[INFO] updating cached repository benschulz/acid
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/benschulz/acid
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/benschulz/acid" "work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/benschulz/acid" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/benschulz/acid"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/benschulz/acid'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] ec1bd69980497694fbeb4bfef0d0506078924a0e
[INFO] sha for GitHub repo benschulz/acid: ec1bd69980497694fbeb4bfef0d0506078924a0e
[INFO] validating manifest of benschulz/acid 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 benschulz/acid 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 benschulz/acid
[INFO] finished frobbing benschulz/acid
[INFO] frobbed toml for benschulz/acid written to work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid/Cargo.toml
[INFO] started frobbing benschulz/acid
[INFO] finished frobbing benschulz/acid
[INFO] frobbed toml for benschulz/acid written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/benschulz/acid/Cargo.toml
[INFO] crate benschulz/acid 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 benschulz/acid 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-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid:/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] 5e05e018130118f6addf773b5c4983830181d1e13f15be42068bee958a48a899
[INFO] running `"docker" "start" "-a" "5e05e018130118f6addf773b5c4983830181d1e13f15be42068bee958a48a899"`
[INFO] [stderr]    Compiling acid v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.58s
[INFO] running `"docker" "inspect" "5e05e018130118f6addf773b5c4983830181d1e13f15be42068bee958a48a899"`
[INFO] running `"docker" "rm" "-f" "5e05e018130118f6addf773b5c4983830181d1e13f15be42068bee958a48a899"`
[INFO] [stdout] 5e05e018130118f6addf773b5c4983830181d1e13f15be42068bee958a48a899
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid:/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] af82f21c2f807cc29a96f4aa0174f4db51ebe8c824d1f79408b5234ab2bbb935
[INFO] running `"docker" "start" "-a" "af82f21c2f807cc29a96f4aa0174f4db51ebe8c824d1f79408b5234ab2bbb935"`
[INFO] [stderr]    Compiling acid v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/lib.rs:51:5
[INFO] [stderr]    |
[INFO] [stderr] 51 |     acid.clone();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `std::clone::Clone::clone` that must be used
[INFO] [stderr]   --> src/lib.rs:52:5
[INFO] [stderr]    |
[INFO] [stderr] 52 |     acid.clone();
[INFO] [stderr]    |     ^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: cloning is often expensive and is not expected to have side effects
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `"docker" "inspect" "af82f21c2f807cc29a96f4aa0174f4db51ebe8c824d1f79408b5234ab2bbb935"`
[INFO] running `"docker" "rm" "-f" "af82f21c2f807cc29a96f4aa0174f4db51ebe8c824d1f79408b5234ab2bbb935"`
[INFO] [stdout] af82f21c2f807cc29a96f4aa0174f4db51ebe8c824d1f79408b5234ab2bbb935
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-6/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/benschulz/acid:/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] 72196fb4310ceb4578fbe4c482c8acb79968856c6caf3e65f116a66160e4f858
[INFO] running `"docker" "start" "-a" "72196fb4310ceb4578fbe4c482c8acb79968856c6caf3e65f116a66160e4f858"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/acid-a6cddf0c24f9a9ca
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test it_should_panic_when_running_out_of_ids ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]      Running /opt/crater/target/debug/deps/test-45b12e34a111714e
[INFO] [stdout] 
[INFO] [stdout] running 1 test
[INFO] [stdout] test ids_for_two_clones_should_differ ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 1 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] [stderr]    Doc-tests acid
[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" "72196fb4310ceb4578fbe4c482c8acb79968856c6caf3e65f116a66160e4f858"`
[INFO] running `"docker" "rm" "-f" "72196fb4310ceb4578fbe4c482c8acb79968856c6caf3e65f116a66160e4f858"`
[INFO] [stdout] 72196fb4310ceb4578fbe4c482c8acb79968856c6caf3e65f116a66160e4f858