Dec 19 10:58:13.485 INFO checking pierrechevalier83/2048-rs against try#e70472fc501b855c9080f3772432c10fe20b8866 for pr-56955
Dec 19 10:58:13.485 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-1/try#e70472fc501b855c9080f3772432c10fe20b8866:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/try#e70472fc501b855c9080f3772432c10fe20b8866/gh/pierrechevalier83/2048-rs:/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 10:58:13.918 INFO [stdout] 874e5157191f30cb67e33e2039def6a0b7ae2a0a23ba926b63004a81ba0c43c7
Dec 19 10:58:13.920 INFO running `"docker" "start" "-a" "874e5157191f30cb67e33e2039def6a0b7ae2a0a23ba926b63004a81ba0c43c7"`
Dec 19 10:58:15.122 INFO [stderr]     Checking termion v1.2.0
Dec 19 10:58:15.122 INFO [stderr]     Checking matrix_display v0.3.0
Dec 19 10:58:15.124 INFO [stderr]     Checking num-bigint v0.1.36
Dec 19 10:58:16.300 INFO [stderr]     Checking num-rational v0.1.36
Dec 19 10:58:16.676 INFO [stderr]     Checking num v0.1.37
Dec 19 10:58:16.823 INFO [stderr]     Checking game-2048 v0.5.1 (/opt/crater/workdir)
Dec 19 10:58:17.152 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 19 10:58:17.152 INFO [stderr]   --> src/game.rs:69:9
Dec 19 10:58:17.152 INFO [stderr]    |
Dec 19 10:58:17.152 INFO [stderr] 69 | /         self.data
Dec 19 10:58:17.152 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 19 10:58:17.152 INFO [stderr] 71 | |             .map(|row| {
Dec 19 10:58:17.152 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 19 10:58:17.152 INFO [stderr] ...  |
Dec 19 10:58:17.152 INFO [stderr] 87 | |             })
Dec 19 10:58:17.152 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 19 10:58:17.152 INFO [stderr]    | |_________________________________^
Dec 19 10:58:17.152 INFO [stderr]    |
Dec 19 10:58:17.152 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 10:58:17.152 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 19 10:58:17.152 INFO [stderr] 
Dec 19 10:58:17.548 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 19 10:58:17.548 INFO [stderr]   --> src/game.rs:69:9
Dec 19 10:58:17.548 INFO [stderr]    |
Dec 19 10:58:17.548 INFO [stderr] 69 | /         self.data
Dec 19 10:58:17.548 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 19 10:58:17.548 INFO [stderr] 71 | |             .map(|row| {
Dec 19 10:58:17.548 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 19 10:58:17.548 INFO [stderr] ...  |
Dec 19 10:58:17.548 INFO [stderr] 87 | |             })
Dec 19 10:58:17.548 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 19 10:58:17.548 INFO [stderr]    | |_________________________________^
Dec 19 10:58:17.548 INFO [stderr]    |
Dec 19 10:58:17.548 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 10:58:17.548 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 19 10:58:17.548 INFO [stderr] 
Dec 19 10:58:17.580 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.53s
Dec 19 10:58:17.938 INFO running `"docker" "inspect" "874e5157191f30cb67e33e2039def6a0b7ae2a0a23ba926b63004a81ba0c43c7"`
Dec 19 10:58:18.160 INFO running `"docker" "rm" "-f" "874e5157191f30cb67e33e2039def6a0b7ae2a0a23ba926b63004a81ba0c43c7"`
Dec 19 10:58:18.273 INFO [stdout] 874e5157191f30cb67e33e2039def6a0b7ae2a0a23ba926b63004a81ba0c43c7