Dec 18 12:48:27.313 INFO checking prophet-0.4.2 against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 12:48:27.313 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/reg/prophet/0.4.2:/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 12:48:27.816 INFO [stdout] 74b6b7322c8d81838f445b37c90010b096f8a162689180a12a65fd28cbfa79bc
Dec 18 12:48:27.818 INFO running `"docker" "start" "-a" "74b6b7322c8d81838f445b37c90010b096f8a162689180a12a65fd28cbfa79bc"`
Dec 18 12:48:30.573 INFO [stderr]    Compiling ndarray v0.10.14
Dec 18 12:48:38.678 INFO [stderr]     Checking ndarray-rand v0.6.1
Dec 18 12:48:39.210 INFO [stderr]     Checking prophet v0.4.2 (/opt/crater/workdir)
Dec 18 12:48:42.048 INFO [stderr] warning: unused return value of `std::borrow::ToOwned::to_owned` that must be used
Dec 18 12:48:42.048 INFO [stderr]    --> src/neural_net.rs:418:4
Dec 18 12:48:42.048 INFO [stderr]     |
Dec 18 12:48:42.048 INFO [stderr] 418 |             layer.calculate_output_gradients(expected.view()).to_owned();
Dec 18 12:48:42.048 INFO [stderr]     |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 12:48:42.048 INFO [stderr]     |
Dec 18 12:48:42.048 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 18 12:48:42.048 INFO [stderr]     = note: cloning is often expensive and is not expected to have side effects
Dec 18 12:48:42.048 INFO [stderr] 
Dec 18 12:48:42.856 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 12.40s
Dec 18 12:48:43.510 INFO running `"docker" "inspect" "74b6b7322c8d81838f445b37c90010b096f8a162689180a12a65fd28cbfa79bc"`
Dec 18 12:48:43.808 INFO running `"docker" "rm" "-f" "74b6b7322c8d81838f445b37c90010b096f8a162689180a12a65fd28cbfa79bc"`
Dec 18 12:48:44.240 INFO [stdout] 74b6b7322c8d81838f445b37c90010b096f8a162689180a12a65fd28cbfa79bc