[INFO] cloning repository https://github.com/risboo6909/aoc2020
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/risboo6909/aoc2020" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frisboo6909%2Faoc2020", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frisboo6909%2Faoc2020'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca565fcdb401ac2e736693b78be702b7deb97bc6
[INFO] documenting risboo6909/aoc2020 against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frisboo6909%2Faoc2020" "/workspace/builds/worker-8/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-8/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/risboo6909/aoc2020 on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/risboo6909/aoc2020
[INFO] finished tweaking git repo https://github.com/risboo6909/aoc2020
[INFO] tweaked toml for git repo https://github.com/risboo6909/aoc2020 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/risboo6909/aoc2020 already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] ec770960ce8b40443896a04566ead5de64e9c6e211c1ae6688a427a20162ae9f
[INFO] running `Command { std: "docker" "start" "-a" "ec770960ce8b40443896a04566ead5de64e9c6e211c1ae6688a427a20162ae9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "ec770960ce8b40443896a04566ead5de64e9c6e211c1ae6688a427a20162ae9f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "ec770960ce8b40443896a04566ead5de64e9c6e211c1ae6688a427a20162ae9f", kill_on_drop: false }`
[INFO] [stdout] ec770960ce8b40443896a04566ead5de64e9c6e211c1ae6688a427a20162ae9f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-8/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" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 337a2a8744389500c4e6f374dd30662cfb44128ef3fda16ea6f85b55e5645e1b
[INFO] running `Command { std: "docker" "start" "-a" "337a2a8744389500c4e6f374dd30662cfb44128ef3fda16ea6f85b55e5645e1b", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.85
[INFO] [stderr]    Compiling const_fn v0.4.5
[INFO] [stderr]    Compiling syn v1.0.60
[INFO] [stderr]     Checking object v0.23.0
[INFO] [stderr]     Checking weezl v0.1.4
[INFO] [stderr]     Checking bytemuck v1.5.0
[INFO] [stderr]     Checking prefix-tree v0.5.0
[INFO] [stderr]    Compiling crossbeam-utils v0.8.1
[INFO] [stderr]    Compiling num-integer v0.1.44
[INFO] [stderr]     Checking addr2line v0.14.1
[INFO] [stderr]     Checking deflate v0.8.6
[INFO] [stderr]     Checking itertools v0.10.0
[INFO] [stderr]     Checking fxhash v0.2.1
[INFO] [stderr]     Checking num-complex v0.2.4
[INFO] [stderr]     Checking crossbeam-epoch v0.8.2
[INFO] [stderr]     Checking crossbeam-channel v0.4.4
[INFO] [stderr]     Checking crossbeam-deque v0.7.3
[INFO] [stderr]     Checking png v0.16.8
[INFO] [stderr]     Checking gif v0.11.1
[INFO] [stderr]     Checking num-bigint v0.2.6
[INFO] [stderr]     Checking num-iter v0.1.42
[INFO] [stderr]     Checking num-rational v0.3.2
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking crossbeam-epoch v0.9.1
[INFO] [stderr]     Checking crossbeam-channel v0.5.0
[INFO] [stderr]     Checking num_cpus v1.13.0
[INFO] [stderr]     Checking getrandom v0.1.16
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking crossbeam-deque v0.8.0
[INFO] [stderr]     Checking colored v1.9.3
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rayon-core v1.9.0
[INFO] [stderr]     Checking num-rational v0.2.4
[INFO] [stderr]     Checking rand_chacha v0.2.2
[INFO] [stderr]     Checking num v0.2.1
[INFO] [stderr]     Checking rayon v1.5.0
[INFO] [stderr]     Checking rand v0.7.3
[INFO] [stderr]     Checking backtrace v0.3.56
[INFO] [stderr]    Compiling synstructure v0.12.4
[INFO] [stderr]     Checking jpeg-decoder v0.1.22
[INFO] [stderr]    Compiling failure_derive v0.1.8
[INFO] [stderr]     Checking tiff v0.6.1
[INFO] [stderr]     Checking image v0.23.13
[INFO] [stderr]     Checking failure v0.1.8
[INFO] [stderr]     Checking utils v0.1.0 (/opt/rustwide/workdir/utils)
[INFO] [stderr]  Documenting utils v0.1.0 (/opt/rustwide/workdir/utils)
[INFO] [stderr]  Documenting problems v0.1.0 (/opt/rustwide/workdir/problems)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]  --> problems/src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_option)]
[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 `problems`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name problems problems/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 colored=/opt/rustwide/target/debug/deps/libcolored-0eb61e80f1911276.rmeta --extern crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-801edc56f2803c70.rmeta --extern failure=/opt/rustwide/target/debug/deps/libfailure-190fac8bf51755b5.rmeta --extern fxhash=/opt/rustwide/target/debug/deps/libfxhash-262e12555f18d72a.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-fa7c3caa843a2e62.rmeta --extern itertools=/opt/rustwide/target/debug/deps/libitertools-9c436d67d12d7b9e.rmeta --extern num_integer=/opt/rustwide/target/debug/deps/libnum_integer-2c7491dd088a116e.rmeta --extern num_cpus=/opt/rustwide/target/debug/deps/libnum_cpus-28943b911766aeb9.rmeta --extern permutohedron=/opt/rustwide/target/debug/deps/libpermutohedron-48138127f651de89.rmeta --extern prefix_tree=/opt/rustwide/target/debug/deps/libprefix_tree-c8c5bb0382efc6a5.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-2f79a3b894d9a859.rmeta --extern utils=/opt/rustwide/target/debug/deps/libutils-407a297993b5c2ce.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "337a2a8744389500c4e6f374dd30662cfb44128ef3fda16ea6f85b55e5645e1b", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "337a2a8744389500c4e6f374dd30662cfb44128ef3fda16ea6f85b55e5645e1b", kill_on_drop: false }`
[INFO] [stdout] 337a2a8744389500c4e6f374dd30662cfb44128ef3fda16ea6f85b55e5645e1b
