Dec 17 15:12:13.525 INFO checking slavovojacek/8QP_rust against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 15:12:13.525 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/slavovojacek/8QP_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 17 15:12:13.985 INFO [stdout] 9772f6cfef5b78325f82aac552dd4dc019d7671cab4e6b68a91e13ba9dc24d4c
Dec 17 15:12:13.988 INFO running `"docker" "start" "-a" "9772f6cfef5b78325f82aac552dd4dc019d7671cab4e6b68a91e13ba9dc24d4c"`
Dec 17 15:12:15.556 INFO [stderr]     Checking eight_queen_problem v0.1.0 (/opt/crater/workdir)
Dec 17 15:12:16.052 INFO [stderr] warning: value assigned to `empty_squares` is never read
Dec 17 15:12:16.052 INFO [stderr]   --> src/main.rs:20:13
Dec 17 15:12:16.052 INFO [stderr]    |
Dec 17 15:12:16.052 INFO [stderr] 20 |     let mut empty_squares: Vec<Position> = Vec::new();
Dec 17 15:12:16.052 INFO [stderr]    |             ^^^^^^^^^^^^^
Dec 17 15:12:16.052 INFO [stderr]    |
Dec 17 15:12:16.052 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 17 15:12:16.052 INFO [stderr] 
Dec 17 15:12:16.052 INFO [stderr] warning: unused variable: `r`
Dec 17 15:12:16.052 INFO [stderr]    --> src/main.rs:113:33
Dec 17 15:12:16.052 INFO [stderr]     |
Dec 17 15:12:16.052 INFO [stderr] 113 | fn fill_col(board: &mut Board, (r, c): Position) -> Result<(), Position> {
Dec 17 15:12:16.052 INFO [stderr]     |                                 ^ help: consider using `_r` instead
Dec 17 15:12:16.052 INFO [stderr]     |
Dec 17 15:12:16.052 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 17 15:12:16.052 INFO [stderr] 
Dec 17 15:12:16.088 INFO [stderr] warning: value assigned to `empty_squares` is never read
Dec 17 15:12:16.088 INFO [stderr]   --> src/main.rs:20:13
Dec 17 15:12:16.088 INFO [stderr]    |
Dec 17 15:12:16.088 INFO [stderr] 20 |     let mut empty_squares: Vec<Position> = Vec::new();
Dec 17 15:12:16.088 INFO [stderr]    |             ^^^^^^^^^^^^^
Dec 17 15:12:16.088 INFO [stderr]    |
Dec 17 15:12:16.088 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 17 15:12:16.088 INFO [stderr] 
Dec 17 15:12:16.088 INFO [stderr] warning: unused variable: `r`
Dec 17 15:12:16.088 INFO [stderr]    --> src/main.rs:113:33
Dec 17 15:12:16.088 INFO [stderr]     |
Dec 17 15:12:16.088 INFO [stderr] 113 | fn fill_col(board: &mut Board, (r, c): Position) -> Result<(), Position> {
Dec 17 15:12:16.088 INFO [stderr]     |                                 ^ help: consider using `_r` instead
Dec 17 15:12:16.088 INFO [stderr]     |
Dec 17 15:12:16.088 INFO [stderr]     = note: #[warn(unused_variables)] on by default
Dec 17 15:12:16.088 INFO [stderr] 
Dec 17 15:12:16.153 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.65s
Dec 17 15:12:16.757 INFO running `"docker" "inspect" "9772f6cfef5b78325f82aac552dd4dc019d7671cab4e6b68a91e13ba9dc24d4c"`
Dec 17 15:12:17.104 INFO running `"docker" "rm" "-f" "9772f6cfef5b78325f82aac552dd4dc019d7671cab4e6b68a91e13ba9dc24d4c"`
Dec 17 15:12:17.399 INFO [stdout] 9772f6cfef5b78325f82aac552dd4dc019d7671cab4e6b68a91e13ba9dc24d4c