[INFO] fetching crate muta-apm 0.1.0-alpha.15...
[INFO] testing muta-apm-0.1.0-alpha.15 against 1.44.0 for beta-1.45-1
[INFO] extracting crate muta-apm 0.1.0-alpha.15 into /workspace/builds/worker-6/source
[INFO] validating manifest of crates.io crate muta-apm 0.1.0-alpha.15 on toolchain 1.44.0
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking crates.io crate muta-apm 0.1.0-alpha.15
[INFO] finished tweaking crates.io crate muta-apm 0.1.0-alpha.15
[INFO] tweaked toml for crates.io crate muta-apm 0.1.0-alpha.15 written to /workspace/builds/worker-6/source/Cargo.toml
[INFO] crate crates.io crate muta-apm 0.1.0-alpha.15 already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+1.44.0" "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-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.44.0" "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] 77e796c38fc9ad783111590b8e2fd78e3921f6cf9057db799101d59fac5c25c4
[INFO] running `"docker" "start" "-a" "77e796c38fc9ad783111590b8e2fd78e3921f6cf9057db799101d59fac5c25c4"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling proc-macro2 v1.0.12
[INFO] [stderr]    Compiling libc v0.2.70
[INFO] [stderr]    Compiling syn v1.0.21
[INFO] [stderr]    Compiling autocfg v1.0.0
[INFO] [stderr]    Compiling maybe-uninit v2.0.0
[INFO] [stderr]    Compiling gimli v0.21.0
[INFO] [stderr]    Compiling byteorder v1.3.4
[INFO] [stderr]    Compiling serde v1.0.110
[INFO] [stderr]    Compiling ryu v1.0.4
[INFO] [stderr]    Compiling lazy_static v1.4.0
[INFO] [stderr]    Compiling rustc-demangle v0.1.16
[INFO] [stderr]    Compiling object v0.19.0
[INFO] [stderr]    Compiling match_cfg v0.1.0
[INFO] [stderr]    Compiling log v0.4.8
[INFO] [stderr]    Compiling smallvec v1.4.0
[INFO] [stderr]    Compiling scopeguard v1.1.0
[INFO] [stderr]    Compiling itoa v0.4.5
[INFO] [stderr]    Compiling dyn-clone v1.0.1
[INFO] [stderr]    Compiling percent-encoding v2.1.0
[INFO] [stderr]    Compiling lock_api v0.3.4
[INFO] [stderr]    Compiling creep v0.2.2
[INFO] [stderr]    Compiling crossbeam-utils v0.7.2
[INFO] [stderr]    Compiling getrandom v0.1.14
[INFO] [stderr]    Compiling hostname v0.3.1
[INFO] [stderr]    Compiling parking_lot_core v0.7.2
[INFO] [stderr]    Compiling quote v1.0.5
[INFO] [stderr]    Compiling rand_core v0.5.1
[INFO] [stderr]    Compiling crossbeam-channel v0.4.2
[INFO] [stderr]    Compiling parking_lot v0.10.2
[INFO] [stderr]    Compiling rand_chacha v0.2.2
[INFO] [stderr]    Compiling rand v0.7.3
[INFO] [stderr]    Compiling addr2line v0.12.0
[INFO] [stderr]    Compiling backtrace v0.3.47
[INFO] [stderr]    Compiling trackable_derive v0.1.3
[INFO] [stderr]    Compiling serde_derive v1.0.110
[INFO] [stderr]    Compiling trackable v0.2.23
[INFO] [stderr]    Compiling thrift_codec v0.1.1
[INFO] [stderr]    Compiling rustracing v0.4.0
[INFO] [stderr]    Compiling rustracing_jaeger v0.4.1
[INFO] [stderr]    Compiling serde_json v1.0.53
[INFO] [stderr]    Compiling muta-apm-derive v0.1.0-alpha.12
