[INFO] updating cached repository GrahamClark/collections-exercises-rust
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/GrahamClark/collections-exercises-rust
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/GrahamClark/collections-exercises-rust" "work/ex/beta-1.37-6/sources/1.36.0/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/1.36.0/gh/GrahamClark/collections-exercises-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/GrahamClark/collections-exercises-rust" "work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GrahamClark/collections-exercises-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 07217f7bbfeea46e91534db8ae932919ea060e90
[INFO] sha for GitHub repo GrahamClark/collections-exercises-rust: 07217f7bbfeea46e91534db8ae932919ea060e90
[INFO] validating manifest of GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust
[INFO] finished frobbing GrahamClark/collections-exercises-rust
[INFO] frobbed toml for GrahamClark/collections-exercises-rust written to work/ex/beta-1.37-6/sources/1.36.0/gh/GrahamClark/collections-exercises-rust/Cargo.toml
[INFO] started frobbing GrahamClark/collections-exercises-rust
[INFO] finished frobbing GrahamClark/collections-exercises-rust
[INFO] frobbed toml for GrahamClark/collections-exercises-rust written to work/ex/beta-1.37-6/sources/beta-2019-07-23/gh/GrahamClark/collections-exercises-rust/Cargo.toml
[INFO] crate GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust 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-2/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/GrahamClark/collections-exercises-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" "+beta-2019-07-23" "build" "--frozen"`
[INFO] [stdout] 8e884eac4c85ff8b48affb97d5337f6251f3460694999718deab2bee1bf2ff48
[INFO] running `"docker" "start" "-a" "8e884eac4c85ff8b48affb97d5337f6251f3460694999718deab2bee1bf2ff48"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.79s
[INFO] running `"docker" "inspect" "8e884eac4c85ff8b48affb97d5337f6251f3460694999718deab2bee1bf2ff48"`
[INFO] running `"docker" "rm" "-f" "8e884eac4c85ff8b48affb97d5337f6251f3460694999718deab2bee1bf2ff48"`
[INFO] [stdout] 8e884eac4c85ff8b48affb97d5337f6251f3460694999718deab2bee1bf2ff48
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/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/GrahamClark/collections-exercises-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" "+beta-2019-07-23" "test" "--frozen" "--no-run"`
[INFO] [stdout] 8d7d753130bad9d6a4f9ab0cb25309b485706f8f21bdab39e38129a58ec20363
[INFO] running `"docker" "start" "-a" "8d7d753130bad9d6a4f9ab0cb25309b485706f8f21bdab39e38129a58ec20363"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.76s
[INFO] running `"docker" "inspect" "8d7d753130bad9d6a4f9ab0cb25309b485706f8f21bdab39e38129a58ec20363"`
[INFO] running `"docker" "rm" "-f" "8d7d753130bad9d6a4f9ab0cb25309b485706f8f21bdab39e38129a58ec20363"`
[INFO] [stdout] 8d7d753130bad9d6a4f9ab0cb25309b485706f8f21bdab39e38129a58ec20363
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.37-6/worker-2/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/GrahamClark/collections-exercises-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" "+beta-2019-07-23" "test" "--frozen"`
[INFO] [stdout] d1cbb7ef79e15fd3f8be5904ae57273833e9cf5a511e93e590d83e16c5fd804b
[INFO] running `"docker" "start" "-a" "d1cbb7ef79e15fd3f8be5904ae57273833e9cf5a511e93e590d83e16c5fd804b"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-fdde3ee6ecdb40b9
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-6b51918c9e614f17
[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] [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] [stderr]    Doc-tests collections_exercises
[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" "d1cbb7ef79e15fd3f8be5904ae57273833e9cf5a511e93e590d83e16c5fd804b"`
[INFO] running `"docker" "rm" "-f" "d1cbb7ef79e15fd3f8be5904ae57273833e9cf5a511e93e590d83e16c5fd804b"`
[INFO] [stdout] d1cbb7ef79e15fd3f8be5904ae57273833e9cf5a511e93e590d83e16c5fd804b