[INFO] updating cached repository kpcyrd/defcon26-pow
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/kpcyrd/defcon26-pow
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/kpcyrd/defcon26-pow" "work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/kpcyrd/defcon26-pow" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kpcyrd/defcon26-pow"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kpcyrd/defcon26-pow'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d17edcaf67cb2a8455e7797f3a373b9c250a3cee
[INFO] sha for GitHub repo kpcyrd/defcon26-pow: d17edcaf67cb2a8455e7797f3a373b9c250a3cee
[INFO] validating manifest of kpcyrd/defcon26-pow 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 kpcyrd/defcon26-pow 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 kpcyrd/defcon26-pow
[INFO] finished frobbing kpcyrd/defcon26-pow
[INFO] frobbed toml for kpcyrd/defcon26-pow written to work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow/Cargo.toml
[INFO] started frobbing kpcyrd/defcon26-pow
[INFO] finished frobbing kpcyrd/defcon26-pow
[INFO] frobbed toml for kpcyrd/defcon26-pow written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/kpcyrd/defcon26-pow/Cargo.toml
[INFO] crate kpcyrd/defcon26-pow 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 kpcyrd/defcon26-pow 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-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow:/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] 3a8692ade26ad71a9b13da1a679d7014b81e97e20fca7a9e517759cf825e3a19
[INFO] running `"docker" "start" "-a" "3a8692ade26ad71a9b13da1a679d7014b81e97e20fca7a9e517759cf825e3a19"`
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling digest v0.7.2
[INFO] [stderr]    Compiling sha2 v0.7.1
[INFO] [stderr]    Compiling num-bigint v0.1.43
[INFO] [stderr]    Compiling defcon26-pow v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/main.rs:82:5
[INFO] [stderr]    |
[INFO] [stderr] 82 | /     children.into_iter()
[INFO] [stderr] 83 | |         .map(|c| c.join().unwrap())
[INFO] [stderr] 84 | |         .collect::<Vec<_>>();
[INFO] [stderr]    | |_____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 10.18s
[INFO] running `"docker" "inspect" "3a8692ade26ad71a9b13da1a679d7014b81e97e20fca7a9e517759cf825e3a19"`
[INFO] running `"docker" "rm" "-f" "3a8692ade26ad71a9b13da1a679d7014b81e97e20fca7a9e517759cf825e3a19"`
[INFO] [stdout] 3a8692ade26ad71a9b13da1a679d7014b81e97e20fca7a9e517759cf825e3a19
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow:/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] 4f142dc56b03025999f8b390c88e83d41a1045d698edf19edf73a12d5258e4df
[INFO] running `"docker" "start" "-a" "4f142dc56b03025999f8b390c88e83d41a1045d698edf19edf73a12d5258e4df"`
[INFO] [stderr]    Compiling defcon26-pow v0.1.1 (/opt/crater/workdir)
[INFO] [stderr] warning: unused return value of `std::iter::Iterator::collect` that must be used
[INFO] [stderr]   --> src/main.rs:82:5
[INFO] [stderr]    |
[INFO] [stderr] 82 | /     children.into_iter()
[INFO] [stderr] 83 | |         .map(|c| c.join().unwrap())
[INFO] [stderr] 84 | |         .collect::<Vec<_>>();
[INFO] [stderr]    | |_____________________________^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]    = note: if you really need to exhaust the iterator, consider `.for_each(drop)` instead
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.33s
[INFO] running `"docker" "inspect" "4f142dc56b03025999f8b390c88e83d41a1045d698edf19edf73a12d5258e4df"`
[INFO] running `"docker" "rm" "-f" "4f142dc56b03025999f8b390c88e83d41a1045d698edf19edf73a12d5258e4df"`
[INFO] [stdout] 4f142dc56b03025999f8b390c88e83d41a1045d698edf19edf73a12d5258e4df
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-1/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/kpcyrd/defcon26-pow:/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] 7ad8bdbb8d27288190eedf94c31d6937d17a677abc3ac831c0158f9fe273dc43
[INFO] running `"docker" "start" "-a" "7ad8bdbb8d27288190eedf94c31d6937d17a677abc3ac831c0158f9fe273dc43"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.09s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/defcon26_pow-400f268392f85d87
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_check_pow_valid ... ok
[INFO] [stdout] test tests::test_pow_hash ... ok
[INFO] [stdout] test tests::test_check_pow_invalid ... ok
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 3 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "7ad8bdbb8d27288190eedf94c31d6937d17a677abc3ac831c0158f9fe273dc43"`
[INFO] running `"docker" "rm" "-f" "7ad8bdbb8d27288190eedf94c31d6937d17a677abc3ac831c0158f9fe273dc43"`
[INFO] [stdout] 7ad8bdbb8d27288190eedf94c31d6937d17a677abc3ac831c0158f9fe273dc43