[INFO] updating cached repository https://github.com/jk-gan/blockchain-rust
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 9ae8ac66358ffabd7bfc2a42fab1b966b4a61131
[INFO] checking jk-gan/blockchain-rust against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjk-gan%2Fblockchain-rust" "/workspace/builds/worker-1/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-1/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jk-gan/blockchain-rust on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/jk-gan/blockchain-rust
[INFO] finished tweaking git repo https://github.com/jk-gan/blockchain-rust
[INFO] tweaked toml for git repo https://github.com/jk-gan/blockchain-rust written to /workspace/builds/worker-1/source/Cargo.toml
[INFO] crate git repo https://github.com/jk-gan/blockchain-rust already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-1/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" "MAP_USER_ID=0" "-e" "CARGO_TARGET_DIR=/opt/rustwide/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/rustwide/cargo-home" "-e" "RUSTUP_HOME=/opt/rustwide/rustup-home" "-w" "/opt/rustwide/workdir" "-m" "1610612736" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 278fb9d9f6950ffced2d1aad7a8468116492e416f8c3dce735fe052e8ac9c96d
[INFO] running `"docker" "start" "-a" "278fb9d9f6950ffced2d1aad7a8468116492e416f8c3dce735fe052e8ac9c96d"`
[INFO] [stderr]    Compiling num-bigint v0.2.1
[INFO] [stderr]    Compiling ring v0.13.5
[INFO] [stderr]     Checking num-complex v0.2.1
[INFO] [stderr]     Checking num-iter v0.1.37
[INFO] [stderr]     Checking chrono v0.4.6
[INFO] [stderr]     Checking num-rational v0.2.1
[INFO] [stderr]     Checking num v0.2.0
[INFO] [stderr]     Checking blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: constant item is never used: `TARGER_BIT`
[INFO] [stderr]  --> src/proof_of_work.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | const TARGER_BIT: usize = 24;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ProofOfWork`
[INFO] [stderr]  --> src/proof_of_work.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct ProofOfWork {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/proof_of_work.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn new(block: Block) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: constant item is never used: `TARGER_BIT`
[INFO] [stderr]  --> src/proof_of_work.rs:5:1
[INFO] [stderr]   |
[INFO] [stderr] 5 | const TARGER_BIT: usize = 24;
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: struct is never constructed: `ProofOfWork`
[INFO] [stderr]  --> src/proof_of_work.rs:7:1
[INFO] [stderr]   |
[INFO] [stderr] 7 | struct ProofOfWork {
[INFO] [stderr]   | ^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `new`
[INFO] [stderr]   --> src/proof_of_work.rs:13:5
[INFO] [stderr]    |
[INFO] [stderr] 13 |     fn new(block: Block) -> Self {
[INFO] [stderr]    |     ^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 13.79s
[INFO] running `"docker" "inspect" "278fb9d9f6950ffced2d1aad7a8468116492e416f8c3dce735fe052e8ac9c96d"`
[INFO] running `"docker" "rm" "-f" "278fb9d9f6950ffced2d1aad7a8468116492e416f8c3dce735fe052e8ac9c96d"`
[INFO] [stdout] 278fb9d9f6950ffced2d1aad7a8468116492e416f8c3dce735fe052e8ac9c96d