[INFO] updating cached repository jakobbeckmann/sudoku
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/jakobbeckmann/sudoku
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/jakobbeckmann/sudoku" "work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jakobbeckmann/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jakobbeckmann/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/jakobbeckmann/sudoku" "work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jakobbeckmann/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jakobbeckmann/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8c3b1208e5b1361da88105ab855c9c15e4b19ae2
[INFO] sha for GitHub repo jakobbeckmann/sudoku: 8c3b1208e5b1361da88105ab855c9c15e4b19ae2
[INFO] validating manifest of jakobbeckmann/sudoku on toolchain master#5f9c0448dde167128d668da4555879f64e56af1d
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of jakobbeckmann/sudoku on toolchain try#8ec8125bea94852768b56958f05da47666c21ab0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing jakobbeckmann/sudoku
[INFO] finished frobbing jakobbeckmann/sudoku
[INFO] frobbed toml for jakobbeckmann/sudoku written to work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jakobbeckmann/sudoku/Cargo.toml
[INFO] started frobbing jakobbeckmann/sudoku
[INFO] finished frobbing jakobbeckmann/sudoku
[INFO] frobbed toml for jakobbeckmann/sudoku written to work/ex/pr-62133/sources/try#8ec8125bea94852768b56958f05da47666c21ab0/gh/jakobbeckmann/sudoku/Cargo.toml
[INFO] crate jakobbeckmann/sudoku already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+8ec8125bea94852768b56958f05da47666c21ab0-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking jakobbeckmann/sudoku against master#5f9c0448dde167128d668da4555879f64e56af1d for pr-62133
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-62133/worker-2/master#5f9c0448dde167128d668da4555879f64e56af1d:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-62133/sources/master#5f9c0448dde167128d668da4555879f64e56af1d/gh/jakobbeckmann/sudoku:/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" "+5f9c0448dde167128d668da4555879f64e56af1d-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 2e2670e503b7f7fc981211695a3308bfc3471f608fa8ccb3edf87e200df9aa55
[INFO] running `"docker" "start" "-a" "2e2670e503b7f7fc981211695a3308bfc3471f608fa8ccb3edf87e200df9aa55"`
[INFO] [stderr]     Checking num-rational v0.1.40
[INFO] [stderr]     Checking piston2d-graphics v0.23.0
[INFO] [stderr]     Checking pistoncore-input v0.20.0
[INFO] [stderr]     Checking image v0.17.0
[INFO] [stderr]     Checking pistoncore-window v0.30.0
[INFO] [stderr]     Checking piston2d-opengl_graphics v0.49.0
[INFO] [stderr]     Checking pistoncore-event_loop v0.35.0
[INFO] [stderr]     Checking pistoncore-glutin_window v0.42.0
[INFO] [stderr]     Checking piston v0.35.0
[INFO] [stderr]     Checking sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: the item `rand` is imported redundantly
[INFO] [stderr]   --> src/gameboard.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |         use rand;
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/main.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | extern crate rand;
[INFO] [stderr]    | ------------------ the item `rand` is already imported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `idx`
[INFO] [stderr]   --> src/gameboard.rs:63:17
[INFO] [stderr]    |
[INFO] [stderr] 63 |             for idx in 0..80 {
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_idx`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: the item `rand` is imported redundantly
[INFO] [stderr]   --> src/gameboard.rs:56:13
[INFO] [stderr]    |
[INFO] [stderr] 56 |         use rand;
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    | 
[INFO] [stderr]   ::: src/main.rs:9:1
[INFO] [stderr]    |
[INFO] [stderr] 9  | extern crate rand;
[INFO] [stderr]    | ------------------ the item `rand` is already imported here
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_imports)] on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `idx`
[INFO] [stderr]   --> src/gameboard.rs:63:17
[INFO] [stderr]    |
[INFO] [stderr] 63 |             for idx in 0..80 {
[INFO] [stderr]    |                 ^^^ help: consider prefixing with an underscore: `_idx`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.75s
[INFO] running `"docker" "inspect" "2e2670e503b7f7fc981211695a3308bfc3471f608fa8ccb3edf87e200df9aa55"`
[INFO] running `"docker" "rm" "-f" "2e2670e503b7f7fc981211695a3308bfc3471f608fa8ccb3edf87e200df9aa55"`
[INFO] [stdout] 2e2670e503b7f7fc981211695a3308bfc3471f608fa8ccb3edf87e200df9aa55