[INFO] cloning repository dgrisham/codesignal
[INFO] running `"git" "clone" "--bare" "git://github.com/dgrisham/codesignal.git" "work/cache/sources/gh/dgrisham/codesignal"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/dgrisham/codesignal'...
[INFO] running `"git" "clone" "work/cache/sources/gh/dgrisham/codesignal" "work/ex/beta-1.37-6/sources/1.36.0/gh/dgrisham/codesignal"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/dgrisham/codesignal'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/dgrisham/codesignal" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dgrisham/codesignal"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dgrisham/codesignal'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3f8e37c31526e06cc724805911f571c5fca59e3e
[INFO] sha for GitHub repo dgrisham/codesignal: 3f8e37c31526e06cc724805911f571c5fca59e3e
[INFO] validating manifest of dgrisham/codesignal 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 dgrisham/codesignal 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 dgrisham/codesignal
[INFO] finished frobbing dgrisham/codesignal
[INFO] frobbed toml for dgrisham/codesignal written to work/ex/beta-1.37-6/sources/1.36.0/gh/dgrisham/codesignal/Cargo.toml
[INFO] started frobbing dgrisham/codesignal
[INFO] finished frobbing dgrisham/codesignal
[INFO] frobbed toml for dgrisham/codesignal written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dgrisham/codesignal/Cargo.toml
[INFO] crate dgrisham/codesignal 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] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing dgrisham/codesignal against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/dgrisham/codesignal:/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-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 731161da2bcb2577dd455e9fe7c385dd6bc740f483c736038b941987cb183fcf
[INFO] running `"docker" "start" "-a" "731161da2bcb2577dd455e9fe7c385dd6bc740f483c736038b941987cb183fcf"`
[INFO] [stderr]    Compiling codesignal v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no method named `is_even` found for type `i32` in the current scope
[INFO] [stderr]   --> src/reverse_in_parentheses.rs:25:32
[INFO] [stderr]    |
[INFO] [stderr] 25 |         } else if parens_level.is_even() {
[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 E0599`.
[INFO] [stderr] error: Could not compile `codesignal`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "731161da2bcb2577dd455e9fe7c385dd6bc740f483c736038b941987cb183fcf"`
[INFO] running `"docker" "rm" "-f" "731161da2bcb2577dd455e9fe7c385dd6bc740f483c736038b941987cb183fcf"`
[INFO] [stdout] 731161da2bcb2577dd455e9fe7c385dd6bc740f483c736038b941987cb183fcf