[INFO] cloning repository https://github.com/ericmeyers/collatz_rust
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ericmeyers/collatz_rust" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fericmeyers%2Fcollatz_rust", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fericmeyers%2Fcollatz_rust'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8f3182284f26896ecf06cc83cd82e0a4a05d5e85
[INFO] checking ericmeyers/collatz_rust against try#15e8bc6907ab2b3623cb52acc726f4787458df64 for pr-141352
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fericmeyers%2Fcollatz_rust" "/workspace/builds/worker-5-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-5-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ericmeyers/collatz_rust on toolchain 15e8bc6907ab2b3623cb52acc726f4787458df64
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/ericmeyers/collatz_rust
[INFO] finished tweaking git repo https://github.com/ericmeyers/collatz_rust
[INFO] tweaked toml for git repo https://github.com/ericmeyers/collatz_rust written to /workspace/builds/worker-5-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/ericmeyers/collatz_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" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] cc6d8d1f4d35bec655be61f62811bfb3bb033b5ae0b8d2fc351198f58cd541c5
[INFO] running `Command { std: "docker" "start" "-a" "cc6d8d1f4d35bec655be61f62811bfb3bb033b5ae0b8d2fc351198f58cd541c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "cc6d8d1f4d35bec655be61f62811bfb3bb033b5ae0b8d2fc351198f58cd541c5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "cc6d8d1f4d35bec655be61f62811bfb3bb033b5ae0b8d2fc351198f58cd541c5", kill_on_drop: false }`
[INFO] [stdout] cc6d8d1f4d35bec655be61f62811bfb3bb033b5ae0b8d2fc351198f58cd541c5
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-5-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:eea15d5475069c3ef791f10c2c6b5af2ee421ef2da1e680ecce1cba46243983b" "/opt/rustwide/cargo-home/bin/cargo" "+15e8bc6907ab2b3623cb52acc726f4787458df64" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 1e5663c3167129c33449860a1f9e73b01cfca11afbb84a10d9e1a98b819ba0ee
[INFO] running `Command { std: "docker" "start" "-a" "1e5663c3167129c33449860a1f9e73b01cfca11afbb84a10d9e1a98b819ba0ee", kill_on_drop: false }`
[INFO] [stderr]     Checking cfg-if v1.0.0
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[INFO] [stderr]     Checking tailcall v1.0.1
[INFO] [stderr]     Checking collatz_rust v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]     Checking ciborium v0.2.2
[INFO] [stderr]     Checking tinytemplate v1.2.1
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[INFO] [stdout] warning: unused variable: `ys`
[INFO] [stdout]  --> benches/my_benchmark.rs:7:9
[INFO] [stdout]   |
[INFO] [stdout] 7 |     let ys: Vec<_>   = xs.iter().map(|&n| collatz_length_brian(n)).collect();
[INFO] [stdout]   |         ^^ help: if this is intentional, prefix it with an underscore: `_ys`
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(unused_variables)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: unused variable: `ys`
[INFO] [stdout]   --> benches/my_benchmark.rs:13:9
[INFO] [stdout]    |
[INFO] [stdout] 13 |     let ys: Vec<_>   = xs.par_iter().map(|&n| collatz_length_brian(n)).collect();
[INFO] [stdout]    |         ^^ help: if this is intentional, prefix it with an underscore: `_ys`
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 25.04s
[INFO] running `Command { std: "docker" "inspect" "1e5663c3167129c33449860a1f9e73b01cfca11afbb84a10d9e1a98b819ba0ee", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "1e5663c3167129c33449860a1f9e73b01cfca11afbb84a10d9e1a98b819ba0ee", kill_on_drop: false }`
[INFO] [stdout] 1e5663c3167129c33449860a1f9e73b01cfca11afbb84a10d9e1a98b819ba0ee