[INFO] updating cached repository https://github.com/jbradberry/mcts.rs
[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] 21f82d0d82b4b2e5b6eaf6cece1b0cd6930137b5
[INFO] checking jbradberry/mcts.rs against master#2748a9fd93dd1a00a4521f4f16de5befbf77f6cd for pr-62262-1
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2Fjbradberry%2Fmcts.rs" "/workspace/builds/worker-7/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-7/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/jbradberry/mcts.rs 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/jbradberry/mcts.rs
[INFO] finished tweaking git repo https://github.com/jbradberry/mcts.rs
[INFO] tweaked toml for git repo https://github.com/jbradberry/mcts.rs written to /workspace/builds/worker-7/source/Cargo.toml
[INFO] crate git repo https://github.com/jbradberry/mcts.rs already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+2748a9fd93dd1a00a4521f4f16de5befbf77f6cd" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-7/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] ff0347fe68c54ddfb6458f6bba9521a86f199fa439e8c34a38791bf005238725
[INFO] running `"docker" "start" "-a" "ff0347fe68c54ddfb6458f6bba9521a86f199fa439e8c34a38791bf005238725"`
[INFO] [stderr]    Compiling serde_derive v1.0.70
[INFO] [stderr]     Checking mcts v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused variable: `history`
[INFO] [stderr]    --> src/main.rs:189:46
[INFO] [stderr]     |
[INFO] [stderr] 189 |     fn is_legal(&self, action: &ChongAction, history: &[ChongState]) -> bool {
[INFO] [stderr]     |                                              ^^^^^^^ help: consider prefixing with an underscore: `_history`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `history`
[INFO] [stderr]    --> src/main.rs:209:29
[INFO] [stderr]     |
[INFO] [stderr] 209 |     fn legal_actions(&self, history: &[ChongState]) -> Vec<ChongAction> {
[INFO] [stderr]     |                             ^^^^^^^ help: consider prefixing with an underscore: `_history`
[INFO] [stderr] 
[INFO] [stderr] warning: method is never used: `build_state`
[INFO] [stderr]    --> src/main.rs:127:5
[INFO] [stderr]     |
[INFO] [stderr] 127 | /     fn build_state(pawn1: (u8, u8), pawn2: (u8, u8),
[INFO] [stderr] 128 | |                    stones1: &[(u8, u8)], stones2: &[(u8, u8)], next: u8) -> Self {
[INFO] [stderr] 129 | |         let pawn1 = ChongState::coordinate_mask(pawn1.0, pawn1.1);
[INFO] [stderr] 130 | |         let pawn2 = ChongState::coordinate_mask(pawn2.0, pawn2.1);
[INFO] [stderr] ...   |
[INFO] [stderr] 150 | |         }
[INFO] [stderr] 151 | |     }
[INFO] [stderr]     | |_____^
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(dead_code)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `history`
[INFO] [stderr]    --> src/main.rs:189:46
[INFO] [stderr]     |
[INFO] [stderr] 189 |     fn is_legal(&self, action: &ChongAction, history: &[ChongState]) -> bool {
[INFO] [stderr]     |                                              ^^^^^^^ help: consider prefixing with an underscore: `_history`
[INFO] [stderr]     |
[INFO] [stderr]     = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `history`
[INFO] [stderr]    --> src/main.rs:209:29
[INFO] [stderr]     |
[INFO] [stderr] 209 |     fn legal_actions(&self, history: &[ChongState]) -> Vec<ChongAction> {
[INFO] [stderr]     |                             ^^^^^^^ help: consider prefixing with an underscore: `_history`
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 14.41s
[INFO] running `"docker" "inspect" "ff0347fe68c54ddfb6458f6bba9521a86f199fa439e8c34a38791bf005238725"`
[INFO] running `"docker" "rm" "-f" "ff0347fe68c54ddfb6458f6bba9521a86f199fa439e8c34a38791bf005238725"`
[INFO] [stdout] ff0347fe68c54ddfb6458f6bba9521a86f199fa439e8c34a38791bf005238725