[INFO] updating cached repository ksakiyama/my_first_rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/ksakiyama/my_first_rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/ksakiyama/my_first_rust" "work/ex/beta-1.38-1/sources/1.37.0/gh/ksakiyama/my_first_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/ksakiyama/my_first_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/ksakiyama/my_first_rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ksakiyama/my_first_rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ksakiyama/my_first_rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 379fa38916fc3eafbc7031ba21b1cbab75e1257e
[INFO] sha for GitHub repo ksakiyama/my_first_rust: 379fa38916fc3eafbc7031ba21b1cbab75e1257e
[INFO] validating manifest of ksakiyama/my_first_rust 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 ksakiyama/my_first_rust 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 ksakiyama/my_first_rust
[INFO] finished frobbing ksakiyama/my_first_rust
[INFO] frobbed toml for ksakiyama/my_first_rust written to work/ex/beta-1.38-1/sources/1.37.0/gh/ksakiyama/my_first_rust/Cargo.toml
[INFO] started frobbing ksakiyama/my_first_rust
[INFO] finished frobbing ksakiyama/my_first_rust
[INFO] frobbed toml for ksakiyama/my_first_rust written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/ksakiyama/my_first_rust/Cargo.toml
[INFO] crate ksakiyama/my_first_rust 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 ksakiyama/my_first_rust 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/ksakiyama/my_first_rust:/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] ef597945e4dfcf25c7b78248efe300887893c6774ac392bb5212e0fac9d14963
[INFO] running `"docker" "start" "-a" "ef597945e4dfcf25c7b78248efe300887893c6774ac392bb5212e0fac9d14963"`
[INFO] [stderr]    Compiling first_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `read_from_file`
[INFO] [stderr]    --> src/main.rs:101:1
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn read_from_file() -> Vec<Vec<i32>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.89s
[INFO] running `"docker" "inspect" "ef597945e4dfcf25c7b78248efe300887893c6774ac392bb5212e0fac9d14963"`
[INFO] running `"docker" "rm" "-f" "ef597945e4dfcf25c7b78248efe300887893c6774ac392bb5212e0fac9d14963"`
[INFO] [stdout] ef597945e4dfcf25c7b78248efe300887893c6774ac392bb5212e0fac9d14963
[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/ksakiyama/my_first_rust:/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] 77b07aab5ccf4b28642fdf7906e6f22dacba6991911eaa0ec9875b46a61d49e8
[INFO] running `"docker" "start" "-a" "77b07aab5ccf4b28642fdf7906e6f22dacba6991911eaa0ec9875b46a61d49e8"`
[INFO] [stderr]    Compiling first_rust v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: function is never used: `read_from_file`
[INFO] [stderr]    --> src/main.rs:101:1
[INFO] [stderr]     |
[INFO] [stderr] 101 | fn read_from_file() -> Vec<Vec<i32>> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.77s
[INFO] running `"docker" "inspect" "77b07aab5ccf4b28642fdf7906e6f22dacba6991911eaa0ec9875b46a61d49e8"`
[INFO] running `"docker" "rm" "-f" "77b07aab5ccf4b28642fdf7906e6f22dacba6991911eaa0ec9875b46a61d49e8"`
[INFO] [stdout] 77b07aab5ccf4b28642fdf7906e6f22dacba6991911eaa0ec9875b46a61d49e8
[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/ksakiyama/my_first_rust:/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] f3031329cc52c43e4d7a16e6c1b5748e377bf56b619b09099193ce5f9ec87e6e
[INFO] running `"docker" "start" "-a" "f3031329cc52c43e4d7a16e6c1b5748e377bf56b619b09099193ce5f9ec87e6e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/first_rust-254d65f81383ef55
[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" "f3031329cc52c43e4d7a16e6c1b5748e377bf56b619b09099193ce5f9ec87e6e"`
[INFO] running `"docker" "rm" "-f" "f3031329cc52c43e4d7a16e6c1b5748e377bf56b619b09099193ce5f9ec87e6e"`
[INFO] [stdout] f3031329cc52c43e4d7a16e6c1b5748e377bf56b619b09099193ce5f9ec87e6e