[INFO] fetching crate exar-net 0.1.0...
[INFO] checking exar-net-0.1.0 against beta for pr-78714
[INFO] extracting crate exar-net 0.1.0 into /workspace/builds/worker-0/source
[INFO] validating manifest of crates.io crate exar-net 0.1.0 on toolchain beta
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] started tweaking crates.io crate exar-net 0.1.0
[INFO] removed path dependency exar from crates.io crate exar-net 0.1.0
[INFO] removed path dependency exar-testkit from crates.io crate exar-net 0.1.0
[INFO] finished tweaking crates.io crate exar-net 0.1.0
[INFO] tweaked toml for crates.io crate exar-net 0.1.0 written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update", kill_on_drop: false }`
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta" "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-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 0dbba80e077b4b0d9adc862bc3f83a6a7dfc78a41cc21ead641df2bf569aaebd
[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" "0dbba80e077b4b0d9adc862bc3f83a6a7dfc78a41cc21ead641df2bf569aaebd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "0dbba80e077b4b0d9adc862bc3f83a6a7dfc78a41cc21ead641df2bf569aaebd", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "0dbba80e077b4b0d9adc862bc3f83a6a7dfc78a41cc21ead641df2bf569aaebd", kill_on_drop: false }`
[INFO] [stdout] 0dbba80e077b4b0d9adc862bc3f83a6a7dfc78a41cc21ead641df2bf569aaebd
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/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" "RUSTFLAGS=--cap-lints=forbid" "-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" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 9820e531b808f897944bd8af79e5efc4b8ba6a10f1ce42a60e47b29620eec26d
[INFO] running `Command { std: "docker" "start" "-a" "9820e531b808f897944bd8af79e5efc4b8ba6a10f1ce42a60e47b29620eec26d", kill_on_drop: false }`
[INFO] [stderr]     Checking indexed-line-reader v0.2.1
[INFO] [stderr]     Checking log v0.3.9
[INFO] [stderr]     Checking exar-testkit v0.1.0
[INFO] [stdout] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stdout]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/exar-testkit-0.1.0/src/lib.rs:1:1
[INFO] [stdout]   |
[INFO] [stdout] 1 | #![feature(const_fn)]
[INFO] [stdout]   | ^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[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 `exar-testkit`
[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" "9820e531b808f897944bd8af79e5efc4b8ba6a10f1ce42a60e47b29620eec26d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "9820e531b808f897944bd8af79e5efc4b8ba6a10f1ce42a60e47b29620eec26d", kill_on_drop: false }`
[INFO] [stdout] 9820e531b808f897944bd8af79e5efc4b8ba6a10f1ce42a60e47b29620eec26d