Dec 05 21:23:11.338 INFO testing iThinkyouknow/rust-blockchain against master#906deae0790bd18681b937fe9a141a3c26cf1855 for pr-56514
Dec 05 21:23:11.338 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-4/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 05 21:23:11.910 INFO [stdout] 20a4407dadd2165115a553197c7599478e42097b18a6f11d2fa8e583bbdefc60
Dec 05 21:23:11.912 INFO running `"docker" "start" "-a" "20a4407dadd2165115a553197c7599478e42097b18a6f11d2fa8e583bbdefc60"`
Dec 05 21:23:13.870 INFO [stderr] usermod: no changes
Dec 05 21:23:14.000 INFO [stderr]    Compiling blockchain v0.1.0 (/source)
Dec 05 21:23:15.213 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.213 INFO [stderr]   --> src/main.rs:17:5
Dec 05 21:23:15.213 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr] 17 |     io::stdout().flush();
Dec 05 21:23:15.214 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.214 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 21:23:15.214 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.214 INFO [stderr] 
Dec 05 21:23:15.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.214 INFO [stderr]   --> src/main.rs:18:5
Dec 05 21:23:15.214 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr] 18 |     io::stdin().read_line(&mut miner_addr);
Dec 05 21:23:15.214 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.214 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.214 INFO [stderr] 
Dec 05 21:23:15.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.214 INFO [stderr]   --> src/main.rs:21:5
Dec 05 21:23:15.214 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr] 21 |     io::stdout().flush();
Dec 05 21:23:15.214 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.214 INFO [stderr]    |
Dec 05 21:23:15.214 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.214 INFO [stderr] 
Dec 05 21:23:15.214 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.214 INFO [stderr]   --> src/main.rs:22:5
Dec 05 21:23:15.216 INFO [stderr]    |
Dec 05 21:23:15.216 INFO [stderr] 22 |     io::stdin().read_line(&mut difficulty);
Dec 05 21:23:15.216 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.216 INFO [stderr]    |
Dec 05 21:23:15.216 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.216 INFO [stderr] 
Dec 05 21:23:15.216 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.216 INFO [stderr]   --> src/main.rs:39:9
Dec 05 21:23:15.216 INFO [stderr]    |
Dec 05 21:23:15.216 INFO [stderr] 39 |         io::stdout().flush();
Dec 05 21:23:15.216 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.216 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.220 INFO [stderr] 
Dec 05 21:23:15.220 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.220 INFO [stderr]   --> src/main.rs:41:9
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr] 41 |         io::stdin().read_line(&mut choice);
Dec 05 21:23:15.220 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.220 INFO [stderr] 
Dec 05 21:23:15.220 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.220 INFO [stderr]   --> src/main.rs:55:17
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr] 55 |                 io::stdout().flush();
Dec 05 21:23:15.220 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.220 INFO [stderr] 
Dec 05 21:23:15.220 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.220 INFO [stderr]   --> src/main.rs:56:17
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr] 56 |                 io::stdin().read_line(&mut sender);
Dec 05 21:23:15.220 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.220 INFO [stderr]    |
Dec 05 21:23:15.220 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.220 INFO [stderr] 
Dec 05 21:23:15.220 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.224 INFO [stderr]   --> src/main.rs:58:17
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr] 58 |                 io::stdout().flush();
Dec 05 21:23:15.224 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.224 INFO [stderr] 
Dec 05 21:23:15.224 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.224 INFO [stderr]   --> src/main.rs:59:17
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr] 59 |                 io::stdin().read_line(&mut receiver);
Dec 05 21:23:15.224 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.224 INFO [stderr] 
Dec 05 21:23:15.224 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.224 INFO [stderr]   --> src/main.rs:62:17
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr] 62 |                 io::stdout().flush();
Dec 05 21:23:15.224 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.224 INFO [stderr] 
Dec 05 21:23:15.224 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.224 INFO [stderr]   --> src/main.rs:63:17
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr] 63 |                 io::stdin().read_line(&mut amount);
Dec 05 21:23:15.224 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.224 INFO [stderr] 
Dec 05 21:23:15.224 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.224 INFO [stderr]   --> src/main.rs:87:17
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr] 87 |                 io::stdout().flush();
Dec 05 21:23:15.224 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.224 INFO [stderr]    |
Dec 05 21:23:15.224 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.224 INFO [stderr] 
Dec 05 21:23:15.228 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.228 INFO [stderr]   --> src/main.rs:88:17
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr] 88 |                 io::stdin().read_line(&mut new_diff);
Dec 05 21:23:15.228 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.228 INFO [stderr] 
Dec 05 21:23:15.228 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.228 INFO [stderr]   --> src/main.rs:98:17
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr] 98 |                 io::stdout().flush();
Dec 05 21:23:15.228 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.228 INFO [stderr] 
Dec 05 21:23:15.228 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:15.228 INFO [stderr]   --> src/main.rs:99:17
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr] 99 |                 io::stdin().read_line(&mut new_reward);
Dec 05 21:23:15.228 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:15.228 INFO [stderr]    |
