Dec 17 12:50:21.280 INFO checking uma0317/Rust-BlockChain against try#0b8c5828f68d7b2840b81fa51239346dc97fef5a for pr-54252
Dec 17 12:50:21.280 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-54252/worker-6/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-54252/sources/try#0b8c5828f68d7b2840b81fa51239346dc97fef5a/gh/uma0317/Rust-BlockChain:/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 12:50:21.541 INFO [stdout] 9cf756d88910aedf675f1e8c1323eecb7b6c46131f251e3ea23afbd757f4bbdf
Dec 17 12:50:21.546 INFO running `"docker" "start" "-a" "9cf756d88910aedf675f1e8c1323eecb7b6c46131f251e3ea23afbd757f4bbdf"`
Dec 17 12:50:22.323 INFO [stderr]     Checking rand v0.4.2
Dec 17 12:50:22.323 INFO [stderr]     Checking time v0.1.40
Dec 17 12:50:22.323 INFO [stderr]    Compiling rust-crypto v0.2.36
Dec 17 12:50:22.950 INFO [stderr]     Checking chrono v0.4.2
Dec 17 12:50:23.555 INFO [stderr]     Checking rand v0.3.22
Dec 17 12:50:28.310 INFO [stderr]     Checking blockchain v0.1.0 (/opt/crater/workdir)
Dec 17 12:50:28.544 INFO [stderr] warning: unused import: `Block`
Dec 17 12:50:28.545 INFO [stderr]  --> src/main.rs:3:30
Dec 17 12:50:28.545 INFO [stderr]   |
Dec 17 12:50:28.545 INFO [stderr] 3 | use blockchain::{Blockchain, Block, Transaction};
Dec 17 12:50:28.545 INFO [stderr]   |                              ^^^^^
Dec 17 12:50:28.546 INFO [stderr]   |
Dec 17 12:50:28.546 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 12:50:28.546 INFO [stderr] 
Dec 17 12:50:28.571 INFO [stderr] warning: unused import: `Block`
Dec 17 12:50:28.571 INFO [stderr]  --> src/main.rs:3:30
Dec 17 12:50:28.571 INFO [stderr]   |
Dec 17 12:50:28.572 INFO [stderr] 3 | use blockchain::{Blockchain, Block, Transaction};
Dec 17 12:50:28.572 INFO [stderr]   |                              ^^^^^
Dec 17 12:50:28.572 INFO [stderr]   |
Dec 17 12:50:28.572 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 17 12:50:28.573 INFO [stderr] 
Dec 17 12:50:28.692 INFO [stderr] warning: method is never used: `is_chain_valid`
Dec 17 12:50:28.693 INFO [stderr]    --> src/blockchain.rs:164:5
Dec 17 12:50:28.693 INFO [stderr]     |
Dec 17 12:50:28.693 INFO [stderr] 164 |     fn is_chain_valid(&self) -> bool {
Dec 17 12:50:28.693 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 12:50:28.694 INFO [stderr]     |
Dec 17 12:50:28.694 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 17 12:50:28.694 INFO [stderr] 
Dec 17 12:50:28.732 INFO [stderr] warning: method is never used: `is_chain_valid`
Dec 17 12:50:28.732 INFO [stderr]    --> src/blockchain.rs:164:5
Dec 17 12:50:28.732 INFO [stderr]     |
Dec 17 12:50:28.732 INFO [stderr] 164 |     fn is_chain_valid(&self) -> bool {
Dec 17 12:50:28.732 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 17 12:50:28.733 INFO [stderr]     |
Dec 17 12:50:28.733 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 17 12:50:28.733 INFO [stderr] 
Dec 17 12:50:28.781 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.50s
Dec 17 12:50:30.062 INFO running `"docker" "inspect" "9cf756d88910aedf675f1e8c1323eecb7b6c46131f251e3ea23afbd757f4bbdf"`
Dec 17 12:50:30.340 INFO running `"docker" "rm" "-f" "9cf756d88910aedf675f1e8c1323eecb7b6c46131f251e3ea23afbd757f4bbdf"`
Dec 17 12:50:30.661 INFO [stdout] 9cf756d88910aedf675f1e8c1323eecb7b6c46131f251e3ea23afbd757f4bbdf