[INFO] [stderr]    Compiling muta-apm v0.1.0-alpha.15 (/opt/rustwide/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 23s
[INFO] running `"docker" "inspect" "77e796c38fc9ad783111590b8e2fd78e3921f6cf9057db799101d59fac5c25c4"`
[INFO] running `"docker" "rm" "-f" "77e796c38fc9ad783111590b8e2fd78e3921f6cf9057db799101d59fac5c25c4"`
[INFO] [stdout] 77e796c38fc9ad783111590b8e2fd78e3921f6cf9057db799101d59fac5c25c4
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-6/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" "+1.44.0" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 1ee01dc4c5a5a89eb435aaf4faf0e9127107a5b89169ffd0f0e6ddbee26495b9
[INFO] running `"docker" "start" "-a" "1ee01dc4c5a5a89eb435aaf4faf0e9127107a5b89169ffd0f0e6ddbee26495b9"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling memchr v2.3.3
[INFO] [stderr]    Compiling proc-macro-nested v0.1.4
[INFO] [stderr]    Compiling once_cell v1.3.1
[INFO] [stderr]    Compiling proc-macro-hack v0.5.15
[INFO] [stderr]    Compiling futures-core v0.3.5
[INFO] [stderr]    Compiling futures-sink v0.3.5
[INFO] [stderr]    Compiling pin-utils v0.1.0
[INFO] [stderr]    Compiling futures-io v0.3.5
[INFO] [stderr]    Compiling slab v0.4.2
[INFO] [stderr]    Compiling pin-project-lite v0.1.5
[INFO] [stderr]    Compiling bit-vec v0.6.2
[INFO] [stderr]    Compiling hex v0.4.2
[INFO] [stderr]    Compiling futures-timer v3.0.2
[INFO] [stderr]    Compiling rand v0.4.6
[INFO] [stderr]    Compiling num_cpus v1.13.0
[INFO] [stderr]    Compiling pin-project-internal v0.4.16
[INFO] [stderr]    Compiling tokio-macros v0.2.5
[INFO] [stderr]    Compiling derive_more v0.99.5
[INFO] [stderr]    Compiling async-trait v0.1.31
[INFO] [stderr]    Compiling rand_pcg v0.2.1
[INFO] [stderr]    Compiling futures-channel v0.3.5
[INFO] [stderr]    Compiling futures-task v0.3.5
[INFO] [stderr]    Compiling bytes v0.5.4
[INFO] [stderr]    Compiling moodyblues-sdk v0.3.0
[INFO] [stderr]    Compiling rand v0.3.23
[INFO] [stderr]    Compiling libmath v0.1.4
[INFO] [stderr]    Compiling prime_tools v0.2.2
[INFO] [stderr]    Compiling futures-macro v0.3.5
[INFO] [stderr]    Compiling tokio v0.2.20
[INFO] [stderr]    Compiling pin-project v0.4.16
[INFO] [stderr]    Compiling futures-util v0.3.5
[INFO] [stderr]    Compiling futures-executor v0.3.5
[INFO] [stderr]    Compiling futures v0.3.5
[INFO] [stderr]    Compiling overlord v0.2.0-alpha.13
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the stable release channel
[INFO] [stderr]  --> /opt/rustwide/cargo-home/registry/src/github.com-1ecc6299db9ec823/overlord-0.2.0-alpha.13/src/lib.rs:8:1
[INFO] [stderr]   |
[INFO] [stderr] 8 | #![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 `overlord`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "1ee01dc4c5a5a89eb435aaf4faf0e9127107a5b89169ffd0f0e6ddbee26495b9"`
[INFO] running `"docker" "rm" "-f" "1ee01dc4c5a5a89eb435aaf4faf0e9127107a5b89169ffd0f0e6ddbee26495b9"`
[INFO] [stdout] 1ee01dc4c5a5a89eb435aaf4faf0e9127107a5b89169ffd0f0e6ddbee26495b9