Dec 19 19:18:34.756 INFO checking carlosgj94/simple_blockchain against master#d99a320cba42f661aebfa1293b7b2ec3603dda75 for pr-56955
Dec 19 19:18:34.756 INFO running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-56955/worker-5/master#d99a320cba42f661aebfa1293b7b2ec3603dda75:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-56955/sources/master#d99a320cba42f661aebfa1293b7b2ec3603dda75/gh/carlosgj94/simple_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 19:18:35.343 INFO [stdout] 30f537e8922325cbb581b3adc85d1af5c287482e4037a41c600d63d95bbae880
Dec 19 19:18:35.343 INFO running `"docker" "start" "-a" "30f537e8922325cbb581b3adc85d1af5c287482e4037a41c600d63d95bbae880"`
Dec 19 19:18:37.268 INFO [stderr]    Compiling rust-crypto v0.2.36
Dec 19 19:18:43.020 INFO [stderr]     Checking simple_blockchain v0.1.0 (/opt/crater/workdir)
Dec 19 19:18:43.328 INFO [stderr] warning: value assigned to `hash` is never read
Dec 19 19:18:43.328 INFO [stderr]   --> src/main.rs:73:13
Dec 19 19:18:43.328 INFO [stderr]    |
Dec 19 19:18:43.328 INFO [stderr] 73 |     let mut hash = String::new();
Dec 19 19:18:43.328 INFO [stderr]    |             ^^^^
Dec 19 19:18:43.328 INFO [stderr]    |
Dec 19 19:18:43.328 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 19:18:43.332 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 19:18:43.332 INFO [stderr] 
Dec 19 19:18:43.348 INFO [stderr] warning: function is never used: `is_valid_new_block`
Dec 19 19:18:43.348 INFO [stderr]    --> src/main.rs:104:1
Dec 19 19:18:43.348 INFO [stderr]     |
Dec 19 19:18:43.348 INFO [stderr] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
Dec 19 19:18:43.348 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 19:18:43.348 INFO [stderr]     |
Dec 19 19:18:43.348 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 19 19:18:43.348 INFO [stderr] 
Dec 19 19:18:43.424 INFO [stderr] warning: value assigned to `hash` is never read
Dec 19 19:18:43.424 INFO [stderr]   --> src/main.rs:73:13
Dec 19 19:18:43.424 INFO [stderr]    |
Dec 19 19:18:43.424 INFO [stderr] 73 |     let mut hash = String::new();
Dec 19 19:18:43.424 INFO [stderr]    |             ^^^^
Dec 19 19:18:43.424 INFO [stderr]    |
Dec 19 19:18:43.424 INFO [stderr]    = note: #[warn(unused_assignments)] on by default
Dec 19 19:18:43.424 INFO [stderr]    = help: maybe it is overwritten before being read?
Dec 19 19:18:43.424 INFO [stderr] 
Dec 19 19:18:43.444 INFO [stderr] warning: function is never used: `is_valid_new_block`
Dec 19 19:18:43.444 INFO [stderr]    --> src/main.rs:104:1
Dec 19 19:18:43.444 INFO [stderr]     |
Dec 19 19:18:43.444 INFO [stderr] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
Dec 19 19:18:43.444 INFO [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
Dec 19 19:18:43.444 INFO [stderr]     |
Dec 19 19:18:43.444 INFO [stderr]     = note: #[warn(dead_code)] on by default
Dec 19 19:18:43.444 INFO [stderr] 
Dec 19 19:18:43.467 INFO [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 6.26s
Dec 19 19:18:43.916 INFO running `"docker" "inspect" "30f537e8922325cbb581b3adc85d1af5c287482e4037a41c600d63d95bbae880"`
Dec 19 19:18:44.054 INFO running `"docker" "rm" "-f" "30f537e8922325cbb581b3adc85d1af5c287482e4037a41c600d63d95bbae880"`
Dec 19 19:18:44.188 INFO [stdout] 30f537e8922325cbb581b3adc85d1af5c287482e4037a41c600d63d95bbae880