[INFO] updating cached repository PEshwar/toy_blockchain
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/PEshwar/toy_blockchain
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/PEshwar/toy_blockchain" "work/ex/beta-1.38-1/sources/1.37.0/gh/PEshwar/toy_blockchain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/1.37.0/gh/PEshwar/toy_blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/PEshwar/toy_blockchain" "work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_blockchain"`
[INFO] [stderr] Cloning into 'work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_blockchain'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] c3f9d29fea64ac54da7ebb46da5a04e995585d22
[INFO] sha for GitHub repo PEshwar/toy_blockchain: c3f9d29fea64ac54da7ebb46da5a04e995585d22
[INFO] validating manifest of PEshwar/toy_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 PEshwar/toy_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 PEshwar/toy_blockchain
[INFO] finished frobbing PEshwar/toy_blockchain
[INFO] frobbed toml for PEshwar/toy_blockchain written to work/ex/beta-1.38-1/sources/1.37.0/gh/PEshwar/toy_blockchain/Cargo.toml
[INFO] started frobbing PEshwar/toy_blockchain
[INFO] finished frobbing PEshwar/toy_blockchain
[INFO] frobbed toml for PEshwar/toy_blockchain written to work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_blockchain/Cargo.toml
[INFO] crate PEshwar/toy_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 PEshwar/toy_blockchain against beta-2019-08-13 for beta-1.38-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_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" "+beta-2019-08-13" "build" "--frozen"`
[INFO] [stdout] f93fecfaed4d50efbe1886ee61c206870ea06b1d7962bdb163ffd34bc08f4526
[INFO] running `"docker" "start" "-a" "f93fecfaed4d50efbe1886ee61c206870ea06b1d7962bdb163ffd34bc08f4526"`
[INFO] [stderr]    Compiling syn v0.15.39
[INFO] [stderr]    Compiling openssl-sys v0.9.47
[INFO] [stderr]    Compiling openssl v0.10.23
[INFO] [stderr]    Compiling crypto-hash v0.3.3
[INFO] [stderr]    Compiling serde_derive v1.0.94
[INFO] [stderr]    Compiling serde v1.0.94
[INFO] [stderr]    Compiling serde_json v1.0.40
[INFO] [stderr]    Compiling peblock v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn new(timestamp: u64, transactions: Vec<Transaction>, previous_block: &Block) -> Block {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `genesis`
[INFO] [stderr]   --> src/main.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn genesis() -> Block {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_json`
[INFO] [stderr]   --> src/main.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     pub fn to_json(&self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `hash`
[INFO] [stderr]   --> src/main.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn hash(block: &Block) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_valid`
[INFO] [stderr]   --> src/main.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn is_valid(hash: &str, prefix: &str) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mine_next_block`
[INFO] [stderr]   --> src/main.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     fn mine_next_block(candidate_block: &mut Block, prefix: &str)  {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Blockchain`
[INFO] [stderr]   --> src/main.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | struct Blockchain {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 49.53s
[INFO] running `"docker" "inspect" "f93fecfaed4d50efbe1886ee61c206870ea06b1d7962bdb163ffd34bc08f4526"`
[INFO] running `"docker" "rm" "-f" "f93fecfaed4d50efbe1886ee61c206870ea06b1d7962bdb163ffd34bc08f4526"`
[INFO] [stdout] f93fecfaed4d50efbe1886ee61c206870ea06b1d7962bdb163ffd34bc08f4526
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_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" "+beta-2019-08-13" "test" "--frozen" "--no-run"`
[INFO] [stdout] 0b0433d99e5f62a15799784a0e23a536253b38d23b5fc45c6a0073148b6520f1
[INFO] running `"docker" "start" "-a" "0b0433d99e5f62a15799784a0e23a536253b38d23b5fc45c6a0073148b6520f1"`
[INFO] [stderr]    Compiling peblock v0.1.0 (/opt/crater/workdir)
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/main.rs:35:5
[INFO] [stderr]    |
[INFO] [stderr] 35 |     pub fn new(timestamp: u64, transactions: Vec<Transaction>, previous_block: &Block) -> Block {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `genesis`
[INFO] [stderr]   --> src/main.rs:46:5
[INFO] [stderr]    |
[INFO] [stderr] 46 |     pub fn genesis() -> Block {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `to_json`
[INFO] [stderr]   --> src/main.rs:60:5
[INFO] [stderr]    |
[INFO] [stderr] 60 |     pub fn to_json(&self) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `hash`
[INFO] [stderr]   --> src/main.rs:64:5
[INFO] [stderr]    |
[INFO] [stderr] 64 |     pub fn hash(block: &Block) -> String {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `is_valid`
[INFO] [stderr]   --> src/main.rs:68:5
[INFO] [stderr]    |
[INFO] [stderr] 68 |     pub fn is_valid(hash: &str, prefix: &str) -> bool {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `mine_next_block`
[INFO] [stderr]   --> src/main.rs:71:5
[INFO] [stderr]    |
[INFO] [stderr] 71 |     fn mine_next_block(candidate_block: &mut Block, prefix: &str)  {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `Blockchain`
[INFO] [stderr]   --> src/main.rs:80:1
[INFO] [stderr]    |
[INFO] [stderr] 80 | struct Blockchain {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.13s
[INFO] running `"docker" "inspect" "0b0433d99e5f62a15799784a0e23a536253b38d23b5fc45c6a0073148b6520f1"`
[INFO] running `"docker" "rm" "-f" "0b0433d99e5f62a15799784a0e23a536253b38d23b5fc45c6a0073148b6520f1"`
[INFO] [stdout] 0b0433d99e5f62a15799784a0e23a536253b38d23b5fc45c6a0073148b6520f1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/beta-1.38-1/worker-4/beta-2019-08-13:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/beta-1.38-1/sources/beta-2019-08-13/gh/PEshwar/toy_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" "+beta-2019-08-13" "test" "--frozen"`
[INFO] [stdout] 9c808d3a153d01e6cc4b3d73b3321ae7248a3467164f2a31f948d93355f23cd7
[INFO] running `"docker" "start" "-a" "9c808d3a153d01e6cc4b3d73b3321ae7248a3467164f2a31f948d93355f23cd7"`
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.10s
[INFO] [stderr]      Running /opt/crater/target/debug/deps/peblock-d93fe9e6cb4e155a
[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" "9c808d3a153d01e6cc4b3d73b3321ae7248a3467164f2a31f948d93355f23cd7"`
[INFO] running `"docker" "rm" "-f" "9c808d3a153d01e6cc4b3d73b3321ae7248a3467164f2a31f948d93355f23cd7"`
[INFO] [stdout] 9c808d3a153d01e6cc4b3d73b3321ae7248a3467164f2a31f948d93355f23cd7