[INFO] crate chessground 0.8.0 is already in cache
[INFO] checking chessground-0.8.0 against beta-2019-10-27 for pr-65897
[INFO] extracting crate chessground 0.8.0 into /workspace/builds/worker-13/source
[INFO] validating manifest of crates.io crate chessground 0.8.0 on toolchain beta-2019-10-27
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate chessground 0.8.0
[INFO] finished tweaking crates.io crate chessground 0.8.0
[INFO] tweaked toml for crates.io crate chessground 0.8.0 written to /workspace/builds/worker-13/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2019-10-27" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-13/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=allow" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2019-10-27" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 98a3f4552adde8a5a51930d3a02f3f82f937a216cbdd6ed27df0ca5f25799fa3
[INFO] running `"docker" "start" "-a" "98a3f4552adde8a5a51930d3a02f3f82f937a216cbdd6ed27df0ca5f25799fa3"`
[INFO] [stderr]    Compiling gio v0.4.1
[INFO] [stderr]    Compiling gdk-pixbuf v0.4.0
[INFO] [stderr]    Compiling cairo-rs v0.4.1
[INFO] [stderr]     Checking c_vec v1.3.3
[INFO] [stderr]    Compiling gdk v0.8.0
[INFO] [stderr]    Compiling gtk v0.4.1
[INFO] [stderr]    Compiling arrayvec v0.4.12
[INFO] [stderr]     Checking option-filter v1.0.2
[INFO] [stderr]    Compiling glib-sys v0.6.0
[INFO] [stderr]    Compiling gobject-sys v0.6.0
[INFO] [stderr]    Compiling gio-sys v0.6.0
[INFO] [stderr]    Compiling cairo-sys-rs v0.6.0
[INFO] [stderr]    Compiling gdk-pixbuf-sys v0.6.0
[INFO] [stderr]    Compiling pango-sys v0.6.0
[INFO] [stderr]    Compiling gdk-sys v0.6.0
[INFO] [stderr]    Compiling atk-sys v0.6.0
[INFO] [stderr]    Compiling gtk-sys v0.6.0
[INFO] [stderr]    Compiling rsvg-sys v0.6.0
[INFO] [stderr]    Compiling shakmaty v0.8.1
[INFO] [stderr]    Compiling syn v0.14.9
[INFO] [stderr]     Checking btoi v0.3.0
[INFO] [stderr]     Checking glib v0.5.0
[INFO] [stderr]     Checking pango v0.4.0
[INFO] [stderr]    Compiling relm-gen-widget v0.14.6
[INFO] [stderr]    Compiling relm-derive-common v0.14.6
[INFO] [stderr]    Compiling relm-derive v0.14.6
[INFO] [stderr]    Compiling relm-attributes v0.14.6
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/relm-attributes-0.14.6/src/lib.rs:22:1
[INFO] [stderr]    |
[INFO] [stderr] 22 | #![feature(proc_macro)]
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] error: aborting due to previous error
[INFO] [stderr] 
[INFO] [stderr] For more information about this error, try `rustc --explain E0554`.
[INFO] [stderr] error: could not compile `relm-attributes`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "98a3f4552adde8a5a51930d3a02f3f82f937a216cbdd6ed27df0ca5f25799fa3"`
[INFO] running `"docker" "rm" "-f" "98a3f4552adde8a5a51930d3a02f3f82f937a216cbdd6ed27df0ca5f25799fa3"`
[INFO] [stdout] 98a3f4552adde8a5a51930d3a02f3f82f937a216cbdd6ed27df0ca5f25799fa3