[INFO] cloning repository https://github.com/rchaser53/ro
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rchaser53/ro" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frchaser53%2Fro", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frchaser53%2Fro'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9cc5be6c50cc676cab6fb9783f1b30daeeae3d2e
[INFO] documenting rchaser53/ro against 1.46.0 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frchaser53%2Fro" "/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/rchaser53/ro on toolchain 1.46.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rchaser53/ro
[INFO] finished tweaking git repo https://github.com/rchaser53/ro
[INFO] tweaked toml for git repo https://github.com/rchaser53/ro written to /workspace/builds/worker-8/source/Cargo.toml
[INFO] crate git repo https://github.com/rchaser53/ro already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.46.0" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 4b848998238eafaf8eccc3281708ad10500a3e6ea7e9cb48341dff3183d5ca2d
[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" "4b848998238eafaf8eccc3281708ad10500a3e6ea7e9cb48341dff3183d5ca2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "4b848998238eafaf8eccc3281708ad10500a3e6ea7e9cb48341dff3183d5ca2d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4b848998238eafaf8eccc3281708ad10500a3e6ea7e9cb48341dff3183d5ca2d", kill_on_drop: false }`
[INFO] [stdout] 4b848998238eafaf8eccc3281708ad10500a3e6ea7e9cb48341dff3183d5ca2d
[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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+1.46.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 19d66f1df19736fdfa5afc4485a692d7a7f7e9ab43f8959ac336f0059273f119
[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" "19d66f1df19736fdfa5afc4485a692d7a7f7e9ab43f8959ac336f0059273f119", kill_on_drop: false }`
[INFO] [stderr]     Checking smallvec v1.1.0
[INFO] [stderr]    Compiling crossbeam-utils v0.7.0
[INFO] [stderr]    Compiling crossbeam-epoch v0.8.0
[INFO] [stderr]     Checking num_cpus v1.12.0
[INFO] [stderr]     Checking tokio v0.2.11
[INFO] [stderr]     Checking proc-macro2 v1.0.7
[INFO] [stderr]    Compiling serde_derive v1.0.104
[INFO] [stderr]     Checking unicode-normalization v0.1.11
[INFO] [stderr]     Checking quote v1.0.2
[INFO] [stderr]     Checking crossbeam-queue v0.2.1
[INFO] [stderr]     Checking crossbeam-channel v0.4.0
[INFO] [stderr]     Checking crossbeam-deque v0.7.2
[INFO] [stderr]     Checking syn v1.0.13
[INFO] [stderr]     Checking rayon-core v1.7.0
[INFO] [stderr]     Checking crossbeam v0.7.3
[INFO] [stderr]     Checking rayon v1.3.0
[INFO] [stderr]     Checking idna v0.2.0
[INFO] [stderr]     Checking url v2.1.1
[INFO] [stderr]     Checking serde_urlencoded v0.6.1
[INFO] [stderr]  Documenting ro 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:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(async_closure)]
[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 `ro`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustdoc --edition=2018 --crate-type bin --crate-name ro 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 crossbeam=/opt/rustwide/target/debug/deps/libcrossbeam-b2e6c0ce7a338025.rmeta --extern crossbeam_channel=/opt/rustwide/target/debug/deps/libcrossbeam_channel-6f6626dcb6ae4ef6.rmeta --extern dtoa=/opt/rustwide/target/debug/deps/libdtoa-b303293b917186a3.rmeta --extern itoa=/opt/rustwide/target/debug/deps/libitoa-5448203c85b532a7.rmeta --extern quote=/opt/rustwide/target/debug/deps/libquote-c8c30a9b588642e7.rmeta --extern rayon=/opt/rustwide/target/debug/deps/librayon-69f1f1ffbbbfb692.rmeta --extern serde=/opt/rustwide/target/debug/deps/libserde-ad08fc17c2d1843f.rmeta --extern serde_derive=/opt/rustwide/target/debug/deps/libserde_derive-722ddd9ed22d0d20.so --extern serde_urlencoded=/opt/rustwide/target/debug/deps/libserde_urlencoded-0ba538b4db0c5078.rmeta --extern syn=/opt/rustwide/target/debug/deps/libsyn-45fbe4d232b1d25c.rmeta --extern tokio=/opt/rustwide/target/debug/deps/libtokio-8b86641fb076f7b3.rmeta --extern url=/opt/rustwide/target/debug/deps/liburl-03c3a836794a9921.rmeta --cap-lints=warn` (exit code: 1)
[INFO] running `Command { std: "docker" "inspect" "19d66f1df19736fdfa5afc4485a692d7a7f7e9ab43f8959ac336f0059273f119", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "19d66f1df19736fdfa5afc4485a692d7a7f7e9ab43f8959ac336f0059273f119", kill_on_drop: false }`
[INFO] [stdout] 19d66f1df19736fdfa5afc4485a692d7a7f7e9ab43f8959ac336f0059273f119