Oct 12 15:42:27.766 INFO checking pierrechevalier83/2048-rs against try#4021bd0b3c5815b087d6db10ce461e7e4854ade7 for pr-54977
Oct 12 15:42:27.767 INFO running `"docker" "create" "-v" "/mnt/big/crater/./work/local/target-dirs/pr-54977/worker-3/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/target:rw,Z" "-v" "/mnt/big/crater/./work/local/test-source/worker-3/pr-54977/try#4021bd0b3c5815b087d6db10ce461e7e4854ade7:/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 +4021bd0b3c5815b087d6db10ce461e7e4854ade7-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"`
Oct 12 15:42:28.344 INFO blam! ef527aa3e9556850e66c5a2e321d381c28febd8fe73d9c8b503279ee5345b4ae
Oct 12 15:42:28.345 INFO running `"docker" "start" "-a" "ef527aa3e9556850e66c5a2e321d381c28febd8fe73d9c8b503279ee5345b4ae"`
Oct 12 15:42:29.308 INFO kablam! usermod: no changes
Oct 12 15:42:29.464 INFO kablam!     Checking termion v1.2.0
Oct 12 15:42:29.464 INFO kablam!     Checking num-complex v0.1.36
Oct 12 15:42:29.464 INFO kablam!     Checking matrix_display v0.3.0
Oct 12 15:42:29.464 INFO kablam!     Checking num-bigint v0.1.36
Oct 12 15:42:32.413 INFO kablam!     Checking num-rational v0.1.36
Oct 12 15:42:33.121 INFO kablam!     Checking num v0.1.37
Oct 12 15:42:33.551 INFO kablam!     Checking game-2048 v0.5.1 (/source)
Oct 12 15:42:34.583 INFO kablam! warning: unused return value of `std::iter::Iterator::collect` which must be used
Oct 12 15:42:34.583 INFO kablam!   --> src/game.rs:69:9
Oct 12 15:42:34.583 INFO kablam!    |
Oct 12 15:42:34.583 INFO kablam! 69 | /         self.data
Oct 12 15:42:34.583 INFO kablam! 70 | |             .chunks_mut(4)
Oct 12 15:42:34.583 INFO kablam! 71 | |             .map(|row| {
Oct 12 15:42:34.583 INFO kablam! 72 | |                 let (new_row, new_score) = match dir {
Oct 12 15:42:34.583 INFO kablam! ...  |
Oct 12 15:42:34.583 INFO kablam! 87 | |             })
Oct 12 15:42:34.583 INFO kablam! 88 | |             .collect::<Vec<_>>();
Oct 12 15:42:34.583 INFO kablam!    | |_________________________________^
Oct 12 15:42:34.583 INFO kablam!    |
Oct 12 15:42:34.583 INFO kablam!    = note: #[warn(unused_must_use)] on by default
Oct 12 15:42:34.583 INFO kablam!    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Oct 12 15:42:34.583 INFO kablam! 
Oct 12 15:42:34.656 INFO kablam! warning: unused return value of `std::iter::Iterator::collect` which must be used
Oct 12 15:42:34.656 INFO kablam!   --> src/game.rs:69:9
Oct 12 15:42:34.656 INFO kablam!    |
Oct 12 15:42:34.656 INFO kablam! 69 | /         self.data
Oct 12 15:42:34.656 INFO kablam! 70 | |             .chunks_mut(4)
Oct 12 15:42:34.656 INFO kablam! 71 | |             .map(|row| {
Oct 12 15:42:34.656 INFO kablam! 72 | |                 let (new_row, new_score) = match dir {
Oct 12 15:42:34.656 INFO kablam! ...  |
Oct 12 15:42:34.656 INFO kablam! 87 | |             })
Oct 12 15:42:34.656 INFO kablam! 88 | |             .collect::<Vec<_>>();
Oct 12 15:42:34.656 INFO kablam!    | |_________________________________^
Oct 12 15:42:34.656 INFO kablam!    |
Oct 12 15:42:34.656 INFO kablam!    = note: #[warn(unused_must_use)] on by default
Oct 12 15:42:34.656 INFO kablam!    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
Oct 12 15:42:34.656 INFO kablam! 
Oct 12 15:42:34.700 INFO kablam!     Finished dev [unoptimized + debuginfo] target(s) in 5.37s
Oct 12 15:42:34.703 INFO kablam! su: No module specific data is present
Oct 12 15:42:35.712 INFO running `"docker" "rm" "-f" "ef527aa3e9556850e66c5a2e321d381c28febd8fe73d9c8b503279ee5345b4ae"`
Oct 12 15:42:36.001 INFO blam! ef527aa3e9556850e66c5a2e321d381c28febd8fe73d9c8b503279ee5345b4ae