Dec 17 20:45:31.222 INFO checking lezwon/Blockchain-from-Scratch against master#96d1334e567237b1507cd277938e7ae2de75ff51 for pr-54252
Dec 17 20:45:31.223 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-1/master#96d1334e567237b1507cd277938e7ae2de75ff51:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/master#96d1334e567237b1507cd277938e7ae2de75ff51/gh/lezwon/Blockchain-from-Scratch:/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=forbid" "-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" "+96d1334e567237b1507cd277938e7ae2de75ff51-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 20:45:31.722 INFO [stdout] 6ac90b2344bcf4315eea5576ecae4610e6ae6530fa330b8c87f796d2cd1f204c
Dec 17 20:45:31.724 INFO running `"docker" "start" "-a" "6ac90b2344bcf4315eea5576ecae4610e6ae6530fa330b8c87f796d2cd1f204c"`
Dec 17 20:45:33.360 INFO [stderr]     Checking serde v1.0.21
Dec 17 20:45:33.360 INFO [stderr]     Checking generic-array v0.9.0
Dec 17 20:45:33.360 INFO [stderr]    Compiling serde_derive v1.0.21
Dec 17 20:45:34.260 INFO [stderr]     Checking digest v0.7.2
Dec 17 20:45:34.777 INFO [stderr]     Checking sha2 v0.7.0
Dec 17 20:45:45.748 INFO [stderr]     Checking serde_json v1.0.6
Dec 17 20:45:48.044 INFO [stderr]     Checking blockchain-rust v0.1.0 (/opt/crater/workdir)
Dec 17 20:45:48.690 INFO [stderr] warning: variable does not need to be mutable
Dec 17 20:45:48.690 INFO [stderr]   --> src/main.rs:94:8
Dec 17 20:45:48.690 INFO [stderr]    |
Dec 17 20:45:48.690 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 17 20:45:48.691 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 17 20:45:48.691 INFO [stderr]    |                 |
Dec 17 20:45:48.692 INFO [stderr]    |                 help: remove this `mut`
Dec 17 20:45:48.692 INFO [stderr]    |
Dec 17 20:45:48.692 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 20:45:48.696 INFO [stderr] 
Dec 17 20:45:48.725 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.725 INFO [stderr]    --> src/main.rs:210:2
Dec 17 20:45:48.725 INFO [stderr]     |
Dec 17 20:45:48.725 INFO [stderr] 210 |     io::stdout().flush();
Dec 17 20:45:48.725 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.726 INFO [stderr]     |
Dec 17 20:45:48.726 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 20:45:48.726 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.726 INFO [stderr] 
Dec 17 20:45:48.726 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.726 INFO [stderr]    --> src/main.rs:211:2
Dec 17 20:45:48.726 INFO [stderr]     |
Dec 17 20:45:48.726 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 17 20:45:48.726 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.726 INFO [stderr]     |
Dec 17 20:45:48.726 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.726 INFO [stderr] 
Dec 17 20:45:48.727 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.727 INFO [stderr]    --> src/main.rs:213:2
Dec 17 20:45:48.727 INFO [stderr]     |
Dec 17 20:45:48.727 INFO [stderr] 213 |     io::stdout().flush();
Dec 17 20:45:48.727 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.727 INFO [stderr]     |
Dec 17 20:45:48.727 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.727 INFO [stderr] 
Dec 17 20:45:48.727 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.727 INFO [stderr]    --> src/main.rs:214:2
Dec 17 20:45:48.727 INFO [stderr]     |
Dec 17 20:45:48.727 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 17 20:45:48.728 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.728 INFO [stderr]     |
Dec 17 20:45:48.728 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.728 INFO [stderr] 
Dec 17 20:45:48.728 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.728 INFO [stderr]    --> src/main.rs:229:3
Dec 17 20:45:48.728 INFO [stderr]     |
Dec 17 20:45:48.728 INFO [stderr] 229 |         io::stdout().flush();
Dec 17 20:45:48.728 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.728 INFO [stderr]     |
Dec 17 20:45:48.728 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.728 INFO [stderr] 
Dec 17 20:45:48.728 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.728 INFO [stderr]    --> src/main.rs:231:3
Dec 17 20:45:48.728 INFO [stderr]     |
Dec 17 20:45:48.728 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 17 20:45:48.728 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.728 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.729 INFO [stderr] 
Dec 17 20:45:48.729 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.729 INFO [stderr]    --> src/main.rs:247:5
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr] 247 |                 io::stdout().flush();
Dec 17 20:45:48.729 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.729 INFO [stderr] 
Dec 17 20:45:48.729 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.729 INFO [stderr]    --> src/main.rs:248:5
