[INFO] cloning repository https://github.com/captainzonks/Connect-4
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/captainzonks/Connect-4" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaptainzonks%2FConnect-4", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaptainzonks%2FConnect-4'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] 8baf8d31d1157bc2437b702cc631eb05a322594a
[INFO] checking captainzonks/Connect-4 against try#51b1964e35e5e26f8cd938940f0da6f7b5cc54fc for pr-138176
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fcaptainzonks%2FConnect-4" "/workspace/builds/worker-0-tc2/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-0-tc2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/captainzonks/Connect-4 on toolchain 51b1964e35e5e26f8cd938940f0da6f7b5cc54fc
[INFO] running `Command { std: CARGO_HOME="/workspace/cargo-home" RUSTUP_HOME="/workspace/rustup-home" "/workspace/cargo-home/bin/cargo" "+51b1964e35e5e26f8cd938940f0da6f7b5cc54fc" "metadata" "--manifest-path" "Cargo.toml" "--no-deps", kill_on_drop: false }`
[INFO] started tweaking git repo https://github.com/captainzonks/Connect-4
[INFO] finished tweaking git repo https://github.com/captainzonks/Connect-4
[INFO] tweaked toml for git repo https://github.com/captainzonks/Connect-4 written to /workspace/builds/worker-0-tc2/source/Cargo.toml
[INFO] crate git repo https://github.com/captainzonks/Connect-4 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" "+51b1964e35e5e26f8cd938940f0da6f7b5cc54fc" "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-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+51b1964e35e5e26f8cd938940f0da6f7b5cc54fc" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 3a3743231cbbde0d9e88cb4428bd072a6b623b8e6b4d4c5b19198cd82d049f0f
[INFO] running `Command { std: "docker" "start" "-a" "3a3743231cbbde0d9e88cb4428bd072a6b623b8e6b4d4c5b19198cd82d049f0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "3a3743231cbbde0d9e88cb4428bd072a6b623b8e6b4d4c5b19198cd82d049f0f", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "3a3743231cbbde0d9e88cb4428bd072a6b623b8e6b4d4c5b19198cd82d049f0f", kill_on_drop: false }`
[INFO] [stdout] 3a3743231cbbde0d9e88cb4428bd072a6b623b8e6b4d4c5b19198cd82d049f0f
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-tc2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-0-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@sha256:1680c8fbd8dfb46fcd6d22e546df16ab0e007457dc29fcd9e987cdd5077fd1af" "/opt/rustwide/cargo-home/bin/cargo" "+51b1964e35e5e26f8cd938940f0da6f7b5cc54fc" "check" "--frozen" "--all" "--all-targets" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] c6a66cb4c761cc1205e16f275d42120e59936eab4a30f55df5029fa09381d18d
[INFO] running `Command { std: "docker" "start" "-a" "c6a66cb4c761cc1205e16f275d42120e59936eab4a30f55df5029fa09381d18d", kill_on_drop: false }`
[INFO] [stderr]     Checking connect_4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: value assigned to `col` is never read
[INFO] [stdout]   --> src/main.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut col: usize = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `col` is never read
[INFO] [stdout]   --> src/main.rs:14:13
[INFO] [stdout]    |
[INFO] [stdout] 14 |     let mut col: usize = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout]    = note: `#[warn(unused_assignments)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `col` is never read
[INFO] [stdout]   --> src/main.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut col: usize = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: value assigned to `col` is never read
[INFO] [stdout]   --> src/main.rs:42:13
[INFO] [stdout]    |
[INFO] [stdout] 42 |     let mut col: usize = 0;
[INFO] [stdout]    |             ^^^
[INFO] [stdout]    |
[INFO] [stdout]    = help: maybe it is overwritten before being read?
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:125:11
[INFO] [stdout]     |
[INFO] [stdout] 125 |     while row >= 0 {
[INFO] [stdout]     |           ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: comparison is useless due to type limits
[INFO] [stdout]    --> src/main.rs:125:11
[INFO] [stdout]     |
[INFO] [stdout] 125 |     while row >= 0 {
[INFO] [stdout]     |           ^^^^^^^^
[INFO] [stdout]     |
[INFO] [stdout]     = note: `#[warn(unused_comparisons)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished `dev` profile [unoptimized + debuginfo] target(s) in 0.09s
[INFO] running `Command { std: "docker" "inspect" "c6a66cb4c761cc1205e16f275d42120e59936eab4a30f55df5029fa09381d18d", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "c6a66cb4c761cc1205e16f275d42120e59936eab4a30f55df5029fa09381d18d", kill_on_drop: false }`
[INFO] [stdout] c6a66cb4c761cc1205e16f275d42120e59936eab4a30f55df5029fa09381d18d