[INFO] fetching crate mutagen-plugin 0.1.2...
[INFO] testing mutagen-plugin-0.1.2 against beta-2020-06-03 for beta-1.45-1
[INFO] extracting crate mutagen-plugin 0.1.2 into /workspace/builds/worker-2/source
[INFO] validating manifest of crates.io crate mutagen-plugin 0.1.2 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 mutagen-plugin 0.1.2
[INFO] finished tweaking crates.io crate mutagen-plugin 0.1.2
[INFO] tweaked toml for crates.io crate mutagen-plugin 0.1.2 written to /workspace/builds/worker-2/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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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] d55c92f67862a931e0b66e2ae1a8035dd6eef437cd9da499bc4d43201c99e51a
[INFO] running `"docker" "start" "-a" "d55c92f67862a931e0b66e2ae1a8035dd6eef437cd9da499bc4d43201c99e51a"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling mutagen v0.1.2
[INFO] [stderr]    Compiling bitflags v1.2.1
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling mutagen-plugin v0.1.2 (/opt/rustwide/workdir)
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> build.rs:15:30
[INFO] [stderr]    |
[INFO] [stderr] 15 | fn write_binop_arm(out: &mut Write,
[INFO] [stderr]    |                              ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(bare_trait_objects)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: trait objects without an explicit `dyn` are deprecated
[INFO] [stderr]   --> build.rs:59:33
[INFO] [stderr]    |
[INFO] [stderr] 59 | fn write_opassign_arm(out: &mut Write,
[INFO] [stderr]    |                                 ^^^^^ help: use `dyn`: `dyn Write`
[INFO] [stderr] 
[INFO] [stderr] warning: 2 warnings emitted
[INFO] [stderr] 
[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/mutagen-0.1.2/src/lib.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | #![feature(specialization, atomic_min_max, try_from, assoc_unix_epoch)]
[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 `mutagen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "d55c92f67862a931e0b66e2ae1a8035dd6eef437cd9da499bc4d43201c99e51a"`
[INFO] running `"docker" "rm" "-f" "d55c92f67862a931e0b66e2ae1a8035dd6eef437cd9da499bc4d43201c99e51a"`
[INFO] [stdout] d55c92f67862a931e0b66e2ae1a8035dd6eef437cd9da499bc4d43201c99e51a