[INFO] cloning repository https://github.com/Nukesor/collatz_conjecture
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/Nukesor/collatz_conjecture" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNukesor%2Fcollatz_conjecture", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNukesor%2Fcollatz_conjecture'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7b0b42fb3e53113b6bbac6e8f078fa45579e56a9
[INFO] checking Nukesor/collatz_conjecture against master#0599f3403366d9c57f0625e6de3af214b5042a90 for pr-87710
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FNukesor%2Fcollatz_conjecture" "/workspace/builds/worker-101/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-101/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Nukesor/collatz_conjecture on toolchain 0599f3403366d9c57f0625e6de3af214b5042a90
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/Nukesor/collatz_conjecture
[INFO] finished tweaking git repo https://github.com/Nukesor/collatz_conjecture
[INFO] tweaked toml for git repo https://github.com/Nukesor/collatz_conjecture written to /workspace/builds/worker-101/source/Cargo.toml
[INFO] crate git repo https://github.com/Nukesor/collatz_conjecture already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "fetch" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded sharded-slab v0.1.2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3b65a655d41cbfb1bf4adeca1a782fa41399a2b1d0d70a122b62caf339e9f1c4
[INFO] running `Command { std: "docker" "start" "-a" "3b65a655d41cbfb1bf4adeca1a782fa41399a2b1d0d70a122b62caf339e9f1c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3b65a655d41cbfb1bf4adeca1a782fa41399a2b1d0d70a122b62caf339e9f1c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3b65a655d41cbfb1bf4adeca1a782fa41399a2b1d0d70a122b62caf339e9f1c4", kill_on_drop: false }`
[INFO] [stdout] 3b65a655d41cbfb1bf4adeca1a782fa41399a2b1d0d70a122b62caf339e9f1c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-101/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" "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@sha256:34b6a614d2c27851fe6cbf88fbd1137609cefab8b10d0615aaeb6fd47975d74e" "/opt/rustwide/cargo-home/bin/cargo" "+0599f3403366d9c57f0625e6de3af214b5042a90" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 366c3f4a82f69b8beaa097e840837f02c8a5dbc7ce492b9fc3df98f0cef38adc
[INFO] running `Command { std: "docker" "start" "-a" "366c3f4a82f69b8beaa097e840837f02c8a5dbc7ce492b9fc3df98f0cef38adc", kill_on_drop: false }`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] [stderr]     Checking lazy_static v1.4.0
[INFO] [stderr]     Checking cfg-if v1.0.0
[INFO] [stderr]    Compiling unicode-xid v0.2.2
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[INFO] [stderr]    Compiling proc-macro2 v1.0.28
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[INFO] [stderr]     Checking color-spantrace v0.1.6
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[INFO] [stderr]     Checking collatz_conjecture v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `highest_sequential_number` is never read
[INFO] [stdout]   --> src/algorithms/hashset.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut highest_sequential_number = DEFAULT_MAX_PROVEN_NUMBER;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `highest_sequential_number` is never read
[INFO] [stdout]   --> src/algorithms/vector.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut highest_sequential_number = DEFAULT_MAX_PROVEN_NUMBER;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `highest_sequential_number` is never read
[INFO] [stdout]   --> src/algorithms/hashset.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut highest_sequential_number = DEFAULT_MAX_PROVEN_NUMBER;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `highest_sequential_number` is never read
[INFO] [stdout]   --> src/algorithms/vector.rs:19:13
[INFO] [stdout]    |
[INFO] [stdout] 19 |     let mut highest_sequential_number = DEFAULT_MAX_PROVEN_NUMBER;
[INFO] [stdout]    |             ^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 2 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1m 19s
[INFO] running `Command { std: "docker" "inspect" "366c3f4a82f69b8beaa097e840837f02c8a5dbc7ce492b9fc3df98f0cef38adc", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "366c3f4a82f69b8beaa097e840837f02c8a5dbc7ce492b9fc3df98f0cef38adc", kill_on_drop: false }`
[INFO] [stdout] 366c3f4a82f69b8beaa097e840837f02c8a5dbc7ce492b9fc3df98f0cef38adc