[INFO] updating cached repository https://github.com/ssttevee/rust-mcts-connect-four
[INFO] running `"git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "-c" "remote.origin.fetch=refs/heads/*:refs/heads/*" "fetch" "origin" "--force" "--prune"`
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] d09b9e4390457f868b1a414061365653ce75e2a2
[INFO] checking ssttevee/rust-mcts-connect-four against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fssttevee%2Frust-mcts-connect-four" "/workspace/builds/worker-2/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-2/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ssttevee/rust-mcts-connect-four on toolchain 2748a9fd93dd1a00a4521f4f16de5befbf77f6cd
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/ssttevee/rust-mcts-connect-four
[INFO] finished tweaking git repo https://github.com/ssttevee/rust-mcts-connect-four
[INFO] tweaked toml for git repo https://github.com/ssttevee/rust-mcts-connect-four written to /workspace/builds/worker-2/source/Cargo.toml
[INFO] crate git repo https://github.com/ssttevee/rust-mcts-connect-four already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-2/source/src/main.rs
[INFO] [stderr]     Blocking waiting for file lock on package cache
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-2/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" "MAP_USER_ID=0" "-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" "--network" "none" "rustops/crates-build-env" "/opt/rustwide/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] [stdout] 84e727ef97f7b3b15eb8efbd9f0809e50b76c86276be2788c64235e95725f594
[INFO] running `"docker" "start" "-a" "84e727ef97f7b3b15eb8efbd9f0809e50b76c86276be2788c64235e95725f594"`
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/rustwide/workdir/src/main.rs
[INFO] [stderr]     Checking numtoa v0.1.0
[INFO] [stderr]     Checking termion v1.5.3
[INFO] [stderr]     Checking connect-4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: function is never used: `player_move`
[INFO] [stderr]   --> src/cli.rs:23:1
[INFO] [stderr]    |
[INFO] [stderr] 23 | fn player_move<F: Fn(&Game) -> ()>(game: &mut Game, input: &mut io::Lines<io::StdinLock<'_>>, print_board: F) -> Result<(usize, usize), Done> {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `mcts_move`
[INFO] [stderr]   --> src/cli.rs:84:1
[INFO] [stderr]    |
[INFO] [stderr] 84 | fn mcts_move(game: &mut Game, mcts: &MCTS) -> (usize, usize) {
[INFO] [stderr]    | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `hbot_move`
[INFO] [stderr]    --> src/cli.rs:110:1
[INFO] [stderr]     |
[INFO] [stderr] 110 | fn hbot_move(game: &mut Game) -> (usize, usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_board_top`
[INFO] [stderr]    --> src/cli.rs:115:1
[INFO] [stderr]     |
[INFO] [stderr] 115 | fn print_board_top(cols: usize) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `print_board`
[INFO] [stderr]    --> src/cli.rs:119:1
[INFO] [stderr]     |
[INFO] [stderr] 119 | fn print_board(game: &Game, last_move: Option<(usize, usize)>) {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: enum is never used: `Opponent`
[INFO] [stderr]    --> src/cli.rs:129:1
[INFO] [stderr]     |
[INFO] [stderr] 129 | enum Opponent {
[INFO] [stderr]     | ^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `select_opponent`
[INFO] [stderr]    --> src/cli.rs:134:1
[INFO] [stderr]     |
[INFO] [stderr] 134 | fn select_opponent(input: &mut io::Lines<io::StdinLock<'_>>) -> Result<Opponent, Done> {
[INFO] [stderr]     | ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `start`
[INFO] [stderr]    --> src/cli.rs:182:1
[INFO] [stderr]     |
[INFO] [stderr] 182 | pub fn start() {
[INFO] [stderr]     | ^^^^^^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr] warning: function is never used: `main`
[INFO] [stderr]   --> src/main.rs:21:1
[INFO] [stderr]    |
[INFO] [stderr] 21 | fn main() {
[INFO] [stderr]    | ^^^^^^^^^
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 5.45s
[INFO] running `"docker" "inspect" "84e727ef97f7b3b15eb8efbd9f0809e50b76c86276be2788c64235e95725f594"`
[INFO] running `"docker" "rm" "-f" "84e727ef97f7b3b15eb8efbd9f0809e50b76c86276be2788c64235e95725f594"`
[INFO] [stdout] 84e727ef97f7b3b15eb8efbd9f0809e50b76c86276be2788c64235e95725f594