[INFO] crate persy 0.9.0 is already in cache
[INFO] testing persy-0.9.0 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate persy 0.9.0 into /workspace/builds/worker-7/source
[INFO] validating manifest of crates.io crate persy 0.9.0 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 persy 0.9.0
[INFO] finished tweaking crates.io crate persy 0.9.0
[INFO] tweaked toml for crates.io crate persy 0.9.0 written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate crates.io crate persy 0.9.0 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-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=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] ea7e33ddb16fc5ac298b802f2824845fc587fa46bba7eb79515f3e0f7bae4454
[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" "ea7e33ddb16fc5ac298b802f2824845fc587fa46bba7eb79515f3e0f7bae4454"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling unsigned-varint v0.3.1
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling persy v0.9.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused return value of `std::vec::Vec::<T>::split_off` that must be used
[INFO] [stderr]    --> src/snapshot.rs:355:29
[INFO] [stderr]     |
[INFO] [stderr] 355 | ...                   v.split_off(index);
[INFO] [stderr]     |                       ^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_must_use)]` on by default
[INFO] [stderr]     = note: use `.truncate()` if you don't need the other half
[INFO] [stderr] 
[INFO] [stderr] error: could not compile `persy`.
[INFO] [stderr] 
[INFO] [stderr] Caused by:
[INFO] [stderr]   process didn't exit successfully: `rustc --crate-name persy --edition=2018 src/lib.rs --error-format=json --json=diagnostic-rendered-ansi --crate-type lib --emit=dep-info,metadata,link -Cembed-bitcode=no -C debuginfo=2 -C metadata=9db7fdd564731497 -C extra-filename=-9db7fdd564731497 --out-dir /opt/rustwide/target/debug/deps -L dependency=/opt/rustwide/target/debug/deps --extern byteorder=/opt/rustwide/target/debug/deps/libbyteorder-78580fbf595daae7.rmeta --extern crc=/opt/rustwide/target/debug/deps/libcrc-28b8d347293ae474.rmeta --extern data_encoding=/opt/rustwide/target/debug/deps/libdata_encoding-9154cb59b7e77f50.rmeta --extern fs2=/opt/rustwide/target/debug/deps/libfs2-0ad0e4e333d69422.rmeta --extern linked_hash_map=/opt/rustwide/target/debug/deps/liblinked_hash_map-7f0e530bd389a825.rmeta --extern rand=/opt/rustwide/target/debug/deps/librand-8ff17c45058c42aa.rmeta --extern unsigned_varint=/opt/rustwide/target/debug/deps/libunsigned_varint-166dd408a6889486.rmeta --cap-lints=warn` (signal: 9, SIGKILL: kill)
[INFO] running `"docker" "inspect" "ea7e33ddb16fc5ac298b802f2824845fc587fa46bba7eb79515f3e0f7bae4454"`
[INFO] running `"docker" "rm" "-f" "ea7e33ddb16fc5ac298b802f2824845fc587fa46bba7eb79515f3e0f7bae4454"`
[INFO] [stdout] ea7e33ddb16fc5ac298b802f2824845fc587fa46bba7eb79515f3e0f7bae4454