[INFO] crate two-sided-vec 0.1.9 is already in cache
[INFO] testing two-sided-vec-0.1.9 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate two-sided-vec 0.1.9 into /workspace/builds/worker-14/source
[INFO] validating manifest of crates.io crate two-sided-vec 0.1.9 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 two-sided-vec 0.1.9
[INFO] finished tweaking crates.io crate two-sided-vec 0.1.9
[INFO] tweaked toml for crates.io crate two-sided-vec 0.1.9 written to /workspace/builds/worker-14/source/Cargo.toml
[INFO] running `"/workspace/cargo-home/bin/cargo" "+beta-2020-06-03" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[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-14/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-14/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] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] dc3e2f2851c1ffb8586e0847ecca804080581a392bf55d2373e32d10628274df
[INFO] running `"docker" "start" "-a" "dc3e2f2851c1ffb8586e0847ecca804080581a392bf55d2373e32d10628274df"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling two-sided-vec v0.1.9 (/opt/rustwide/workdir)
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]  --> src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | / #![feature(
[INFO] [stderr] 2 | |     dropck_eyepatch, // Needed to bypass dropchk
[INFO] [stderr] 3 | |     allocator_api, // We need to allocate raw memory
[INFO] [stderr] 4 | |     alloc_layout_extra, // We need to allocate memory
[INFO] [stderr] 5 | |     trusted_len, // Trusted length iterators improve performance
[INFO] [stderr] 6 | |     specialization, // Used to improve extend performance
[INFO] [stderr] 7 | | )]
[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 `two-sided-vec`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "dc3e2f2851c1ffb8586e0847ecca804080581a392bf55d2373e32d10628274df"`
[INFO] running `"docker" "rm" "-f" "dc3e2f2851c1ffb8586e0847ecca804080581a392bf55d2373e32d10628274df"`
[INFO] [stdout] dc3e2f2851c1ffb8586e0847ecca804080581a392bf55d2373e32d10628274df