[INFO] updating cached repository kinokasai/genetic
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kinokasai/genetic
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kinokasai/genetic" "work/ex/beta-1.38-1/sources/1.37.0/gh/kinokasai/genetic"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kinokasai/genetic'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kinokasai/genetic" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kinokasai/genetic"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kinokasai/genetic'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3c412e50fbba5e7573d7aea8e0fc591ffde3f7df
[INFO] sha for GitHub repo kinokasai/genetic: 3c412e50fbba5e7573d7aea8e0fc591ffde3f7df
[INFO] validating manifest of kinokasai/genetic 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 kinokasai/genetic 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 kinokasai/genetic
[INFO] finished frobbing kinokasai/genetic
[INFO] frobbed toml for kinokasai/genetic written to work/ex/beta-1.38-1/sources/1.37.0/gh/kinokasai/genetic/Cargo.toml
[INFO] started frobbing kinokasai/genetic
[INFO] finished frobbing kinokasai/genetic
[INFO] frobbed toml for kinokasai/genetic written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kinokasai/genetic/Cargo.toml
[INFO] crate kinokasai/genetic 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/kinokasai/genetic/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[INFO] the lockfile is outdated, regenerating it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 kinokasai/genetic 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-0/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/kinokasai/genetic:/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] 7bb9e0951c5ca447053da0a1d64f35f6d44d64298a77f45f2db7edd79e3e73a1
[INFO] running `"docker" "start" "-a" "7bb9e0951c5ca447053da0a1d64f35f6d44d64298a77f45f2db7edd79e3e73a1"`
[INFO] [stderr]    Compiling deque v0.3.2
[INFO] [stderr]    Compiling rayon v0.4.3
[INFO] [stderr]    Compiling gen v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] error[E0599]: no method named `choose` found for type `rand::prelude::ThreadRng` in the current scope
[INFO] [stderr]   --> src/main.rs:63:28
[INFO] [stderr]    |
[INFO] [stderr] 63 |         rand::thread_rng().choose(pop)
[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 `gen`.
[INFO] [stderr] 
[INFO] [stderr] To learn more, run the command again with --verbose.
[INFO] running `"docker" "inspect" "7bb9e0951c5ca447053da0a1d64f35f6d44d64298a77f45f2db7edd79e3e73a1"`
[INFO] running `"docker" "rm" "-f" "7bb9e0951c5ca447053da0a1d64f35f6d44d64298a77f45f2db7edd79e3e73a1"`
[INFO] [stdout] 7bb9e0951c5ca447053da0a1d64f35f6d44d64298a77f45f2db7edd79e3e73a1