Dec 13 12:48:54.776 INFO testing lezwon/Blockchain-from-Scratch against master#bd47d6825bf4090517549d33cfef10d3300b4a75 for pr-56550
Dec 13 12:48:54.776 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-6/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 12:48:54.979 INFO [stdout] 1e5367c707c135f884653a8bbc2e086db52671781c57db753fca9e7bce5ae4a3
Dec 13 12:48:54.984 INFO running `"docker" "start" "-a" "1e5367c707c135f884653a8bbc2e086db52671781c57db753fca9e7bce5ae4a3"`
Dec 13 12:48:55.378 INFO [stderr] usermod: no changes
Dec 13 12:48:55.460 INFO [stderr]    Compiling serde_json v1.0.6
Dec 13 12:48:58.931 INFO [stderr]    Compiling blockchain-rust v0.1.0 (/source)
Dec 13 12:48:59.774 INFO [stderr] warning: variable does not need to be mutable
Dec 13 12:48:59.774 INFO [stderr]   --> src/main.rs:94:8
Dec 13 12:48:59.774 INFO [stderr]    |
Dec 13 12:48:59.774 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 13 12:48:59.774 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 13 12:48:59.774 INFO [stderr]    |                 |
Dec 13 12:48:59.774 INFO [stderr]    |                 help: remove this `mut`
Dec 13 12:48:59.774 INFO [stderr]    |
Dec 13 12:48:59.774 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 13 12:48:59.774 INFO [stderr] 
Dec 13 12:48:59.789 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.789 INFO [stderr]    --> src/main.rs:210:2
Dec 13 12:48:59.789 INFO [stderr]     |
Dec 13 12:48:59.789 INFO [stderr] 210 |     io::stdout().flush();
Dec 13 12:48:59.789 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.789 INFO [stderr]     |
Dec 13 12:48:59.789 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 13 12:48:59.789 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.789 INFO [stderr] 
Dec 13 12:48:59.789 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.789 INFO [stderr]    --> src/main.rs:211:2
Dec 13 12:48:59.789 INFO [stderr]     |
Dec 13 12:48:59.789 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 13 12:48:59.789 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:213:2
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 213 |     io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:214:2
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 13 12:48:59.790 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:229:3
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 229 |         io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:231:3
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 13 12:48:59.790 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:247:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 247 |                 io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:248:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:250:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 250 |                 io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:251:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:253:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 253 |                 io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:254:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.790 INFO [stderr] 
Dec 13 12:48:59.790 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.790 INFO [stderr]    --> src/main.rs:274:5
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.790 INFO [stderr] 274 |                 io::stdout().flush();
Dec 13 12:48:59.790 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.790 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.791 INFO [stderr] 
Dec 13 12:48:59.791 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.791 INFO [stderr]    --> src/main.rs:275:5
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 13 12:48:59.791 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.791 INFO [stderr] 
Dec 13 12:48:59.791 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.791 INFO [stderr]    --> src/main.rs:286:5
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr] 286 |                 io::stdout().flush();
Dec 13 12:48:59.791 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.791 INFO [stderr] 
Dec 13 12:48:59.791 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:48:59.791 INFO [stderr]    --> src/main.rs:287:5
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 13 12:48:59.791 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:48:59.791 INFO [stderr]     |
Dec 13 12:48:59.791 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:48:59.791 INFO [stderr] 
Dec 13 12:49:00.907 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.51s
Dec 13 12:49:00.912 INFO [stderr] su: No module specific data is present
Dec 13 12:49:01.584 INFO running `"docker" "inspect" "1e5367c707c135f884653a8bbc2e086db52671781c57db753fca9e7bce5ae4a3"`
Dec 13 12:49:01.935 INFO running `"docker" "rm" "-f" "1e5367c707c135f884653a8bbc2e086db52671781c57db753fca9e7bce5ae4a3"`
Dec 13 12:49:02.222 INFO [stdout] 1e5367c707c135f884653a8bbc2e086db52671781c57db753fca9e7bce5ae4a3
Dec 13 12:49:02.225 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-6/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 12:49:02.706 INFO [stdout] d810cc399d34fd93c30c3e1219ba1ce5316884256c3a245d3ecb86c7b31f9ac9
Dec 13 12:49:02.715 INFO running `"docker" "start" "-a" "d810cc399d34fd93c30c3e1219ba1ce5316884256c3a245d3ecb86c7b31f9ac9"`
Dec 13 12:49:04.092 INFO [stderr] usermod: no changes
Dec 13 12:49:04.183 INFO [stderr]    Compiling blockchain-rust v0.1.0 (/source)
Dec 13 12:49:05.179 INFO [stderr] warning: variable does not need to be mutable
Dec 13 12:49:05.179 INFO [stderr]   --> src/main.rs:94:8
Dec 13 12:49:05.179 INFO [stderr]    |
Dec 13 12:49:05.179 INFO [stderr] 94 |             let mut block_header = BlockHeader{
Dec 13 12:49:05.179 INFO [stderr]    |                 ----^^^^^^^^^^^^
Dec 13 12:49:05.179 INFO [stderr]    |                 |
Dec 13 12:49:05.179 INFO [stderr]    |                 help: remove this `mut`
Dec 13 12:49:05.179 INFO [stderr]    |
Dec 13 12:49:05.179 INFO [stderr]    = note: #[warn(unused_mut)] on by default
