Dec 19 04:59:51.629 INFO checking yogesum/blockchain-rs against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 04:59:51.629 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-7/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/yogesum/blockchain-rs:/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 04:59:52.132 INFO [stdout] c13281bd279d294a4a6bcaa311af7bae806ef9d7ae3c530b1e6e8181c96d35cc
Dec 19 04:59:52.134 INFO running `"docker" "start" "-a" "c13281bd279d294a4a6bcaa311af7bae806ef9d7ae3c530b1e6e8181c96d35cc"`
Dec 19 04:59:54.424 INFO [stderr]     Checking arrayref v0.3.4
Dec 19 04:59:54.424 INFO [stderr]     Checking num-traits v0.2.2
Dec 19 04:59:54.424 INFO [stderr]     Checking serde v1.0.37
Dec 19 04:59:54.424 INFO [stderr]    Compiling proc-macro2 v0.3.1
Dec 19 04:59:54.424 INFO [stderr]     Checking digest v0.7.2
Dec 19 04:59:54.898 INFO [stderr]     Checking block-buffer v0.3.3
Dec 19 04:59:56.292 INFO [stderr]     Checking sha2 v0.7.0
Dec 19 04:59:59.496 INFO [stderr]    Compiling quote v0.5.1
Dec 19 05:00:00.652 INFO [stderr]    Compiling syn v0.13.1
Dec 19 05:00:11.100 INFO [stderr]    Compiling serde_derive_internals v0.23.0
Dec 19 05:00:16.548 INFO [stderr]    Compiling serde_derive v1.0.37
Dec 19 05:00:19.404 INFO [stderr]     Checking serde_json v1.0.13
Dec 19 05:00:27.888 INFO [stderr]     Checking blockchain-rs v0.1.0 (/opt/crater/workdir)
Dec 19 05:00:28.472 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.472 INFO [stderr]   --> src/main.rs:16:5
Dec 19 05:00:28.472 INFO [stderr]    |
Dec 19 05:00:28.472 INFO [stderr] 16 |     io::stdout().flush();
Dec 19 05:00:28.472 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.472 INFO [stderr]    |
Dec 19 05:00:28.472 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 05:00:28.472 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.472 INFO [stderr] 
Dec 19 05:00:28.472 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.472 INFO [stderr]   --> src/main.rs:17:5
Dec 19 05:00:28.472 INFO [stderr]    |
Dec 19 05:00:28.472 INFO [stderr] 17 |     io::stdin().read_line(&mut miner_addr);
Dec 19 05:00:28.472 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.472 INFO [stderr]    |
Dec 19 05:00:28.472 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.472 INFO [stderr] 
Dec 19 05:00:28.472 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.472 INFO [stderr]   --> src/main.rs:20:5
Dec 19 05:00:28.472 INFO [stderr]    |
Dec 19 05:00:28.472 INFO [stderr] 20 |     io::stdout().flush();
Dec 19 05:00:28.472 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:21:5
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 21 |     io::stdin().read_line(&mut difficulty);
Dec 19 05:00:28.473 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:38:9
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 38 |         io::stdout().flush();
Dec 19 05:00:28.473 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:41:9
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 41 |         io::stdin().read_line(&mut choice);
Dec 19 05:00:28.473 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:55:17
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 55 |                 io::stdout().flush();
Dec 19 05:00:28.473 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:56:17
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 56 |                 io::stdin().read_line(&mut sender);
Dec 19 05:00:28.473 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:59:17
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 59 |                 io::stdout().flush();
Dec 19 05:00:28.473 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.473 INFO [stderr] 
Dec 19 05:00:28.473 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.473 INFO [stderr]   --> src/main.rs:60:17
Dec 19 05:00:28.473 INFO [stderr]    |
Dec 19 05:00:28.473 INFO [stderr] 60 |                 io::stdin().read_line(&mut receiver);
Dec 19 05:00:28.474 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]   --> src/main.rs:63:17
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr] 63 |                 io::stdout().flush();
Dec 19 05:00:28.474 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]   --> src/main.rs:64:17
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr] 64 |                 io::stdin().read_line(&mut amount);
Dec 19 05:00:28.474 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]   --> src/main.rs:89:17
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr] 89 |                 io::stdout().flush();
Dec 19 05:00:28.474 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]   --> src/main.rs:90:17
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr] 90 |                 io::stdin().read_line(&mut new_diff);
Dec 19 05:00:28.474 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]    |
Dec 19 05:00:28.474 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]    --> src/main.rs:101:17
