[INFO] updating cached repository OffBlockway/OffBlockwayMiningClient
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/OffBlockway/OffBlockwayMiningClient
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/OffBlockway/OffBlockwayMiningClient" "work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/OffBlockway/OffBlockwayMiningClient" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/OffBlockway/OffBlockwayMiningClient"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/OffBlockway/OffBlockwayMiningClient'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 6fc1cfb70b1656b364916575b4405331ae0f6a8f
[INFO] sha for GitHub repo OffBlockway/OffBlockwayMiningClient: 6fc1cfb70b1656b364916575b4405331ae0f6a8f
[INFO] validating manifest of OffBlockway/OffBlockwayMiningClient 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 OffBlockway/OffBlockwayMiningClient 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 OffBlockway/OffBlockwayMiningClient
[INFO] finished frobbing OffBlockway/OffBlockwayMiningClient
[INFO] frobbed toml for OffBlockway/OffBlockwayMiningClient written to work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient/Cargo.toml
[INFO] started frobbing OffBlockway/OffBlockwayMiningClient
[INFO] finished frobbing OffBlockway/OffBlockwayMiningClient
[INFO] frobbed toml for OffBlockway/OffBlockwayMiningClient written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/OffBlockway/OffBlockwayMiningClient/Cargo.toml
[INFO] crate OffBlockway/OffBlockwayMiningClient 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 OffBlockway/OffBlockwayMiningClient 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-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient:/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] d5d4c48683ba26278f7a380feaa5b2ee92aaebd1bdf29dd82514ab171c7babed
[INFO] running `"docker" "start" "-a" "d5d4c48683ba26278f7a380feaa5b2ee92aaebd1bdf29dd82514ab171c7babed"`
[INFO] [stderr]    Compiling num-integer v0.1.35
[INFO] [stderr]    Compiling serde_json v1.0.8
[INFO] [stderr]    Compiling generic-array v0.8.3
[INFO] [stderr]    Compiling serde_derive_internals v0.18.0
[INFO] [stderr]    Compiling generic-array v0.9.0
[INFO] [stderr]    Compiling num-iter v0.1.34
[INFO] [stderr]    Compiling digest v0.6.2
[INFO] [stderr]    Compiling block-buffer v0.2.0
[INFO] [stderr]    Compiling num v0.1.41
[INFO] [stderr]    Compiling sha3 v0.6.0
[INFO] [stderr]    Compiling chrono v0.4.0
[INFO] [stderr]    Compiling serde_derive v1.0.24
[INFO] [stderr]    Compiling off_blockway v0.0.8
[INFO] [stderr]    Compiling mining_client v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         file.read_to_string( &mut buffer );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.99s
[INFO] running `"docker" "inspect" "d5d4c48683ba26278f7a380feaa5b2ee92aaebd1bdf29dd82514ab171c7babed"`
[INFO] running `"docker" "rm" "-f" "d5d4c48683ba26278f7a380feaa5b2ee92aaebd1bdf29dd82514ab171c7babed"`
[INFO] [stdout] d5d4c48683ba26278f7a380feaa5b2ee92aaebd1bdf29dd82514ab171c7babed
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient:/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] 096bfabd273d40ddb31843a4b8c7f4014e49f44a16db9c385fe73e7d1e1c437d
[INFO] running `"docker" "start" "-a" "096bfabd273d40ddb31843a4b8c7f4014e49f44a16db9c385fe73e7d1e1c437d"`
[INFO] [stderr]    Compiling mining_client v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: unused `std::result::Result` that must be used
[INFO] [stderr]    --> src/main.rs:104:9
[INFO] [stderr]     |
[INFO] [stderr] 104 |         file.read_to_string( &mut buffer );
[INFO] [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(unused_must_use)] on by default
[INFO] [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `"docker" "inspect" "096bfabd273d40ddb31843a4b8c7f4014e49f44a16db9c385fe73e7d1e1c437d"`
[INFO] running `"docker" "rm" "-f" "096bfabd273d40ddb31843a4b8c7f4014e49f44a16db9c385fe73e7d1e1c437d"`
[INFO] [stdout] 096bfabd273d40ddb31843a4b8c7f4014e49f44a16db9c385fe73e7d1e1c437d
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-3/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/gh/OffBlockway/OffBlockwayMiningClient:/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] b4fb50deba57606dd76ace6b1219c09a3922a3654b7bc72fedf08d15ab449866
[INFO] running `"docker" "start" "-a" "b4fb50deba57606dd76ace6b1219c09a3922a3654b7bc72fedf08d15ab449866"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.02s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/mining_client-008163990e73f9cb
[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" "b4fb50deba57606dd76ace6b1219c09a3922a3654b7bc72fedf08d15ab449866"`
[INFO] running `"docker" "rm" "-f" "b4fb50deba57606dd76ace6b1219c09a3922a3654b7bc72fedf08d15ab449866"`
[INFO] [stdout] b4fb50deba57606dd76ace6b1219c09a3922a3654b7bc72fedf08d15ab449866