[INFO] cloning repository https://github.com/PrinceDavis/cli_blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/PrinceDavis/cli_blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrinceDavis%2Fcli_blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrinceDavis%2Fcli_blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 62942904ca7bdb34d3c53518128d281cc52acdd2
[INFO] testing PrinceDavis/cli_blockchain against try#b83b707f97d809763b7861afa7638871f3339a33 for pr-145838-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FPrinceDavis%2Fcli_blockchain" "/workspace/builds/worker-4-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/PrinceDavis/cli_blockchain
[INFO] finished tweaking git repo https://github.com/PrinceDavis/cli_blockchain
[INFO] tweaked toml for git repo https://github.com/PrinceDavis/cli_blockchain written to /workspace/builds/worker-4-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/PrinceDavis/cli_blockchain on toolchain b83b707f97d809763b7861afa7638871f3339a33
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/PrinceDavis/cli_blockchain already has a lockfile, it will not be regenerated
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 2167e8f8f3b3464569b50fdac7863fbbe63231113fd7cf0f66bcff524efd2455
[INFO] running `Command { std: "docker" "start" "-a" "2167e8f8f3b3464569b50fdac7863fbbe63231113fd7cf0f66bcff524efd2455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "2167e8f8f3b3464569b50fdac7863fbbe63231113fd7cf0f66bcff524efd2455", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2167e8f8f3b3464569b50fdac7863fbbe63231113fd7cf0f66bcff524efd2455", kill_on_drop: false }`
[INFO] [stdout] 2167e8f8f3b3464569b50fdac7863fbbe63231113fd7cf0f66bcff524efd2455
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 2a60fdbab53ee4f86a918b394bb289ab92dc2d7f432f20c4ae81e8e4f5d17cb7
[INFO] running `Command { std: "docker" "start" "-a" "2a60fdbab53ee4f86a918b394bb289ab92dc2d7f432f20c4ae81e8e4f5d17cb7", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.80
[INFO] [stderr]    Compiling version_check v0.9.4
[INFO] [stderr]    Compiling serde v1.0.198
[INFO] [stderr]    Compiling serde_json v1.0.116
[INFO] [stderr]    Compiling ryu v1.0.17
[INFO] [stderr]    Compiling generic-array v0.14.7
[INFO] [stderr]    Compiling quote v1.0.36
[INFO] [stderr]    Compiling syn v2.0.59
[INFO] [stderr]    Compiling crypto-common v0.1.6
[INFO] [stderr]    Compiling block-buffer v0.10.4
[INFO] [stderr]    Compiling digest v0.10.7
[INFO] [stderr]    Compiling sha2 v0.10.8
[INFO] [stderr]    Compiling serde_derive v1.0.198
[INFO] [stderr]    Compiling blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/blockchain.rs:157:9
[INFO] [stdout]     |
[INFO] [stdout] 157 |     let input = serde_json::to_string(&item).unwrap();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Transaction` is more private than the item `blockchain::Chain::get_merkle`
[INFO] [stdout]    --> src/blockchain.rs:110:3
[INFO] [stdout]     |
[INFO] [stdout] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated function `blockchain::Chain::get_merkle` is reachable at visibility `pub(crate)`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `Transaction` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/blockchain.rs:6:1
[INFO] [stdout]     |
[INFO] [stdout]   6 | struct Transaction {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Transaction` is never constructed
[INFO] [stdout]  --> src/blockchain.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Transaction {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlockHeader` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct BlockHeader  {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Block` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Block {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Chain` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Chain {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/blockchain.rs:36:10
[INFO] [stdout]     |
[INFO] [stdout]  35 | impl Chain {
[INFO] [stdout]     | ---------- associated items in this implementation
