[INFO] cloning repository https://github.com/Ameobea/advent-of-code-2018
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Ameobea/advent-of-code-2018" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeobea%2Fadvent-of-code-2018", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FAmeobea%2Fadvent-of-code-2018'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] ca253aeef8a2cc01609866a6e12a89038743b73f
[INFO] documenting Ameobea/advent-of-code-2018 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%2FAmeobea%2Fadvent-of-code-2018" "/workspace/builds/worker-6/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-6/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Ameobea/advent-of-code-2018 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/Ameobea/advent-of-code-2018
[INFO] finished tweaking git repo https://github.com/Ameobea/advent-of-code-2018
[INFO] tweaked toml for git repo https://github.com/Ameobea/advent-of-code-2018 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/Ameobea/advent-of-code-2018 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]  Downloading crates ...
[INFO] [stderr]   Downloaded nom v4.1.1
[INFO] [stderr]   Downloaded memchr v2.1.2
[INFO] [stderr]   Downloaded structopt-derive v0.2.14
[INFO] [stderr]   Downloaded z3 v0.3.0
[INFO] [stderr]   Downloaded structopt v0.2.14
[INFO] [stderr]   Downloaded packed_simd v0.3.1
[INFO] [stderr]   Downloaded cached v0.8.0
[INFO] [stderr]   Downloaded z3-sys v0.4.0
[INFO] [stderr]   Downloaded once_cell v0.1.6
[INFO] [stderr]   Downloaded time v0.1.41
[INFO] [stderr]   Downloaded pathfinding v1.1.10
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] [stdout] 8fa57950b7ef1101b32d5ca1a0a4d20cbac4123b028c4ee8f573f5124ebc9647
[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" "8fa57950b7ef1101b32d5ca1a0a4d20cbac4123b028c4ee8f573f5124ebc9647", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8fa57950b7ef1101b32d5ca1a0a4d20cbac4123b028c4ee8f573f5124ebc9647", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8fa57950b7ef1101b32d5ca1a0a4d20cbac4123b028c4ee8f573f5124ebc9647", kill_on_drop: false }`
[INFO] [stdout] 8fa57950b7ef1101b32d5ca1a0a4d20cbac4123b028c4ee8f573f5124ebc9647
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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] 9a3a9e9fa4b7b070dcf3bc8ea68d90b1394defb460bc6dad997c92f2a81a77ee
[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" "9a3a9e9fa4b7b070dcf3bc8ea68d90b1394defb460bc6dad997c92f2a81a77ee", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.45
[INFO] [stderr]     Checking cfg-if v0.1.6
[INFO] [stderr]    Compiling proc-macro2 v0.4.24
[INFO] [stderr]    Compiling arrayvec v0.4.10
[INFO] [stderr]    Compiling num-traits v0.2.6
[INFO] [stderr]    Compiling rayon-core v1.4.1
[INFO] [stderr]    Compiling num-integer v0.1.39
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]     Checking either v1.5.0
[INFO] [stderr]     Checking strsim v0.7.0
[INFO] [stderr]    Compiling rayon v1.0.3
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]     Checking ucd-util v0.1.3
[INFO] [stderr]     Checking utf8-ranges v1.0.2
[INFO] [stderr]     Checking z3-sys v0.4.0
[INFO] [stderr]     Checking indexmap v1.0.2
[INFO] [stderr]     Checking slab v0.4.1
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]     Checking lock_api v0.1.5
[INFO] [stderr]     Checking thread_local v0.3.6
[INFO] [stderr]     Checking textwrap v0.10.0
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]     Checking log v0.4.6
[INFO] [stderr]     Checking packed_simd v0.3.1
[INFO] [stderr]     Checking itertools v0.8.0
[INFO] [stderr]     Checking regex-syntax v0.6.4
[INFO] [stderr]     Checking smallvec v0.6.7
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling parking_lot_core v0.3.1
[INFO] [stderr]     Checking z3 v0.3.0
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]    Compiling quote v0.6.10
[INFO] [stderr]     Checking rand v0.5.5
[INFO] [stderr]     Checking atty v0.2.11
[INFO] [stderr]     Checking num_cpus v1.9.0
[INFO] [stderr]     Checking time v0.1.41
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]     Checking clap v2.32.0
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking aho-corasick v0.6.9
[INFO] [stderr]     Checking nom v4.1.1
[INFO] [stderr]     Checking pathfinding v1.1.10
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]    --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/packed_simd-0.3.1/src/lib.rs:202:1
[INFO] [stdout]     |
[INFO] [stdout] 202 | / #![feature(
[INFO] [stdout] 203 | |     repr_simd,
[INFO] [stdout] 204 | |     const_fn,
[INFO] [stdout] 205 | |     platform_intrinsics,
[INFO] [stdout] ...   |
[INFO] [stdout] 215 | |     custom_inner_attributes
[INFO] [stdout] 216 | | )]
[INFO] [stdout]     | |__^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking parking_lot v0.6.4
[INFO] [stderr]     Checking once_cell v0.1.6
[INFO] [stderr]     Checking cached v0.8.0
[INFO] [stderr]    Compiling structopt-derive v0.2.14
[INFO] [stderr]     Checking structopt v0.2.14
[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 compile `packed_simd`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `Command { std: "docker" "inspect" "9a3a9e9fa4b7b070dcf3bc8ea68d90b1394defb460bc6dad997c92f2a81a77ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9a3a9e9fa4b7b070dcf3bc8ea68d90b1394defb460bc6dad997c92f2a81a77ee", kill_on_drop: false }`
[INFO] [stdout] 9a3a9e9fa4b7b070dcf3bc8ea68d90b1394defb460bc6dad997c92f2a81a77ee