[INFO] cloning repository https://github.com/ssttevee/rust-mcts-connect-four
[INFO] running `Command { std: "git" "-c" "credential.helper=" "-c" "credential.helper=/workspace/cargo-home/bin/git-credential-null" "clone" "--bare" "https://github.com/ssttevee/rust-mcts-connect-four" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fssttevee%2Frust-mcts-connect-four", kill_on_drop: false }`
[INFO] [stderr] Cloning into bare repository '/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fssttevee%2Frust-mcts-connect-four'...
[INFO] running `Command { std: "git" "rev-parse" "HEAD", kill_on_drop: false }`
[INFO] [stdout] d09b9e4390457f868b1a414061365653ce75e2a2
[INFO] documenting ssttevee/rust-mcts-connect-four against beta-2020-08-29 for beta-1.47-rustdoc-1
[INFO] running `Command { std: "git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fssttevee%2Frust-mcts-connect-four" "/workspace/builds/worker-9/source", kill_on_drop: false }`
[INFO] [stderr] Cloning into '/workspace/builds/worker-9/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/ssttevee/rust-mcts-connect-four on toolchain beta-2020-08-29
[INFO] running `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "read-manifest" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[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-9/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 `Command { std: "/workspace/cargo-home/bin/cargo" "+beta-2020-08-29" "fetch" "--locked" "--manifest-path" "Cargo.toml", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /workspace/builds/worker-9/source/src/main.rs
[INFO] [stderr]  Downloading crates ...
[INFO] [stderr]   Downloaded wasm-bindgen-macro v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-shared v0.2.48
[INFO] [stderr]   Downloaded bumpalo v2.5.0
[INFO] [stderr]   Downloaded serde v1.0.94
[INFO] [stderr]   Downloaded syn v0.15.39
[INFO] [stderr]   Downloaded rand_chacha v0.2.0
[INFO] [stderr]   Downloaded wasm-bindgen v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-macro-support v0.2.48
[INFO] [stderr]   Downloaded wasm-bindgen-backend v0.2.48
[INFO] [stderr]   Downloaded getrandom v0.1.6
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "metadata" "--no-deps" "--format-version=1", kill_on_drop: false }`
[INFO] [stdout] 58098c79a9d12967e7cf0d6c0c98f92af3c50c237c32397714e6cd4d6549baa2
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "58098c79a9d12967e7cf0d6c0c98f92af3c50c237c32397714e6cd4d6549baa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "inspect" "58098c79a9d12967e7cf0d6c0c98f92af3c50c237c32397714e6cd4d6549baa2", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "58098c79a9d12967e7cf0d6c0c98f92af3c50c237c32397714e6cd4d6549baa2", kill_on_drop: false }`
[INFO] [stdout] 58098c79a9d12967e7cf0d6c0c98f92af3c50c237c32397714e6cd4d6549baa2
[INFO] running `Command { std: "docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-9/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" "RUSTDOCFLAGS=--cap-lints=warn" "-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" "rustops/crates-build-env@sha256:d92eaeed33fa75130ca1ee6c8a01d1ffb62bac859dfdfb3450e3e5d1c0146529" "/opt/rustwide/cargo-home/bin/cargo" "+beta-2020-08-29" "doc" "--frozen" "--no-deps" "--document-private-items" "--message-format=json", kill_on_drop: false }`
[INFO] [stdout] b69561817af9f87e5556d69c542187a01a6dd7439ec98425cf55e691e2486add
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `Command { std: "docker" "start" "-a" "b69561817af9f87e5556d69c542187a01a6dd7439ec98425cf55e691e2486add", kill_on_drop: false }`
[INFO] [stderr] warning: file found to be present in multiple build targets: /opt/rustwide/workdir/src/main.rs
[INFO] [stderr]     Checking spin v0.5.0
[INFO] [stderr]    Compiling rand_chacha v0.2.0
[INFO] [stderr]     Checking termion v1.5.3
[INFO] [stderr]     Checking lazy_static v1.3.0
[INFO] [stderr]     Checking getrandom v0.1.6
[INFO] [stderr]     Checking c2-chacha v0.2.2
[INFO] [stderr]     Checking rand_core v0.5.0
[INFO] [stderr]     Checking rand v0.7.0
[INFO] [stderr]     Checking connect-4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr]  Documenting connect-4 v0.1.0 (/opt/rustwide/workdir)
[INFO] [stdout] warning: function is never used: `player_move`
[INFO] [stdout]   --> src/cli.rs:23:4
[INFO] [stdout]    |
[INFO] [stdout] 23 | fn player_move<F: Fn(&Game) -> ()>(game: &mut Game, input: &mut io::Lines<io::StdinLock<'_>>, print_board: F) -> Result<(usize, usize), D...
[INFO] [stdout]    |    ^^^^^^^^^^^
[INFO] [stdout]    |
[INFO] [stdout]    = note: `#[warn(dead_code)]` on by default
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `mcts_move`
[INFO] [stdout]   --> src/cli.rs:84:4
[INFO] [stdout]    |
[INFO] [stdout] 84 | fn mcts_move(game: &mut Game, mcts: &MCTS) -> (usize, usize) {
[INFO] [stdout]    |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `hbot_move`
[INFO] [stdout]    --> src/cli.rs:110:4
[INFO] [stdout]     |
[INFO] [stdout] 110 | fn hbot_move(game: &mut Game) -> (usize, usize) {
[INFO] [stdout]     |    ^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_board_top`
[INFO] [stdout]    --> src/cli.rs:115:4
[INFO] [stdout]     |
[INFO] [stdout] 115 | fn print_board_top(cols: usize) {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `print_board`
[INFO] [stdout]    --> src/cli.rs:119:4
[INFO] [stdout]     |
[INFO] [stdout] 119 | fn print_board(game: &Game, last_move: Option<(usize, usize)>) {
[INFO] [stdout]     |    ^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: enum is never used: `Opponent`
[INFO] [stdout]    --> src/cli.rs:129:6
[INFO] [stdout]     |
[INFO] [stdout] 129 | enum Opponent {
[INFO] [stdout]     |      ^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `select_opponent`
[INFO] [stdout]    --> src/cli.rs:134:4
[INFO] [stdout]     |
[INFO] [stdout] 134 | fn select_opponent(input: &mut io::Lines<io::StdinLock<'_>>) -> Result<Opponent, Done> {
[INFO] [stdout]     |    ^^^^^^^^^^^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `start`
[INFO] [stdout]    --> src/cli.rs:182:8
[INFO] [stdout]     |
[INFO] [stdout] 182 | pub fn start() {
[INFO] [stdout]     |        ^^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: function is never used: `main`
[INFO] [stdout]   --> src/main.rs:21:4
[INFO] [stdout]    |
[INFO] [stdout] 21 | fn main() {
[INFO] [stdout]    |    ^^^^
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stdout] warning: 9 warnings emitted
[INFO] [stdout] 
[INFO] [stdout] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 7.02s
[INFO] running `Command { std: "docker" "inspect" "b69561817af9f87e5556d69c542187a01a6dd7439ec98425cf55e691e2486add", kill_on_drop: false }`
[INFO] running `Command { std: "docker" "rm" "-f" "b69561817af9f87e5556d69c542187a01a6dd7439ec98425cf55e691e2486add", kill_on_drop: false }`
[INFO] [stdout] b69561817af9f87e5556d69c542187a01a6dd7439ec98425cf55e691e2486add