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 17 20:45:48.729 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.729 INFO [stderr] 
Dec 17 20:45:48.729 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.729 INFO [stderr]    --> src/main.rs:250:5
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.729 INFO [stderr] 250 |                 io::stdout().flush();
Dec 17 20:45:48.729 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.729 INFO [stderr]     |
Dec 17 20:45:48.730 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.730 INFO [stderr] 
Dec 17 20:45:48.730 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.730 INFO [stderr]    --> src/main.rs:251:5
Dec 17 20:45:48.730 INFO [stderr]     |
Dec 17 20:45:48.730 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 17 20:45:48.730 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.730 INFO [stderr]     |
Dec 17 20:45:48.730 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.730 INFO [stderr] 
Dec 17 20:45:48.730 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.730 INFO [stderr]    --> src/main.rs:253:5
Dec 17 20:45:48.730 INFO [stderr]     |
Dec 17 20:45:48.730 INFO [stderr] 253 |                 io::stdout().flush();
Dec 17 20:45:48.730 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.731 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.731 INFO [stderr] 
Dec 17 20:45:48.731 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.731 INFO [stderr]    --> src/main.rs:254:5
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.731 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 17 20:45:48.731 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.731 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.731 INFO [stderr] 
Dec 17 20:45:48.731 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.731 INFO [stderr]    --> src/main.rs:274:5
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.731 INFO [stderr] 274 |                 io::stdout().flush();
Dec 17 20:45:48.731 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.731 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.731 INFO [stderr] 
Dec 17 20:45:48.731 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.731 INFO [stderr]    --> src/main.rs:275:5
Dec 17 20:45:48.731 INFO [stderr]     |
Dec 17 20:45:48.732 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 17 20:45:48.732 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.732 INFO [stderr]     |
Dec 17 20:45:48.732 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.732 INFO [stderr] 
Dec 17 20:45:48.732 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.732 INFO [stderr]    --> src/main.rs:286:5
Dec 17 20:45:48.732 INFO [stderr]     |
Dec 17 20:45:48.732 INFO [stderr] 286 |                 io::stdout().flush();
Dec 17 20:45:48.732 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.732 INFO [stderr]     |
Dec 17 20:45:48.732 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.732 INFO [stderr] 
Dec 17 20:45:48.735 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.735 INFO [stderr]    --> src/main.rs:287:5
Dec 17 20:45:48.735 INFO [stderr]     |
Dec 17 20:45:48.735 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 17 20:45:48.735 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.735 INFO [stderr]     |
Dec 17 20:45:48.735 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.735 INFO [stderr] 
Dec 17 20:45:48.814 INFO [stderr] warning: variable does not need to be mutable
Dec 17 20:45:48.814 INFO [stderr]   --> src/main.rs:94:8
Dec 17 20:45:48.814 INFO [stderr]    |
Dec 17 20:45:48.814 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 17 20:45:48.814 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 17 20:45:48.814 INFO [stderr]    |                 |
Dec 17 20:45:48.815 INFO [stderr]    |                 help: remove this `mut`
Dec 17 20:45:48.815 INFO [stderr]    |
Dec 17 20:45:48.815 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 20:45:48.815 INFO [stderr] 
Dec 17 20:45:48.844 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.844 INFO [stderr]    --> src/main.rs:210:2
Dec 17 20:45:48.844 INFO [stderr]     |
Dec 17 20:45:48.844 INFO [stderr] 210 |     io::stdout().flush();
Dec 17 20:45:48.844 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.844 INFO [stderr]     |
Dec 17 20:45:48.848 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 20:45:48.848 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.848 INFO [stderr] 
Dec 17 20:45:48.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.848 INFO [stderr]    --> src/main.rs:211:2
Dec 17 20:45:48.848 INFO [stderr]     |
Dec 17 20:45:48.848 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 17 20:45:48.848 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.848 INFO [stderr]     |
