[INFO] updating cached repository LEARAX/pack_2048
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/LEARAX/pack_2048
[INFO] [stderr]  * branch              HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/LEARAX/pack_2048" "work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/LEARAX/pack_2048"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/LEARAX/pack_2048'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/LEARAX/pack_2048" "work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/LEARAX/pack_2048"`
[INFO] [stderr] Cloning into 'work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/LEARAX/pack_2048'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 3de73554b72497eafda48ab42814ca1f698003bd
[INFO] sha for GitHub repo LEARAX/pack_2048: 3de73554b72497eafda48ab42814ca1f698003bd
[INFO] validating manifest of LEARAX/pack_2048 on toolchain master#452087b4bf18cece2d52d7cd8c9147195e5404bf
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of LEARAX/pack_2048 on toolchain try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing LEARAX/pack_2048
[INFO] finished frobbing LEARAX/pack_2048
[INFO] frobbed toml for LEARAX/pack_2048 written to work/ex/pr-63247/sources/master#452087b4bf18cece2d52d7cd8c9147195e5404bf/gh/LEARAX/pack_2048/Cargo.toml
[INFO] started frobbing LEARAX/pack_2048
[INFO] finished frobbing LEARAX/pack_2048
[INFO] frobbed toml for LEARAX/pack_2048 written to work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/LEARAX/pack_2048/Cargo.toml
[INFO] crate LEARAX/pack_2048 already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+452087b4bf18cece2d52d7cd8c9147195e5404bf-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking LEARAX/pack_2048 against try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab for pr-63247
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-63247/worker-3/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-63247/sources/try#757dacae0a9f1b46b3ab58a1f1232332e8fc7dab/gh/LEARAX/pack_2048:/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" "+757dacae0a9f1b46b3ab58a1f1232332e8fc7dab-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] fb5a0ff6c2fe27768a6f247ed4d385d554f67107d8103906f8de97ca5507108c
[INFO] running `"docker" "start" "-a" "fb5a0ff6c2fe27768a6f247ed4d385d554f67107d8103906f8de97ca5507108c"`
[INFO] [stderr]     Checking termion v1.5.1
[INFO] [stderr]     Checking rand v0.5.4
[INFO] [stderr]     Checking pack_2048 v0.4.4 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:105:13
[INFO] [stderr]     |
[INFO] [stderr] 105 |         for mut row in &mut board.iter_mut() {
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:165:13
[INFO] [stderr]     |
[INFO] [stderr] 165 |         for mut row in &mut board.iter_mut() {
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:105:13
[INFO] [stderr]     |
[INFO] [stderr] 105 |         for mut row in &mut board.iter_mut() {
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]    --> src/lib.rs:165:13
[INFO] [stderr]     |
[INFO] [stderr] 165 |         for mut row in &mut board.iter_mut() {
[INFO] [stderr]     |             ----^^^
[INFO] [stderr]     |             |
[INFO] [stderr]     |             help: remove this `mut`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 4.22s
[INFO] running `"docker" "inspect" "fb5a0ff6c2fe27768a6f247ed4d385d554f67107d8103906f8de97ca5507108c"`
[INFO] running `"docker" "rm" "-f" "fb5a0ff6c2fe27768a6f247ed4d385d554f67107d8103906f8de97ca5507108c"`
[INFO] [stdout] fb5a0ff6c2fe27768a6f247ed4d385d554f67107d8103906f8de97ca5507108c