Dec 17 17:51:04.074 INFO checking pierrechevalier83/2048-rs against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 17:51:04.075 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-6/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 17:51:04.439 INFO [stdout] 0e3eb046ca633eda3591c02a28f5321204e438033893ef8395ce18087c9cb0b4
Dec 17 17:51:04.446 INFO running `"docker" "start" "-a" "0e3eb046ca633eda3591c02a28f5321204e438033893ef8395ce18087c9cb0b4"`
Dec 17 17:51:05.273 INFO [stderr]     Checking termion v1.2.0
Dec 17 17:51:05.273 INFO [stderr]     Checking matrix_display v0.3.0
Dec 17 17:51:05.273 INFO [stderr]     Checking num-bigint v0.1.36
Dec 17 17:51:06.668 INFO [stderr]     Checking num-rational v0.1.36
Dec 17 17:51:07.177 INFO [stderr]     Checking num v0.1.37
Dec 17 17:51:07.464 INFO [stderr]     Checking game-2048 v0.5.1 (/opt/crater/workdir)
Dec 17 17:51:08.237 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 17 17:51:08.237 INFO [stderr]   --> src/game.rs:69:9
Dec 17 17:51:08.237 INFO [stderr]    |
Dec 17 17:51:08.237 INFO [stderr] 69 | /         self.data
Dec 17 17:51:08.237 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 17 17:51:08.237 INFO [stderr] 71 | |             .map(|row| {
Dec 17 17:51:08.237 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 17 17:51:08.237 INFO [stderr] ...  |
Dec 17 17:51:08.237 INFO [stderr] 87 | |             })
Dec 17 17:51:08.237 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 17 17:51:08.237 INFO [stderr]    | |_________________________________^
Dec 17 17:51:08.237 INFO [stderr]    |
Dec 17 17:51:08.237 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 17 17:51:08.237 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 17 17:51:08.237 INFO [stderr] 
Dec 17 17:51:08.304 INFO [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
Dec 17 17:51:08.304 INFO [stderr]   --> src/game.rs:69:9
Dec 17 17:51:08.304 INFO [stderr]    |
Dec 17 17:51:08.304 INFO [stderr] 69 | /         self.data
Dec 17 17:51:08.304 INFO [stderr] 70 | |             .chunks_mut(4)
Dec 17 17:51:08.304 INFO [stderr] 71 | |             .map(|row| {
Dec 17 17:51:08.304 INFO [stderr] 72 | |                 let (new_row, new_score) = match dir {
Dec 17 17:51:08.304 INFO [stderr] ...  |
Dec 17 17:51:08.304 INFO [stderr] 87 | |             })
Dec 17 17:51:08.304 INFO [stderr] 88 | |             .collect::<Vec<_>>();
Dec 17 17:51:08.304 INFO [stderr]    | |_________________________________^
Dec 17 17:51:08.304 INFO [stderr]    |
Dec 17 17:51:08.304 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 17 17:51:08.304 INFO [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Dec 17 17:51:08.304 INFO [stderr] 
Dec 17 17:51:08.333 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.12s
Dec 17 17:51:09.033 INFO running `"docker" "inspect" "0e3eb046ca633eda3591c02a28f5321204e438033893ef8395ce18087c9cb0b4"`
Dec 17 17:51:09.286 INFO running `"docker" "rm" "-f" "0e3eb046ca633eda3591c02a28f5321204e438033893ef8395ce18087c9cb0b4"`
Dec 17 17:51:09.540 INFO [stdout] 0e3eb046ca633eda3591c02a28f5321204e438033893ef8395ce18087c9cb0b4