Dec 12 03:33:22.721 INFO checking Cackbone/2048.rs against master#3a75e80557a103497cffbcab395a2f37061a77ea for pr-56677
Dec 12 03:33:22.722 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56677/worker-4/master#3a75e80557a103497cffbcab395a2f37061a77ea:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56677/master#3a75e80557a103497cffbcab395a2f37061a77ea:/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 +3a75e80557a103497cffbcab395a2f37061a77ea-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 12 03:33:23.332 INFO [stdout] d0772ebd7beb1be51aba9bcfb81d8c63b3c9d5a96c827e75042fc23f58f459ca
Dec 12 03:33:23.334 INFO running `"docker" "start" "-a" "d0772ebd7beb1be51aba9bcfb81d8c63b3c9d5a96c827e75042fc23f58f459ca"`
Dec 12 03:33:25.000 INFO [stderr] usermod: no changes
Dec 12 03:33:25.084 INFO [stderr]     Checking rust_2048 v0.1.0 (/source)
Dec 12 03:33:26.078 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 12 03:33:26.078 INFO [stderr]   --> src/main.rs:18:13
Dec 12 03:33:26.078 INFO [stderr]    |
Dec 12 03:33:26.078 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 12 03:33:26.078 INFO [stderr]    |             ^^^^^^^^
Dec 12 03:33:26.078 INFO [stderr]    |
Dec 12 03:33:26.078 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 12 03:33:26.078 INFO [stderr] 
Dec 12 03:33:26.106 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:33:26.106 INFO [stderr]   --> src/main.rs:97:28
Dec 12 03:33:26.106 INFO [stderr]    |
Dec 12 03:33:26.106 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 12 03:33:26.106 INFO [stderr]    |                            ----^^^^
Dec 12 03:33:26.106 INFO [stderr]    |                            |
Dec 12 03:33:26.106 INFO [stderr]    |                            help: remove this `mut`
Dec 12 03:33:26.106 INFO [stderr]    |
Dec 12 03:33:26.106 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:33:26.106 INFO [stderr] 
Dec 12 03:33:26.108 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:33:26.108 INFO [stderr]    --> src/main.rs:137:13
Dec 12 03:33:26.108 INFO [stderr]     |
Dec 12 03:33:26.108 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 12 03:33:26.108 INFO [stderr]     |             ----^^^^
Dec 12 03:33:26.108 INFO [stderr]     |             |
Dec 12 03:33:26.108 INFO [stderr]     |             help: remove this `mut`
Dec 12 03:33:26.108 INFO [stderr] 
Dec 12 03:33:26.136 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 03:33:26.136 INFO [stderr]   --> src/main.rs:52:13
Dec 12 03:33:26.136 INFO [stderr]    |
Dec 12 03:33:26.136 INFO [stderr] 52 |             Command::new("clear").status();
Dec 12 03:33:26.136 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:33:26.136 INFO [stderr]    |
Dec 12 03:33:26.136 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 03:33:26.136 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 03:33:26.136 INFO [stderr] 
Dec 12 03:33:26.136 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 03:33:26.136 INFO [stderr]   --> src/main.rs:75:5
Dec 12 03:33:26.136 INFO [stderr]    |
Dec 12 03:33:26.136 INFO [stderr] 75 |     Command::new("clear").status();
Dec 12 03:33:26.136 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:33:26.136 INFO [stderr]    |
Dec 12 03:33:26.136 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 03:33:26.136 INFO [stderr] 
Dec 12 03:33:26.478 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 12 03:33:26.478 INFO [stderr]   --> src/main.rs:18:13
Dec 12 03:33:26.478 INFO [stderr]    |
Dec 12 03:33:26.478 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 12 03:33:26.478 INFO [stderr]    |             ^^^^^^^^
Dec 12 03:33:26.478 INFO [stderr]    |
Dec 12 03:33:26.478 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 12 03:33:26.478 INFO [stderr] 
Dec 12 03:33:26.504 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:33:26.504 INFO [stderr]   --> src/main.rs:97:28
Dec 12 03:33:26.504 INFO [stderr]    |
Dec 12 03:33:26.504 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 12 03:33:26.504 INFO [stderr]    |                            ----^^^^
Dec 12 03:33:26.504 INFO [stderr]    |                            |
Dec 12 03:33:26.504 INFO [stderr]    |                            help: remove this `mut`
Dec 12 03:33:26.504 INFO [stderr]    |
Dec 12 03:33:26.508 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 12 03:33:26.508 INFO [stderr] 
Dec 12 03:33:26.508 INFO [stderr] warning: variable does not need to be mutable
Dec 12 03:33:26.508 INFO [stderr]    --> src/main.rs:137:13
Dec 12 03:33:26.508 INFO [stderr]     |
Dec 12 03:33:26.508 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 12 03:33:26.508 INFO [stderr]     |             ----^^^^
Dec 12 03:33:26.508 INFO [stderr]     |             |
Dec 12 03:33:26.508 INFO [stderr]     |             help: remove this `mut`
Dec 12 03:33:26.508 INFO [stderr] 
Dec 12 03:33:26.516 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 03:33:26.516 INFO [stderr]   --> src/main.rs:52:13
Dec 12 03:33:26.516 INFO [stderr]    |
Dec 12 03:33:26.516 INFO [stderr] 52 |             Command::new("clear").status();
Dec 12 03:33:26.516 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:33:26.516 INFO [stderr]    |
Dec 12 03:33:26.516 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 12 03:33:26.516 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 03:33:26.516 INFO [stderr] 
Dec 12 03:33:26.516 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 12 03:33:26.516 INFO [stderr]   --> src/main.rs:75:5
Dec 12 03:33:26.516 INFO [stderr]    |
Dec 12 03:33:26.516 INFO [stderr] 75 |     Command::new("clear").status();
Dec 12 03:33:26.516 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 12 03:33:26.516 INFO [stderr]    |
Dec 12 03:33:26.516 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 12 03:33:26.516 INFO [stderr] 
Dec 12 03:33:26.573 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.54s
Dec 12 03:33:26.587 INFO [stderr] su: No module specific data is present
Dec 12 03:33:27.728 INFO running `"docker" "inspect" "d0772ebd7beb1be51aba9bcfb81d8c63b3c9d5a96c827e75042fc23f58f459ca"`
Dec 12 03:33:28.024 INFO running `"docker" "rm" "-f" "d0772ebd7beb1be51aba9bcfb81d8c63b3c9d5a96c827e75042fc23f58f459ca"`
Dec 12 03:33:28.416 INFO [stdout] d0772ebd7beb1be51aba9bcfb81d8c63b3c9d5a96c827e75042fc23f58f459ca