Dec 05 21:23:15.228 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:15.228 INFO [stderr] 
Dec 05 21:23:16.528 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 2.62s
Dec 05 21:23:16.537 INFO [stderr] su: No module specific data is present
Dec 05 21:23:17.331 INFO running `"docker" "inspect" "20a4407dadd2165115a553197c7599478e42097b18a6f11d2fa8e583bbdefc60"`
Dec 05 21:23:17.696 INFO running `"docker" "rm" "-f" "20a4407dadd2165115a553197c7599478e42097b18a6f11d2fa8e583bbdefc60"`
Dec 05 21:23:18.015 INFO [stdout] 20a4407dadd2165115a553197c7599478e42097b18a6f11d2fa8e583bbdefc60
Dec 05 21:23:18.018 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-4/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 05 21:23:18.510 INFO [stdout] 94e5cc9acba91611f6c3b6905aac36398a681dd6449569ee417a54f7abe36477
Dec 05 21:23:18.512 INFO running `"docker" "start" "-a" "94e5cc9acba91611f6c3b6905aac36398a681dd6449569ee417a54f7abe36477"`
Dec 05 21:23:20.087 INFO [stderr] usermod: no changes
Dec 05 21:23:20.216 INFO [stderr]    Compiling blockchain v0.1.0 (/source)
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:17:5
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 17 |     io::stdout().flush();
Dec 05 21:23:21.129 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:18:5
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 18 |     io::stdin().read_line(&mut miner_addr);
Dec 05 21:23:21.129 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:21:5
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 21 |     io::stdout().flush();
Dec 05 21:23:21.129 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:22:5
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 22 |     io::stdin().read_line(&mut difficulty);
Dec 05 21:23:21.129 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:39:9
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 39 |         io::stdout().flush();
Dec 05 21:23:21.129 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:41:9
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 41 |         io::stdin().read_line(&mut choice);
Dec 05 21:23:21.129 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:55:17
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 55 |                 io::stdout().flush();
Dec 05 21:23:21.129 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:56:17
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 56 |                 io::stdin().read_line(&mut sender);
Dec 05 21:23:21.129 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:58:17
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 58 |                 io::stdout().flush();
Dec 05 21:23:21.129 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.129 INFO [stderr] 
Dec 05 21:23:21.129 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.129 INFO [stderr]   --> src/main.rs:59:17
Dec 05 21:23:21.129 INFO [stderr]    |
Dec 05 21:23:21.129 INFO [stderr] 59 |                 io::stdin().read_line(&mut receiver);
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:62:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 62 |                 io::stdout().flush();
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:63:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 63 |                 io::stdin().read_line(&mut amount);
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:87:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 87 |                 io::stdout().flush();
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:88:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 88 |                 io::stdin().read_line(&mut new_diff);
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:98:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 98 |                 io::stdout().flush();
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.130 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 05 21:23:21.130 INFO [stderr]   --> src/main.rs:99:17
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr] 99 |                 io::stdin().read_line(&mut new_reward);
Dec 05 21:23:21.130 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 05 21:23:21.130 INFO [stderr]    |
Dec 05 21:23:21.130 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 05 21:23:21.130 INFO [stderr] 
Dec 05 21:23:21.524 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.41s
Dec 05 21:23:21.528 INFO [stderr] su: No module specific data is present
Dec 05 21:23:22.566 INFO running `"docker" "inspect" "94e5cc9acba91611f6c3b6905aac36398a681dd6449569ee417a54f7abe36477"`
Dec 05 21:23:22.924 INFO running `"docker" "rm" "-f" "94e5cc9acba91611f6c3b6905aac36398a681dd6449569ee417a54f7abe36477"`
Dec 05 21:23:23.232 INFO [stdout] 94e5cc9acba91611f6c3b6905aac36398a681dd6449569ee417a54f7abe36477
Dec 05 21:23:23.240 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56514/worker-4/master#906deae0790bd18681b937fe9a141a3c26cf1855:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-4/pr-56514/master#906deae0790bd18681b937fe9a141a3c26cf1855:/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 +906deae0790bd18681b937fe9a141a3c26cf1855-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 05 21:23:23.701 INFO [stdout] af8ba5c16a22a4a9880dd590d3972a0205ff65b5090e95b5745c52ac23f8b11a
Dec 05 21:23:23.703 INFO running `"docker" "start" "-a" "af8ba5c16a22a4a9880dd590d3972a0205ff65b5090e95b5745c52ac23f8b11a"`
Dec 05 21:23:25.648 INFO [stderr] usermod: no changes
Dec 05 21:23:25.749 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
Dec 05 21:23:25.772 INFO [stderr]      Running /target/debug/deps/blockchain-8cc070de74da9b5b
Dec 05 21:23:25.780 INFO [stdout] 
Dec 05 21:23:25.780 INFO [stdout] running 0 tests
Dec 05 21:23:25.780 INFO [stdout] 
Dec 05 21:23:25.780 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 05 21:23:25.780 INFO [stdout] 
Dec 05 21:23:25.781 INFO [stderr] su: No module specific data is present
Dec 05 21:23:26.770 INFO running `"docker" "inspect" "af8ba5c16a22a4a9880dd590d3972a0205ff65b5090e95b5745c52ac23f8b11a"`
Dec 05 21:23:27.172 INFO running `"docker" "rm" "-f" "af8ba5c16a22a4a9880dd590d3972a0205ff65b5090e95b5745c52ac23f8b11a"`
Dec 05 21:23:27.556 INFO [stdout] af8ba5c16a22a4a9880dd590d3972a0205ff65b5090e95b5745c52ac23f8b11a