[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-1.38-1/sources/1.37.0/gh/arvsrao/sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/arvsrao/sudoku-solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/arvsrao/sudoku-solver" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/arvsrao/sudoku-solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of arvsrao/sudoku-solver on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "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-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing arvsrao/sudoku-solver against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] 35ac45fabdadab9ada1692b377798bd3b781f58cf174f2e777279c90da85ef3f
[INFO] running `"docker" "start" "-a" "35ac45fabdadab9ada1692b377798bd3b781f58cf174f2e777279c90da85ef3f"`
[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 0.85s
[INFO] running `"docker" "inspect" "35ac45fabdadab9ada1692b377798bd3b781f58cf174f2e777279c90da85ef3f"`
[INFO] running `"docker" "rm" "-f" "35ac45fabdadab9ada1692b377798bd3b781f58cf174f2e777279c90da85ef3f"`
[INFO] [stdout] 35ac45fabdadab9ada1692b377798bd3b781f58cf174f2e777279c90da85ef3f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] aa735d89307fafb773c7d5cbab6fc78c12ef9af2349c201f8628ce75dd70d74a
[INFO] running `"docker" "start" "-a" "aa735d89307fafb773c7d5cbab6fc78c12ef9af2349c201f8628ce75dd70d74a"`
[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 0.63s
[INFO] running `"docker" "inspect" "aa735d89307fafb773c7d5cbab6fc78c12ef9af2349c201f8628ce75dd70d74a"`
[INFO] running `"docker" "rm" "-f" "aa735d89307fafb773c7d5cbab6fc78c12ef9af2349c201f8628ce75dd70d74a"`
[INFO] [stdout] aa735d89307fafb773c7d5cbab6fc78c12ef9af2349c201f8628ce75dd70d74a
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-0/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 461b22ef4d13b79c44fcb1abe4da3e483212edb58c6aa469f6ef3674b348590c
[INFO] running `"docker" "start" "-a" "461b22ef4d13b79c44fcb1abe4da3e483212edb58c6aa469f6ef3674b348590c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/sudoku-d4ba4fcc52bb4ee9
[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" "461b22ef4d13b79c44fcb1abe4da3e483212edb58c6aa469f6ef3674b348590c"`
[INFO] running `"docker" "rm" "-f" "461b22ef4d13b79c44fcb1abe4da3e483212edb58c6aa469f6ef3674b348590c"`
[INFO] [stdout] 461b22ef4d13b79c44fcb1abe4da3e483212edb58c6aa469f6ef3674b348590c