[INFO] cloning repository https://github.com/nukopy/rust-tokio-understanding-asynchronous-and-green-thread
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/nukopy/rust-tokio-understanding-asynchronous-and-green-thread" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnukopy%2Frust-tokio-understanding-asynchronous-and-green-thread", kill_on_drop: false }`
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[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 08d6b07edded436a91256d15ce9f7a576914b6b5
[INFO] checking nukopy/rust-tokio-understanding-asynchronous-and-green-thread against master#ff647322379c48947c196639599067665ff9eb88 for pr-151539-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fnukopy%2Frust-tokio-understanding-asynchronous-and-green-thread" "/workspace/builds/worker-3-tc1/source", kill_on_drop: false }`
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[INFO] [stderr] done.
[INFO] started tweaking git repo https://github.com/nukopy/rust-tokio-understanding-asynchronous-and-green-thread
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[INFO] validating manifest of git repo https://github.com/nukopy/rust-tokio-understanding-asynchronous-and-green-thread on toolchain ff647322379c48947c196639599067665ff9eb88
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+ff647322379c48947c196639599067665ff9eb88" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] crate git repo https://github.com/nukopy/rust-tokio-understanding-asynchronous-and-green-thread already has a lockfile, it will not be regenerated
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[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/source:/opt/rustwide/workdir:ro,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-3-tc1/target:/opt/rustwide/target:rw,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" "-m" "1610612736" "--network" "none" "ghcr.io/rust-lang/crates-build-env/linux@sha256:3a6becf2bc8dde7f3fa57ede90e4f284e72d296796fc446bbb1e2c7cc0530151" "sleep" "infinity", kill_on_drop: false }`
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[INFO] [stdout] warning: unused variable: `runtime`
[INFO] [stdout]   --> examples/ex7_customize_tokio_rt.rs:15:9
[INFO] [stdout]    |
[INFO] [stdout] 15 |     let runtime = tokio::runtime::Builder::new_multi_thread()
[INFO] [stdout]    |         ^^^^^^^ help: if this is intentional, prefix it with an underscore: `_runtime`
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_variables)]` (part of `#[warn(unused)]`) on by default
[INFO] [stdout] 
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