Dec 19 16:01:46.188 INFO checking howeih/Day-17-Perceptron against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 16:01:46.188 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-6/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/howeih/Day-17-Perceptron:/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 16:01:46.388 INFO [stdout] 18cf3bc22691426e3d8ed30473f30b90b00813358c2abbd7f93f13ace85eb492
Dec 19 16:01:46.390 INFO running `"docker" "start" "-a" "18cf3bc22691426e3d8ed30473f30b90b00813358c2abbd7f93f13ace85eb492"`
Dec 19 16:01:47.104 INFO [stderr]    Compiling ndarray v0.11.2
Dec 19 16:01:47.108 INFO [stderr]     Checking itertools v0.7.8
Dec 19 16:01:47.116 INFO [stderr]     Checking num-complex v0.1.43
Dec 19 16:01:55.278 INFO [stderr]     Checking perceptron v0.1.0 (/opt/crater/workdir)
Dec 19 16:01:55.525 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.45s
Dec 19 16:01:55.787 INFO running `"docker" "inspect" "18cf3bc22691426e3d8ed30473f30b90b00813358c2abbd7f93f13ace85eb492"`
Dec 19 16:01:55.875 INFO running `"docker" "rm" "-f" "18cf3bc22691426e3d8ed30473f30b90b00813358c2abbd7f93f13ace85eb492"`
Dec 19 16:01:55.964 INFO [stdout] 18cf3bc22691426e3d8ed30473f30b90b00813358c2abbd7f93f13ace85eb492