[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-1.37-6/sources/1.36.0/gh/ffjanp/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/ffjanp/sudoku_solver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ffjanp/sudoku_solver" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/ffjanp/sudoku_solver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/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 1.36.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.36.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of ffjanp/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 ffjanp/sudoku_solver
[INFO] finished frobbing ffjanp/sudoku_solver
[INFO] frobbed toml for ffjanp/sudoku_solver written to work/ex/beta-1.37-6/sources/1.36.0/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-1.37-6/sources/beta-2019-07-23/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" "+1.36.0" "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 ffjanp/sudoku_solver against beta-2019-07-23 for beta-1.37-6
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 260e4ee88aa932915855177f7663af80e851924aa37ddc077708a7f909e8951c
[INFO] running `"docker" "start" "-a" "260e4ee88aa932915855177f7663af80e851924aa37ddc077708a7f909e8951c"`
[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 1.17s
[INFO] running `"docker" "inspect" "260e4ee88aa932915855177f7663af80e851924aa37ddc077708a7f909e8951c"`
[INFO] running `"docker" "rm" "-f" "260e4ee88aa932915855177f7663af80e851924aa37ddc077708a7f909e8951c"`
[INFO] [stdout] 260e4ee88aa932915855177f7663af80e851924aa37ddc077708a7f909e8951c
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] f165298a89cb01174c25940425f9e5bcd7c4e5cfa9c277599ce6652f24c8460f
[INFO] running `"docker" "start" "-a" "f165298a89cb01174c25940425f9e5bcd7c4e5cfa9c277599ce6652f24c8460f"`
[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 0.61s
[INFO] running `"docker" "inspect" "f165298a89cb01174c25940425f9e5bcd7c4e5cfa9c277599ce6652f24c8460f"`
[INFO] running `"docker" "rm" "-f" "f165298a89cb01174c25940425f9e5bcd7c4e5cfa9c277599ce6652f24c8460f"`
[INFO] [stdout] f165298a89cb01174c25940425f9e5bcd7c4e5cfa9c277599ce6652f24c8460f
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-1/beta-2019-07-23:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/beta-2019-07-23/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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] fb4a44315fefd64404d560384df671ae65571b509a8266c050ccd1b7ee70ac26
[INFO] running `"docker" "start" "-a" "fb4a44315fefd64404d560384df671ae65571b509a8266c050ccd1b7ee70ac26"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/find_transaction-1e3eaed2a1bafb6e
[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" "fb4a44315fefd64404d560384df671ae65571b509a8266c050ccd1b7ee70ac26"`
[INFO] running `"docker" "rm" "-f" "fb4a44315fefd64404d560384df671ae65571b509a8266c050ccd1b7ee70ac26"`
[INFO] [stdout] fb4a44315fefd64404d560384df671ae65571b509a8266c050ccd1b7ee70ac26