[INFO] updating cached repository Catman155/four-in-a-row
[INFO] running `"git" "fetch" "--all"`
[INFO] [stdout] Fetching origin
[INFO] [stderr] From git://github.com/Catman155/four-in-a-row
[INFO] [stderr]  * branch            HEAD       -> FETCH_HEAD
[INFO] running `"git" "clone" "work/cache/sources/gh/Catman155/four-in-a-row" "work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Catman155/four-in-a-row"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Catman155/four-in-a-row'...
[INFO] [stderr] done.
[INFO] running `"git" "clone" "work/cache/sources/gh/Catman155/four-in-a-row" "work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Catman155/four-in-a-row"`
[INFO] [stderr] Cloning into 'work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Catman155/four-in-a-row'...
[INFO] [stderr] done.
[INFO] running `"git" "rev-parse" "HEAD"`
[INFO] [stdout] 057c1a1df18fea122ba7b7e0fc3731c2dc1b24c9
[INFO] sha for GitHub repo Catman155/four-in-a-row: 057c1a1df18fea122ba7b7e0fc3731c2dc1b24c9
[INFO] validating manifest of Catman155/four-in-a-row on toolchain master#e305df1846a6d985315917ae0c81b74af8b4e641
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Catman155/four-in-a-row on toolchain try#99a7498759a22b5684caf798a98b7e90ad9d2443
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] started frobbing Catman155/four-in-a-row
[INFO] finished frobbing Catman155/four-in-a-row
[INFO] frobbed toml for Catman155/four-in-a-row written to work/ex/pr-60039-1/sources/master#e305df1846a6d985315917ae0c81b74af8b4e641/gh/Catman155/four-in-a-row/Cargo.toml
[INFO] started frobbing Catman155/four-in-a-row
[INFO] finished frobbing Catman155/four-in-a-row
[INFO] frobbed toml for Catman155/four-in-a-row written to work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Catman155/four-in-a-row/Cargo.toml
[INFO] crate Catman155/four-in-a-row already has a lockfile, it will not be regenerated
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+e305df1846a6d985315917ae0c81b74af8b4e641-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/crater/work/local/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Catman155/four-in-a-row against try#99a7498759a22b5684caf798a98b7e90ad9d2443 for pr-60039-1
[INFO] running `"docker" "create" "-v" "/mnt/big/crater/work/local/target-dirs/pr-60039-1/worker-3/try#99a7498759a22b5684caf798a98b7e90ad9d2443:/opt/crater/target:rw,Z" "-v" "/mnt/big/crater/work/ex/pr-60039-1/sources/try#99a7498759a22b5684caf798a98b7e90ad9d2443/gh/Catman155/four-in-a-row:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/crater/work/local/rustup-home:/opt/crater/rustup-home:ro,Z" "-e" "USER_ID=1000" "-e" "SOURCE_DIR=/opt/crater/workdir" "-e" "MAP_USER_ID=1000" "-e" "CARGO_TARGET_DIR=/opt/crater/target" "-e" "CARGO_INCREMENTAL=0" "-e" "RUST_BACKTRACE=full" "-e" "RUSTFLAGS=--cap-lints=forbid" "-e" "CARGO_HOME=/opt/crater/cargo-home" "-e" "RUSTUP_HOME=/opt/crater/rustup-home" "-w" "/opt/crater/workdir" "-m" "1536M" "--network" "none" "rustops/crates-build-env" "/opt/crater/cargo-home/bin/cargo" "+99a7498759a22b5684caf798a98b7e90ad9d2443-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] edb7b608c9913bfcbb5cf6b34c2fc9cf2d47b2172218c9bd0d455aeec73a32b2
[INFO] running `"docker" "start" "-a" "edb7b608c9913bfcbb5cf6b34c2fc9cf2d47b2172218c9bd0d455aeec73a32b2"`
[INFO] [stderr]     Checking four_in_a_row v0.1.0 (/opt/crater/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: consider prefixing 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: consider prefixing 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]     Finished dev [unoptimized + debuginfo] target(s) in 0.75s
[INFO] running `"docker" "inspect" "edb7b608c9913bfcbb5cf6b34c2fc9cf2d47b2172218c9bd0d455aeec73a32b2"`
[INFO] running `"docker" "rm" "-f" "edb7b608c9913bfcbb5cf6b34c2fc9cf2d47b2172218c9bd0d455aeec73a32b2"`
[INFO] [stdout] edb7b608c9913bfcbb5cf6b34c2fc9cf2d47b2172218c9bd0d455aeec73a32b2