Dec 13 21:39:14.936 INFO testing dennisfurrer/RustBlockchain against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 13 21:39:14.936 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-2/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +bd47d6825bf4090517549d33cfef10d3300b4a75-alt build --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 21:39:15.190 INFO [stdout] 4e77d35aca3eb8d597974326d93d171c8c7eab50de9c54ff474057d7133c8633
Dec 13 21:39:15.192 INFO running `"docker" "start" "-a" "4e77d35aca3eb8d597974326d93d171c8c7eab50de9c54ff474057d7133c8633"`
Dec 13 21:39:15.626 INFO [stderr] usermod: no changes
Dec 13 21:39:15.735 INFO [stderr]    Compiling blockchain v0.1.0 (/source)
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:18:5
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 18 |     io::stdout().flush();
Dec 13 21:39:17.029 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:19:5
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 19 |     io::stdin().read_line(&mut miner_address);
Dec 13 21:39:17.029 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:21:5
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 21 |     io::stdout().flush();
Dec 13 21:39:17.029 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:22:5
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 22 |     io::stdin().read_line(&mut difficulty);
Dec 13 21:39:17.029 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:38:9
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 38 |         io::stdout().flush();
Dec 13 21:39:17.029 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:40:9
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 40 |         io::stdin().read_line(&mut choice);
Dec 13 21:39:17.029 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:71:17
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 71 |                 io::stdout().flush();
Dec 13 21:39:17.029 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:72:17
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 72 |                 io::stdin().read_line(&mut from);
Dec 13 21:39:17.029 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:74:17
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 74 |                 io::stdout().flush();
Dec 13 21:39:17.029 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.029 INFO [stderr] 
Dec 13 21:39:17.029 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.029 INFO [stderr]   --> src/main.rs:75:17
Dec 13 21:39:17.029 INFO [stderr]    |
Dec 13 21:39:17.029 INFO [stderr] 75 |                 io::stdin().read_line(&mut to);
Dec 13 21:39:17.029 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.030 INFO [stderr]    |
Dec 13 21:39:17.030 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.030 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]   --> src/main.rs:77:17
Dec 13 21:39:17.039 INFO [stderr]    |
Dec 13 21:39:17.039 INFO [stderr] 77 |                 io::stdout().flush();
Dec 13 21:39:17.039 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]    |
Dec 13 21:39:17.039 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]   --> src/main.rs:78:17
Dec 13 21:39:17.039 INFO [stderr]    |
Dec 13 21:39:17.039 INFO [stderr] 78 |                 io::stdin().read_line(&mut amount);
Dec 13 21:39:17.039 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]    |
Dec 13 21:39:17.039 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]    --> src/main.rs:106:17
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr] 106 |                 io::stdout().flush();
Dec 13 21:39:17.039 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]    --> src/main.rs:107:17
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr] 107 |                 io::stdin().read_line(&mut new_diff);
Dec 13 21:39:17.039 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]    --> src/main.rs:119:17
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr] 119 |                 io::stdout().flush();
Dec 13 21:39:17.039 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:17.039 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:17.039 INFO [stderr]    --> src/main.rs:120:17
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr] 120 |                 io::stdin().read_line(&mut new_reward);
Dec 13 21:39:17.039 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:17.039 INFO [stderr]     |
Dec 13 21:39:17.039 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:17.039 INFO [stderr] 
Dec 13 21:39:18.219 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.57s
Dec 13 21:39:18.221 INFO [stderr] su: No module specific data is present
Dec 13 21:39:19.101 INFO running `"docker" "inspect" "4e77d35aca3eb8d597974326d93d171c8c7eab50de9c54ff474057d7133c8633"`
Dec 13 21:39:19.489 INFO running `"docker" "rm" "-f" "4e77d35aca3eb8d597974326d93d171c8c7eab50de9c54ff474057d7133c8633"`
Dec 13 21:39:19.739 INFO [stdout] 4e77d35aca3eb8d597974326d93d171c8c7eab50de9c54ff474057d7133c8633
Dec 13 21:39:19.743 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-2/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +bd47d6825bf4090517549d33cfef10d3300b4a75-alt test --frozen --no-run" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 21:39:20.220 INFO [stdout] c84441ea9d41f72696a30471bb2f9f9ccc70fdc98961f40ceb4054400a4d1071
Dec 13 21:39:20.223 INFO running `"docker" "start" "-a" "c84441ea9d41f72696a30471bb2f9f9ccc70fdc98961f40ceb4054400a4d1071"`
Dec 13 21:39:21.235 INFO [stderr] usermod: no changes
Dec 13 21:39:21.336 INFO [stderr]    Compiling blockchain v0.1.0 (/source)
Dec 13 21:39:22.209 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.211 INFO [stderr]   --> src/main.rs:18:5
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr] 18 |     io::stdout().flush();
Dec 13 21:39:22.211 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 13 21:39:22.211 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.211 INFO [stderr] 
Dec 13 21:39:22.211 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.211 INFO [stderr]   --> src/main.rs:19:5
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr] 19 |     io::stdin().read_line(&mut miner_address);
Dec 13 21:39:22.211 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.211 INFO [stderr] 
Dec 13 21:39:22.211 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.211 INFO [stderr]   --> src/main.rs:21:5
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr] 21 |     io::stdout().flush();
Dec 13 21:39:22.211 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.211 INFO [stderr] 
