Dec 18 02:59:25.069 INFO checking brinchj/rust-sudoku-fun against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 02:59:25.069 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-7/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 18 02:59:25.576 INFO [stdout] 3860316652eaf05aaee87ceaf68b6bc0e9a086cb8e04a82a28a6a58061de8703
Dec 18 02:59:25.576 INFO running `"docker" "start" "-a" "3860316652eaf05aaee87ceaf68b6bc0e9a086cb8e04a82a28a6a58061de8703"`
Dec 18 02:59:27.542 INFO [stderr]    Compiling debugtrace v0.1.0
Dec 18 02:59:27.542 INFO [stderr]     Checking debug-builders v0.1.0
Dec 18 02:59:27.542 INFO [stderr]     Checking either v0.1.7
Dec 18 02:59:27.560 INFO [stderr]     Checking conv v0.3.3
Dec 18 02:59:28.814 INFO [stderr]     Checking backtrace v0.1.8
Dec 18 02:59:30.716 INFO [stderr]     Checking chomp v0.3.1
Dec 18 02:59:32.171 INFO [stderr]     Checking sudokusolver v0.1.0 (/opt/crater/workdir)
Dec 18 02:59:32.985 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:32.985 INFO [stderr]  --> src/lib.rs:3:1
Dec 18 02:59:32.986 INFO [stderr]   |
Dec 18 02:59:32.986 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:32.986 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:32.987 INFO [stderr]   |
Dec 18 02:59:32.987 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:32.987 INFO [stderr] 
Dec 18 02:59:33.016 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:33.016 INFO [stderr]  --> src/lib.rs:3:1
Dec 18 02:59:33.016 INFO [stderr]   |
Dec 18 02:59:33.016 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:33.016 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:33.016 INFO [stderr]   |
Dec 18 02:59:33.016 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:33.016 INFO [stderr] 
Dec 18 02:59:33.268 INFO [stderr] warning: the feature `iterator_step_by` has been stable since 1.28.0 and no longer requires an attribute to enable
Dec 18 02:59:33.269 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 02:59:33.269 INFO [stderr]   |
Dec 18 02:59:33.269 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:33.269 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:33.270 INFO [stderr]   |
Dec 18 02:59:33.270 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:33.270 INFO [stderr] 
Dec 18 02:59:33.316 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 02:59:33.317 INFO [stderr]  --> src/lib.rs:1:12
Dec 18 02:59:33.317 INFO [stderr]   |
Dec 18 02:59:33.317 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:33.318 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:33.318 INFO [stderr]   |
Dec 18 02:59:33.318 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:33.318 INFO [stderr] 
Dec 18 02:59:33.983 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:33.983 INFO [stderr]  --> src/main.rs:3:1
Dec 18 02:59:33.983 INFO [stderr]   |
Dec 18 02:59:33.983 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:33.983 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:33.983 INFO [stderr]   |
Dec 18 02:59:33.984 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:33.984 INFO [stderr] 
Dec 18 02:59:34.180 INFO [stderr] warning: unused `#[macro_use]` import
Dec 18 02:59:34.180 INFO [stderr]  --> src/main.rs:3:1
Dec 18 02:59:34.180 INFO [stderr]   |
Dec 18 02:59:34.180 INFO [stderr] 3 | #[macro_use]
Dec 18 02:59:34.180 INFO [stderr]   | ^^^^^^^^^^^^
Dec 18 02:59:34.180 INFO [stderr]   |
Dec 18 02:59:34.180 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 18 02:59:34.181 INFO [stderr] 
Dec 18 02:59:34.327 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 02:59:34.327 INFO [stderr]  --> src/main.rs:1:12
Dec 18 02:59:34.327 INFO [stderr]   |
Dec 18 02:59:34.327 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:34.327 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:34.327 INFO [stderr]   |
Dec 18 02:59:34.328 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:34.328 INFO [stderr] 
Dec 18 02:59:34.525 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 02:59:34.525 INFO [stderr]  --> src/main.rs:1:12
Dec 18 02:59:34.525 INFO [stderr]   |
Dec 18 02:59:34.525 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 18 02:59:34.525 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 18 02:59:34.525 INFO [stderr]   |
Dec 18 02:59:34.525 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 18 02:59:34.525 INFO [stderr] 
Dec 18 02:59:34.589 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.17s
Dec 18 02:59:35.978 INFO running `"docker" "inspect" "3860316652eaf05aaee87ceaf68b6bc0e9a086cb8e04a82a28a6a58061de8703"`
Dec 18 02:59:36.350 INFO running `"docker" "rm" "-f" "3860316652eaf05aaee87ceaf68b6bc0e9a086cb8e04a82a28a6a58061de8703"`
Dec 18 02:59:36.640 INFO [stdout] 3860316652eaf05aaee87ceaf68b6bc0e9a086cb8e04a82a28a6a58061de8703