[INFO] cloning repository https://github.com/Emerentius/advent_of_code_2019
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Emerentius/advent_of_code_2019" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmerentius%2Fadvent_of_code_2019", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FEmerentius%2Fadvent_of_code_2019'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] bbfb570cf2bd66ec5aeec9b52de4e894d456804f
[INFO] documenting Emerentius/advent_of_code_2019 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%2FEmerentius%2Fadvent_of_code_2019" "/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/Emerentius/advent_of_code_2019 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/Emerentius/advent_of_code_2019
[INFO] finished tweaking git repo https://github.com/Emerentius/advent_of_code_2019
[INFO] tweaked toml for git repo https://github.com/Emerentius/advent_of_code_2019 written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/Emerentius/advent_of_code_2019 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]  Downloading crates ...
[INFO] [stderr]   Downloaded num-traits v0.2.10
[INFO] [stderr]   Downloaded num v0.2.0
[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:d190cb871061d98bc6d0581d85cb2ecb09a0f8a142ba5463de30be9999fc3251" "/opt/rustwide/cargo-home/bin/cargo" "+1.61.0" "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] 831cc5f50055e52091117d55b09b4556e7289459e0d62f24daaa013da8db9340
[INFO] running `Command { std: "docker" "start" "-a" "831cc5f50055e52091117d55b09b4556e7289459e0d62f24daaa013da8db9340", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "831cc5f50055e52091117d55b09b4556e7289459e0d62f24daaa013da8db9340", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "831cc5f50055e52091117d55b09b4556e7289459e0d62f24daaa013da8db9340", kill_on_drop: false }`
[INFO] [stdout] 831cc5f50055e52091117d55b09b4556e7289459e0d62f24daaa013da8db9340
[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: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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 784322a0e3f75e6bc986d31944eac3976f232e3788c39130f73f1f06dd53f85e
[INFO] running `Command { std: "docker" "start" "-a" "784322a0e3f75e6bc986d31944eac3976f232e3788c39130f73f1f06dd53f85e", kill_on_drop: false }`
[INFO] [stderr]     Checking permutohedron v0.2.4
[INFO] [stderr]     Checking ord_subset v3.1.1
[INFO] [stderr]    Compiling num-traits v0.2.10
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.3
[INFO] [stderr]    Compiling num-rational v0.2.2
[INFO] [stderr]    Compiling num-iter v0.1.39
[INFO] [stderr]    Compiling num-complex v0.2.3
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking itertools v0.8.2
[INFO] [stderr]     Checking regex v1.3.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]  Documenting advent_of_code_2019 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:2:12
[INFO] [stdout]   |
[INFO] [stdout] 2 | #![feature(test)]
[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 `advent_of_code_2019`
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name advent_of_code_2019 src/main.rs -o /opt/rustwide/target/doc --error-format=json --json=diagnostic-rendered-ansi,artifacts,future-incompat --document-private-items -C metadata=b965198c2c393306 -L dependency=/opt/rustwide/target/debug/deps --extern itertools=/opt/rustwide/target/debug/deps/libitertools-e5549dd9882595b3.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-1cad40677ccb2a02.rmeta --extern ord_subset=/opt/rustwide/target/debug/deps/libord_subset-b3d22b3099140157.rmeta --extern permutohedron=/opt/rustwide/target/debug/deps/libpermutohedron-8daffba78bd82069.rmeta --extern regex=/opt/rustwide/target/debug/deps/libregex-ad67a126fc29a526.rmeta --extern textwrap=/opt/rustwide/target/debug/deps/libtextwrap-9144d338dcb05d71.rmeta --cap-lints=warn --crate-version 0.1.0` (exit status: 1)
[INFO] running `Command { std: "docker" "inspect" "784322a0e3f75e6bc986d31944eac3976f232e3788c39130f73f1f06dd53f85e", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "784322a0e3f75e6bc986d31944eac3976f232e3788c39130f73f1f06dd53f85e", kill_on_drop: false }`
[INFO] [stdout] 784322a0e3f75e6bc986d31944eac3976f232e3788c39130f73f1f06dd53f85e