Dec 18 08:13:29.165 INFO checking Cackbone/2048.rs against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 18 08:13:29.165 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-0/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/Cackbone/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 18 08:13:29.775 INFO [stdout] 9309f6d1e3e226f3a06bde9727655d141f1f3866543aa6d845cad3ee7229f3d3
Dec 18 08:13:29.777 INFO running `"docker" "start" "-a" "9309f6d1e3e226f3a06bde9727655d141f1f3866543aa6d845cad3ee7229f3d3"`
Dec 18 08:13:31.572 INFO [stderr]     Checking rust_2048 v0.1.0 (/opt/crater/workdir)
Dec 18 08:13:32.196 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 18 08:13:32.196 INFO [stderr]   --> src/main.rs:18:13
Dec 18 08:13:32.196 INFO [stderr]    |
Dec 18 08:13:32.196 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 18 08:13:32.196 INFO [stderr]    |             ^^^^^^^^
Dec 18 08:13:32.196 INFO [stderr]    |
Dec 18 08:13:32.196 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 18 08:13:32.196 INFO [stderr] 
Dec 18 08:13:32.196 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 18 08:13:32.196 INFO [stderr]   --> src/main.rs:18:13
Dec 18 08:13:32.196 INFO [stderr]    |
Dec 18 08:13:32.196 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 18 08:13:32.196 INFO [stderr]    |             ^^^^^^^^
Dec 18 08:13:32.196 INFO [stderr]    |
Dec 18 08:13:32.196 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 18 08:13:32.196 INFO [stderr] 
Dec 18 08:13:32.216 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:13:32.216 INFO [stderr]   --> src/main.rs:97:28
Dec 18 08:13:32.216 INFO [stderr]    |
Dec 18 08:13:32.216 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 18 08:13:32.216 INFO [stderr]    |                            ----^^^^
Dec 18 08:13:32.216 INFO [stderr]    |                            |
Dec 18 08:13:32.216 INFO [stderr]    |                            help: remove this `mut`
Dec 18 08:13:32.216 INFO [stderr]    |
Dec 18 08:13:32.216 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:13:32.216 INFO [stderr] 
Dec 18 08:13:32.218 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:13:32.218 INFO [stderr]    --> src/main.rs:137:13
Dec 18 08:13:32.218 INFO [stderr]     |
Dec 18 08:13:32.219 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 18 08:13:32.219 INFO [stderr]     |             ----^^^^
Dec 18 08:13:32.219 INFO [stderr]     |             |
Dec 18 08:13:32.219 INFO [stderr]     |             help: remove this `mut`
Dec 18 08:13:32.219 INFO [stderr] 
Dec 18 08:13:32.228 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:13:32.229 INFO [stderr]   --> src/main.rs:97:28
Dec 18 08:13:32.229 INFO [stderr]    |
Dec 18 08:13:32.229 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 18 08:13:32.229 INFO [stderr]    |                            ----^^^^
Dec 18 08:13:32.230 INFO [stderr]    |                            |
Dec 18 08:13:32.230 INFO [stderr]    |                            help: remove this `mut`
Dec 18 08:13:32.230 INFO [stderr]    |
Dec 18 08:13:32.230 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 18 08:13:32.230 INFO [stderr] 
Dec 18 08:13:32.230 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:13:32.230 INFO [stderr]   --> src/main.rs:52:13
Dec 18 08:13:32.230 INFO [stderr]    |
Dec 18 08:13:32.230 INFO [stderr] 52 |             Command::new("clear").status();
Dec 18 08:13:32.230 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 08:13:32.230 INFO [stderr]    |
Dec 18 08:13:32.230 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 08:13:32.230 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:13:32.230 INFO [stderr] 
Dec 18 08:13:32.230 INFO [stderr] warning: variable does not need to be mutable
Dec 18 08:13:32.230 INFO [stderr]    --> src/main.rs:137:13
Dec 18 08:13:32.230 INFO [stderr]     |
Dec 18 08:13:32.230 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 18 08:13:32.230 INFO [stderr]     |             ----^^^^
Dec 18 08:13:32.230 INFO [stderr]     |             |
Dec 18 08:13:32.230 INFO [stderr]     |             help: remove this `mut`
Dec 18 08:13:32.230 INFO [stderr] 
Dec 18 08:13:32.230 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:13:32.230 INFO [stderr]   --> src/main.rs:75:5
Dec 18 08:13:32.230 INFO [stderr]    |
Dec 18 08:13:32.230 INFO [stderr] 75 |     Command::new("clear").status();
Dec 18 08:13:32.230 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 08:13:32.230 INFO [stderr]    |
Dec 18 08:13:32.230 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:13:32.230 INFO [stderr] 
Dec 18 08:13:32.256 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:13:32.256 INFO [stderr]   --> src/main.rs:52:13
Dec 18 08:13:32.256 INFO [stderr]    |
Dec 18 08:13:32.256 INFO [stderr] 52 |             Command::new("clear").status();
Dec 18 08:13:32.256 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 08:13:32.256 INFO [stderr]    |
Dec 18 08:13:32.256 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 18 08:13:32.256 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:13:32.256 INFO [stderr] 
Dec 18 08:13:32.256 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 18 08:13:32.256 INFO [stderr]   --> src/main.rs:75:5
Dec 18 08:13:32.256 INFO [stderr]    |
Dec 18 08:13:32.257 INFO [stderr] 75 |     Command::new("clear").status();
Dec 18 08:13:32.257 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 18 08:13:32.257 INFO [stderr]    |
Dec 18 08:13:32.257 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 18 08:13:32.257 INFO [stderr] 
Dec 18 08:13:32.263 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.73s
Dec 18 08:13:32.926 INFO running `"docker" "inspect" "9309f6d1e3e226f3a06bde9727655d141f1f3866543aa6d845cad3ee7229f3d3"`
Dec 18 08:13:33.172 INFO running `"docker" "rm" "-f" "9309f6d1e3e226f3a06bde9727655d141f1f3866543aa6d845cad3ee7229f3d3"`
Dec 18 08:13:33.524 INFO [stdout] 9309f6d1e3e226f3a06bde9727655d141f1f3866543aa6d845cad3ee7229f3d3