed349c6407e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "647107b6238195e5428d93bb81647b5d75748f46fe6a69cd8449ed349c6407e6", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "647107b6238195e5428d93bb81647b5d75748f46fe6a69cd8449ed349c6407e6", kill_on_drop: false }`
[INFO] [stdout] 647107b6238195e5428d93bb81647b5d75748f46fe6a69cd8449ed349c6407e6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-31/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" "+1.61.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c043cb52579e58e8e8d35b0f4eda15e2915c9b0efd1fd5f6209032bc4734aa7f
[INFO] running `Command { std: "docker" "start" "-a" "c043cb52579e58e8e8d35b0f4eda15e2915c9b0efd1fd5f6209032bc4734aa7f", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.24
[INFO] [stderr]    Compiling unicode-xid v0.2.1
[INFO] [stderr]    Compiling syn v1.0.44
[INFO] [stderr]    Compiling pkg-config v0.3.19
[INFO] [stderr]    Compiling serde v1.0.117
[INFO] [stderr]    Compiling unicode-segmentation v1.6.0
[INFO] [stderr]    Compiling strum v0.18.0
[INFO] [stderr]    Compiling version-compare v0.0.10
[INFO] [stderr]    Compiling libc v0.2.79
[INFO] [stderr]    Compiling autocfg v1.0.1
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling version_check v0.9.2
[INFO] [stderr]    Compiling pin-project-internal v0.4.27
[INFO] [stderr]    Compiling cc v1.0.61
[INFO] [stderr]    Compiling proc-macro-nested v0.1.6
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]     Checking futures-core v0.3.6
[INFO] [stderr]     Checking futures-sink v0.3.6
[INFO] [stderr]     Checking once_cell v1.4.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.18
[INFO] [stderr]    Compiling anyhow v1.0.35
[INFO] [stderr]     Checking pin-utils v0.1.0
[INFO] [stderr]     Checking slab v0.4.2
[INFO] [stderr]     Checking futures-io v0.3.6
[INFO] [stderr]    Compiling either v1.6.1
[INFO] [stderr]     Checking adler32 v1.2.0
[INFO] [stderr]     Checking cfg-if v0.1.10
[INFO] [stderr]    Compiling semver-parser v0.7.0
[INFO] [stderr]    Compiling crc32fast v1.2.1
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling getrandom v0.1.15
[INFO] [stderr]    Compiling gio v0.9.1
[INFO] [stderr]    Compiling log v0.4.11
[INFO] [stderr]    Compiling pango v0.9.1
[INFO] [stderr]    Compiling cairo-rs v0.9.1
[INFO] [stderr]    Compiling gdk-pixbuf v0.9.0
[INFO] [stderr]     Checking color_quant v1.1.0
[INFO] [stderr]    Compiling gdk v0.13.2
[INFO] [stderr]     Checking lzw v0.10.0
[INFO] [stderr]     Checking same-file v1.0.6
[INFO] [stderr]    Compiling atk v0.9.0
[INFO] [stderr]     Checking plotters-backend v0.3.0
[INFO] [stderr]     Checking float-ord v0.2.0
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking ppv-lite86 v0.2.9
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[INFO] [stderr]    Compiling num-traits v0.2.14
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[INFO] [stderr]    Compiling servo-fontconfig-sys v4.0.9
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[INFO] [stderr]     Checking dirs v2.0.2
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[INFO] [stderr]     Checking rand_chacha v0.2.2
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[INFO] [stderr]     Checking freetype v0.4.1
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking servo-fontconfig v0.4.0
[INFO] [stderr]     Checking chrono v0.4.19
[INFO] [stderr]     Checking pathfinder_geometry v0.5.1
[INFO] [stderr]     Checking font-kit v0.7.1
[INFO] [stderr]     Checking image v0.22.5
[INFO] [stderr]     Checking image v0.23.12
[INFO] [stderr]    Compiling toml v0.5.7
[INFO] [stderr]     Checking plotters-bitmap v0.3.0
[INFO] [stderr]     Checking plotters v0.3.0 (https://github.com/38/plotters.git#96d51844)
[INFO] [stderr]    Compiling proc-macro-crate v0.1.5
[INFO] [stderr]    Compiling thiserror-impl v1.0.21
[INFO] [stderr]    Compiling strum_macros v0.18.0
[INFO] [stderr]    Compiling futures-macro v0.3.6
[INFO] [stderr]    Compiling glib-macros v0.10.1
[INFO] [stderr]    Compiling thiserror v1.0.21
[INFO] [stderr]    Compiling system-deps v1.3.2
[INFO] [stderr]     Checking pin-project v0.4.27
[INFO] [stderr]    Compiling glib-sys v0.10.1
[INFO] [stderr]    Compiling gobject-sys v0.10.0
[INFO] [stderr]    Compiling gio-sys v0.10.1
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.10.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.10.0
[INFO] [stderr]    Compiling pango-sys v0.10.0
[INFO] [stderr]    Compiling atk-sys v0.10.0
[INFO] [stderr]    Compiling gdk-sys v0.10.0
[INFO] [stderr]    Compiling gtk-sys v0.10.0
[INFO] [stderr]     Checking futures-util v0.3.6
[INFO] [stderr]     Checking futures-executor v0.3.6
[INFO] [stderr]     Checking futures v0.3.6
[INFO] [stderr]     Checking glib v0.10.3
[INFO] [stderr]  Documenting queueing-system v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> src/main.rs:1:12
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(once_cell)]
[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 document `queueing-system`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name queueing_system src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=7e935d4df3891ee5 -L dependency=/opt/rustwide/target/debug/deps --extern gio=/opt/rustwide/target/debug/deps/libgio-22d3581d27e87199.rmeta --extern glib=/opt/rustwide/target/debug/deps/libglib-a398590e9c91c07f.rmeta --extern gnuplot=/opt/rustwide/target/debug/deps/libgnuplot-7dcbe0c7de9d97c3.rmeta --extern gtk=/opt/rustwide/target/debug/deps/libgtk-15d904e6a8c4dcfc.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-31732f101c7334d9.rmeta --extern plotters=/opt/rustwide/target/debug/deps/libplotters-28e1c8331b729d39.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-45e8039ccf0e9028.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "c043cb52579e58e8e8d35b0f4eda15e2915c9b0efd1fd5f6209032bc4734aa7f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c043cb52579e58e8e8d35b0f4eda15e2915c9b0efd1fd5f6209032bc4734aa7f", kill_on_drop: false }`
[INFO] [stdout] c043cb52579e58e8e8d35b0f4eda15e2915c9b0efd1fd5f6209032bc4734aa7f