[INFO] updating cached repository pierrechevalier83/2048-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/pierrechevalier83/2048-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/pierrechevalier83/2048-rs" "work/ex/pr-59928/sources/master#df25d79a33b0c82b716699a75a41bfdc6089850a/gh/pierrechevalier83/2048-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-59928/sources/master#df25d79a33b0c82b716699a75a41bfdc6089850a/gh/pierrechevalier83/2048-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/pierrechevalier83/2048-rs" "work/ex/pr-59928/sources/try#424a4ae163d6517f301cd4048a4b5dd785be5b2f/gh/pierrechevalier83/2048-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-59928/sources/try#424a4ae163d6517f301cd4048a4b5dd785be5b2f/gh/pierrechevalier83/2048-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8de61e8e0342d54b0ae44b937ecb3952c4d2a94c
[INFO] sha for GitHub repo pierrechevalier83/2048-rs: 8de61e8e0342d54b0ae44b937ecb3952c4d2a94c
[INFO] validating manifest of pierrechevalier83/2048-rs on toolchain master#df25d79a33b0c82b716699a75a41bfdc6089850a
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+df25d79a33b0c82b716699a75a41bfdc6089850a-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of pierrechevalier83/2048-rs on toolchain try#424a4ae163d6517f301cd4048a4b5dd785be5b2f
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+424a4ae163d6517f301cd4048a4b5dd785be5b2f-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing pierrechevalier83/2048-rs
[INFO] finished frobbing pierrechevalier83/2048-rs
[INFO] frobbed toml for pierrechevalier83/2048-rs written to work/ex/pr-59928/sources/master#df25d79a33b0c82b716699a75a41bfdc6089850a/gh/pierrechevalier83/2048-rs/Cargo.toml
[INFO] started frobbing pierrechevalier83/2048-rs
[INFO] finished frobbing pierrechevalier83/2048-rs
[INFO] frobbed toml for pierrechevalier83/2048-rs written to work/ex/pr-59928/sources/try#424a4ae163d6517f301cd4048a4b5dd785be5b2f/gh/pierrechevalier83/2048-rs/Cargo.toml
[INFO] crate pierrechevalier83/2048-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+df25d79a33b0c82b716699a75a41bfdc6089850a-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+424a4ae163d6517f301cd4048a4b5dd785be5b2f-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking pierrechevalier83/2048-rs against master#df25d79a33b0c82b716699a75a41bfdc6089850a for pr-59928
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-59928/worker-1/master#df25d79a33b0c82b716699a75a41bfdc6089850a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-59928/sources/master#df25d79a33b0c82b716699a75a41bfdc6089850a/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" "+df25d79a33b0c82b716699a75a41bfdc6089850a-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 56d820c73717bfae2376c63bfa5fdd52d4a7521c5948e7ec886ffb6526f712db
[INFO] running `"docker" "start" "-a" "56d820c73717bfae2376c63bfa5fdd52d4a7521c5948e7ec886ffb6526f712db"`
[INFO] [stderr]     Checking termion v1.2.0
[INFO] [stderr]     Checking matrix_display v0.3.0
[INFO] [stderr]     Checking num-bigint v0.1.36
[INFO] [stderr]     Checking num-rational v0.1.36
[INFO] [stderr]     Checking num v0.1.37
[INFO] [stderr]     Checking game-2048 v0.5.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/game.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 | /         self.data
[INFO] [stderr] 70 | |             .chunks_mut(4)
[INFO] [stderr] 71 | |             .map(|row| {
[INFO] [stderr] 72 | |                 let (new_row, new_score) = match dir {
[INFO] [stderr] ...  |
[INFO] [stderr] 87 | |             })
[INFO] [stderr] 88 | |             .collect::<Vec<_>>();
[INFO] [stderr]    | |_________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/game.rs:69:9
[INFO] [stderr]    |
[INFO] [stderr] 69 | /         self.data
[INFO] [stderr] 70 | |             .chunks_mut(4)
[INFO] [stderr] 71 | |             .map(|row| {
[INFO] [stderr] 72 | |                 let (new_row, new_score) = match dir {
[INFO] [stderr] ...  |
[INFO] [stderr] 87 | |             })
[INFO] [stderr] 88 | |             .collect::<Vec<_>>();
[INFO] [stderr]    | |_________________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 3.55s
[INFO] running `"docker" "inspect" "56d820c73717bfae2376c63bfa5fdd52d4a7521c5948e7ec886ffb6526f712db"`
[INFO] running `"docker" "rm" "-f" "56d820c73717bfae2376c63bfa5fdd52d4a7521c5948e7ec886ffb6526f712db"`
[INFO] [stdout] 56d820c73717bfae2376c63bfa5fdd52d4a7521c5948e7ec886ffb6526f712db