Dec 17 20:45:30.694 INFO checking lezwon/Blockchain-from-Scratch against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 20:45:30.694 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-2/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/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" "+0b8c5828f68d7b2840b81fa51239346dc97fef5a-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 17 20:45:31.216 INFO [stdout] 19cf75d1ead5150f7853193d310e0de943839a121e5bf93704947d671d769520
Dec 17 20:45:31.226 INFO running `"docker" "start" "-a" "19cf75d1ead5150f7853193d310e0de943839a121e5bf93704947d671d769520"`
Dec 17 20:45:32.724 INFO [stderr]     Checking blockchain-rust v0.1.0 (/opt/crater/workdir)
Dec 17 20:45:33.360 INFO [stderr] warning: variable does not need to be mutable
Dec 17 20:45:33.360 INFO [stderr]   --> src/main.rs:94:8
Dec 17 20:45:33.360 INFO [stderr]    |
Dec 17 20:45:33.360 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 17 20:45:33.360 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 17 20:45:33.360 INFO [stderr]    |                 |
Dec 17 20:45:33.360 INFO [stderr]    |                 help: remove this `mut`
Dec 17 20:45:33.360 INFO [stderr]    |
Dec 17 20:45:33.360 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 20:45:33.360 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:210:2
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 210 |     io::stdout().flush();
Dec 17 20:45:33.385 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 20:45:33.385 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.385 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:211:2
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 17 20:45:33.385 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.385 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:213:2
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 213 |     io::stdout().flush();
Dec 17 20:45:33.385 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.385 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:214:2
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 17 20:45:33.385 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.385 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:229:3
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 229 |         io::stdout().flush();
Dec 17 20:45:33.385 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.385 INFO [stderr] 
Dec 17 20:45:33.385 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.385 INFO [stderr]    --> src/main.rs:231:3
Dec 17 20:45:33.385 INFO [stderr]     |
Dec 17 20:45:33.385 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 17 20:45:33.386 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:247:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 247 |                 io::stdout().flush();
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:248:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:250:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 250 |                 io::stdout().flush();
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:251:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:253:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 253 |                 io::stdout().flush();
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:254:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:274:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 274 |                 io::stdout().flush();
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:275:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:286:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 286 |                 io::stdout().flush();
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.386 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.386 INFO [stderr]    --> src/main.rs:287:5
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 17 20:45:33.386 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.386 INFO [stderr]     |
Dec 17 20:45:33.386 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.386 INFO [stderr] 
Dec 17 20:45:33.388 INFO [stderr] warning: variable does not need to be mutable
Dec 17 20:45:33.388 INFO [stderr]   --> src/main.rs:94:8
Dec 17 20:45:33.388 INFO [stderr]    |
Dec 17 20:45:33.388 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 17 20:45:33.388 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 17 20:45:33.388 INFO [stderr]    |                 |
Dec 17 20:45:33.388 INFO [stderr]    |                 help: remove this `mut`
Dec 17 20:45:33.388 INFO [stderr]    |
Dec 17 20:45:33.388 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 17 20:45:33.388 INFO [stderr] 
Dec 17 20:45:33.420 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.420 INFO [stderr]    --> src/main.rs:210:2
Dec 17 20:45:33.420 INFO [stderr]     |
Dec 17 20:45:33.420 INFO [stderr] 210 |     io::stdout().flush();
Dec 17 20:45:33.420 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.420 INFO [stderr]     |
Dec 17 20:45:33.420 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 17 20:45:33.420 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.420 INFO [stderr] 
Dec 17 20:45:33.420 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.420 INFO [stderr]    --> src/main.rs:211:2
Dec 17 20:45:33.420 INFO [stderr]     |
Dec 17 20:45:33.420 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 17 20:45:33.420 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.420 INFO [stderr]     |
Dec 17 20:45:33.420 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.421 INFO [stderr] 
Dec 17 20:45:33.421 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.421 INFO [stderr]    --> src/main.rs:213:2
Dec 17 20:45:33.421 INFO [stderr]     |
Dec 17 20:45:33.421 INFO [stderr] 213 |     io::stdout().flush();
Dec 17 20:45:33.421 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.421 INFO [stderr]     |
Dec 17 20:45:33.421 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.421 INFO [stderr] 
Dec 17 20:45:33.433 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.434 INFO [stderr]    --> src/main.rs:214:2
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 17 20:45:33.434 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.434 INFO [stderr] 
Dec 17 20:45:33.434 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.434 INFO [stderr]    --> src/main.rs:229:3
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr] 229 |         io::stdout().flush();
Dec 17 20:45:33.434 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.434 INFO [stderr] 
Dec 17 20:45:33.434 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.434 INFO [stderr]    --> src/main.rs:231:3
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 17 20:45:33.434 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.434 INFO [stderr] 
Dec 17 20:45:33.434 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.434 INFO [stderr]    --> src/main.rs:247:5
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.434 INFO [stderr] 247 |                 io::stdout().flush();
Dec 17 20:45:33.434 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.434 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:248:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:250:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 250 |                 io::stdout().flush();
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:251:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:253:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 253 |                 io::stdout().flush();
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:254:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:274:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 274 |                 io::stdout().flush();
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:275:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:286:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 286 |                 io::stdout().flush();
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.435 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 17 20:45:33.435 INFO [stderr]    --> src/main.rs:287:5
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 17 20:45:33.435 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 20:45:33.435 INFO [stderr]     |
Dec 17 20:45:33.435 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 17 20:45:33.435 INFO [stderr] 
Dec 17 20:45:33.479 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.86s
Dec 17 20:45:34.116 INFO running `"docker" "inspect" "19cf75d1ead5150f7853193d310e0de943839a121e5bf93704947d671d769520"`
Dec 17 20:45:34.442 INFO running `"docker" "rm" "-f" "19cf75d1ead5150f7853193d310e0de943839a121e5bf93704947d671d769520"`
Dec 17 20:45:34.808 INFO [stdout] 19cf75d1ead5150f7853193d310e0de943839a121e5bf93704947d671d769520