[INFO] cloning repository https://github.com/andrewdavidmackenzie/mandelbrot
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/andrewdavidmackenzie/mandelbrot" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandrewdavidmackenzie%2Fmandelbrot", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fandrewdavidmackenzie%2Fmandelbrot'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 156ccacdb66c2dfb48603bc1ba1b82e17ce07059
[INFO] documenting andrewdavidmackenzie/mandelbrot 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%2Fandrewdavidmackenzie%2Fmandelbrot" "/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/andrewdavidmackenzie/mandelbrot 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/andrewdavidmackenzie/mandelbrot
[INFO] finished tweaking git repo https://github.com/andrewdavidmackenzie/mandelbrot
[INFO] tweaked toml for git repo https://github.com/andrewdavidmackenzie/mandelbrot written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate git repo https://github.com/andrewdavidmackenzie/mandelbrot 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]     Blocking waiting for file lock on package cache
[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] 8ac873586071925c4e9d9fed95c0172c589c88922e7225b3b98611889acf2b5c
[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" "8ac873586071925c4e9d9fed95c0172c589c88922e7225b3b98611889acf2b5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8ac873586071925c4e9d9fed95c0172c589c88922e7225b3b98611889acf2b5c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8ac873586071925c4e9d9fed95c0172c589c88922e7225b3b98611889acf2b5c", kill_on_drop: false }`
[INFO] [stdout] 8ac873586071925c4e9d9fed95c0172c589c88922e7225b3b98611889acf2b5c
[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] 863c6aa2d68e75e418ded5cf55b874e6f1b5fa1a2b41b5aecb3ca22053187c02
[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" "863c6aa2d68e75e418ded5cf55b874e6f1b5fa1a2b41b5aecb3ca22053187c02", kill_on_drop: false }`
[INFO] [stderr]     Checking libc v0.2.33
[INFO] [stderr]     Checking num-traits v0.1.40
[INFO] [stderr]    Compiling cc v1.0.3
[INFO] [stderr]     Checking rustc-serialize v0.3.24
[INFO] [stderr]     Checking scopeguard v0.3.3
[INFO] [stderr]    Compiling rayon-core v1.3.0
[INFO] [stderr]     Checking either v1.4.0
[INFO] [stderr]     Checking color_quant v1.0.0
[INFO] [stderr]     Checking same-file v0.1.3
[INFO] [stderr]     Checking lzw v0.9.0
[INFO] [stderr]     Checking bitflags v0.3.3
[INFO] [stderr]     Checking inflate v0.1.1
[INFO] [stderr]     Checking byteorder v0.4.2
[INFO] [stderr]     Checking walkdir v1.0.7
[INFO] [stderr]     Checking coco v0.1.1
[INFO] [stderr]     Checking gif v0.7.0
[INFO] [stderr]     Checking dir-diff v0.2.0
[INFO] [stderr]     Checking rand v0.3.18
[INFO] [stderr]     Checking num_cpus v1.7.0
[INFO] [stderr]     Checking num-integer v0.1.35
[INFO] [stderr]     Checking enum_primitive v0.1.1
[INFO] [stderr]     Checking num-iter v0.1.34
[INFO] [stderr]    Compiling miniz-sys v0.1.10
[INFO] [stderr]     Checking tempdir v0.3.5
[INFO] [stderr]     Checking rayon v0.9.0
[INFO] [stderr]     Checking flate2 v0.2.20
[INFO] [stderr]     Checking png v0.4.3
[INFO] [stderr]     Checking num-bigint v0.1.40
[INFO] [stderr]     Checking num-complex v0.1.40
[INFO] [stderr]     Checking num-rational v0.1.40
[INFO] [stderr]     Checking num v0.1.40
[INFO] [stderr]     Checking image v0.6.1
[INFO] [stderr]  Documenting mandlebrot v3.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> src/main.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(test)]
[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 `mandlebrot`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name mandlebrot 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 dir_diff=/opt/rustwide/target/debug/deps/libdir_diff-d31c5bf7b6fe5ce7.rmeta --extern image=/opt/rustwide/target/debug/deps/libimage-a0333e975ab9100a.rmeta --extern num=/opt/rustwide/target/debug/deps/libnum-fd452f164df541c5.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-dc2233605a10d7f1.rmeta --extern tempdir=/opt/rustwide/target/debug/deps/libtempdir-0cc3071f269fa369.rmeta --cap-lints=warn --crate-version 3.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "863c6aa2d68e75e418ded5cf55b874e6f1b5fa1a2b41b5aecb3ca22053187c02", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "863c6aa2d68e75e418ded5cf55b874e6f1b5fa1a2b41b5aecb3ca22053187c02", kill_on_drop: false }`
[INFO] [stdout] 863c6aa2d68e75e418ded5cf55b874e6f1b5fa1a2b41b5aecb3ca22053187c02