Dec 19 14:01:29.981 INFO checking krixon/knights-tour-rs against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 14:01:29.981 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/krixon/knights-tour-rs:/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=forbid" "-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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 14:01:30.435 INFO [stdout] 15f1f571f7bd2cc8bbfd6a99483e588128f5588973838df7a105b717f298b9e5
Dec 19 14:01:30.439 INFO running `"docker" "start" "-a" "15f1f571f7bd2cc8bbfd6a99483e588128f5588973838df7a105b717f298b9e5"`
Dec 19 14:01:32.553 INFO [stderr]     Checking rand v0.3.14
Dec 19 14:01:33.832 INFO [stderr]     Checking knights_tour v0.1.0 (/opt/crater/workdir)
Dec 19 14:01:34.421 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.91s
Dec 19 14:01:35.596 INFO running `"docker" "inspect" "15f1f571f7bd2cc8bbfd6a99483e588128f5588973838df7a105b717f298b9e5"`
Dec 19 14:01:35.864 INFO running `"docker" "rm" "-f" "15f1f571f7bd2cc8bbfd6a99483e588128f5588973838df7a105b717f298b9e5"`
Dec 19 14:01:36.252 INFO [stdout] 15f1f571f7bd2cc8bbfd6a99483e588128f5588973838df7a105b717f298b9e5