Dec 13 12:49:05.179 INFO [stderr] 
Dec 13 12:49:05.199 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.199 INFO [stderr]    --> src/main.rs:210:2
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr] 210 |     io::stdout().flush();
Dec 13 12:49:05.199 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr]     = note: #[warn(unused_must_use)] on by default
Dec 13 12:49:05.199 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.199 INFO [stderr] 
Dec 13 12:49:05.199 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.199 INFO [stderr]    --> src/main.rs:211:2
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr] 211 |     io::stdin().read_line(&mut miner_address);
Dec 13 12:49:05.199 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.199 INFO [stderr] 
Dec 13 12:49:05.199 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.199 INFO [stderr]    --> src/main.rs:213:2
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr] 213 |     io::stdout().flush();
Dec 13 12:49:05.199 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.199 INFO [stderr] 
Dec 13 12:49:05.199 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.199 INFO [stderr]    --> src/main.rs:214:2
Dec 13 12:49:05.199 INFO [stderr]     |
Dec 13 12:49:05.199 INFO [stderr] 214 |     io::stdin().read_line(&mut difficulty_string);
Dec 13 12:49:05.200 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:229:3
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 229 |         io::stdout().flush();
Dec 13 12:49:05.200 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:231:3
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 231 |         io::stdin().read_line(&mut choice);
Dec 13 12:49:05.200 INFO [stderr]     |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:247:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 247 |                 io::stdout().flush();
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:248:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 248 |                 io::stdin().read_line(&mut sender);
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:250:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 250 |                 io::stdout().flush();
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:251:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 251 |                 io::stdin().read_line(&mut recipient);
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:253:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 253 |                 io::stdout().flush();
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:254:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 254 |                 io::stdin().read_line(&mut amount);
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:274:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 274 |                 io::stdout().flush();
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:275:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr] 275 |                 io::stdin().read_line(&mut new_difficulty);
Dec 13 12:49:05.200 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.200 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.200 INFO [stderr] 
Dec 13 12:49:05.200 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.200 INFO [stderr]    --> src/main.rs:286:5
Dec 13 12:49:05.200 INFO [stderr]     |
Dec 13 12:49:05.201 INFO [stderr] 286 |                 io::stdout().flush();
Dec 13 12:49:05.201 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.201 INFO [stderr]     |
Dec 13 12:49:05.201 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.201 INFO [stderr] 
Dec 13 12:49:05.201 INFO [stderr] warning: unused `std::result::Result` that must be used
Dec 13 12:49:05.201 INFO [stderr]    --> src/main.rs:287:5
Dec 13 12:49:05.201 INFO [stderr]     |
Dec 13 12:49:05.201 INFO [stderr] 287 |                 io::stdin().read_line(&mut new_reward);
Dec 13 12:49:05.201 INFO [stderr]     |                 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 13 12:49:05.201 INFO [stderr]     |
Dec 13 12:49:05.201 INFO [stderr]     = note: this `Result` may be an `Err` variant, which should be handled
Dec 13 12:49:05.201 INFO [stderr] 
Dec 13 12:49:05.643 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.52s
Dec 13 12:49:05.643 INFO [stderr] su: No module specific data is present
Dec 13 12:49:06.376 INFO running `"docker" "inspect" "d810cc399d34fd93c30c3e1219ba1ce5316884256c3a245d3ecb86c7b31f9ac9"`
Dec 13 12:49:06.910 INFO running `"docker" "rm" "-f" "d810cc399d34fd93c30c3e1219ba1ce5316884256c3a245d3ecb86c7b31f9ac9"`
Dec 13 12:49:07.367 INFO [stdout] d810cc399d34fd93c30c3e1219ba1ce5316884256c3a245d3ecb86c7b31f9ac9
Dec 13 12:49:07.422 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56550/worker-6/master#bd47d6825bf4090517549d33cfef10d3300b4a75:/target:rw,Z" "-v" "/mnt/big/crater/work/local/test-source/worker-6/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 12:49:07.861 INFO [stdout] be59e1bdd997b003d997407edf25d4b0e9aabb17ce35d383d1eb655e29e010bb
Dec 13 12:49:07.875 INFO running `"docker" "start" "-a" "be59e1bdd997b003d997407edf25d4b0e9aabb17ce35d383d1eb655e29e010bb"`
Dec 13 12:49:09.747 INFO [stderr] usermod: no changes
Dec 13 12:49:09.859 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.08s
Dec 13 12:49:09.869 INFO [stderr]      Running /target/debug/deps/blockchain_rust-9f46b9c5e5719b7e
Dec 13 12:49:09.875 INFO [stdout] 
Dec 13 12:49:09.875 INFO [stdout] running 0 tests
Dec 13 12:49:09.875 INFO [stdout] 
Dec 13 12:49:09.875 INFO [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
Dec 13 12:49:09.875 INFO [stdout] 
Dec 13 12:49:09.879 INFO [stderr] su: No module specific data is present
Dec 13 12:49:10.581 INFO running `"docker" "inspect" "be59e1bdd997b003d997407edf25d4b0e9aabb17ce35d383d1eb655e29e010bb"`
Dec 13 12:49:10.957 INFO running `"docker" "rm" "-f" "be59e1bdd997b003d997407edf25d4b0e9aabb17ce35d383d1eb655e29e010bb"`
Dec 13 12:49:11.323 INFO [stdout] be59e1bdd997b003d997407edf25d4b0e9aabb17ce35d383d1eb655e29e010bb