[INFO] [stdout]  36 |   pub fn new(miner_addr: String, difficulty: u32) -> Chain {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout]  48 |   pub fn new_transaction(&mut self, sender: String, reciever: String, amount: f32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  57 |   pub fn last_hash(&self) -> String {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  65 |   pub fn update_difficulty(&mut self, difficulty: u32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  70 |   pub fn update_reward(&mut self, reward: f32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  75 |   pub fn generate_new_block(&mut self) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 134 |   pub fn proof_of_work(header: &mut BlockHeader) {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |   pub fn hash<T:serde::Serialize>(item: &T) -> String {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.92s
[INFO] running `Command { std: "docker" "inspect" "2a60fdbab53ee4f86a918b394bb289ab92dc2d7f432f20c4ae81e8e4f5d17cb7", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "2a60fdbab53ee4f86a918b394bb289ab92dc2d7f432f20c4ae81e8e4f5d17cb7", kill_on_drop: false }`
[INFO] [stdout] 2a60fdbab53ee4f86a918b394bb289ab92dc2d7f432f20c4ae81e8e4f5d17cb7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 462656f1375a1b5eb9ce0ebe55e070cd2380161123dcbc71626cad64046e6778
[INFO] running `Command { std: "docker" "start" "-a" "462656f1375a1b5eb9ce0ebe55e070cd2380161123dcbc71626cad64046e6778", kill_on_drop: false }`
[INFO] [stderr]    Compiling blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused variable: `input`
[INFO] [stdout]    --> src/blockchain.rs:157:9
[INFO] [stdout]     |
[INFO] [stdout] 157 |     let input = serde_json::to_string(&item).unwrap();
[INFO] [stdout]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: type `Transaction` is more private than the item `blockchain::Chain::get_merkle`
[INFO] [stdout]    --> src/blockchain.rs:110:3
[INFO] [stdout]     |
[INFO] [stdout] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stdout]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated function `blockchain::Chain::get_merkle` is reachable at visibility `pub(crate)`
[INFO] [stdout]     |
[INFO] [stdout] note: but type `Transaction` is only usable at visibility `pub(self)`
[INFO] [stdout]    --> src/blockchain.rs:6:1
[INFO] [stdout]     |
[INFO] [stdout]   6 | struct Transaction {
[INFO] [stdout]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stdout]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Transaction` is never constructed
[INFO] [stdout]  --> src/blockchain.rs:6:8
[INFO] [stdout]   |
[INFO] [stdout] 6 | struct Transaction {
[INFO] [stdout]   |        ^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `BlockHeader` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:12:12
[INFO] [stdout]    |
[INFO] [stdout] 12 | pub struct BlockHeader  {
[INFO] [stdout]    |            ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Block` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:21:12
[INFO] [stdout]    |
[INFO] [stdout] 21 | pub struct Block {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: struct `Chain` is never constructed
[INFO] [stdout]   --> src/blockchain.rs:27:12
[INFO] [stdout]    |
[INFO] [stdout] 27 | pub struct Chain {
[INFO] [stdout]    |            ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: multiple associated items are never used
[INFO] [stdout]    --> src/blockchain.rs:36:10
[INFO] [stdout]     |
[INFO] [stdout]  35 | impl Chain {
[INFO] [stdout]     | ---------- associated items in this implementation
[INFO] [stdout]  36 |   pub fn new(miner_addr: String, difficulty: u32) -> Chain {
[INFO] [stdout]     |          ^^^
[INFO] [stdout] ...
[INFO] [stdout]  48 |   pub fn new_transaction(&mut self, sender: String, reciever: String, amount: f32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  57 |   pub fn last_hash(&self) -> String {
[INFO] [stdout]     |          ^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  65 |   pub fn update_difficulty(&mut self, difficulty: u32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  70 |   pub fn update_reward(&mut self, reward: f32) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout]  75 |   pub fn generate_new_block(&mut self) -> bool {
[INFO] [stdout]     |          ^^^^^^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stdout]     |          ^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 134 |   pub fn proof_of_work(header: &mut BlockHeader) {
[INFO] [stdout]     |          ^^^^^^^^^^^^^
[INFO] [stdout] ...
