Dec 18 04:41:38.713 INFO checking aacunningham/sudoku_ai_rust against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 04:41:38.713 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-3/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 04:41:39.106 INFO [stdout] e4e5d4ccfac0952d3e2f45e357a852042dc6a46aaff8c3241a0e89d15296be1d
Dec 18 04:41:39.108 INFO running `"docker" "start" "-a" "e4e5d4ccfac0952d3e2f45e357a852042dc6a46aaff8c3241a0e89d15296be1d"`
Dec 18 04:41:40.296 INFO [stderr]     Checking sudoku_ai v0.1.0 (/opt/crater/workdir)
Dec 18 04:41:40.800 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 18 04:41:40.800 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 04:41:40.800 INFO [stderr]   |
Dec 18 04:41:40.800 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 04:41:40.800 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 04:41:40.800 INFO [stderr]   |
Dec 18 04:41:40.800 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 04:41:40.800 INFO [stderr] 
Dec 18 04:41:40.882 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 18 04:41:40.882 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 04:41:40.882 INFO [stderr]   |
Dec 18 04:41:40.882 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 04:41:40.882 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 04:41:40.882 INFO [stderr]   |
Dec 18 04:41:40.882 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 04:41:40.882 INFO [stderr] 
Dec 18 04:41:41.336 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.08s
Dec 18 04:41:41.862 INFO running `"docker" "inspect" "e4e5d4ccfac0952d3e2f45e357a852042dc6a46aaff8c3241a0e89d15296be1d"`
Dec 18 04:41:42.086 INFO running `"docker" "rm" "-f" "e4e5d4ccfac0952d3e2f45e357a852042dc6a46aaff8c3241a0e89d15296be1d"`
Dec 18 04:41:42.321 INFO [stdout] e4e5d4ccfac0952d3e2f45e357a852042dc6a46aaff8c3241a0e89d15296be1d