Dec 19 05:00:28.474 INFO [stderr]     |
Dec 19 05:00:28.474 INFO [stderr] 101 |                 io::stdout().flush();
Dec 19 05:00:28.474 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]     |
Dec 19 05:00:28.474 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.474 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.474 INFO [stderr]    --> src/main.rs:102:17
Dec 19 05:00:28.474 INFO [stderr]     |
Dec 19 05:00:28.474 INFO [stderr] 102 |                 io::stdin().read_line(&mut new_reward);
Dec 19 05:00:28.474 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.474 INFO [stderr]     |
Dec 19 05:00:28.474 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.474 INFO [stderr] 
Dec 19 05:00:28.690 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.690 INFO [stderr]   --> src/main.rs:16:5
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr] 16 |     io::stdout().flush();
Dec 19 05:00:28.690 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr]    = note: #[warn(unused_must_use)] on by default
Dec 19 05:00:28.690 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.690 INFO [stderr] 
Dec 19 05:00:28.690 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.690 INFO [stderr]   --> src/main.rs:17:5
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr] 17 |     io::stdin().read_line(&mut miner_addr);
Dec 19 05:00:28.690 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.690 INFO [stderr] 
Dec 19 05:00:28.690 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.690 INFO [stderr]   --> src/main.rs:20:5
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr] 20 |     io::stdout().flush();
Dec 19 05:00:28.690 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.690 INFO [stderr] 
Dec 19 05:00:28.690 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.690 INFO [stderr]   --> src/main.rs:21:5
Dec 19 05:00:28.690 INFO [stderr]    |
Dec 19 05:00:28.690 INFO [stderr] 21 |     io::stdin().read_line(&mut difficulty);
Dec 19 05:00:28.690 INFO [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:38:9
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 38 |         io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:41:9
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 41 |         io::stdin().read_line(&mut choice);
Dec 19 05:00:28.691 INFO [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:55:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 55 |                 io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:56:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 56 |                 io::stdin().read_line(&mut sender);
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:59:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 59 |                 io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:60:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 60 |                 io::stdin().read_line(&mut receiver);
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:63:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 63 |                 io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:64:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 64 |                 io::stdin().read_line(&mut amount);
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:89:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 89 |                 io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]   --> src/main.rs:90:17
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr] 90 |                 io::stdin().read_line(&mut new_diff);
Dec 19 05:00:28.691 INFO [stderr]    |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]    |
Dec 19 05:00:28.691 INFO [stderr]    = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]    --> src/main.rs:101:17
Dec 19 05:00:28.691 INFO [stderr]     |
Dec 19 05:00:28.691 INFO [stderr] 101 |                 io::stdout().flush();
Dec 19 05:00:28.691 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.691 INFO [stderr]     |
Dec 19 05:00:28.691 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.691 INFO [stderr] 
Dec 19 05:00:28.691 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 19 05:00:28.691 INFO [stderr]    --> src/main.rs:102:17
Dec 19 05:00:28.692 INFO [stderr]     |
Dec 19 05:00:28.692 INFO [stderr] 102 |                 io::stdin().read_line(&mut new_reward);
Dec 19 05:00:28.692 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 05:00:28.692 INFO [stderr]     |
Dec 19 05:00:28.692 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 19 05:00:28.692 INFO [stderr] 
Dec 19 05:00:28.723 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 34.42s
Dec 19 05:00:29.925 INFO running `"docker" "inspect" "c13281bd279d294a4a6bcaa311af7bae806ef9d7ae3c530b1e6e8181c96d35cc"`
Dec 19 05:00:30.244 INFO running `"docker" "rm" "-f" "c13281bd279d294a4a6bcaa311af7bae806ef9d7ae3c530b1e6e8181c96d35cc"`
Dec 19 05:00:30.600 INFO [stdout] c13281bd279d294a4a6bcaa311af7bae806ef9d7ae3c530b1e6e8181c96d35cc