[INFO] cloning repository https://github.com/rubytogether/kirby
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/rubytogether/kirby" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frubytogether%2Fkirby", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frubytogether%2Fkirby'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 9495d6a4fa5c64bdd42172396b089b56096e0c18
[INFO] documenting rubytogether/kirby against 1.54.0 for beta-1.55-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Frubytogether%2Fkirby" "/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/rubytogether/kirby on toolchain 1.54.0
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/rubytogether/kirby
[INFO] disabled cargo feature 'default-run' from git repo https://github.com/rubytogether/kirby
[INFO] finished tweaking git repo https://github.com/rubytogether/kirby
[INFO] tweaked toml for git repo https://github.com/rubytogether/kirby written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/rubytogether/kirby already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+1.54.0" "fetch" "--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-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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 687784a211c4addac23e095acfb5dd3645d56c41ab95ff8ab0738bafd9be6e80
[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" "687784a211c4addac23e095acfb5dd3645d56c41ab95ff8ab0738bafd9be6e80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "687784a211c4addac23e095acfb5dd3645d56c41ab95ff8ab0738bafd9be6e80", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "687784a211c4addac23e095acfb5dd3645d56c41ab95ff8ab0738bafd9be6e80", kill_on_drop: false }`
[INFO] [stdout] 687784a211c4addac23e095acfb5dd3645d56c41ab95ff8ab0738bafd9be6e80
[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" "ghcr.io/rust-lang/crates-build-env/linux@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+1.54.0" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 979b2eb9ecd6a215637cfc5783ed0e2bcceb43059b388bffce5833dfaa7fb598
[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" "979b2eb9ecd6a215637cfc5783ed0e2bcceb43059b388bffce5833dfaa7fb598", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling cc v1.0.22
[INFO] [stderr]     Checking futures v0.1.24
[INFO] [stderr]    Compiling proc-macro2 v0.4.13
[INFO] [stderr]     Checking lazycell v1.2.0
[INFO] [stderr]    Compiling ryu v0.2.5
[INFO] [stderr]    Compiling same-file v1.0.3
[INFO] [stderr]    Compiling bytecount v0.3.2
[INFO] [stderr]    Compiling rayon v1.0.2
[INFO] [stderr]     Checking md5 v0.3.8
[INFO] [stderr]     Checking array-macro v1.0.2
[INFO] [stderr]     Checking reexport-proc-macro v1.0.5
[INFO] [stderr]     Checking argparse v0.2.2
[INFO] [stderr]     Checking dirs v1.0.4
[INFO] [stderr]     Checking crossbeam-utils v0.2.2
[INFO] [stderr]    Compiling rand v0.4.3
[INFO] [stderr]     Checking xml-rs v0.7.0
[INFO] [stderr]     Checking nom v4.0.0
[INFO] [stderr]    Compiling serde v1.0.75
[INFO] [stderr]     Checking smallvec v0.6.5
[INFO] [stderr]    Compiling syn v0.11.11
[INFO] [stderr]    Compiling walkdir v2.2.5
[INFO] [stderr]     Checking bytes v0.4.10
[INFO] [stderr]     Checking serde_bytes v0.10.4
[INFO] [stderr]     Checking hashbrown v0.1.6
[INFO] [stderr]     Checking mio v0.6.16
[INFO] [stderr]    Compiling syn v0.13.11
[INFO] [stderr]     Checking crossbeam-epoch v0.3.1
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stdout]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/hashbrown-0.1.6/src/lib.rs:15:5
[INFO] [stdout]    |
[INFO] [stdout] 15 |     feature(alloc, alloc_layout_extra, allocator_api, ptr_offset_from, test, core_intrinsics)
[INFO] [stdout]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Checking digest v0.7.6
[INFO] [stderr]     Checking crypto-mac v0.5.2
[INFO] [stderr]     Checking regex v0.2.11
[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 `hashbrown`
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `Command { std: "docker" "inspect" "979b2eb9ecd6a215637cfc5783ed0e2bcceb43059b388bffce5833dfaa7fb598", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "979b2eb9ecd6a215637cfc5783ed0e2bcceb43059b388bffce5833dfaa7fb598", kill_on_drop: false }`
[INFO] [stdout] 979b2eb9ecd6a215637cfc5783ed0e2bcceb43059b388bffce5833dfaa7fb598
