Dec 04 12:24:21.131 INFO checking pierrechevalier83/2048-rs against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 04 12:24:21.131 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-6/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +1df97983eb2057dc6a8f7eb364e263b51ae23230-alt check --frozen --all --all-targets" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 04 12:24:21.477 INFO [stdout] 053c24057091a6327651a42e205340f8ab45f468b2d9980404e79352294e53c6
Dec 04 12:24:21.481 INFO running `"docker" "start" "-a" "053c24057091a6327651a42e205340f8ab45f468b2d9980404e79352294e53c6"`
Dec 04 12:24:22.131 INFO [stderr] usermod: no changes
Dec 04 12:24:22.235 INFO [stderr]     Checking termion v1.2.0
Dec 04 12:24:22.235 INFO [stderr]     Checking matrix_display v0.3.0
Dec 04 12:24:22.235 INFO [stderr]     Checking num-bigint v0.1.36
Dec 04 12:24:23.319 INFO [stderr]     Checking num-rational v0.1.36
Dec 04 12:24:23.837 INFO [stderr]     Checking num v0.1.37
Dec 04 12:24:24.072 INFO [stderr]     Checking game-2048 v0.5.1 (/source)
Dec 04 12:24:24.640 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 04 12:24:24.641 INFO [stderr]   --> src/game.rs:69:9
Dec 04 12:24:24.641 INFO [stderr]    |
Dec 04 12:24:24.641 INFO [stderr] 69 | /         self.data
Dec 04 12:24:24.641 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 04 12:24:24.641 INFO [stderr] 71 | |             .map(|row| {
Dec 04 12:24:24.641 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 04 12:24:24.641 INFO [stderr] ...  |
Dec 04 12:24:24.641 INFO [stderr] 87 | |             })
Dec 04 12:24:24.641 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 04 12:24:24.641 INFO [stderr]    | |_________________________________^
Dec 04 12:24:24.642 INFO [stderr]    |
Dec 04 12:24:24.642 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 04 12:24:24.642 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 04 12:24:24.642 INFO [stderr] 
Dec 04 12:24:24.694 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 04 12:24:24.694 INFO [stderr]   --> src/game.rs:69:9
Dec 04 12:24:24.694 INFO [stderr]    |
Dec 04 12:24:24.694 INFO [stderr] 69 | /         self.data
Dec 04 12:24:24.694 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 04 12:24:24.694 INFO [stderr] 71 | |             .map(|row| {
Dec 04 12:24:24.694 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 04 12:24:24.694 INFO [stderr] ...  |
Dec 04 12:24:24.694 INFO [stderr] 87 | |             })
Dec 04 12:24:24.694 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 04 12:24:24.694 INFO [stderr]    | |_________________________________^
Dec 04 12:24:24.694 INFO [stderr]    |
Dec 04 12:24:24.694 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 04 12:24:24.694 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 04 12:24:24.694 INFO [stderr] 
Dec 04 12:24:24.709 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.55s
Dec 04 12:24:24.716 INFO [stderr] su: No module specific data is present
Dec 04 12:24:25.075 INFO running `"docker" "inspect" "053c24057091a6327651a42e205340f8ab45f468b2d9980404e79352294e53c6"`
Dec 04 12:24:25.329 INFO running `"docker" "rm" "-f" "053c24057091a6327651a42e205340f8ab45f468b2d9980404e79352294e53c6"`
Dec 04 12:24:25.586 INFO [stdout] 053c24057091a6327651a42e205340f8ab45f468b2d9980404e79352294e53c6