[INFO] cloning repository https://github.com/Liza-Maria/RustChain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Liza-Maria/RustChain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiza-Maria%2FRustChain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiza-Maria%2FRustChain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 6adb904c2ac2adbdd09102e0b493c9895b4294ee
[INFO] checking Liza-Maria/RustChain/6adb904c2ac2adbdd09102e0b493c9895b4294ee against master#31a9463c6e2794a59ce57a8f37abc6966afc2a58 for pr-156807
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FLiza-Maria%2FRustChain" "/workspace/builds/worker-4-tc1/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-4-tc1/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/Liza-Maria/RustChain
[INFO] finished tweaking git repo https://github.com/Liza-Maria/RustChain
[INFO] tweaked toml for git repo https://github.com/Liza-Maria/RustChain written to /workspace/builds/worker-4-tc1/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/Liza-Maria/RustChain on toolchain 31a9463c6e2794a59ce57a8f37abc6966afc2a58
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+31a9463c6e2794a59ce57a8f37abc6966afc2a58" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/Liza-Maria/RustChain 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" "+31a9463c6e2794a59ce57a8f37abc6966afc2a58" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+31a9463c6e2794a59ce57a8f37abc6966afc2a58" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] c285e1973a40e42729a10cbbc085ee81f941178722709d2735a80b8a8fd39070
[INFO] running `Command { std: "docker" "start" "-a" "c285e1973a40e42729a10cbbc085ee81f941178722709d2735a80b8a8fd39070", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "c285e1973a40e42729a10cbbc085ee81f941178722709d2735a80b8a8fd39070", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c285e1973a40e42729a10cbbc085ee81f941178722709d2735a80b8a8fd39070", kill_on_drop: false }`
[INFO] [stdout] c285e1973a40e42729a10cbbc085ee81f941178722709d2735a80b8a8fd39070
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-4-tc1/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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+31a9463c6e2794a59ce57a8f37abc6966afc2a58" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 3ff600c06e5f68163bb1dcb6a2b0108aedf0ee2af5f0ff36ef9038db87ba5cba
[INFO] running `Command { std: "docker" "start" "-a" "3ff600c06e5f68163bb1dcb6a2b0108aedf0ee2af5f0ff36ef9038db87ba5cba", kill_on_drop: false }`
[INFO] [stderr]    Compiling proc-macro2 v1.0.106
[INFO] [stderr]    Compiling quote v1.0.45
[INFO] [stderr]    Compiling serde_core v1.0.228
[INFO] [stderr]    Compiling num-traits v0.2.19
[INFO] [stderr]    Compiling serde_json v1.0.150
[INFO] [stderr]     Checking crypto-common v0.1.7
[INFO] [stderr]     Checking block-buffer v0.10.4
[INFO] [stderr]     Checking memchr v2.8.0
[INFO] [stderr]     Checking digest v0.10.7
[INFO] [stderr]     Checking sha2 v0.10.9
[INFO] [stderr]     Checking chrono v0.4.44
[INFO] [stderr]    Compiling syn v2.0.117
[INFO] [stderr]    Compiling serde_derive v1.0.228
[INFO] [stderr]     Checking serde v1.0.228
[INFO] [stderr]     Checking rustchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: unused import: `std::fmt::Debug`
[INFO] [stdout]  --> src/blockchain.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[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: `std::fmt::Debug`
[INFO] [stdout]  --> src/blockchain.rs:1:5
[INFO] [stdout]   |
[INFO] [stdout] 1 | use std::fmt::Debug;
[INFO] [stdout]   |     ^^^^^^^^^^^^^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_imports)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mine` is never used
[INFO] [stdout]   --> src/block.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Block {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn mine(&mut self, difficulty: usize) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `difficulty` is never read
[INFO] [stdout]  --> src/blockchain.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Blockchain {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 6 |     pub chain: Vec<Block>,
[INFO] [stdout] 7 |     pub difficulty: usize,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `mine` is never used
[INFO] [stdout]   --> src/block.rs:45:8
[INFO] [stdout]    |
[INFO] [stdout] 16 | impl Block {
[INFO] [stdout]    | ---------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 45 |     fn mine(&mut self, difficulty: usize) {
[INFO] [stdout]    |        ^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: field `difficulty` is never read
[INFO] [stdout]  --> src/blockchain.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 5 | pub struct Blockchain {
[INFO] [stdout]   |            ---------- field in this struct
[INFO] [stdout] 6 |     pub chain: Vec<Block>,
[INFO] [stdout] 7 |     pub difficulty: usize,
[INFO] [stdout]   |         ^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 13.93s
[INFO] running `Command { std: "docker" "inspect" "3ff600c06e5f68163bb1dcb6a2b0108aedf0ee2af5f0ff36ef9038db87ba5cba", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3ff600c06e5f68163bb1dcb6a2b0108aedf0ee2af5f0ff36ef9038db87ba5cba", kill_on_drop: false }`
[INFO] [stdout] 3ff600c06e5f68163bb1dcb6a2b0108aedf0ee2af5f0ff36ef9038db87ba5cba
