[INFO] cloning repository https://github.com/redzic/alacritty-conf
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/redzic/alacritty-conf" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fredzic%2Falacritty-conf", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fredzic%2Falacritty-conf'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] a53233cf1d7d2e24923c6195b40fafa3bc9e09e3
[INFO] documenting redzic/alacritty-conf 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%2Fredzic%2Falacritty-conf" "/workspace/builds/worker-2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/redzic/alacritty-conf 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/redzic/alacritty-conf
[INFO] finished tweaking git repo https://github.com/redzic/alacritty-conf
[INFO] tweaked toml for git repo https://github.com/redzic/alacritty-conf written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/redzic/alacritty-conf 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 rgb v0.8.20
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] d9957d886ea3ace78a7ba4e5b67490e2492bc449c5f708abb5a41efc14115eb4
[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" "d9957d886ea3ace78a7ba4e5b67490e2492bc449c5f708abb5a41efc14115eb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "d9957d886ea3ace78a7ba4e5b67490e2492bc449c5f708abb5a41efc14115eb4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d9957d886ea3ace78a7ba4e5b67490e2492bc449c5f708abb5a41efc14115eb4", kill_on_drop: false }`
[INFO] [stdout] d9957d886ea3ace78a7ba4e5b67490e2492bc449c5f708abb5a41efc14115eb4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 4946b859e74ae72e9842539bd9b31fe51084bb409f9513ede33d9345b75b5f35
[INFO] running `Command { std: "docker" "start" "-a" "4946b859e74ae72e9842539bd9b31fe51084bb409f9513ede33d9345b75b5f35", kill_on_drop: false }`
[INFO] [stderr]    Compiling libc v0.2.74
[INFO] [stderr]    Compiling syn v1.0.36
[INFO] [stderr]     Checking bytemuck v1.3.1
[INFO] [stderr]     Checking cassowary v0.3.0
[INFO] [stderr]     Checking hex v0.4.2
[INFO] [stderr]    Compiling num-traits v0.2.12
[INFO] [stderr]    Compiling num-integer v0.1.43
[INFO] [stderr]    Compiling proc-macro-error-attr v1.0.4
[INFO] [stderr]     Checking rgb v0.8.20
[INFO] [stderr]     Checking atty v0.2.14
[INFO] [stderr]     Checking dirs-sys v0.3.5
[INFO] [stderr]     Checking time v0.1.43
[INFO] [stderr]     Checking termion v1.5.5
[INFO] [stderr]     Checking clap v2.33.1
[INFO] [stderr]     Checking dirs v3.0.1
[INFO] [stderr]     Checking tui v0.10.0
[INFO] [stderr]     Checking chrono v0.4.13
[INFO] [stderr]    Compiling proc-macro-error v1.0.4
[INFO] [stderr]    Compiling structopt-derive v0.4.9
[INFO] [stderr]     Checking structopt v0.3.16
[INFO] [stderr]  Documenting alacritty-conf 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:3:1
[INFO] [stdout]   |
[INFO] [stdout] 3 | #![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 `alacritty-conf`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name alacritty_conf 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-a8d79c8bf4c38f8e.rmeta --extern dirs=/opt/rustwide/target/debug/deps/libdirs-d83e65cc2276c17c.rmeta --extern hex=/opt/rustwide/target/debug/deps/libhex-b38b297ae8f34fd9.rmeta --extern rgb=/opt/rustwide/target/debug/deps/librgb-680c2b04ff0b038e.rmeta --extern structopt=/opt/rustwide/target/debug/deps/libstructopt-13ca49deb74d3513.rmeta --extern termcolor=/opt/rustwide/target/debug/deps/libtermcolor-a3bd6f83c7aef7c1.rmeta --extern termion=/opt/rustwide/target/debug/deps/libtermion-2a093a60194abe2c.rmeta --extern tui=/opt/rustwide/target/debug/deps/libtui-72745117b48c4f35.rmeta --extern yaml_rust=/opt/rustwide/target/debug/deps/libyaml_rust-477942c49c77f6fc.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "4946b859e74ae72e9842539bd9b31fe51084bb409f9513ede33d9345b75b5f35", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4946b859e74ae72e9842539bd9b31fe51084bb409f9513ede33d9345b75b5f35", kill_on_drop: false }`
[INFO] [stdout] 4946b859e74ae72e9842539bd9b31fe51084bb409f9513ede33d9345b75b5f35