[INFO] updating cached repository fdb/rustcarver
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/fdb/rustcarver
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/fdb/rustcarver" "work/ex/beta-1.37-6/sources/1.36.0/gh/fdb/rustcarver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/fdb/rustcarver'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/fdb/rustcarver" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fdb/rustcarver"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fdb/rustcarver'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] e231944d03f5507c5ca417de5685bfb826afed3a
[INFO] sha for GitHub repo fdb/rustcarver: e231944d03f5507c5ca417de5685bfb826afed3a
[INFO] validating manifest of fdb/rustcarver 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 fdb/rustcarver 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 fdb/rustcarver
[INFO] finished frobbing fdb/rustcarver
[INFO] frobbed toml for fdb/rustcarver written to work/ex/beta-1.37-6/sources/1.36.0/gh/fdb/rustcarver/Cargo.toml
[INFO] started frobbing fdb/rustcarver
[INFO] finished frobbing fdb/rustcarver
[INFO] frobbed toml for fdb/rustcarver written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/fdb/rustcarver/Cargo.toml
[INFO] crate fdb/rustcarver 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 fdb/rustcarver 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-7/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/fdb/rustcarver:/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] 35ce3dffe0cee06311accd97182c38a7fa7d267d49685686af8fd311e5affe38
[INFO] running `"docker" "start" "-a" "35ce3dffe0cee06311accd97182c38a7fa7d267d49685686af8fd311e5affe38"`
[INFO] [stderr]    Compiling dirs v1.0.4
[INFO] [stderr]    Compiling rustcarver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `home_dir`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let home_dir = dirs::home_dir().unwrap();
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_home_dir`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.04s
[INFO] running `"docker" "inspect" "35ce3dffe0cee06311accd97182c38a7fa7d267d49685686af8fd311e5affe38"`
[INFO] running `"docker" "rm" "-f" "35ce3dffe0cee06311accd97182c38a7fa7d267d49685686af8fd311e5affe38"`
[INFO] [stdout] 35ce3dffe0cee06311accd97182c38a7fa7d267d49685686af8fd311e5affe38
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/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/fdb/rustcarver:/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] 4dba3f7b183ed1494d1a2cc0a5e9d3d69e358f94bac17a9a78e9e386ebf64681
[INFO] running `"docker" "start" "-a" "4dba3f7b183ed1494d1a2cc0a5e9d3d69e358f94bac17a9a78e9e386ebf64681"`
[INFO] [stderr]    Compiling rustcarver v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused variable: `home_dir`
[INFO] [stderr]   --> src/main.rs:16:9
[INFO] [stderr]    |
[INFO] [stderr] 16 |     let home_dir = dirs::home_dir().unwrap();
[INFO] [stderr]    |         ^^^^^^^^ help: consider prefixing with an underscore: `_home_dir`
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_variables)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "4dba3f7b183ed1494d1a2cc0a5e9d3d69e358f94bac17a9a78e9e386ebf64681"`
[INFO] running `"docker" "rm" "-f" "4dba3f7b183ed1494d1a2cc0a5e9d3d69e358f94bac17a9a78e9e386ebf64681"`
[INFO] [stdout] 4dba3f7b183ed1494d1a2cc0a5e9d3d69e358f94bac17a9a78e9e386ebf64681
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-7/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/fdb/rustcarver:/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] 6e5c2b9d69832982b1f6dea808836648db13b9b5101b7020d2767033350d0e6f
[INFO] running `"docker" "start" "-a" "6e5c2b9d69832982b1f6dea808836648db13b9b5101b7020d2767033350d0e6f"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rustcarver-ef356a5478f5b295
[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" "6e5c2b9d69832982b1f6dea808836648db13b9b5101b7020d2767033350d0e6f"`
[INFO] running `"docker" "rm" "-f" "6e5c2b9d69832982b1f6dea808836648db13b9b5101b7020d2767033350d0e6f"`
[INFO] [stdout] 6e5c2b9d69832982b1f6dea808836648db13b9b5101b7020d2767033350d0e6f