Dec 19 06:23:54.425 INFO checking uma0317/Rust-BlockChain against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 06:23:54.425 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/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" "+d99a320cba42f661aebfa1293b7b2ec3603dda75-alt" "check" "--frozen" "--all" "--all-targets"`
Dec 19 06:23:54.877 INFO [stdout] 5f62ff1cff3bcbdb6ddbbe7345582d12c3dbc1929c0d15af4e5ddb2b98f03d16
Dec 19 06:23:54.886 INFO running `"docker" "start" "-a" "5f62ff1cff3bcbdb6ddbbe7345582d12c3dbc1929c0d15af4e5ddb2b98f03d16"`
Dec 19 06:23:56.576 INFO [stderr]     Checking libc v0.2.41
Dec 19 06:23:57.719 INFO [stderr]     Checking rand v0.4.2
Dec 19 06:23:57.720 INFO [stderr]     Checking time v0.1.40
Dec 19 06:23:58.669 INFO [stderr]     Checking chrono v0.4.2
Dec 19 06:23:59.169 INFO [stderr]     Checking rand v0.3.22
Dec 19 06:23:59.280 INFO [stderr]     Checking rust-crypto v0.2.36
Dec 19 06:24:04.118 INFO [stderr]     Checking blockchain v0.1.0 (/opt/crater/workdir)
Dec 19 06:24:04.292 INFO [stderr] warning: unused import: `Block`
Dec 19 06:24:04.292 INFO [stderr]  --> src/main.rs:3:30
Dec 19 06:24:04.292 INFO [stderr]   |
Dec 19 06:24:04.292 INFO [stderr] 3 | use blockchain::{Blockchain, Block, Transaction};
Dec 19 06:24:04.292 INFO [stderr]   |                              ^^^^^
Dec 19 06:24:04.292 INFO [stderr]   |
Dec 19 06:24:04.292 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:24:04.292 INFO [stderr] 
Dec 19 06:24:04.384 INFO [stderr] warning: unused import: `Block`
Dec 19 06:24:04.384 INFO [stderr]  --> src/main.rs:3:30
Dec 19 06:24:04.384 INFO [stderr]   |
Dec 19 06:24:04.384 INFO [stderr] 3 | use blockchain::{Blockchain, Block, Transaction};
Dec 19 06:24:04.384 INFO [stderr]   |                              ^^^^^
Dec 19 06:24:04.384 INFO [stderr]   |
Dec 19 06:24:04.384 INFO [stderr]   = note: #[warn(unused_imports)] on by default
Dec 19 06:24:04.384 INFO [stderr] 
Dec 19 06:24:04.413 INFO [stderr] warning: method is never used: `is_chain_valid`
Dec 19 06:24:04.413 INFO [stderr]    --> src/blockchain.rs:164:5
Dec 19 06:24:04.413 INFO [stderr]     |
Dec 19 06:24:04.413 INFO [stderr] 164 |     fn is_chain_valid(&self) -> bool {
Dec 19 06:24:04.413 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 06:24:04.413 INFO [stderr]     |
Dec 19 06:24:04.413 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 19 06:24:04.413 INFO [stderr] 
Dec 19 06:24:04.536 INFO [stderr] warning: method is never used: `is_chain_valid`
Dec 19 06:24:04.536 INFO [stderr]    --> src/blockchain.rs:164:5
Dec 19 06:24:04.536 INFO [stderr]     |
Dec 19 06:24:04.536 INFO [stderr] 164 |     fn is_chain_valid(&self) -> bool {
Dec 19 06:24:04.536 INFO [stderr]     |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 06:24:04.536 INFO [stderr]     |
Dec 19 06:24:04.536 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 19 06:24:04.536 INFO [stderr] 
Dec 19 06:24:04.588 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 8.08s
Dec 19 06:24:05.172 INFO running `"docker" "inspect" "5f62ff1cff3bcbdb6ddbbe7345582d12c3dbc1929c0d15af4e5ddb2b98f03d16"`
Dec 19 06:24:05.394 INFO running `"docker" "rm" "-f" "5f62ff1cff3bcbdb6ddbbe7345582d12c3dbc1929c0d15af4e5ddb2b98f03d16"`
Dec 19 06:24:05.640 INFO [stdout] 5f62ff1cff3bcbdb6ddbbe7345582d12c3dbc1929c0d15af4e5ddb2b98f03d16