[INFO] updating cached repository Dylan-DPC/cargo-stabilize
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Dylan-DPC/cargo-stabilize
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Dylan-DPC/cargo-stabilize" "work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-stabilize"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-stabilize'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Dylan-DPC/cargo-stabilize" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-stabilize"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-stabilize'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 4bcdddcb406528ed628367042723908049d01260
[INFO] sha for GitHub repo Dylan-DPC/cargo-stabilize: 4bcdddcb406528ed628367042723908049d01260
[INFO] validating manifest of Dylan-DPC/cargo-stabilize 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 Dylan-DPC/cargo-stabilize 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 Dylan-DPC/cargo-stabilize
[INFO] finished frobbing Dylan-DPC/cargo-stabilize
[INFO] frobbed toml for Dylan-DPC/cargo-stabilize written to work/ex/beta-1.38-1/sources/1.37.0/gh/Dylan-DPC/cargo-stabilize/Cargo.toml
[INFO] started frobbing Dylan-DPC/cargo-stabilize
[INFO] finished frobbing Dylan-DPC/cargo-stabilize
[INFO] frobbed toml for Dylan-DPC/cargo-stabilize written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-stabilize/Cargo.toml
[INFO] crate Dylan-DPC/cargo-stabilize 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing Dylan-DPC/cargo-stabilize against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/Dylan-DPC/cargo-stabilize:/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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] ac543aa58b4be10f78a1def9bbb3623c0256d79136f2c9ecdf11ce5e37a9697e
[INFO] running `"docker" "start" "-a" "ac543aa58b4be10f78a1def9bbb3623c0256d79136f2c9ecdf11ce5e37a9697e"`
[INFO] [stderr]    Compiling unicode-segmentation v1.2.1
[INFO] [stderr]    Compiling regex v1.1.0
[INFO] [stderr]    Compiling memchr v2.1.2
[INFO] [stderr]    Compiling atty v0.2.11
[INFO] [stderr]    Compiling syn v0.15.23
[INFO] [stderr]    Compiling clap v2.32.0
[INFO] [stderr]    Compiling heck v0.3.1
[INFO] [stderr]    Compiling aho-corasick v0.6.9
[INFO] [stderr] error[E0554]: `#![feature]` may not be used on the beta release channel
[INFO] [stderr]    --> /opt/crater/cargo-home/registry/src/github.com-1ecc6299db9ec823/regex-1.1.0/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" "ac543aa58b4be10f78a1def9bbb3623c0256d79136f2c9ecdf11ce5e37a9697e"`
[INFO] running `"docker" "rm" "-f" "ac543aa58b4be10f78a1def9bbb3623c0256d79136f2c9ecdf11ce5e37a9697e"`
[INFO] [stdout] ac543aa58b4be10f78a1def9bbb3623c0256d79136f2c9ecdf11ce5e37a9697e