[INFO] updating cached repository https://github.com/koivunej/readpcap
[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] aafc6d9e031a62cbf7ee9ef297d655e65c1d6e74
[INFO] checking koivunej/readpcap against beta-2019-10-27 for pr-65897
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkoivunej%2Freadpcap" "/workspace/builds/worker-4/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/koivunej/readpcap 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/koivunej/readpcap
[INFO] removed 0 missing examples
[INFO] finished tweaking git repo https://github.com/koivunej/readpcap
[INFO] tweaked toml for git repo https://github.com/koivunej/readpcap written to /workspace/builds/worker-4/source/Cargo.toml
[INFO] crate git repo https://github.com/koivunej/readpcap 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4/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] 7d7b77cc2bc5213b09a1f511574342a636ebdcce57a0563ce6aaa71f11fe590f
[INFO] running `"docker" "start" "-a" "7d7b77cc2bc5213b09a1f511574342a636ebdcce57a0563ce6aaa71f11fe590f"`
[INFO] [stderr]     Checking futures v0.1.13
[INFO] [stderr]     Checking iovec v0.1.0
[INFO] [stderr]     Checking net2 v0.2.29
[INFO] [stderr]     Checking uuid v0.2.3
[INFO] [stderr]    Compiling derive_more v0.6.2
[INFO] [stderr]    Compiling derive-into-owned v0.1.0
[INFO] [stderr]     Checking error-chain v0.8.1
[INFO] [stderr]     Checking bytes v0.4.3
[INFO] [stderr]     Checking quick-protobuf v0.5.0
[INFO] [stderr]     Checking mio v0.6.8
[INFO] [stderr]     Checking tokio-io v0.1.1
[INFO] [stderr]     Checking tokio-service v0.1.0
[INFO] [stderr]     Checking tokio-core v0.1.7
[INFO] [stderr]     Checking readpcap v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking tokio-proto v0.1.1 (https://github.com/koivunej/tokio-proto.git?branch=generic-requestid#15312a57)
[INFO] [stderr]     Checking eventstore-tcp v0.2.0 (https://github.com/koivunej/eventstore-tcp.git#447d86b9)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]   --> /opt/rustwide/cargo-home/git/checkouts/eventstore-tcp-4efe7b067b1df611/447d86b/src/lib.rs:82:1
[INFO] [stderr]    |
[INFO] [stderr] 82 | #![feature(try_from)]
[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 `eventstore-tcp`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7d7b77cc2bc5213b09a1f511574342a636ebdcce57a0563ce6aaa71f11fe590f"`
[INFO] running `"docker" "rm" "-f" "7d7b77cc2bc5213b09a1f511574342a636ebdcce57a0563ce6aaa71f11fe590f"`
[INFO] [stdout] 7d7b77cc2bc5213b09a1f511574342a636ebdcce57a0563ce6aaa71f11fe590f