Dec 05 03:10:04.193 INFO checking Cackbone/2048.rs against try#1df97983eb2057dc6a8f7eb364e263b51ae23230 for pr-56481
Dec 05 03:10:04.193 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56481/worker-0/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-0/pr-56481/try#1df97983eb2057dc6a8f7eb364e263b51ae23230:/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 +1df97983eb2057dc6a8f7eb364e263b51ae23230-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 05 03:10:04.753 INFO [stdout] 90ce3b9f7e3196bee0a63ee7ff6a9cc0ea6879797186fc900d6a8889be95d751
Dec 05 03:10:04.755 INFO running `"docker" "start" "-a" "90ce3b9f7e3196bee0a63ee7ff6a9cc0ea6879797186fc900d6a8889be95d751"`
Dec 05 03:10:05.923 INFO [stderr] usermod: no changes
Dec 05 03:10:06.047 INFO [stderr]     Checking rust_2048 v0.1.0 (/source)
Dec 05 03:10:06.903 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 05 03:10:06.903 INFO [stderr]   --> src/main.rs:18:13
Dec 05 03:10:06.903 INFO [stderr]    |
Dec 05 03:10:06.903 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 05 03:10:06.903 INFO [stderr]    |             ^^^^^^^^
Dec 05 03:10:06.903 INFO [stderr]    |
Dec 05 03:10:06.903 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 05 03:10:06.903 INFO [stderr] 
Dec 05 03:10:06.911 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:10:06.911 INFO [stderr]   --> src/main.rs:97:28
Dec 05 03:10:06.911 INFO [stderr]    |
Dec 05 03:10:06.911 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 05 03:10:06.911 INFO [stderr]    |                            ----^^^^
Dec 05 03:10:06.911 INFO [stderr]    |                            |
Dec 05 03:10:06.911 INFO [stderr]    |                            help: remove this `mut`
Dec 05 03:10:06.911 INFO [stderr]    |
Dec 05 03:10:06.911 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:10:06.911 INFO [stderr] 
Dec 05 03:10:06.911 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:10:06.911 INFO [stderr]    --> src/main.rs:137:13
Dec 05 03:10:06.911 INFO [stderr]     |
Dec 05 03:10:06.911 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 05 03:10:06.911 INFO [stderr]     |             ----^^^^
Dec 05 03:10:06.911 INFO [stderr]     |             |
Dec 05 03:10:06.911 INFO [stderr]     |             help: remove this `mut`
Dec 05 03:10:06.911 INFO [stderr] 
Dec 05 03:10:06.923 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:10:06.923 INFO [stderr]   --> src/main.rs:52:13
Dec 05 03:10:06.923 INFO [stderr]    |
Dec 05 03:10:06.923 INFO [stderr] 52 |             Command::new("clear").status();
Dec 05 03:10:06.923 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 03:10:06.923 INFO [stderr]    |
Dec 05 03:10:06.923 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 03:10:06.923 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:10:06.923 INFO [stderr] 
Dec 05 03:10:06.923 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:10:06.923 INFO [stderr]   --> src/main.rs:75:5
Dec 05 03:10:06.923 INFO [stderr]    |
Dec 05 03:10:06.923 INFO [stderr] 75 |     Command::new("clear").status();
Dec 05 03:10:06.923 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 03:10:06.923 INFO [stderr]    |
Dec 05 03:10:06.923 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:10:06.923 INFO [stderr] 
Dec 05 03:10:06.963 INFO [stderr] warning: value assigned to `grid_bis` is never read
Dec 05 03:10:06.963 INFO [stderr]   --> src/main.rs:18:13
Dec 05 03:10:06.963 INFO [stderr]    |
Dec 05 03:10:06.963 INFO [stderr] 18 |     let mut grid_bis = [[0i8; 4];4];
Dec 05 03:10:06.963 INFO [stderr]    |             ^^^^^^^^
Dec 05 03:10:06.963 INFO [stderr]    |
Dec 05 03:10:06.963 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 05 03:10:06.963 INFO [stderr] 
Dec 05 03:10:06.974 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:10:06.974 INFO [stderr]   --> src/main.rs:97:28
Dec 05 03:10:06.974 INFO [stderr]    |
Dec 05 03:10:06.974 INFO [stderr] 97 | fn move_grid(d: Direction, mut grid: &mut [[i8; 4]; 4])
Dec 05 03:10:06.974 INFO [stderr]    |                            ----^^^^
Dec 05 03:10:06.974 INFO [stderr]    |                            |
Dec 05 03:10:06.974 INFO [stderr]    |                            help: remove this `mut`
Dec 05 03:10:06.974 INFO [stderr]    |
Dec 05 03:10:06.974 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 05 03:10:06.974 INFO [stderr] 
Dec 05 03:10:06.974 INFO [stderr] warning: variable does not need to be mutable
Dec 05 03:10:06.974 INFO [stderr]    --> src/main.rs:137:13
Dec 05 03:10:06.974 INFO [stderr]     |
Dec 05 03:10:06.974 INFO [stderr] 137 | fn add_tile(mut grid: &mut [[i8; 4]; 4])
Dec 05 03:10:06.974 INFO [stderr]     |             ----^^^^
Dec 05 03:10:06.974 INFO [stderr]     |             |
Dec 05 03:10:06.974 INFO [stderr]     |             help: remove this `mut`
Dec 05 03:10:06.974 INFO [stderr] 
Dec 05 03:10:06.982 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:10:06.982 INFO [stderr]   --> src/main.rs:52:13
Dec 05 03:10:06.982 INFO [stderr]    |
Dec 05 03:10:06.982 INFO [stderr] 52 |             Command::new("clear").status();
Dec 05 03:10:06.982 INFO [stderr]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 03:10:06.982 INFO [stderr]    |
Dec 05 03:10:06.982 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 03:10:06.982 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:10:06.982 INFO [stderr] 
Dec 05 03:10:06.982 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 03:10:06.982 INFO [stderr]   --> src/main.rs:75:5
Dec 05 03:10:06.982 INFO [stderr]    |
Dec 05 03:10:06.982 INFO [stderr] 75 |     Command::new("clear").status();
Dec 05 03:10:06.982 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 03:10:06.983 INFO [stderr]    |
Dec 05 03:10:06.983 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 03:10:06.983 INFO [stderr] 
Dec 05 03:10:07.019 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.05s
Dec 05 03:10:07.023 INFO [stderr] su: No module specific data is present
Dec 05 03:10:07.871 INFO running `"docker" "inspect" "90ce3b9f7e3196bee0a63ee7ff6a9cc0ea6879797186fc900d6a8889be95d751"`
Dec 05 03:10:08.171 INFO running `"docker" "rm" "-f" "90ce3b9f7e3196bee0a63ee7ff6a9cc0ea6879797186fc900d6a8889be95d751"`
Dec 05 03:10:08.567 INFO [stdout] 90ce3b9f7e3196bee0a63ee7ff6a9cc0ea6879797186fc900d6a8889be95d751