[INFO] updating cached repository Connicpu/markovify
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Connicpu/markovify
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Connicpu/markovify" "work/ex/beta-1.37-6/sources/1.36.0/gh/Connicpu/markovify"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/Connicpu/markovify'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Connicpu/markovify" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Connicpu/markovify"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Connicpu/markovify'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ae45cfdaa115ed2105abb73ac60b7c52488daffd
[INFO] sha for GitHub repo Connicpu/markovify: ae45cfdaa115ed2105abb73ac60b7c52488daffd
[INFO] validating manifest of Connicpu/markovify on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Connicpu/markovify on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Connicpu/markovify
[INFO] finished frobbing Connicpu/markovify
[INFO] frobbed toml for Connicpu/markovify written to work/ex/beta-1.37-6/sources/1.36.0/gh/Connicpu/markovify/Cargo.toml
[INFO] started frobbing Connicpu/markovify
[INFO] finished frobbing Connicpu/markovify
[INFO] frobbed toml for Connicpu/markovify written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/Connicpu/markovify/Cargo.toml
[INFO] crate Connicpu/markovify already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Connicpu/markovify/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[INFO] the lockfile is outdated, regenerating it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" "+1.36.0" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Connicpu/markovify against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-3/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/Connicpu/markovify:/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] d9b51ff661520513bae2204b7c39c412b279d214fa28da2195d4e10490284c2e
[INFO] running `"docker" "start" "-a" "d9b51ff661520513bae2204b7c39c412b279d214fa28da2195d4e10490284c2e"`
[INFO] [stderr]    Compiling regex v0.2.11
[INFO] [stderr]    Compiling c2-chacha v0.2.2
[INFO] [stderr]    Compiling ole32-sys v0.2.0
[INFO] [stderr]    Compiling bincode v1.1.4
[INFO] [stderr]    Compiling getrandom v0.1.7
[INFO] [stderr]    Compiling rand_core v0.5.0
[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] 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" "d9b51ff661520513bae2204b7c39c412b279d214fa28da2195d4e10490284c2e"`
[INFO] running `"docker" "rm" "-f" "d9b51ff661520513bae2204b7c39c412b279d214fa28da2195d4e10490284c2e"`
[INFO] [stdout] d9b51ff661520513bae2204b7c39c412b279d214fa28da2195d4e10490284c2e