[INFO] cloning repository https://github.com/fengshenjingjun/easy_blockchain_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/fengshenjingjun/easy_blockchain_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengshenjingjun%2Feasy_blockchain_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengshenjingjun%2Feasy_blockchain_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8ac43d3081e2dba002d55e827de36475e9854304
[INFO] testing fengshenjingjun/easy_blockchain_rust against beta-2025-09-21 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengshenjingjun%2Feasy_blockchain_rust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/fengshenjingjun/easy_blockchain_rust
[INFO] finished tweaking git repo https://github.com/fengshenjingjun/easy_blockchain_rust
[INFO] tweaked toml for git repo https://github.com/fengshenjingjun/easy_blockchain_rust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/fengshenjingjun/easy_blockchain_rust on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/fengshenjingjun/easy_blockchain_rust 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Updating crates.io index
[INFO] [stderr]     Blocking waiting for file lock on package cache
[ERROR] error running command: no output for 300 seconds
[INFO] testing fengshenjingjun/easy_blockchain_rust against beta-2025-09-21 for beta-1.91-2
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Ffengshenjingjun%2Feasy_blockchain_rust" "/workspace/builds/worker-3-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-3-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/fengshenjingjun/easy_blockchain_rust
[INFO] finished tweaking git repo https://github.com/fengshenjingjun/easy_blockchain_rust
[INFO] tweaked toml for git repo https://github.com/fengshenjingjun/easy_blockchain_rust written to /workspace/builds/worker-3-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/fengshenjingjun/easy_blockchain_rust on toolchain beta-2025-09-21
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/fengshenjingjun/easy_blockchain_rust 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" "+beta-2025-09-21" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded parking_lot_core v0.8.6
[INFO] [stderr]   Downloaded fxhash v0.2.1
[INFO] [stderr]   Downloaded instant v0.1.13
[INFO] [stderr]   Downloaded unty v0.0.4
[INFO] [stderr]   Downloaded bincode_derive v2.0.1
[INFO] [stderr]   Downloaded fs2 v0.4.3
[INFO] [stderr]   Downloaded virtue v0.0.18
[INFO] [stderr]   Downloaded crc32fast v1.5.0
[INFO] [stderr]   Downloaded bincode v2.0.1
[INFO] [stderr]   Downloaded sled v0.34.7
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 76f12c503e75787bcb49c00870b6a6c0b7b2bf5393d59c70e51bf7ea61be6956
[INFO] running `Command { std: "docker" "start" "-a" "76f12c503e75787bcb49c00870b6a6c0b7b2bf5393d59c70e51bf7ea61be6956", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "76f12c503e75787bcb49c00870b6a6c0b7b2bf5393d59c70e51bf7ea61be6956", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "76f12c503e75787bcb49c00870b6a6c0b7b2bf5393d59c70e51bf7ea61be6956", kill_on_drop: false }`
[INFO] [stdout] 76f12c503e75787bcb49c00870b6a6c0b7b2bf5393d59c70e51bf7ea61be6956
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "build" "--frozen" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] d1ce95121578ee3ade7c25b4e77d1feb33537a22462c60821f6c234222fbad71
[INFO] running `Command { std: "docker" "start" "-a" "d1ce95121578ee3ade7c25b4e77d1feb33537a22462c60821f6c234222fbad71", kill_on_drop: false }`
[INFO] [stderr]    Compiling autocfg v1.5.0
[INFO] [stderr]    Compiling cfg-if v1.0.3
[INFO] [stderr]    Compiling libc v0.2.175
[INFO] [stderr]    Compiling proc-macro2 v1.0.101
[INFO] [stderr]    Compiling unicode-ident v1.0.19
[INFO] [stderr]    Compiling parking_lot_core v0.8.6
[INFO] [stderr]    Compiling crossbeam-utils v0.8.21
[INFO] [stderr]    Compiling serde_core v1.0.225
[INFO] [stderr]    Compiling crc32fast v1.5.0
[INFO] [stderr]    Compiling smallvec v1.15.1
[INFO] [stderr]    Compiling scopeguard v1.2.0
[INFO] [stderr]    Compiling virtue v0.0.18
[INFO] [stderr]    Compiling serde v1.0.225
[INFO] [stderr]    Compiling byteorder v1.5.0
[INFO] [stderr]    Compiling log v0.4.28
[INFO] [stderr]    Compiling unty v0.0.4
[INFO] [stderr]    Compiling instant v0.1.13
[INFO] [stderr]    Compiling sha2 v0.10.9
[INFO] [stderr]    Compiling hex v0.4.3
[INFO] [stderr]    Compiling fxhash v0.2.1
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling lock_api v0.4.13
[INFO] [stderr]    Compiling bincode_derive v2.0.1
[INFO] [stderr]    Compiling crossbeam-epoch v0.9.18
[INFO] [stderr]    Compiling quote v1.0.40
[INFO] [stderr]    Compiling syn v2.0.106
[INFO] [stderr]    Compiling bincode v2.0.1
[INFO] [stderr]    Compiling fs2 v0.4.3
[INFO] [stderr]    Compiling num-integer v0.1.46
[INFO] [stderr]    Compiling parking_lot v0.11.2
[INFO] [stderr]    Compiling num-bigint v0.4.6
[INFO] [stderr]    Compiling sled v0.34.7
[INFO] [stderr]    Compiling serde_derive v1.0.225
[INFO] [stderr]    Compiling blockchain_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/block.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `new_coinbase_tx`
[INFO] [stdout]  --> src/cli.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/transaction.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stdout]  --> src/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::block_chain::Blockchain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/block_chain.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bc`
