[INFO] updating cached repository kbknapp/cli2048-rs
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kbknapp/cli2048-rs
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kbknapp/cli2048-rs" "work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/kbknapp/cli2048-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/kbknapp/cli2048-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kbknapp/cli2048-rs" "work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/kbknapp/cli2048-rs"`
[INFO] [stderr] Cloning into 'work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/kbknapp/cli2048-rs'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 22aeeb9704928402819c251c925cdd35e48ed498
[INFO] sha for GitHub repo kbknapp/cli2048-rs: 22aeeb9704928402819c251c925cdd35e48ed498
[INFO] validating manifest of kbknapp/cli2048-rs on toolchain master#a850a426491e14186af2250549bf41256b5938d2
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of kbknapp/cli2048-rs on toolchain try#06a150c7d11500b41499224f165e9de1de096768
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing kbknapp/cli2048-rs
[INFO] finished frobbing kbknapp/cli2048-rs
[INFO] frobbed toml for kbknapp/cli2048-rs written to work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/kbknapp/cli2048-rs/Cargo.toml
[INFO] started frobbing kbknapp/cli2048-rs
[INFO] finished frobbing kbknapp/cli2048-rs
[INFO] frobbed toml for kbknapp/cli2048-rs written to work/ex/pr-60162/sources/try#06a150c7d11500b41499224f165e9de1de096768/gh/kbknapp/cli2048-rs/Cargo.toml
[INFO] crate kbknapp/cli2048-rs already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] error: the lock file /mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/kbknapp/cli2048-rs/Cargo.lock needs to be updated but --locked was passed to prevent this
[INFO] the lockfile is outdated, regenerating it
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "generate-lockfile" "--manifest-path" "Cargo.toml" "-Zno-index-update"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+a850a426491e14186af2250549bf41256b5938d2-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/crater-raid/crater/work/local/cargo-home/bin/cargo" "+06a150c7d11500b41499224f165e9de1de096768-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking kbknapp/cli2048-rs against master#a850a426491e14186af2250549bf41256b5938d2 for pr-60162
[INFO] running `"docker" "create" "-v" "/mnt/crater-raid/crater/work/local/target-dirs/pr-60162/worker-3/master#a850a426491e14186af2250549bf41256b5938d2:/opt/crater/target:rw,Z" "-v" "/mnt/crater-raid/crater/work/ex/pr-60162/sources/master#a850a426491e14186af2250549bf41256b5938d2/gh/kbknapp/cli2048-rs:/opt/crater/workdir:ro,Z" "-v" "/mnt/crater-raid/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/crater-raid/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" "+a850a426491e14186af2250549bf41256b5938d2-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 682c97140b1f7c4bda287ed627742647fdc2fe1d6028e34b3c7519a6ec2e4e1b
[INFO] running `"docker" "start" "-a" "682c97140b1f7c4bda287ed627742647fdc2fe1d6028e34b3c7519a6ec2e4e1b"`
[INFO] [stderr]     Checking cli2048-rs v0.0.1 (/opt/crater/workdir)
[INFO] [stderr] warning: struct is never constructed: `Matrix`
[INFO] [stderr]  --> src/matrix.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Matrix {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Matrix`
[INFO] [stderr]  --> src/matrix.rs:1:1
[INFO] [stderr]   |
[INFO] [stderr] 1 | struct Matrix {
[INFO] [stderr]   | ^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]  --> src/main.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let matches = App::new("cli2048")
[INFO] [stderr]   |         ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `matches`
[INFO] [stderr]  --> src/main.rs:6:6
[INFO] [stderr]   |
[INFO] [stderr] 6 |     let matches = App::new("cli2048")
[INFO] [stderr]   |         ^^^^^^^ help: consider prefixing with an underscore: `_matches`
[INFO] [stderr]   |
[INFO] [stderr]   = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.80s
[INFO] running `"docker" "inspect" "682c97140b1f7c4bda287ed627742647fdc2fe1d6028e34b3c7519a6ec2e4e1b"`
[INFO] running `"docker" "rm" "-f" "682c97140b1f7c4bda287ed627742647fdc2fe1d6028e34b3c7519a6ec2e4e1b"`
[INFO] [stdout] 682c97140b1f7c4bda287ed627742647fdc2fe1d6028e34b3c7519a6ec2e4e1b