[INFO] fetching crate mech 0.0.5...
[INFO] testing mech-0.0.5 against 1.44.0 for beta-1.45-1
[INFO] extracting crate mech 0.0.5 into /workspace/builds/worker-12/source
[INFO] validating manifest of crates.io crate mech 0.0.5 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 mech 0.0.5
[INFO] finished tweaking crates.io crate mech 0.0.5
[INFO] tweaked toml for crates.io crate mech 0.0.5 written to /workspace/builds/worker-12/source/Cargo.toml
[INFO] crate crates.io crate mech 0.0.5 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-12/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] [stdout] 3dcd55552953f73fbd0b3086d4ce3cd95e8a16df447162361ed222f244e5a15c
[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" "3dcd55552953f73fbd0b3086d4ce3cd95e8a16df447162361ed222f244e5a15c"`
[INFO] [stderr] sudo: setrlimit(RLIMIT_CORE): Operation not permitted
[INFO] [stderr]    Compiling syn v1.0.18
[INFO] [stderr]    Compiling futures-sink v0.3.4
[INFO] [stderr]    Compiling futures-io v0.3.4
[INFO] [stderr]    Compiling futures-task v0.3.4
[INFO] [stderr]    Compiling serde v1.0.106
[INFO] [stderr]    Compiling copyless v0.1.4
[INFO] [stderr]    Compiling once_cell v1.3.1
[INFO] [stderr]    Compiling ahash v0.3.4
[INFO] [stderr]    Compiling v_htmlescape v0.4.5
[INFO] [stderr]    Compiling backtrace-sys v0.1.37
[INFO] [stderr]    Compiling brotli-sys v0.3.2
[INFO] [stderr]    Compiling ring v0.16.13
[INFO] [stderr]    Compiling hashbrown v0.7.2
[INFO] [stderr]    Compiling bytestring v0.1.5
[INFO] [stderr]    Compiling input_buffer v0.3.1
[INFO] [stderr]    Compiling http v0.2.1
[INFO] [stderr]    Compiling nom v5.1.1
[INFO] [stderr]    Compiling futures-channel v0.3.4
[INFO] [stderr]    Compiling net2 v0.2.34
[INFO] [stderr]    Compiling signal-hook-registry v1.2.0
[INFO] [stderr]    Compiling parking_lot_core v0.7.2
[INFO] [stderr]    Compiling hostname v0.3.1
[INFO] [stderr]    Compiling socket2 v0.3.12
[INFO] [stderr]    Compiling threadpool v1.8.0
[INFO] [stderr]    Compiling colored v1.9.3
[INFO] [stderr]    Compiling clap v2.33.0
[INFO] [stderr]    Compiling openssl v0.10.29
[INFO] [stderr]    Compiling tokio-io v0.1.13
[INFO] [stderr]    Compiling http v0.1.21
[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/hashbrown-0.7.2/src/lib.rs:15:5
[INFO] [stderr]    |
[INFO] [stderr] 15 | /     feature(
[INFO] [stderr] 16 | |         alloc_layout_extra,
[INFO] [stderr] 17 | |         allocator_api,
[INFO] [stderr] 18 | |         ptr_offset_from,
[INFO] [stderr] ...  |
[INFO] [stderr] 22 | |         specialization,
[INFO] [stderr] 23 | |     )
[INFO] [stderr]    | |_____^
[INFO] [stderr] 
[INFO] [stderr]    Compiling publicsuffix v1.5.4
[INFO] [stderr]    Compiling lexical-core v0.6.2
[INFO] [stderr]    Compiling resolv-conf v0.6.3
[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 `hashbrown`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "3dcd55552953f73fbd0b3086d4ce3cd95e8a16df447162361ed222f244e5a15c"`
[INFO] running `"docker" "rm" "-f" "3dcd55552953f73fbd0b3086d4ce3cd95e8a16df447162361ed222f244e5a15c"`
[INFO] [stdout] 3dcd55552953f73fbd0b3086d4ce3cd95e8a16df447162361ed222f244e5a15c