Dec 19 19:33:37.876 INFO checking brinchj/rust-sudoku-fun against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 19:33:37.876 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-3/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/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" "+e70472fc501b855c9080f3772432c10fe20b8866-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 19:33:38.334 INFO [stdout] 5315cbc82fa274cb574e6d4ed027ac55eaec1e46f9609ac12b9700e1170a59a8
Dec 19 19:33:38.338 INFO running `"docker" "start" "-a" "5315cbc82fa274cb574e6d4ed027ac55eaec1e46f9609ac12b9700e1170a59a8"`
Dec 19 19:33:39.828 INFO [stderr]     Checking debug-builders v0.1.0
Dec 19 19:33:39.828 INFO [stderr]    Compiling debugtrace v0.1.0
Dec 19 19:33:39.828 INFO [stderr]     Checking either v0.1.7
Dec 19 19:33:39.833 INFO [stderr]     Checking conv v0.3.3
Dec 19 19:33:40.778 INFO [stderr]     Checking backtrace v0.1.8
Dec 19 19:33:42.260 INFO [stderr]     Checking chomp v0.3.1
Dec 19 19:33:43.651 INFO [stderr]     Checking sudokusolver v0.1.0 (/opt/crater/workdir)
Dec 19 19:33:44.487 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 19:33:44.488 INFO [stderr]  --> src/lib.rs:3:1
Dec 19 19:33:44.488 INFO [stderr]   |
Dec 19 19:33:44.488 INFO [stderr] 3 | #[macro_use]
Dec 19 19:33:44.488 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 19:33:44.488 INFO [stderr]   |
Dec 19 19:33:44.488 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 19:33:44.488 INFO [stderr] 
Dec 19 19:33:44.512 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 19:33:44.512 INFO [stderr]  --> src/lib.rs:3:1
Dec 19 19:33:44.512 INFO [stderr]   |
Dec 19 19:33:44.512 INFO [stderr] 3 | #[macro_use]
Dec 19 19:33:44.512 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 19:33:44.512 INFO [stderr]   |
Dec 19 19:33:44.512 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 19:33:44.512 INFO [stderr] 
Dec 19 19:33:44.804 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 19:33:44.805 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 19:33:44.805 INFO [stderr]   |
Dec 19 19:33:44.805 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 19:33:44.805 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 19:33:44.806 INFO [stderr]   |
Dec 19 19:33:44.806 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 19:33:44.806 INFO [stderr] 
Dec 19 19:33:44.813 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 19:33:44.813 INFO [stderr]  --> src/lib.rs:1:12
Dec 19 19:33:44.814 INFO [stderr]   |
Dec 19 19:33:44.814 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 19:33:44.814 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 19:33:44.814 INFO [stderr]   |
Dec 19 19:33:44.815 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 19:33:44.815 INFO [stderr] 
Dec 19 19:33:45.600 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 19:33:45.600 INFO [stderr]  --> src/main.rs:3:1
Dec 19 19:33:45.600 INFO [stderr]   |
Dec 19 19:33:45.600 INFO [stderr] 3 | #[macro_use]
Dec 19 19:33:45.600 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 19:33:45.601 INFO [stderr]   |
Dec 19 19:33:45.601 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 19:33:45.601 INFO [stderr] 
Dec 19 19:33:45.608 INFO [stderr] warning: unused `#[macro_use]` import
Dec 19 19:33:45.608 INFO [stderr]  --> src/main.rs:3:1
Dec 19 19:33:45.608 INFO [stderr]   |
Dec 19 19:33:45.608 INFO [stderr] 3 | #[macro_use]
Dec 19 19:33:45.608 INFO [stderr]   | ^^^^^^^^^^^^
Dec 19 19:33:45.608 INFO [stderr]   |
Dec 19 19:33:45.608 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 19:33:45.608 INFO [stderr] 
Dec 19 19:33:45.904 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 19:33:45.904 INFO [stderr]  --> src/main.rs:1:12
Dec 19 19:33:45.904 INFO [stderr]   |
Dec 19 19:33:45.904 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 19:33:45.904 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 19:33:45.904 INFO [stderr]   |
Dec 19 19:33:45.904 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 19:33:45.904 INFO [stderr] 
Dec 19 19:33:45.948 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 19:33:45.948 INFO [stderr]  --> src/main.rs:1:12
Dec 19 19:33:45.948 INFO [stderr]   |
Dec 19 19:33:45.948 INFO [stderr] 1 | #![feature(iterator_step_by)]
Dec 19 19:33:45.948 INFO [stderr]   |            ^^^^^^^^^^^^^^^^
Dec 19 19:33:45.948 INFO [stderr]   |
Dec 19 19:33:45.948 INFO [stderr]   = note: #[warn(stable_features)] on by default
Dec 19 19:33:45.948 INFO [stderr] 
Dec 19 19:33:46.013 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.31s
Dec 19 19:33:47.309 INFO running `"docker" "inspect" "5315cbc82fa274cb574e6d4ed027ac55eaec1e46f9609ac12b9700e1170a59a8"`
Dec 19 19:33:47.658 INFO running `"docker" "rm" "-f" "5315cbc82fa274cb574e6d4ed027ac55eaec1e46f9609ac12b9700e1170a59a8"`
Dec 19 19:33:47.918 INFO [stdout] 5315cbc82fa274cb574e6d4ed027ac55eaec1e46f9609ac12b9700e1170a59a8