[INFO] updating cached repository ffjanp/sudoku_solver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ffjanp/sudoku_solver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ffjanp/sudoku_solver" "work/ex/beta-1.38-1/sources/1.37.0/gh/ffjanp/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ffjanp/sudoku_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ffjanp/sudoku_solver" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ffjanp/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ffjanp/sudoku_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a5129652558878ae06295ea3b7cf9317f731f6c9
[INFO] sha for GitHub repo ffjanp/sudoku_solver: a5129652558878ae06295ea3b7cf9317f731f6c9
[INFO] validating manifest of ffjanp/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 ffjanp/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 ffjanp/sudoku_solver
[INFO] finished frobbing ffjanp/sudoku_solver
[INFO] frobbed toml for ffjanp/sudoku_solver written to work/ex/beta-1.38-1/sources/1.37.0/gh/ffjanp/sudoku_solver/Cargo.toml
[INFO] started frobbing ffjanp/sudoku_solver
[INFO] finished frobbing ffjanp/sudoku_solver
[INFO] frobbed toml for ffjanp/sudoku_solver written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ffjanp/sudoku_solver/Cargo.toml
[INFO] crate ffjanp/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 ffjanp/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/ffjanp/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] 6f17437930dc72a43b071d2d6b3d6880f5f014f606641cee2840e0bb97ba781c
[INFO] running `"docker" "start" "-a" "6f17437930dc72a43b071d2d6b3d6880f5f014f606641cee2840e0bb97ba781c"`
[INFO] [stderr]    Compiling find_transaction v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:25
[INFO] [stderr]    |
[INFO] [stderr] 72 |                     let mut possible = self.check(x,y);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 1.11s
[INFO] running `"docker" "inspect" "6f17437930dc72a43b071d2d6b3d6880f5f014f606641cee2840e0bb97ba781c"`
[INFO] running `"docker" "rm" "-f" "6f17437930dc72a43b071d2d6b3d6880f5f014f606641cee2840e0bb97ba781c"`
[INFO] [stdout] 6f17437930dc72a43b071d2d6b3d6880f5f014f606641cee2840e0bb97ba781c
[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/ffjanp/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] ff4f27c9650565c21db9c1c7361c30c158d6d7e5c0163d0edd953ed3682341b8
[INFO] running `"docker" "start" "-a" "ff4f27c9650565c21db9c1c7361c30c158d6d7e5c0163d0edd953ed3682341b8"`
[INFO] [stderr]    Compiling find_transaction v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/main.rs:72:25
[INFO] [stderr]    |
[INFO] [stderr] 72 |                     let mut possible = self.check(x,y);
[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]     Finished dev [unoptimized + debuginfo] target(s) in 0.79s
[INFO] running `"docker" "inspect" "ff4f27c9650565c21db9c1c7361c30c158d6d7e5c0163d0edd953ed3682341b8"`
[INFO] running `"docker" "rm" "-f" "ff4f27c9650565c21db9c1c7361c30c158d6d7e5c0163d0edd953ed3682341b8"`
[INFO] [stdout] ff4f27c9650565c21db9c1c7361c30c158d6d7e5c0163d0edd953ed3682341b8
[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/ffjanp/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] 3c6c3b152f0168aeb0f30b7c079215c35d8216a0192be6de85d5aee7e7a4a670
[INFO] running `"docker" "start" "-a" "3c6c3b152f0168aeb0f30b7c079215c35d8216a0192be6de85d5aee7e7a4a670"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.05s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/find_transaction-289f3f480c1aa623
[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" "3c6c3b152f0168aeb0f30b7c079215c35d8216a0192be6de85d5aee7e7a4a670"`
[INFO] running `"docker" "rm" "-f" "3c6c3b152f0168aeb0f30b7c079215c35d8216a0192be6de85d5aee7e7a4a670"`
[INFO] [stdout] 3c6c3b152f0168aeb0f30b7c079215c35d8216a0192be6de85d5aee7e7a4a670