Dec 13 21:39:22.211 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.211 INFO [stderr]   --> src/main.rs:22:5
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr] 22 |     io::stdin().read_line(&mut difficulty);
Dec 13 21:39:22.211 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.211 INFO [stderr] 
Dec 13 21:39:22.211 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.211 INFO [stderr]   --> src/main.rs:38:9
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr] 38 |         io::stdout().flush();
Dec 13 21:39:22.211 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.211 INFO [stderr]    |
Dec 13 21:39:22.211 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.211 INFO [stderr] 
Dec 13 21:39:22.211 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:40:9
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr] 40 |         io::stdin().read_line(&mut choice);
Dec 13 21:39:22.212 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.212 INFO [stderr] 
Dec 13 21:39:22.212 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:71:17
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr] 71 |                 io::stdout().flush();
Dec 13 21:39:22.212 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.212 INFO [stderr] 
Dec 13 21:39:22.212 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:72:17
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr] 72 |                 io::stdin().read_line(&mut from);
Dec 13 21:39:22.212 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.212 INFO [stderr] 
Dec 13 21:39:22.212 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:74:17
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr] 74 |                 io::stdout().flush();
Dec 13 21:39:22.212 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.212 INFO [stderr] 
Dec 13 21:39:22.212 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:75:17
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr] 75 |                 io::stdin().read_line(&mut to);
Dec 13 21:39:22.212 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.212 INFO [stderr]    |
Dec 13 21:39:22.212 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.212 INFO [stderr] 
Dec 13 21:39:22.212 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.212 INFO [stderr]   --> src/main.rs:77:17
Dec 13 21:39:22.213 INFO [stderr]    |
Dec 13 21:39:22.213 INFO [stderr] 77 |                 io::stdout().flush();
Dec 13 21:39:22.213 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.213 INFO [stderr]    |
Dec 13 21:39:22.213 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.213 INFO [stderr] 
Dec 13 21:39:22.213 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.213 INFO [stderr]   --> src/main.rs:78:17
Dec 13 21:39:22.213 INFO [stderr]    |
Dec 13 21:39:22.213 INFO [stderr] 78 |                 io::stdin().read_line(&mut amount);
Dec 13 21:39:22.213 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.213 INFO [stderr]    |
Dec 13 21:39:22.213 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.213 INFO [stderr] 
Dec 13 21:39:22.213 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.213 INFO [stderr]    --> src/main.rs:106:17
Dec 13 21:39:22.213 INFO [stderr]     |
Dec 13 21:39:22.213 INFO [stderr] 106 |                 io::stdout().flush();
Dec 13 21:39:22.213 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.214 INFO [stderr] 
Dec 13 21:39:22.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.214 INFO [stderr]    --> src/main.rs:107:17
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr] 107 |                 io::stdin().read_line(&mut new_diff);
Dec 13 21:39:22.214 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.214 INFO [stderr] 
Dec 13 21:39:22.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.214 INFO [stderr]    --> src/main.rs:119:17
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr] 119 |                 io::stdout().flush();
Dec 13 21:39:22.214 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.214 INFO [stderr] 
Dec 13 21:39:22.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 21:39:22.214 INFO [stderr]    --> src/main.rs:120:17
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr] 120 |                 io::stdin().read_line(&mut new_reward);
Dec 13 21:39:22.214 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 21:39:22.214 INFO [stderr]     |
Dec 13 21:39:22.214 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 21:39:22.214 INFO [stderr] 
Dec 13 21:39:22.611 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.36s
Dec 13 21:39:22.616 INFO [stderr] su: No module specific data is present
Dec 13 21:39:23.152 INFO running `"docker" "inspect" "c84441ea9d41f72696a30471bb2f9f9ccc70fdc98961f40ceb4054400a4d1071"`
Dec 13 21:39:23.359 INFO running `"docker" "rm" "-f" "c84441ea9d41f72696a30471bb2f9f9ccc70fdc98961f40ceb4054400a4d1071"`
Dec 13 21:39:23.575 INFO [stdout] c84441ea9d41f72696a30471bb2f9f9ccc70fdc98961f40ceb4054400a4d1071
Dec 13 21:39:23.577 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-2/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-2/pr-56550/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/source:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/source" "-e" "USER_ID=1000" "-e" "CMD=cargo +bd47d6825bf4090517549d33cfef10d3300b4a75-alt test --frozen" "-e" "CARGO_TARGET_DIR=/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/cargo-home" "-e" "RUSTUP_HOME=/rustup-home" "-m" "1536M" "--network" "none" "crater"`
Dec 13 21:39:23.959 INFO [stdout] db44366465f90837a83fa6fc992e2da4fde43af463091717e00ee35b446f69b4
Dec 13 21:39:23.964 INFO running `"docker" "start" "-a" "db44366465f90837a83fa6fc992e2da4fde43af463091717e00ee35b446f69b4"`
Dec 13 21:39:24.375 INFO [stderr] usermod: no changes
Dec 13 21:39:24.434 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
Dec 13 21:39:24.450 INFO [stderr]      Running /target/debug/deps/blockchain-03ef7cbd8f9a7b8a
Dec 13 21:39:24.454 INFO [stdout] 
Dec 13 21:39:24.454 INFO [stdout] running 0 tests
Dec 13 21:39:24.454 INFO [stdout] 
Dec 13 21:39:24.454 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 13 21:39:24.454 INFO [stdout] 
Dec 13 21:39:24.457 INFO [stderr] su: No module specific data is present
Dec 13 21:39:24.789 INFO running `"docker" "inspect" "db44366465f90837a83fa6fc992e2da4fde43af463091717e00ee35b446f69b4"`
Dec 13 21:39:24.993 INFO running `"docker" "rm" "-f" "db44366465f90837a83fa6fc992e2da4fde43af463091717e00ee35b446f69b4"`
Dec 13 21:39:25.205 INFO [stdout] db44366465f90837a83fa6fc992e2da4fde43af463091717e00ee35b446f69b4