[INFO] updating cached repository H2CO3/sudoku
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/H2CO3/sudoku
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/H2CO3/sudoku" "work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/H2CO3/sudoku" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/H2CO3/sudoku"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/H2CO3/sudoku'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 8e62adee840042e0fa2e6b961626bce4a08b0889
[INFO] sha for GitHub repo H2CO3/sudoku: 8e62adee840042e0fa2e6b961626bce4a08b0889
[INFO] validating manifest of H2CO3/sudoku 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 H2CO3/sudoku 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 H2CO3/sudoku
[INFO] finished frobbing H2CO3/sudoku
[INFO] frobbed toml for H2CO3/sudoku written to work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku/Cargo.toml
[INFO] started frobbing H2CO3/sudoku
[INFO] finished frobbing H2CO3/sudoku
[INFO] frobbed toml for H2CO3/sudoku written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/H2CO3/sudoku/Cargo.toml
[INFO] crate H2CO3/sudoku 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 H2CO3/sudoku 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku:/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] 74276b99ddc0aa1ef0be00593734f8467009be9855ebc1261097fcc29d2ace48
[INFO] running `"docker" "start" "-a" "74276b99ddc0aa1ef0be00593734f8467009be9855ebc1261097fcc29d2ace48"`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]    --> src/main.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |     let s2 = Grid {
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_s2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.22s
[INFO] running `"docker" "inspect" "74276b99ddc0aa1ef0be00593734f8467009be9855ebc1261097fcc29d2ace48"`
[INFO] running `"docker" "rm" "-f" "74276b99ddc0aa1ef0be00593734f8467009be9855ebc1261097fcc29d2ace48"`
[INFO] [stdout] 74276b99ddc0aa1ef0be00593734f8467009be9855ebc1261097fcc29d2ace48
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku:/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] 3572676c9990217d348d25d0c3c197368324cd5da5707cf4127ae668f400a685
[INFO] running `"docker" "start" "-a" "3572676c9990217d348d25d0c3c197368324cd5da5707cf4127ae668f400a685"`
[INFO] [stderr]    Compiling sudoku v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `s2`
[INFO] [stderr]    --> src/main.rs:113:9
[INFO] [stderr]     |
[INFO] [stderr] 113 |     let s2 = Grid {
[INFO] [stderr]     |         ^^ help: consider prefixing with an underscore: `_s2`
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "3572676c9990217d348d25d0c3c197368324cd5da5707cf4127ae668f400a685"`
[INFO] running `"docker" "rm" "-f" "3572676c9990217d348d25d0c3c197368324cd5da5707cf4127ae668f400a685"`
[INFO] [stdout] 3572676c9990217d348d25d0c3c197368324cd5da5707cf4127ae668f400a685
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/H2CO3/sudoku:/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] ab807a3ac691af14437115a13e0e07cde44644c940f687238157c107ec9d17e2
[INFO] running `"docker" "start" "-a" "ab807a3ac691af14437115a13e0e07cde44644c940f687238157c107ec9d17e2"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[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" "ab807a3ac691af14437115a13e0e07cde44644c940f687238157c107ec9d17e2"`
[INFO] running `"docker" "rm" "-f" "ab807a3ac691af14437115a13e0e07cde44644c940f687238157c107ec9d17e2"`
[INFO] [stdout] ab807a3ac691af14437115a13e0e07cde44644c940f687238157c107ec9d17e2