[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-1.38-1/sources/1.37.0/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/GrahamClark/collections-exercises-rust'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/GrahamClark/collections-exercises-rust" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/GrahamClark/collections-exercises-rust"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/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 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of GrahamClark/collections-exercises-rust 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 GrahamClark/collections-exercises-rust
[INFO] finished frobbing GrahamClark/collections-exercises-rust
[INFO] frobbed toml for GrahamClark/collections-exercises-rust written to work/ex/beta-1.38-1/sources/1.37.0/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-1.38-1/sources/beta-2019-08-13/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" "+1.37.0" "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 GrahamClark/collections-exercises-rust against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "build" "--frozen"`
[INFO] [stdout] 9b92fea48d9ad762261486cf97bf75f76c0f94e620c7eb5fb016c3e198adcec8
[INFO] running `"docker" "start" "-a" "9b92fea48d9ad762261486cf97bf75f76c0f94e620c7eb5fb016c3e198adcec8"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.68s
[INFO] running `"docker" "inspect" "9b92fea48d9ad762261486cf97bf75f76c0f94e620c7eb5fb016c3e198adcec8"`
[INFO] running `"docker" "rm" "-f" "9b92fea48d9ad762261486cf97bf75f76c0f94e620c7eb5fb016c3e198adcec8"`
[INFO] [stdout] 9b92fea48d9ad762261486cf97bf75f76c0f94e620c7eb5fb016c3e198adcec8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 57da68641b66267fe028c2df975f2a0e236dbfbe3d169be25c9d5e9fc65bb2d8
[INFO] running `"docker" "start" "-a" "57da68641b66267fe028c2df975f2a0e236dbfbe3d169be25c9d5e9fc65bb2d8"`
[INFO] [stderr]    Compiling collections_exercises v0.1.0 (/opt/crater/workdir)
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
[INFO] running `"docker" "inspect" "57da68641b66267fe028c2df975f2a0e236dbfbe3d169be25c9d5e9fc65bb2d8"`
[INFO] running `"docker" "rm" "-f" "57da68641b66267fe028c2df975f2a0e236dbfbe3d169be25c9d5e9fc65bb2d8"`
[INFO] [stdout] 57da68641b66267fe028c2df975f2a0e236dbfbe3d169be25c9d5e9fc65bb2d8
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-5/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/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-2019-08-13" "test" "--frozen"`
[INFO] [stdout] dae64820d170dd436d900fc36ea3fa56b2f414c184df7724d68e76a154a3eda0
[INFO] running `"docker" "start" "-a" "dae64820d170dd436d900fc36ea3fa56b2f414c184df7724d68e76a154a3eda0"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.03s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-27004a6722125e40
[INFO] [stderr]      Running /opt/crater/target/debug/deps/collections_exercises-957fcb84b48490f1
[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] [stderr]    Doc-tests collections_exercises
[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] running `"docker" "inspect" "dae64820d170dd436d900fc36ea3fa56b2f414c184df7724d68e76a154a3eda0"`
[INFO] running `"docker" "rm" "-f" "dae64820d170dd436d900fc36ea3fa56b2f414c184df7724d68e76a154a3eda0"`
[INFO] [stdout] dae64820d170dd436d900fc36ea3fa56b2f414c184df7724d68e76a154a3eda0