[INFO] cloning repository https://github.com/KeenS/rayon-playground
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/KeenS/rayon-playground" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeenS%2Frayon-playground", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FKeenS%2Frayon-playground'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 933bee591c0ad124577ad0cf2be2967d4681386d
[INFO] documenting KeenS/rayon-playground 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%2FKeenS%2Frayon-playground" "/workspace/builds/worker-7/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/KeenS/rayon-playground 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/KeenS/rayon-playground
[INFO] finished tweaking git repo https://github.com/KeenS/rayon-playground
[INFO] tweaked toml for git repo https://github.com/KeenS/rayon-playground written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/KeenS/rayon-playground 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] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded crossbeam-deque v0.2.0
[INFO] [stderr]   Downloaded either v1.5.0
[INFO] [stderr]   Downloaded rand v0.4.2
[INFO] [stderr]   Downloaded nodrop v0.1.12
[INFO] [stderr]   Downloaded crossbeam-utils v0.2.2
[INFO] [stderr]   Downloaded rayon v1.0.1
[INFO] [stderr]   Downloaded crossbeam-epoch v0.3.1
[INFO] [stderr]   Downloaded libc v0.2.40
[INFO] [stderr]   Downloaded rayon-core v1.4.0
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] 1bfb05d2a406546853cc8565445986e62a49ede132b9c9a1bacc22aea1408afb
[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" "1bfb05d2a406546853cc8565445986e62a49ede132b9c9a1bacc22aea1408afb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "1bfb05d2a406546853cc8565445986e62a49ede132b9c9a1bacc22aea1408afb", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1bfb05d2a406546853cc8565445986e62a49ede132b9c9a1bacc22aea1408afb", kill_on_drop: false }`
[INFO] [stdout] 1bfb05d2a406546853cc8565445986e62a49ede132b9c9a1bacc22aea1408afb
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] aae8c586e2cd548d079906fa769e9d8e5db42b4dfe9eb7548e82e7f7c739cbc9
[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" "aae8c586e2cd548d079906fa769e9d8e5db42b4dfe9eb7548e82e7f7c739cbc9", kill_on_drop: false }`
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking crossbeam-deque v0.2.0
[INFO] [stderr]     Checking rayon-core v1.4.0
[INFO] [stderr]     Checking rayon v1.0.1
[INFO] [stderr]  Documenting rayon-playground 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(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 `rayon-playground`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --crate-type bin --crate-name rayon_playground 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 rand=/opt/rustwide/target/debug/deps/librand-1066a1ff4eb06502.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-9710d048f48553f5.rmeta --cap-lints=warn --crate-version 0.1.0` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "aae8c586e2cd548d079906fa769e9d8e5db42b4dfe9eb7548e82e7f7c739cbc9", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "aae8c586e2cd548d079906fa769e9d8e5db42b4dfe9eb7548e82e7f7c739cbc9", kill_on_drop: false }`
[INFO] [stdout] aae8c586e2cd548d079906fa769e9d8e5db42b4dfe9eb7548e82e7f7c739cbc9