[INFO] [stdout] 156 |   pub fn hash<T:serde::Serialize>(item: &T) -> String {
[INFO] [stdout]     |          ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.54s
[INFO] running `Command { std: "docker" "inspect" "462656f1375a1b5eb9ce0ebe55e070cd2380161123dcbc71626cad64046e6778", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "462656f1375a1b5eb9ce0ebe55e070cd2380161123dcbc71626cad64046e6778", kill_on_drop: false }`
[INFO] [stdout] 462656f1375a1b5eb9ce0ebe55e070cd2380161123dcbc71626cad64046e6778
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc2/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/cargo-home:/opt/rustwide/cargo-home:ro,Z" "-v" "/var/lib/crater-agent-workspace/rustup-home:/opt/rustwide/rustup-home:ro,Z" "-e" "SOURCE_DIR=/opt/rustwide/workdir" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "RUSTDOCFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--user" "0:0" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:7ad1b28ee6f5f7f699f6cf7015098d6ccdd96d6f2d78dd06228f5b4c9faf309c" "/opt/rustwide/cargo-home/bin/cargo" "+b83b707f97d809763b7861afa7638871f3339a33" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] 4bf3c9c1935b7f8c4615113b4865612e6c6ce01229375815cadcac4ee14e0783
[INFO] running `Command { std: "docker" "start" "-a" "4bf3c9c1935b7f8c4615113b4865612e6c6ce01229375815cadcac4ee14e0783", kill_on_drop: false }`
[INFO] [stderr] warning: unused variable: `input`
[INFO] [stderr]    --> src/blockchain.rs:157:9
[INFO] [stderr]     |
[INFO] [stderr] 157 |     let input = serde_json::to_string(&item).unwrap();
[INFO] [stderr]     |         ^^^^^ help: if this is intentional, prefix it with an underscore: `_input`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: type `Transaction` is more private than the item `blockchain::Chain::get_merkle`
[INFO] [stderr]    --> src/blockchain.rs:110:3
[INFO] [stderr]     |
[INFO] [stderr] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stderr]     |   ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ associated function `blockchain::Chain::get_merkle` is reachable at visibility `pub(crate)`
[INFO] [stderr]     |
[INFO] [stderr] note: but type `Transaction` is only usable at visibility `pub(self)`
[INFO] [stderr]    --> src/blockchain.rs:6:1
[INFO] [stderr]     |
[INFO] [stderr]   6 | struct Transaction {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr]     = note: `#[warn(private_interfaces)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Transaction` is never constructed
[INFO] [stderr]  --> src/blockchain.rs:6:8
[INFO] [stderr]   |
[INFO] [stderr] 6 | struct Transaction {
[INFO] [stderr]   |        ^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `BlockHeader` is never constructed
[INFO] [stderr]   --> src/blockchain.rs:12:12
[INFO] [stderr]    |
[INFO] [stderr] 12 | pub struct BlockHeader  {
[INFO] [stderr]    |            ^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Block` is never constructed
[INFO] [stderr]   --> src/blockchain.rs:21:12
[INFO] [stderr]    |
[INFO] [stderr] 21 | pub struct Block {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: struct `Chain` is never constructed
[INFO] [stderr]   --> src/blockchain.rs:27:12
[INFO] [stderr]    |
[INFO] [stderr] 27 | pub struct Chain {
[INFO] [stderr]    |            ^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: multiple associated items are never used
[INFO] [stderr]    --> src/blockchain.rs:36:10
[INFO] [stderr]     |
[INFO] [stderr]  35 | impl Chain {
[INFO] [stderr]     | ---------- associated items in this implementation
[INFO] [stderr]  36 |   pub fn new(miner_addr: String, difficulty: u32) -> Chain {
[INFO] [stderr]     |          ^^^
[INFO] [stderr] ...
[INFO] [stderr]  48 |   pub fn new_transaction(&mut self, sender: String, reciever: String, amount: f32) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  57 |   pub fn last_hash(&self) -> String {
[INFO] [stderr]     |          ^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  65 |   pub fn update_difficulty(&mut self, difficulty: u32) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  70 |   pub fn update_reward(&mut self, reward: f32) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr]  75 |   pub fn generate_new_block(&mut self) -> bool {
[INFO] [stderr]     |          ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 110 |   pub fn get_merkle(curr_trans: Vec<Transaction>) -> String {
[INFO] [stderr]     |          ^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 134 |   pub fn proof_of_work(header: &mut BlockHeader) {
[INFO] [stderr]     |          ^^^^^^^^^^^^^
[INFO] [stderr] ...
[INFO] [stderr] 156 |   pub fn hash<T:serde::Serialize>(item: &T) -> String {
[INFO] [stderr]     |          ^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `blockchain` (bin "blockchain" test) generated 7 warnings
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.07s
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/blockchain-6c0f216af5f4cec5)
[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; finished in 0.00s
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "4bf3c9c1935b7f8c4615113b4865612e6c6ce01229375815cadcac4ee14e0783", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "4bf3c9c1935b7f8c4615113b4865612e6c6ce01229375815cadcac4ee14e0783", kill_on_drop: false }`
[INFO] [stdout] 4bf3c9c1935b7f8c4615113b4865612e6c6ce01229375815cadcac4ee14e0783