[INFO] [stdout]   --> src/cli.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/transaction.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         format!("Reward to {}", to);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/block.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `new_coinbase_tx`
[INFO] [stdout]  --> src/cli.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/transaction.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stdout]  --> src/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::block_chain::Blockchain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/block_chain.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bc`
[INFO] [stdout]   --> src/cli.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut cli = cli::CLI {};
[INFO] [stdout]   |         ----^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/cli.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl CLI {
[INFO] [stdout]   | -------- associated function in this implementation
[INFO] [stdout] 8 |     pub fn new() -> CLI {
[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 `TxInput` is never constructed
[INFO] [stdout]   --> src/transaction.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct TxInput {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/transaction.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         format!("Reward to {}", to);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 9.15s
[INFO] running `Command { std: "docker" "inspect" "d1ce95121578ee3ade7c25b4e77d1feb33537a22462c60821f6c234222fbad71", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "d1ce95121578ee3ade7c25b4e77d1feb33537a22462c60821f6c234222fbad71", kill_on_drop: false }`
[INFO] [stdout] d1ce95121578ee3ade7c25b4e77d1feb33537a22462c60821f6c234222fbad71
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen" "--no-run" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] fb26503cd6bfda7021c5dfe95a5686c5289a5e5350b4624ee4c2c78d14638a6d
[INFO] running `Command { std: "docker" "start" "-a" "fb26503cd6bfda7021c5dfe95a5686c5289a5e5350b4624ee4c2c78d14638a6d", kill_on_drop: false }`
[INFO] [stderr]    Compiling blockchain_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/block.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `new_coinbase_tx`
[INFO] [stdout]  --> src/cli.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/transaction.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stdout]  --> src/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::block_chain::Blockchain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/block_chain.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bc`
[INFO] [stdout]   --> src/cli.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/transaction.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         format!("Reward to {}", to);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/block.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `new_coinbase_tx`
[INFO] [stdout]  --> src/cli.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/transaction.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stdout]  --> src/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::block_chain::Blockchain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/block.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `new_coinbase_tx`
[INFO] [stdout]  --> src/cli.rs:3:26
[INFO] [stdout]   |
[INFO] [stdout] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stdout]   |                          ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `Serialize`
[INFO] [stdout]  --> src/transaction.rs:2:26
[INFO] [stdout]   |
[INFO] [stdout] 2 | use serde::{Deserialize, Serialize};
[INFO] [stdout]   |                          ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stdout]  --> src/transaction.rs:4:5
[INFO] [stdout]   |
[INFO] [stdout] 4 | use crate::block_chain::Blockchain;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/block_chain.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bc`
[INFO] [stdout]   --> src/cli.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `address`
[INFO] [stdout]   --> src/block_chain.rs:22:16
[INFO] [stdout]    |
[INFO] [stdout] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stdout]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `bc`
[INFO] [stdout]   --> src/cli.rs:13:13
[INFO] [stdout]    |
[INFO] [stdout] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stdout]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variable does not need to be mutable
[INFO] [stdout]  --> src/main.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let mut cli = cli::CLI {};
[INFO] [stdout]   |         ----^^^
[INFO] [stdout]   |         |
[INFO] [stdout]   |         help: remove this `mut`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: associated function `new` is never used
[INFO] [stdout]  --> src/cli.rs:8:12
[INFO] [stdout]   |
[INFO] [stdout] 7 | impl CLI {
[INFO] [stdout]   | -------- associated function in this implementation
[INFO] [stdout] 8 |     pub fn new() -> CLI {
[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 `TxInput` is never constructed
[INFO] [stdout]   --> src/transaction.rs:22:12
[INFO] [stdout]    |
[INFO] [stdout] 22 | pub struct TxInput {
[INFO] [stdout]    |            ^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/transaction.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         format!("Reward to {}", to);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused return value of `must_use` that must be used
[INFO] [stdout]   --> src/transaction.rs:60:9
