[INFO] updating cached repository joeyrosztoczy/rust-book-exercises
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/joeyrosztoczy/rust-book-exercises
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/joeyrosztoczy/rust-book-exercises" "work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/joeyrosztoczy/rust-book-exercises" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/joeyrosztoczy/rust-book-exercises"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/joeyrosztoczy/rust-book-exercises'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 99c769183420d26f6a7a7ddc189099cb0eaf5fee
[INFO] sha for GitHub repo joeyrosztoczy/rust-book-exercises: 99c769183420d26f6a7a7ddc189099cb0eaf5fee
[INFO] validating manifest of joeyrosztoczy/rust-book-exercises 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 joeyrosztoczy/rust-book-exercises 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 joeyrosztoczy/rust-book-exercises
[INFO] finished frobbing joeyrosztoczy/rust-book-exercises
[INFO] frobbed toml for joeyrosztoczy/rust-book-exercises written to work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises/Cargo.toml
[INFO] started frobbing joeyrosztoczy/rust-book-exercises
[INFO] finished frobbing joeyrosztoczy/rust-book-exercises
[INFO] frobbed toml for joeyrosztoczy/rust-book-exercises written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/joeyrosztoczy/rust-book-exercises/Cargo.toml
[INFO] crate joeyrosztoczy/rust-book-exercises 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 joeyrosztoczy/rust-book-exercises 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-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises:/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] 532ecfbddbbe66dfd3e7f4453dca2bf92596349fec3d67d53bf95df0827d6406
[INFO] running `"docker" "start" "-a" "532ecfbddbbe66dfd3e7f4453dca2bf92596349fec3d67d53bf95df0827d6406"`
[INFO] [stderr]    Compiling rust-bk-exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.01s
[INFO] running `"docker" "inspect" "532ecfbddbbe66dfd3e7f4453dca2bf92596349fec3d67d53bf95df0827d6406"`
[INFO] running `"docker" "rm" "-f" "532ecfbddbbe66dfd3e7f4453dca2bf92596349fec3d67d53bf95df0827d6406"`
[INFO] [stdout] 532ecfbddbbe66dfd3e7f4453dca2bf92596349fec3d67d53bf95df0827d6406
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises:/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] 3012157b4c063774323370d0a9f2c1379380dc07c82c715c032e5cb383058753
[INFO] running `"docker" "start" "-a" "3012157b4c063774323370d0a9f2c1379380dc07c82c715c032e5cb383058753"`
[INFO] [stderr]    Compiling rust-bk-exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.68s
[INFO] running `"docker" "inspect" "3012157b4c063774323370d0a9f2c1379380dc07c82c715c032e5cb383058753"`
[INFO] running `"docker" "rm" "-f" "3012157b4c063774323370d0a9f2c1379380dc07c82c715c032e5cb383058753"`
[INFO] [stdout] 3012157b4c063774323370d0a9f2c1379380dc07c82c715c032e5cb383058753
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-2/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/joeyrosztoczy/rust-book-exercises:/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] 8653aa8375731903150a2e27602082e81d4bf8e09a0c5c461bb48bbe23d1deb4
[INFO] running `"docker" "start" "-a" "8653aa8375731903150a2e27602082e81d4bf8e09a0c5c461bb48bbe23d1deb4"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.01s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/rust_bk_exercises-069bf26b3567b06e
[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" "8653aa8375731903150a2e27602082e81d4bf8e09a0c5c461bb48bbe23d1deb4"`
[INFO] running `"docker" "rm" "-f" "8653aa8375731903150a2e27602082e81d4bf8e09a0c5c461bb48bbe23d1deb4"`
[INFO] [stdout] 8653aa8375731903150a2e27602082e81d4bf8e09a0c5c461bb48bbe23d1deb4