[INFO] cloning repository https://github.com/ultrasoya/tiny-blockchain
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ultrasoya/tiny-blockchain" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fultrasoya%2Ftiny-blockchain", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fultrasoya%2Ftiny-blockchain'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] dcca8605e52433a2f202dd175fc444827abf3812
[INFO] checking ultrasoya/tiny-blockchain against try#9961e55b3687a6d0b2bab4af0e5e81494b09be81 for pr-139087-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fultrasoya%2Ftiny-blockchain" "/workspace/builds/worker-7-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7-tc2/source'...
[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/ultrasoya/tiny-blockchain
[INFO] finished tweaking git repo https://github.com/ultrasoya/tiny-blockchain
[INFO] tweaked toml for git repo https://github.com/ultrasoya/tiny-blockchain written to /workspace/builds/worker-7-tc2/source/Cargo.toml
[INFO] validating manifest of git repo https://github.com/ultrasoya/tiny-blockchain on toolchain 9961e55b3687a6d0b2bab4af0e5e81494b09be81
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/ultrasoya/tiny-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" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "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] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 52d90b3c3be4361139772b2093269fe0bfccd67d0f1690de81b5c06579bde7c8
[INFO] running `Command { std: "docker" "start" "-a" "52d90b3c3be4361139772b2093269fe0bfccd67d0f1690de81b5c06579bde7c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "52d90b3c3be4361139772b2093269fe0bfccd67d0f1690de81b5c06579bde7c8", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "52d90b3c3be4361139772b2093269fe0bfccd67d0f1690de81b5c06579bde7c8", kill_on_drop: false }`
[INFO] [stdout] 52d90b3c3be4361139772b2093269fe0bfccd67d0f1690de81b5c06579bde7c8
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7-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:d429b63d4308055ea97f60fb1d3dfca48854a00942f1bd2ad806beaf015945ec" "/opt/rustwide/cargo-home/bin/cargo" "+9961e55b3687a6d0b2bab4af0e5e81494b09be81" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] f98298837e98cca343c8f0a7f28c205c6f48b410367133763aad865781589912
[INFO] running `Command { std: "docker" "start" "-a" "f98298837e98cca343c8f0a7f28c205c6f48b410367133763aad865781589912", kill_on_drop: false }`
[INFO] [stderr]     Checking tiny-blockchain v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: method `is_chain_valid` is never used
[INFO] [stdout]    --> src/blockchain.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout]  77 | impl Blockchain {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     pub fn is_chain_valid(&self, difficulty: usize) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: method `is_chain_valid` is never used
[INFO] [stdout]    --> src/blockchain.rs:107:12
[INFO] [stdout]     |
[INFO] [stdout]  77 | impl Blockchain {
[INFO] [stdout]     | --------------- method in this implementation
[INFO] [stdout] ...
[INFO] [stdout] 107 |     pub fn is_chain_valid(&self, difficulty: usize) -> bool {
[INFO] [stdout]     |            ^^^^^^^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(dead_code)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.12s
[INFO] running `Command { std: "docker" "inspect" "f98298837e98cca343c8f0a7f28c205c6f48b410367133763aad865781589912", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "f98298837e98cca343c8f0a7f28c205c6f48b410367133763aad865781589912", kill_on_drop: false }`
[INFO] [stdout] f98298837e98cca343c8f0a7f28c205c6f48b410367133763aad865781589912