[INFO] crate particle-xenon 0.0.1 is already in cache
[INFO] testing particle-xenon-0.0.1 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate particle-xenon 0.0.1 into /workspace/builds/worker-10/source
[INFO] validating manifest of crates.io crate particle-xenon 0.0.1 on toolchain beta-2020-06-03
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate particle-xenon 0.0.1
[INFO] finished tweaking crates.io crate particle-xenon 0.0.1
[INFO] tweaked toml for crates.io crate particle-xenon 0.0.1 written to /workspace/builds/worker-10/source/Cargo.toml
[INFO] crate crates.io crate particle-xenon 0.0.1 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-10/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=warn" "-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-2020-06-03" "build" "--frozen"`
[INFO] [stdout] ff0e94a4977dbb6dcfba8b142cd03eecaaa7fa7f1140b7ffc0320b4a8093abf7
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "ff0e94a4977dbb6dcfba8b142cd03eecaaa7fa7f1140b7ffc0320b4a8093abf7"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling rand_core v0.4.2
[INFO] [stderr]    Compiling cortex-m-rt v0.6.10
[INFO] [stderr]    Compiling cortex-m v0.6.0
[INFO] [stderr]    Compiling vcell v0.1.0
[INFO] [stderr]    Compiling fpa v0.1.0
[INFO] [stderr]    Compiling nrf52840-pac v0.8.0
[INFO] [stderr]    Compiling cast v0.2.2
[INFO] [stderr]    Compiling nrf52840-hal v0.8.1
[INFO] [stderr]    Compiling bare-metal v0.2.4
[INFO] [stderr]    Compiling as-slice v0.1.0
[INFO] [stderr]    Compiling volatile-register v0.2.0
[INFO] [stderr]    Compiling rand_core v0.3.1
[INFO] [stderr]    Compiling rand v0.5.6
[INFO] [stderr]    Compiling aligned v0.3.1
[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/cortex-m-0.6.0/src/lib.rs:33:37
[INFO] [stderr]    |
[INFO] [stderr] 33 | #![cfg_attr(feature = "inline-asm", feature(asm))]
[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 `cortex-m`.
[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 `"docker" "inspect" "ff0e94a4977dbb6dcfba8b142cd03eecaaa7fa7f1140b7ffc0320b4a8093abf7"`
[INFO] running `"docker" "rm" "-f" "ff0e94a4977dbb6dcfba8b142cd03eecaaa7fa7f1140b7ffc0320b4a8093abf7"`
[INFO] [stdout] ff0e94a4977dbb6dcfba8b142cd03eecaaa7fa7f1140b7ffc0320b4a8093abf7