Dec 18 02:59:25.978 INFO checking brinchj/rust-sudoku-fun against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 18 02:59:25.978 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-5/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/brinchj/rust-sudoku-fun:/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 02:59:26.466 INFO [stdout] d1096ec7c5ed6b98a8093a674f5f7772a69a4b3b4ec293771f79ed187d67b5c3
Dec 18 02:59:26.468 INFO running `"docker" "start" "-a" "d1096ec7c5ed6b98a8093a674f5f7772a69a4b3b4ec293771f79ed187d67b5c3"`
Dec 18 02:59:29.034 INFO [stderr]    Compiling im v10.2.0
Dec 18 02:59:29.034 INFO [stderr]     Checking backtrace v0.1.8
Dec 18 02:59:29.958 INFO [stderr]     Checking debugtrace v0.1.0
Dec 18 02:59:30.842 INFO [stderr]     Checking chomp v0.3.1
Dec 18 02:59:33.884 INFO [stderr]     Checking sudokusolver v0.1.0 (/opt/crater/workdir)
Dec 18 02:59:34.768 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:34.768 INFO [stderr]  --> src/lib.rs:3:1
Dec 18 02:59:34.768 INFO [stderr]   |
Dec 18 02:59:34.768 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:34.768 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:34.768 INFO [stderr]   |
Dec 18 02:59:34.768 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:34.768 INFO [stderr] 
Dec 18 02:59:34.812 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:34.812 INFO [stderr]  --> src/lib.rs:3:1
Dec 18 02:59:34.812 INFO [stderr]   |
Dec 18 02:59:34.812 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:34.812 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:34.812 INFO [stderr]   |
Dec 18 02:59:34.812 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:34.812 INFO [stderr] 
Dec 18 02:59:35.104 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 02:59:35.104 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 02:59:35.104 INFO [stderr]   |
Dec 18 02:59:35.104 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:35.104 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:35.104 INFO [stderr]   |
Dec 18 02:59:35.104 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:35.104 INFO [stderr] 
Dec 18 02:59:35.232 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 02:59:35.232 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 02:59:35.232 INFO [stderr]   |
Dec 18 02:59:35.232 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:35.232 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:35.232 INFO [stderr]   |
Dec 18 02:59:35.232 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:35.232 INFO [stderr] 
Dec 18 02:59:36.076 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:36.076 INFO [stderr]  --> src/main.rs:3:1
Dec 18 02:59:36.076 INFO [stderr]   |
Dec 18 02:59:36.076 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:36.076 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:36.076 INFO [stderr]   |
Dec 18 02:59:36.080 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:36.080 INFO [stderr] 
Dec 18 02:59:36.152 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:36.152 INFO [stderr]  --> src/main.rs:3:1
Dec 18 02:59:36.152 INFO [stderr]   |
Dec 18 02:59:36.152 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:36.152 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:36.152 INFO [stderr]   |
Dec 18 02:59:36.152 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:36.152 INFO [stderr] 
Dec 18 02:59:36.389 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 02:59:36.390 INFO [stderr]  --> src/main.rs:1:12
Dec 18 02:59:36.390 INFO [stderr]   |
Dec 18 02:59:36.390 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:36.390 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:36.396 INFO [stderr]   |
Dec 18 02:59:36.396 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:36.396 INFO [stderr] 
Dec 18 02:59:36.440 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 02:59:36.441 INFO [stderr]  --> src/main.rs:1:12
Dec 18 02:59:36.441 INFO [stderr]   |
Dec 18 02:59:36.441 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:36.441 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:36.442 INFO [stderr]   |
Dec 18 02:59:36.442 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:36.442 INFO [stderr] 
Dec 18 02:59:36.531 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.61s
Dec 18 02:59:37.842 INFO running `"docker" "inspect" "d1096ec7c5ed6b98a8093a674f5f7772a69a4b3b4ec293771f79ed187d67b5c3"`
Dec 18 02:59:38.064 INFO running `"docker" "rm" "-f" "d1096ec7c5ed6b98a8093a674f5f7772a69a4b3b4ec293771f79ed187d67b5c3"`
Dec 18 02:59:38.364 INFO [stdout] d1096ec7c5ed6b98a8093a674f5f7772a69a4b3b4ec293771f79ed187d67b5c3