[INFO] updating cached repository AgustinCB/ruthless
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/AgustinCB/ruthless
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/AgustinCB/ruthless" "work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/AgustinCB/ruthless" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/AgustinCB/ruthless"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/AgustinCB/ruthless'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 863f7d937bc50a497fbfda569df553e0edcec4bf
[INFO] sha for GitHub repo AgustinCB/ruthless: 863f7d937bc50a497fbfda569df553e0edcec4bf
[INFO] validating manifest of AgustinCB/ruthless 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 AgustinCB/ruthless 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 AgustinCB/ruthless
[INFO] finished frobbing AgustinCB/ruthless
[INFO] frobbed toml for AgustinCB/ruthless written to work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless/Cargo.toml
[INFO] started frobbing AgustinCB/ruthless
[INFO] finished frobbing AgustinCB/ruthless
[INFO] frobbed toml for AgustinCB/ruthless written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/AgustinCB/ruthless/Cargo.toml
[INFO] crate AgustinCB/ruthless 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] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing AgustinCB/ruthless 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-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless:/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] c23a4adb1296eead22dd3de200c746e1f84147bd00a7cf89a5da0707562259d4
[INFO] running `"docker" "start" "-a" "c23a4adb1296eead22dd3de200c746e1f84147bd00a7cf89a5da0707562259d4"`
[INFO] [stderr]    Compiling backtrace-sys v0.1.28
[INFO] [stderr]    Compiling ring v0.14.6
[INFO] [stderr]    Compiling filetime v0.2.4
[INFO] [stderr]    Compiling xattr v0.2.2
[INFO] [stderr]    Compiling tempdir v0.3.7
[INFO] [stderr]    Compiling serde_derive v1.0.90
[INFO] [stderr]    Compiling uuid v0.7.4
[INFO] [stderr]    Compiling tar v0.4.22
[INFO] [stderr]    Compiling backtrace v0.3.14
[INFO] [stderr]    Compiling failure v0.1.5
[INFO] [stderr]    Compiling serde v1.0.90
[INFO] [stderr]    Compiling serde_json v1.0.39
[INFO] [stderr]    Compiling ruthless v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: constant item is never used: `BTRFS_IOC_INO_LOOKUP_USER`
[INFO] [stderr]   --> src/images.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub(crate) const BTRFS_IOC_INO_LOOKUP_USER: u64 = 62;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 48.45s
[INFO] running `"docker" "inspect" "c23a4adb1296eead22dd3de200c746e1f84147bd00a7cf89a5da0707562259d4"`
[INFO] running `"docker" "rm" "-f" "c23a4adb1296eead22dd3de200c746e1f84147bd00a7cf89a5da0707562259d4"`
[INFO] [stdout] c23a4adb1296eead22dd3de200c746e1f84147bd00a7cf89a5da0707562259d4
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless:/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] 22954f451193576d37775645fae47dd2964f5c1839f41987816d47a02fa67213
[INFO] running `"docker" "start" "-a" "22954f451193576d37775645fae47dd2964f5c1839f41987816d47a02fa67213"`
[INFO] [stderr]    Compiling ruthless v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: constant item is never used: `BTRFS_IOC_INO_LOOKUP_USER`
[INFO] [stderr]   --> src/images.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub(crate) const BTRFS_IOC_INO_LOOKUP_USER: u64 = 62;
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.55s
[INFO] running `"docker" "inspect" "22954f451193576d37775645fae47dd2964f5c1839f41987816d47a02fa67213"`
[INFO] running `"docker" "rm" "-f" "22954f451193576d37775645fae47dd2964f5c1839f41987816d47a02fa67213"`
[INFO] [stdout] 22954f451193576d37775645fae47dd2964f5c1839f41987816d47a02fa67213
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/AgustinCB/ruthless:/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] aa3bf5bb6613c2485376de4a427c6237e512eb490e82304bb3ec7380358f230e
[INFO] running `"docker" "start" "-a" "aa3bf5bb6613c2485376de4a427c6237e512eb490e82304bb3ec7380358f230e"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.19s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/ruthless-82e557716ba9b514
[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" "aa3bf5bb6613c2485376de4a427c6237e512eb490e82304bb3ec7380358f230e"`
[INFO] running `"docker" "rm" "-f" "aa3bf5bb6613c2485376de4a427c6237e512eb490e82304bb3ec7380358f230e"`
[INFO] [stdout] aa3bf5bb6613c2485376de4a427c6237e512eb490e82304bb3ec7380358f230e