[INFO] updating cached repository https://github.com/kpcyrd/defcon26-pow
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d17edcaf67cb2a8455e7797f3a373b9c250a3cee
[INFO] testing kpcyrd/defcon26-pow against try#41997647ba6a77908f6ef64401414feb00bccf16 for pr-71274
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fkpcyrd%2Fdefcon26-pow" "/workspace/builds/worker-0/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/kpcyrd/defcon26-pow on toolchain 41997647ba6a77908f6ef64401414feb00bccf16
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/kpcyrd/defcon26-pow
[INFO] finished tweaking git repo https://github.com/kpcyrd/defcon26-pow
[INFO] tweaked toml for git repo https://github.com/kpcyrd/defcon26-pow written to /workspace/builds/worker-0/source/Cargo.toml
[INFO] crate git repo https://github.com/kpcyrd/defcon26-pow already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "build" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 8f5d5e4014935a9a2c24a926d7cd6270314a7f6d440f369bba53f870ca073303
[INFO] running `"docker" "start" "-a" "8f5d5e4014935a9a2c24a926d7cd6270314a7f6d440f369bba53f870ca073303"`
[INFO] [stderr]    Compiling num-traits v0.2.4
[INFO] [stderr]    Compiling fake-simd v0.1.2
[INFO] [stderr]    Compiling rustc-serialize v0.3.24
[INFO] [stderr]    Compiling rand v0.4.2
[INFO] [stderr]    Compiling num_cpus v1.8.0
[INFO] [stderr]    Compiling sha2 v0.7.1
[INFO] [stderr]    Compiling num-integer v0.1.38
[INFO] [stderr]    Compiling num-bigint v0.1.43
[INFO] [stderr]    Compiling defcon26-pow v0.1.1 (/opt/rustwide/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] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.26s
[INFO] running `"docker" "inspect" "8f5d5e4014935a9a2c24a926d7cd6270314a7f6d440f369bba53f870ca073303"`
[INFO] running `"docker" "rm" "-f" "8f5d5e4014935a9a2c24a926d7cd6270314a7f6d440f369bba53f870ca073303"`
[INFO] [stdout] 8f5d5e4014935a9a2c24a926d7cd6270314a7f6d440f369bba53f870ca073303
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen" "--no-run"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 68c7eb316894f760ec1d77cad3b88af4f83bd21b83d61503a69240ee2d1f8cbc
[INFO] running `"docker" "start" "-a" "68c7eb316894f760ec1d77cad3b88af4f83bd21b83d61503a69240ee2d1f8cbc"`
[INFO] [stderr]    Compiling defcon26-pow v0.1.1 (/opt/rustwide/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] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 1.32s
[INFO] running `"docker" "inspect" "68c7eb316894f760ec1d77cad3b88af4f83bd21b83d61503a69240ee2d1f8cbc"`
[INFO] running `"docker" "rm" "-f" "68c7eb316894f760ec1d77cad3b88af4f83bd21b83d61503a69240ee2d1f8cbc"`
[INFO] [stdout] 68c7eb316894f760ec1d77cad3b88af4f83bd21b83d61503a69240ee2d1f8cbc
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+41997647ba6a77908f6ef64401414feb00bccf16" "test" "--frozen"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 6f91349812c0f4047c44a48966d56f4adfd67042c774df92941ac1bcaf9bc879
[INFO] running `"docker" "start" "-a" "6f91349812c0f4047c44a48966d56f4adfd67042c774df92941ac1bcaf9bc879"`
[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] warning: 1 warning emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished test [unoptimized + debuginfo] target(s) in 0.14s
[INFO] [stderr]      Running /opt/rustwide/target/debug/deps/defcon26_pow-94a9548b72939952
[INFO] [stdout] 
[INFO] [stdout] running 3 tests
[INFO] [stdout] test tests::test_check_pow_invalid ... ok
[INFO] [stdout] test tests::test_pow_hash ... ok
[INFO] [stdout] test tests::test_check_pow_valid ... 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" "6f91349812c0f4047c44a48966d56f4adfd67042c774df92941ac1bcaf9bc879"`
[INFO] running `"docker" "rm" "-f" "6f91349812c0f4047c44a48966d56f4adfd67042c774df92941ac1bcaf9bc879"`
[INFO] [stdout] 6f91349812c0f4047c44a48966d56f4adfd67042c774df92941ac1bcaf9bc879