[INFO] updating cached repository https://github.com/ffjanp/sudoku_solver
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/big/crater/work/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] a5129652558878ae06295ea3b7cf9317f731f6c9
[INFO] testing ffjanp/sudoku_solver against 1.38.0 for beta-1.39-1
[INFO] running `"git" "clone" "work/cache/git-repos/https%3A%2F%2Fgithub.com%2Fffjanp%2Fsudoku_solver" "work/builds/worker-2/source"`
[INFO] [stderr] Cloning into 'work/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ffjanp/sudoku_solver on toolchain 1.38.0
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ffjanp/sudoku_solver
[INFO] finished tweaking git repo https://github.com/ffjanp/sudoku_solver
[INFO] tweaked toml for git repo https://github.com/ffjanp/sudoku_solver written to work/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/ffjanp/sudoku_solver already has a lockfile, it will not be regenerated
[INFO] running `"/big/crater/work/cargo-home/bin/cargo" "+1.38.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "build" "--frozen"`
[INFO] [stdout] 10b93f39ee9fe4e1565a65912f3002c760331f97a8873cb442b4b8c3ed5967f4
[INFO] running `"docker" "start" "-a" "10b93f39ee9fe4e1565a65912f3002c760331f97a8873cb442b4b8c3ed5967f4"`
[INFO] [stderr]    Compiling find_transaction v0.1.0 (/opt/rustwide/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 0.40s
[INFO] running `"docker" "inspect" "10b93f39ee9fe4e1565a65912f3002c760331f97a8873cb442b4b8c3ed5967f4"`
[INFO] running `"docker" "rm" "-f" "10b93f39ee9fe4e1565a65912f3002c760331f97a8873cb442b4b8c3ed5967f4"`
[INFO] [stdout] 10b93f39ee9fe4e1565a65912f3002c760331f97a8873cb442b4b8c3ed5967f4
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 3c8c3218cbec2e14e1da488e5ea98db23c154983349987174c3f5d39436555c8
[INFO] running `"docker" "start" "-a" "3c8c3218cbec2e14e1da488e5ea98db23c154983349987174c3f5d39436555c8"`
[INFO] [stderr]    Compiling find_transaction v0.1.0 (/opt/rustwide/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 0.26s
[INFO] running `"docker" "inspect" "3c8c3218cbec2e14e1da488e5ea98db23c154983349987174c3f5d39436555c8"`
[INFO] running `"docker" "rm" "-f" "3c8c3218cbec2e14e1da488e5ea98db23c154983349987174c3f5d39436555c8"`
[INFO] [stdout] 3c8c3218cbec2e14e1da488e5ea98db23c154983349987174c3f5d39436555c8
[INFO] running `"docker" "create" "-v" "/big/crater/work/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/big/crater/work/builds/worker-2/source:/opt/rustwide/workdir:ro,Z" "-v" "/big/crater/work/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/big/crater/work/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=warn" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+1.38.0" "test" "--frozen"`
[INFO] [stdout] 1688ad906fc7f8d56a68a92baeb5b5afa2471d5ff5f0718503609b075533c9bc
[INFO] running `"docker" "start" "-a" "1688ad906fc7f8d56a68a92baeb5b5afa2471d5ff5f0718503609b075533c9bc"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.00s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/find_transaction-acec8e3aac9df980
[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" "1688ad906fc7f8d56a68a92baeb5b5afa2471d5ff5f0718503609b075533c9bc"`
[INFO] running `"docker" "rm" "-f" "1688ad906fc7f8d56a68a92baeb5b5afa2471d5ff5f0718503609b075533c9bc"`
[INFO] [stdout] 1688ad906fc7f8d56a68a92baeb5b5afa2471d5ff5f0718503609b075533c9bc