Dec 19 21:09:59.770 INFO checking aacunningham/sudoku_ai_rust against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 21:09:59.770 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/aacunningham/sudoku_ai_rust:/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 21:09:59.940 INFO [stdout] 4bf383913149d6942bcfe1eb12ce185cda8e952510f25aa05520ddb5d1ffe6b1
Dec 19 21:09:59.946 INFO running `"docker" "start" "-a" "4bf383913149d6942bcfe1eb12ce185cda8e952510f25aa05520ddb5d1ffe6b1"`
Dec 19 21:10:00.748 INFO [stderr]     Checking sudoku_ai v0.1.0 (/opt/crater/workdir)
Dec 19 21:10:01.268 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 21:10:01.268 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 21:10:01.268 INFO [stderr]   |
Dec 19 21:10:01.268 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 21:10:01.268 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 21:10:01.268 INFO [stderr]   |
Dec 19 21:10:01.276 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 21:10:01.276 INFO [stderr] 
Dec 19 21:10:01.645 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 19 21:10:01.645 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 21:10:01.645 INFO [stderr]   |
Dec 19 21:10:01.645 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 21:10:01.645 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 21:10:01.645 INFO [stderr]   |
Dec 19 21:10:01.645 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 21:10:01.645 INFO [stderr] 
Dec 19 21:10:01.740 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.00s
Dec 19 21:10:02.209 INFO running `"docker" "inspect" "4bf383913149d6942bcfe1eb12ce185cda8e952510f25aa05520ddb5d1ffe6b1"`
Dec 19 21:10:02.295 INFO running `"docker" "rm" "-f" "4bf383913149d6942bcfe1eb12ce185cda8e952510f25aa05520ddb5d1ffe6b1"`
Dec 19 21:10:02.447 INFO [stdout] 4bf383913149d6942bcfe1eb12ce185cda8e952510f25aa05520ddb5d1ffe6b1