[INFO] [stdout]    |
[INFO] [stdout] 60 |         format!("Reward to {}", to);
[INFO] [stdout]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] help: use `let _ = ...` to ignore the resulting value
[INFO] [stdout]    |
[INFO] [stdout] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stdout]    |         +++++++
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.84s
[INFO] running `Command { std: "docker" "inspect" "fb26503cd6bfda7021c5dfe95a5686c5289a5e5350b4624ee4c2c78d14638a6d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "fb26503cd6bfda7021c5dfe95a5686c5289a5e5350b4624ee4c2c78d14638a6d", kill_on_drop: false }`
[INFO] [stdout] fb26503cd6bfda7021c5dfe95a5686c5289a5e5350b4624ee4c2c78d14638a6d
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-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=warn" "-e" "RUSTDOCFLAGS=--cap-lints=warn" "-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:e90291280db7d1fac5b66fc6dad9f9662629e7365a55743daf9bdf73ebc4ea79" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2025-09-21" "test" "--frozen", kill_on_drop: false }`
[INFO] [stdout] b722a8fb126d99fac7e92e6780a83d2bb829088dec133efc4113018c7fda4c9c
[INFO] running `Command { std: "docker" "start" "-a" "b722a8fb126d99fac7e92e6780a83d2bb829088dec133efc4113018c7fda4c9c", kill_on_drop: false }`
[INFO] [stderr] warning: unused import: `Serialize`
[INFO] [stderr]  --> src/block.rs:2:26
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::{Deserialize, Serialize};
[INFO] [stderr]   |                          ^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `new_coinbase_tx`
[INFO] [stderr]  --> src/cli.rs:3:26
[INFO] [stderr]   |
[INFO] [stderr] 3 | use crate::transaction::{new_coinbase_tx, Transaction, TXInput, TxOutput};
[INFO] [stderr]   |                          ^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `Serialize`
[INFO] [stderr]  --> src/transaction.rs:2:26
[INFO] [stderr]   |
[INFO] [stderr] 2 | use serde::{Deserialize, Serialize};
[INFO] [stderr]   |                          ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `crate::block_chain::Blockchain`
[INFO] [stderr]  --> src/transaction.rs:4:5
[INFO] [stderr]   |
[INFO] [stderr] 4 | use crate::block_chain::Blockchain;
[INFO] [stderr]   |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `address`
[INFO] [stderr]   --> src/block_chain.rs:22:16
[INFO] [stderr]    |
[INFO] [stderr] 22 |     pub fn new(address: &str) -> Blockchain {
[INFO] [stderr]    |                ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_address`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `bc`
[INFO] [stderr]   --> src/cli.rs:13:13
[INFO] [stderr]    |
[INFO] [stderr] 13 |         let bc = Blockchain::create_blockchain(address);
[INFO] [stderr]    |             ^^ help: if this is intentional, prefix it with an underscore: `_bc`
[INFO] [stderr] 
[INFO] [stderr] warning: unused return value of `must_use` that must be used
[INFO] [stderr]   --> src/transaction.rs:60:9
[INFO] [stderr]    |
[INFO] [stderr] 60 |         format!("Reward to {}", to);
[INFO] [stderr]    |         ^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_must_use)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] help: use `let _ = ...` to ignore the resulting value
[INFO] [stderr]    |
[INFO] [stderr] 60 |         let _ = format!("Reward to {}", to);
[INFO] [stderr]    |         +++++++
[INFO] [stderr] 
[INFO] [stderr] warning: `blockchain_rust` (lib) generated 7 warnings (run `cargo fix --lib -p blockchain_rust` to apply 4 suggestions)
[INFO] [stderr] warning: `blockchain_rust` (lib test) generated 7 warnings (7 duplicates)
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]  --> src/main.rs:7:9
[INFO] [stderr]   |
[INFO] [stderr] 7 |     let mut cli = cli::CLI {};
[INFO] [stderr]   |         ----^^^
[INFO] [stderr]   |         |
[INFO] [stderr]   |         help: remove this `mut`
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_mut)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: associated function `new` is never used
[INFO] [stderr]  --> src/cli.rs:8:12
[INFO] [stderr]   |
[INFO] [stderr] 7 | impl CLI {
[INFO] [stderr]   | -------- associated function in this implementation
[INFO] [stderr] 8 |     pub fn new() -> CLI {
[INFO] [stderr]   |            ^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct `TxInput` is never constructed
[INFO] [stderr]   --> src/transaction.rs:22:12
[INFO] [stderr]    |
[INFO] [stderr] 22 | pub struct TxInput {
[INFO] [stderr]    |            ^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: `blockchain_rust` (bin "blockchain_rust" test) generated 10 warnings (7 duplicates) (run `cargo fix --bin "blockchain_rust" --tests` to apply 1 suggestion)
[INFO] [stderr]     Finished `test` profile [unoptimized + debuginfo] target(s) in 0.11s
[INFO] [stderr]      Running unittests src/lib.rs (/opt/rustwide/target/debug/deps/blockchain_rust-4d3ee9b79fe1a19e)
[INFO] [stderr]      Running unittests src/main.rs (/opt/rustwide/target/debug/deps/blockchain_rust-8d0acdc9be08a188)
[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] [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] [stderr]    Doc-tests blockchain_rust
[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" "b722a8fb126d99fac7e92e6780a83d2bb829088dec133efc4113018c7fda4c9c", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b722a8fb126d99fac7e92e6780a83d2bb829088dec133efc4113018c7fda4c9c", kill_on_drop: false }`
[INFO] [stdout] b722a8fb126d99fac7e92e6780a83d2bb829088dec133efc4113018c7fda4c9c
