[INFO] cloning repository https://github.com/cheng404/simple-tcp-server-rs
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/cheng404/simple-tcp-server-rs" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 7871393efa99c8a85205340e69b3c7a6482279ec
[INFO] checking cheng404/simple-tcp-server-rs against try#3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f for pr-87248
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcheng404%2Fsimple-tcp-server-rs" "/workspace/builds/worker-15/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-15/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/cheng404/simple-tcp-server-rs on toolchain 3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/cheng404/simple-tcp-server-rs
[INFO] finished tweaking git repo https://github.com/cheng404/simple-tcp-server-rs
[INFO] tweaked toml for git repo https://github.com/cheng404/simple-tcp-server-rs written to /workspace/builds/worker-15/source/Cargo.toml
[INFO] crate git repo https://github.com/cheng404/simple-tcp-server-rs already has a lockfile, it will not be regenerated
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "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-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 8480eea0110b7554df95c745a69d1b55cc168a2083f730d36f8f99fe4f4bb0c4
[INFO] running `Command { std: "docker" "start" "-a" "8480eea0110b7554df95c745a69d1b55cc168a2083f730d36f8f99fe4f4bb0c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "8480eea0110b7554df95c745a69d1b55cc168a2083f730d36f8f99fe4f4bb0c4", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "8480eea0110b7554df95c745a69d1b55cc168a2083f730d36f8f99fe4f4bb0c4", kill_on_drop: false }`
[INFO] [stdout] 8480eea0110b7554df95c745a69d1b55cc168a2083f730d36f8f99fe4f4bb0c4
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-15/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" "+3e59a8c2f14152ccc92a6c079f592dc2dc6fa93f" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] 22dc713c732dce43dbdb21d63e735892f0cdcee45c11877efe86c0ce21c9b5d5
[INFO] running `Command { std: "docker" "start" "-a" "22dc713c732dce43dbdb21d63e735892f0cdcee45c11877efe86c0ce21c9b5d5", kill_on_drop: false }`
[INFO] [stderr]     Checking simple-tcp-server-rs v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: variant is never constructed: `Red`
[INFO] [stdout]  --> src/lesson4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Yellow`
[INFO] [stdout]  --> src/lesson4.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Yellow,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Green`
[INFO] [stdout]  --> src/lesson4.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Green
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Red`
[INFO] [stdout]  --> src/lesson4.rs:5:5
[INFO] [stdout]   |
[INFO] [stdout] 5 |     Red,
[INFO] [stdout]   |     ^^^
[INFO] [stdout]   |
[INFO] [stdout]   = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Yellow`
[INFO] [stdout]  --> src/lesson4.rs:6:5
[INFO] [stdout]   |
[INFO] [stdout] 6 |     Yellow,
[INFO] [stdout]   |     ^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: variant is never constructed: `Green`
[INFO] [stdout]  --> src/lesson4.rs:7:5
[INFO] [stdout]   |
[INFO] [stdout] 7 |     Green
[INFO] [stdout]   |     ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `sum_numbers`
[INFO] [stdout]   --> src/lesson4.rs:26:8
[INFO] [stdout]    |
[INFO] [stdout] 26 | pub fn sum_numbers(numbers: &[u32]) -> Option<u32> {
[INFO] [stdout]    |        ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_sharp_area`
[INFO] [stdout]   --> src/lesson4.rs:83:4
[INFO] [stdout]    |
[INFO] [stdout] 83 | fn print_sharp_area<T: Sharp>(sharp: T) -> f64 {
[INFO] [stdout]    |    ^^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 5 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 0.34s
[INFO] [stdout] warning: 3 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] running `Command { std: "docker" "inspect" "22dc713c732dce43dbdb21d63e735892f0cdcee45c11877efe86c0ce21c9b5d5", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "22dc713c732dce43dbdb21d63e735892f0cdcee45c11877efe86c0ce21c9b5d5", kill_on_drop: false }`
[INFO] [stdout] 22dc713c732dce43dbdb21d63e735892f0cdcee45c11877efe86c0ce21c9b5d5