Dec 17 20:45:48.848 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.848 INFO [stderr] 
Dec 17 20:45:48.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.848 INFO [stderr]    --> src/main.rs:213:2
Dec 17 20:45:48.848 INFO [stderr]     |
Dec 17 20:45:48.848 INFO [stderr] 213 |     io::stdout().flush();
Dec 17 20:45:48.848 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.848 INFO [stderr]     |
Dec 17 20:45:48.848 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.848 INFO [stderr] 
Dec 17 20:45:48.848 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.848 INFO [stderr]    --> src/main.rs:214:2
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 17 20:45:48.852 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.852 INFO [stderr] 
Dec 17 20:45:48.852 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.852 INFO [stderr]    --> src/main.rs:229:3
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 229 |         io::stdout().flush();
Dec 17 20:45:48.852 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.852 INFO [stderr] 
Dec 17 20:45:48.852 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.852 INFO [stderr]    --> src/main.rs:231:3
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 17 20:45:48.852 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.852 INFO [stderr] 
Dec 17 20:45:48.852 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.852 INFO [stderr]    --> src/main.rs:247:5
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 247 |                 io::stdout().flush();
Dec 17 20:45:48.852 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.852 INFO [stderr] 
Dec 17 20:45:48.852 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.852 INFO [stderr]    --> src/main.rs:248:5
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 17 20:45:48.852 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.852 INFO [stderr] 
Dec 17 20:45:48.852 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.852 INFO [stderr]    --> src/main.rs:250:5
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.852 INFO [stderr] 250 |                 io::stdout().flush();
Dec 17 20:45:48.852 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.852 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.856 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.856 INFO [stderr]    --> src/main.rs:251:5
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 17 20:45:48.856 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.856 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.856 INFO [stderr]    --> src/main.rs:253:5
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr] 253 |                 io::stdout().flush();
Dec 17 20:45:48.856 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.856 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.856 INFO [stderr]    --> src/main.rs:254:5
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 17 20:45:48.856 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.856 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.856 INFO [stderr]    --> src/main.rs:274:5
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr] 274 |                 io::stdout().flush();
Dec 17 20:45:48.856 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.856 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.856 INFO [stderr]    --> src/main.rs:275:5
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 17 20:45:48.856 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.856 INFO [stderr]     |
Dec 17 20:45:48.856 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.856 INFO [stderr] 
Dec 17 20:45:48.860 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.860 INFO [stderr]    --> src/main.rs:286:5
Dec 17 20:45:48.860 INFO [stderr]     |
Dec 17 20:45:48.860 INFO [stderr] 286 |                 io::stdout().flush();
Dec 17 20:45:48.860 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.860 INFO [stderr]     |
Dec 17 20:45:48.860 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.860 INFO [stderr] 
Dec 17 20:45:48.860 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:48.860 INFO [stderr]    --> src/main.rs:287:5
Dec 17 20:45:48.860 INFO [stderr]     |
Dec 17 20:45:48.860 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 17 20:45:48.860 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:48.860 INFO [stderr]     |
Dec 17 20:45:48.860 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:48.860 INFO [stderr] 
Dec 17 20:45:48.928 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 15.63s
Dec 17 20:45:49.962 INFO running `"docker" "inspect" "6ac90b2344bcf4315eea5576ecae4610e6ae6530fa330b8c87f796d2cd1f204c"`
Dec 17 20:45:50.282 INFO running `"docker" "rm" "-f" "6ac90b2344bcf4315eea5576ecae4610e6ae6530fa330b8c87f796d2cd1f204c"`
Dec 17 20:45:50.692 INFO [stdout] 6ac90b2344bcf4315eea5576ecae4610e6ae6530fa330b8c87f796d2cd1f204c