[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 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-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "build" "--frozen"`
[INFO] [stdout] dc2246afd1c88ffd786985c69c4e07b93601507f4a0b2f3e9f05c33864a1b86d
[INFO] running `"docker" "start" "-a" "dc2246afd1c88ffd786985c69c4e07b93601507f4a0b2f3e9f05c33864a1b86d"`
[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 1.08s
[INFO] running `"docker" "inspect" "dc2246afd1c88ffd786985c69c4e07b93601507f4a0b2f3e9f05c33864a1b86d"`
[INFO] running `"docker" "rm" "-f" "dc2246afd1c88ffd786985c69c4e07b93601507f4a0b2f3e9f05c33864a1b86d"`
[INFO] [stdout] dc2246afd1c88ffd786985c69c4e07b93601507f4a0b2f3e9f05c33864a1b86d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 285e4c8af7e366131520380ab460df1e1cc1144ba66b5dc0d7ee24e09512ab00
[INFO] running `"docker" "start" "-a" "285e4c8af7e366131520380ab460df1e1cc1144ba66b5dc0d7ee24e09512ab00"`
[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 0.73s
[INFO] running `"docker" "inspect" "285e4c8af7e366131520380ab460df1e1cc1144ba66b5dc0d7ee24e09512ab00"`
[INFO] running `"docker" "rm" "-f" "285e4c8af7e366131520380ab460df1e1cc1144ba66b5dc0d7ee24e09512ab00"`
[INFO] [stdout] 285e4c8af7e366131520380ab460df1e1cc1144ba66b5dc0d7ee24e09512ab00
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/1.36.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.37-6/sources/1.36.0/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" "+1.36.0" "test" "--frozen"`
[INFO] [stdout] da94e3198411466f2c6822c837595f3c3977f1294761c0a91dd758cf58fa525c
[INFO] running `"docker" "start" "-a" "da94e3198411466f2c6822c837595f3c3977f1294761c0a91dd758cf58fa525c"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/find_transaction-5cffc1fdf8f1f115
[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" "da94e3198411466f2c6822c837595f3c3977f1294761c0a91dd758cf58fa525c"`
[INFO] running `"docker" "rm" "-f" "da94e3198411466f2c6822c837595f3c3977f1294761c0a91dd758cf58fa525c"`
[INFO] [stdout] da94e3198411466f2c6822c837595f3c3977f1294761c0a91dd758cf58fa525c