[INFO] updating cached repository https://github.com/Catman155/four-in-a-row
[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] 057c1a1df18fea122ba7b7e0fc3731c2dc1b24c9
[INFO] checking Catman155/four-in-a-row against try#e4dba30b9b475d8750370c4dfb49b6541990904d for pr-71393
[INFO] running `"git" "clone" "/workspace/cache/git-repos/https%3A%2F%2Fgithub.com%2FCatman155%2Ffour-in-a-row" "/workspace/builds/worker-11/source"`
[INFO] [stderr] Cloning into '/workspace/builds/worker-11/source'...
[INFO] [stderr] done.
[INFO] validating manifest of git repo https://github.com/Catman155/four-in-a-row on toolchain e4dba30b9b475d8750370c4dfb49b6541990904d
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started tweaking git repo https://github.com/Catman155/four-in-a-row
[INFO] finished tweaking git repo https://github.com/Catman155/four-in-a-row
[INFO] tweaked toml for git repo https://github.com/Catman155/four-in-a-row written to /workspace/builds/worker-11/source/Cargo.toml
[INFO] crate git repo https://github.com/Catman155/four-in-a-row already has a lockfile, it will not be regenerated
[INFO] running `"/workspace/cargo-home/bin/cargo" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"docker" "create" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/target:/opt/rustwide/target:rw,Z" "-v" "/var/lib/crater-agent-workspace/builds/worker-11/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" "+e4dba30b9b475d8750370c4dfb49b6541990904d" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 53c830e89dee2070f7ecbde9fab8451cb3ee02379f3de837f9b2cd194b5f1bdc
[INFO] [stderr] WARNING: Your kernel does not support swap limit capabilities or the cgroup is not mounted. Memory limited without swap.
[INFO] running `"docker" "start" "-a" "53c830e89dee2070f7ecbde9fab8451cb3ee02379f3de837f9b2cd194b5f1bdc"`
[INFO] [stderr]     Checking rprompt v1.0.3
[INFO] [stderr]     Checking four_in_a_row v0.1.0 (/opt/rustwide/workdir)
[INFO] [stderr] warning: unused import: `BOARD_SIZE`
[INFO] [stderr]  --> src/objects/ai.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use BOARD_SIZE;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused import: `BOARD_SIZE`
[INFO] [stderr]  --> src/objects/ai.rs:2:5
[INFO] [stderr]   |
[INFO] [stderr] 2 | use BOARD_SIZE;
[INFO] [stderr]   |     ^^^^^^^^^^
[INFO] [stderr]   |
[INFO] [stderr]   = note: `#[warn(unused_imports)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `direction`
[INFO] [stderr]   --> src/objects/ai.rs:19:17
[INFO] [stderr]    |
[INFO] [stderr] 19 |             let direction = self.get_possible_directions(positions);
[INFO] [stderr]    |                 ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_direction`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/objects/ai.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let mut possible = Vec::<[(i64, i64); 4]>::new();
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: unused variable: `direction`
[INFO] [stderr]   --> src/objects/ai.rs:19:17
[INFO] [stderr]    |
[INFO] [stderr] 19 |             let direction = self.get_possible_directions(positions);
[INFO] [stderr]    |                 ^^^^^^^^^ help: if this is intentional, prefix it with an underscore: `_direction`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_variables)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr] warning: variable does not need to be mutable
[INFO] [stderr]   --> src/objects/ai.rs:31:13
[INFO] [stderr]    |
[INFO] [stderr] 31 |         let mut possible = Vec::<[(i64, i64); 4]>::new();
[INFO] [stderr]    |             ----^^^^^^^^
[INFO] [stderr]    |             |
[INFO] [stderr]    |             help: remove this `mut`
[INFO] [stderr]    |
[INFO] [stderr]    = note: `#[warn(unused_mut)]` on by default
[INFO] [stderr] 
[INFO] [stderr] warning: 3 warnings emitted
[INFO] [stderr] 
[INFO] [stderr]     Finished dev [unoptimized + debuginfo] target(s) in 1.03s
[INFO] running `"docker" "inspect" "53c830e89dee2070f7ecbde9fab8451cb3ee02379f3de837f9b2cd194b5f1bdc"`
[INFO] running `"docker" "rm" "-f" "53c830e89dee2070f7ecbde9fab8451cb3ee02379f3de837f9b2cd194b5f1bdc"`
[INFO] [stdout] 53c830e89dee2070f7ecbde9fab8451cb3ee02379f3de837f9b2cd194b5f1bdc