[INFO] fetching crate serde-pickle 0.5.1...
[INFO] checking serde-pickle-0.5.1 against beta-2019-10-27 for pr-65897
[INFO] extracting crate serde-pickle 0.5.1 into /workspace/builds/worker-1/source
[INFO] validating manifest of crates.io crate serde-pickle 0.5.1 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 serde-pickle 0.5.1
[INFO] finished tweaking crates.io crate serde-pickle 0.5.1
[INFO] tweaked toml for crates.io crate serde-pickle 0.5.1 written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate crates.io crate serde-pickle 0.5.1 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-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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] b15f32be99709e7b77a4926af614ff209dcf6520633bc69d4555b4707d33b6a1
[INFO] running `"docker" "start" "-a" "b15f32be99709e7b77a4926af614ff209dcf6520633bc69d4555b4707d33b6a1"`
[INFO] [stderr]     Checking iter-read v0.2.0
[INFO] [stderr]    Compiling num-integer v0.1.41
[INFO] [stderr]    Compiling num-bigint v0.2.3
[INFO] [stderr]     Checking getrandom v0.1.12
[INFO] [stderr]     Checking serde_json v1.0.40
[INFO] [stderr]     Checking env_logger v0.6.2
[INFO] [stderr]    Compiling serde_derive v1.0.101
[INFO] [stderr]     Checking rand_core v0.5.1
[INFO] [stderr]     Checking rand_chacha v0.2.1
[INFO] [stderr]     Checking rand v0.7.2
[INFO] [stderr]     Checking quickcheck v0.9.0
[INFO] [stderr]     Checking serde-pickle v0.5.1 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> src/lib.rs:53:19
[INFO] [stderr]    |
[INFO] [stderr] 53 | #![cfg_attr(test, feature(test))]
[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 `serde-pickle`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "b15f32be99709e7b77a4926af614ff209dcf6520633bc69d4555b4707d33b6a1"`
[INFO] running `"docker" "rm" "-f" "b15f32be99709e7b77a4926af614ff209dcf6520633bc69d4555b4707d33b6a1"`
[INFO] [stdout] b15f32be99709e7b77a4926af614ff209dcf6520633bc69d4555b4707d33b6a1