[INFO] updating cached repository rabbit-ci/worker-utils
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/rabbit-ci/worker-utils
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/rabbit-ci/worker-utils" "work/ex/beta-1.38-1/sources/1.37.0/gh/rabbit-ci/worker-utils"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/rabbit-ci/worker-utils'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/rabbit-ci/worker-utils" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rabbit-ci/worker-utils"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rabbit-ci/worker-utils'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c11c1f7782d209af0ab234455ec597b35b225c32
[INFO] sha for GitHub repo rabbit-ci/worker-utils: c11c1f7782d209af0ab234455ec597b35b225c32
[INFO] validating manifest of rabbit-ci/worker-utils on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of rabbit-ci/worker-utils on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing rabbit-ci/worker-utils
[INFO] finished frobbing rabbit-ci/worker-utils
[INFO] frobbed toml for rabbit-ci/worker-utils written to work/ex/beta-1.38-1/sources/1.37.0/gh/rabbit-ci/worker-utils/Cargo.toml
[INFO] started frobbing rabbit-ci/worker-utils
[INFO] finished frobbing rabbit-ci/worker-utils
[INFO] frobbed toml for rabbit-ci/worker-utils written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/rabbit-ci/worker-utils/Cargo.toml
[INFO] crate rabbit-ci/worker-utils already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/rabbit-ci/worker-utils/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing rabbit-ci/worker-utils against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/rabbit-ci/worker-utils:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] b16d995d738704b07a07a6ed7388ea1737a4195a8f596de3009ffea6fde19a4d
[INFO] running `"docker" "start" "-a" "b16d995d738704b07a07a6ed7388ea1737a4195a8f596de3009ffea6fde19a4d"`
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling want v0.2.0
[INFO] [stderr]    Compiling mio v0.6.19
[INFO] [stderr]    Compiling tokio-io v0.1.12
[INFO] [stderr]    Compiling tokio-threadpool v0.1.15
[INFO] [stderr] error[E0554]: #![feature] may not be used on the stable release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-0.2.11/src/lib.rs:522:34
[INFO] [stderr]     |
[INFO] [stderr] 522 | #![cfg_attr(feature = "pattern", feature(pattern))]
[INFO] [stderr]     |                                  ^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]    Compiling h2 v0.1.26
[INFO] [stderr]    Compiling tokio-reactor v0.1.9
[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 `regex`.
[INFO] [stderr] warning: build failed, waiting for other jobs to finish...
[INFO] [stderr] error: build failed
[INFO] running `"docker" "inspect" "b16d995d738704b07a07a6ed7388ea1737a4195a8f596de3009ffea6fde19a4d"`
[INFO] running `"docker" "rm" "-f" "b16d995d738704b07a07a6ed7388ea1737a4195a8f596de3009ffea6fde19a4d"`
[INFO] [stdout] b16d995d738704b07a07a6ed7388ea1737a4195a8f596de3009ffea6fde19a4d