[INFO] updating cached repository arvsrao/sudoku-solver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/arvsrao/sudoku-solver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/arvsrao/sudoku-solver" "work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arvsrao/sudoku-solver" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arvsrao/sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arvsrao/sudoku-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c0088272e5264faef6a64243d222237f5fe80748
[INFO] sha for GitHub repo arvsrao/sudoku-solver: c0088272e5264faef6a64243d222237f5fe80748
[INFO] validating manifest of arvsrao/sudoku-solver on toolchain 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of arvsrao/sudoku-solver on toolchain beta-2019-07-23
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing arvsrao/sudoku-solver
[INFO] finished frobbing arvsrao/sudoku-solver
[INFO] frobbed toml for arvsrao/sudoku-solver written to work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver/Cargo.toml
[INFO] started frobbing arvsrao/sudoku-solver
[INFO] finished frobbing arvsrao/sudoku-solver
[INFO] frobbed toml for arvsrao/sudoku-solver written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/arvsrao/sudoku-solver/Cargo.toml
[INFO] crate arvsrao/sudoku-solver already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-07-23" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing arvsrao/sudoku-solver against 1.36.0 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver:/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=warn" "-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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] 0d97a8f671dde75755aa8845686f47a4a6aa6ac4cc025e3fdf8c2f5d38078e17
[INFO] running `"docker" "start" "-a" "0d97a8f671dde75755aa8845686f47a4a6aa6ac4cc025e3fdf8c2f5d38078e17"`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `outcome`
[INFO] [stderr]    --> src/main.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |     let outcome = play(&mut hard_game);
[INFO] [stderr]     |         ^^^^^^^ help: consider prefixing with an underscore: `_outcome`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.87s
[INFO] running `"docker" "inspect" "0d97a8f671dde75755aa8845686f47a4a6aa6ac4cc025e3fdf8c2f5d38078e17"`
[INFO] running `"docker" "rm" "-f" "0d97a8f671dde75755aa8845686f47a4a6aa6ac4cc025e3fdf8c2f5d38078e17"`
[INFO] [stdout] 0d97a8f671dde75755aa8845686f47a4a6aa6ac4cc025e3fdf8c2f5d38078e17
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver:/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=warn" "-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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 95d1a72acc20e9fe855d118a6f5ea7b70aa1dac27d1309a398223982464b6af1
[INFO] running `"docker" "start" "-a" "95d1a72acc20e9fe855d118a6f5ea7b70aa1dac27d1309a398223982464b6af1"`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `outcome`
[INFO] [stderr]    --> src/main.rs:134:9
[INFO] [stderr]     |
[INFO] [stderr] 134 |     let outcome = play(&mut hard_game);
[INFO] [stderr]     |         ^^^^^^^ help: consider prefixing with an underscore: `_outcome`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.72s
[INFO] running `"docker" "inspect" "95d1a72acc20e9fe855d118a6f5ea7b70aa1dac27d1309a398223982464b6af1"`
[INFO] running `"docker" "rm" "-f" "95d1a72acc20e9fe855d118a6f5ea7b70aa1dac27d1309a398223982464b6af1"`
[INFO] [stdout] 95d1a72acc20e9fe855d118a6f5ea7b70aa1dac27d1309a398223982464b6af1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-0/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/gh/arvsrao/sudoku-solver:/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=warn" "-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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] 2449f4ec0bdf9984cc070606fdbd9fa6caff7e610bb01eae1a42ca5716191eba
[INFO] running `"docker" "start" "-a" "2449f4ec0bdf9984cc070606fdbd9fa6caff7e610bb01eae1a42ca5716191eba"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sudoku-80f64e952268a83b
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "2449f4ec0bdf9984cc070606fdbd9fa6caff7e610bb01eae1a42ca5716191eba"`
[INFO] running `"docker" "rm" "-f" "2449f4ec0bdf9984cc070606fdbd9fa6caff7e610bb01eae1a42ca5716191eba"`
[INFO] [stdout] 2449f4ec0bdf9984cc070606fdbd9fa6caff7e610bb01eae1a42ca5716191eba