[INFO] updating cached repository https://github.com/foldu/pickwp
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 134ec932509b4ad8410b71bdf337f053e32b2b47
[INFO] checking foldu/pickwp against beta-2019-10-27 for pr-65897
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffoldu%2Fpickwp" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/foldu/pickwp 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 git repo https://github.com/foldu/pickwp
[INFO] finished tweaking git repo https://github.com/foldu/pickwp
[INFO] tweaked toml for git repo https://github.com/foldu/pickwp written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/foldu/pickwp already has a lockfile, it will not be regenerated
[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-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" "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] acd4b6f87367c021303dc1493376e8a87ec9654055e81ab487c06d8bfe8cef3e
[INFO] running `"docker" "start" "-a" "acd4b6f87367c021303dc1493376e8a87ec9654055e81ab487c06d8bfe8cef3e"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking once_cell v0.2.4
[INFO] [stderr]     Checking slotmap v0.4.0
[INFO] [stderr]     Checking futures-channel-preview v0.3.0-alpha.19
[INFO] [stderr]     Checking tilde-expand v0.1.0 (https://github.com/foldu/tilde-expand?rev=8963d6673999c1284184ebf97c7be207e7d4b970#8963d667)
[INFO] [stderr]    Compiling syn v1.0.7
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]     Checking env_logger v0.7.1
[INFO] [stderr]    Compiling snafu-derive v0.5.0
[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/slotmap-0.4.0/src/lib.rs:4:35
[INFO] [stderr]   |
[INFO] [stderr] 4 | #![cfg_attr(feature = "unstable", feature(untagged_unions, try_reserve))]
[INFO] [stderr]   |                                   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling rand v0.7.2
[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 `slotmap`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "acd4b6f87367c021303dc1493376e8a87ec9654055e81ab487c06d8bfe8cef3e"`
[INFO] running `"docker" "rm" "-f" "acd4b6f87367c021303dc1493376e8a87ec9654055e81ab487c06d8bfe8cef3e"`
[INFO] [stdout] acd4b6f87367c021303dc1493376e8a87ec9654055e81ab487c06d8bfe8cef3e