Dec 19 16:01:15.729 INFO checking howeih/Day-44-Gradient-Approximation against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 16:01:15.729 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/howeih/Day-44-Gradient-Approximation:/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 16:01:15.990 INFO [stdout] f8d45343c89ee45340d7b9c7d09c3d024a8685891a0318d2089015e645f71178
Dec 19 16:01:15.993 INFO running `"docker" "start" "-a" "f8d45343c89ee45340d7b9c7d09c3d024a8685891a0318d2089015e645f71178"`
Dec 19 16:01:16.626 INFO [stderr]    Compiling ndarray v0.11.2
Dec 19 16:01:16.626 INFO [stderr]     Checking itertools v0.7.8
Dec 19 16:01:25.029 INFO [stderr]     Checking gradient_approximation v0.1.0 (/opt/crater/workdir)
Dec 19 16:01:25.370 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.77s
Dec 19 16:01:25.590 INFO running `"docker" "inspect" "f8d45343c89ee45340d7b9c7d09c3d024a8685891a0318d2089015e645f71178"`
Dec 19 16:01:25.675 INFO running `"docker" "rm" "-f" "f8d45343c89ee45340d7b9c7d09c3d024a8685891a0318d2089015e645f71178"`
Dec 19 16:01:25.786 INFO [stdout] f8d45343c89ee45340d7b9c7d09c3d024a8685891a0318d2089015e645f71178