[INFO] updating cached repository carlosgj94/simple_blockchain
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/carlosgj94/simple_blockchain
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/carlosgj94/simple_blockchain" "work/ex/beta-1.38-1/sources/1.37.0/gh/carlosgj94/simple_blockchain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/carlosgj94/simple_blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/carlosgj94/simple_blockchain" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carlosgj94/simple_blockchain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carlosgj94/simple_blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 5f1c49970e56d09ea6fd8e84a1294cb183c7ccbd
[INFO] sha for GitHub repo carlosgj94/simple_blockchain: 5f1c49970e56d09ea6fd8e84a1294cb183c7ccbd
[INFO] validating manifest of carlosgj94/simple_blockchain on toolchain 1.37.0
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of carlosgj94/simple_blockchain on toolchain beta-2019-08-13
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing carlosgj94/simple_blockchain
[INFO] finished frobbing carlosgj94/simple_blockchain
[INFO] frobbed toml for carlosgj94/simple_blockchain written to work/ex/beta-1.38-1/sources/1.37.0/gh/carlosgj94/simple_blockchain/Cargo.toml
[INFO] started frobbing carlosgj94/simple_blockchain
[INFO] finished frobbing carlosgj94/simple_blockchain
[INFO] frobbed toml for carlosgj94/simple_blockchain written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/carlosgj94/simple_blockchain/Cargo.toml
[INFO] crate carlosgj94/simple_blockchain already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+1.37.0" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+beta-2019-08-13" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] testing carlosgj94/simple_blockchain against 1.37.0 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "build" "--frozen"`
[INFO] [stdout] f80f37f1d071ea43fa5790a8acb7e83d4555267aa8353a0fe846794269c99438
[INFO] running `"docker" "start" "-a" "f80f37f1d071ea43fa5790a8acb7e83d4555267aa8353a0fe846794269c99438"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]    Compiling rust-crypto v0.2.36
[INFO] [stderr]    Compiling simple_blockchain v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `hash` is never read
[INFO] [stderr]   --> src/main.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut hash = String::new();
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_valid_new_block`
[INFO] [stderr]    --> src/main.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 9.93s
[INFO] running `"docker" "inspect" "f80f37f1d071ea43fa5790a8acb7e83d4555267aa8353a0fe846794269c99438"`
[INFO] running `"docker" "rm" "-f" "f80f37f1d071ea43fa5790a8acb7e83d4555267aa8353a0fe846794269c99438"`
[INFO] [stdout] f80f37f1d071ea43fa5790a8acb7e83d4555267aa8353a0fe846794269c99438
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "test" "--frozen" "--no-run"`
[INFO] [stdout] 56593fbe7e0a094e8d99f2ccf1d019c6f11c93b2305b276f47002aa7dd17d956
[INFO] running `"docker" "start" "-a" "56593fbe7e0a094e8d99f2ccf1d019c6f11c93b2305b276f47002aa7dd17d956"`
[INFO] [stderr]    Compiling simple_blockchain v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: value assigned to `hash` is never read
[INFO] [stderr]   --> src/main.rs:73:13
[INFO] [stderr]    |
[INFO] [stderr] 73 |     let mut hash = String::new();
[INFO] [stderr]    |             ^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: #[warn(unused_assignments)] on by default
[INFO] [stderr]    = help: maybe it is overwritten before being read?
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `is_valid_new_block`
[INFO] [stderr]    --> src/main.rs:104:1
[INFO] [stderr]     |
[INFO] [stderr] 104 | fn is_valid_new_block(n_block: Block, p_block: Block) -> bool {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     |
[INFO] [stderr]     = note: #[warn(dead_code)] on by default
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.91s
[INFO] running `"docker" "inspect" "56593fbe7e0a094e8d99f2ccf1d019c6f11c93b2305b276f47002aa7dd17d956"`
[INFO] running `"docker" "rm" "-f" "56593fbe7e0a094e8d99f2ccf1d019c6f11c93b2305b276f47002aa7dd17d956"`
[INFO] [stdout] 56593fbe7e0a094e8d99f2ccf1d019c6f11c93b2305b276f47002aa7dd17d956
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/1.37.0:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/1.37.0/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=warn" "-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" "+1.37.0" "test" "--frozen"`
[INFO] [stdout] 991e9a45b015d233237850b4be0d4c94158912acc9d26678bb7eaaedb15098e7
[INFO] running `"docker" "start" "-a" "991e9a45b015d233237850b4be0d4c94158912acc9d26678bb7eaaedb15098e7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.04s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/simple_blockchain-04247d9a1d298279
[INFO] [stdout] 
[INFO] [stdout] running 0 tests
[INFO] [stdout] 
[INFO] [stdout] test result: ok. 0 passed; 0 failed; 0 ignored; 0 measured; 0 filtered out
[INFO] [stdout] 
[INFO] running `"docker" "inspect" "991e9a45b015d233237850b4be0d4c94158912acc9d26678bb7eaaedb15098e7"`
[INFO] running `"docker" "rm" "-f" "991e9a45b015d233237850b4be0d4c94158912acc9d26678bb7eaaedb15098e7"`
[INFO] [stdout] 991e9a45b015d233237850b4be0d4c94158912acc9d26678bb7eaaedb15098e7