[INFO] cloning repository Catman155/four-in-a-row
[INFO] running `"git" "clone" "--bare" "git://github.com/Catman155/four-in-a-row.git" "work/cache/sources/gh/Catman155/four-in-a-row"`
[INFO] [stderr] Cloning into bare repository 'work/cache/sources/gh/Catman155/four-in-a-row'...
[INFO] running `"git" "clone" "work/cache/sources/gh/Catman155/four-in-a-row" "work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Catman155/four-in-a-row"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/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-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/gh/Catman155/four-in-a-row"`
[INFO] [stderr] Cloning into 'work/ex/pr-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "read-manifest" "--manifest-path" "Cargo.toml"`
[INFO] validating manifest of Catman155/four-in-a-row on toolchain try#8f81d0bf6baf07b92f1246696722485c4ca0b049
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-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-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/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-62008/sources/try#8f81d0bf6baf07b92f1246696722485c4ca0b049/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/ec2-user/crater/work/local/cargo-home/bin/cargo" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] running `"/mnt/big/ec2-user/crater/work/local/cargo-home/bin/cargo" "+8f81d0bf6baf07b92f1246696722485c4ca0b049-alt" "fetch" "--locked" "--manifest-path" "Cargo.toml"`
[INFO] checking Catman155/four-in-a-row against master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1 for pr-62008
[INFO] running `"docker" "create" "-v" "/mnt/big/ec2-user/crater/work/local/target-dirs/pr-62008/worker-3/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1:/opt/crater/target:rw,Z" "-v" "/mnt/big/ec2-user/crater/work/ex/pr-62008/sources/master#848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1/gh/Catman155/four-in-a-row:/opt/crater/workdir:ro,Z" "-v" "/mnt/big/ec2-user/crater/work/local/cargo-home:/opt/crater/cargo-home:ro,Z" "-v" "/mnt/big/ec2-user/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" "+848e0a23f34aaab3e4a974b031c86ef2a4e4fcc1-alt" "check" "--frozen" "--all" "--all-targets"`
[INFO] [stdout] 407b220fe0eb62554ef61fb48837adf23d751622a636aa7e859baee8aae74d05
[INFO] running `"docker" "start" "-a" "407b220fe0eb62554ef61fb48837adf23d751622a636aa7e859baee8aae74d05"`
[INFO] [stderr]     Blocking waiting for file lock on package cache
[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 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: 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: 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 7.41s
[INFO] running `"docker" "inspect" "407b220fe0eb62554ef61fb48837adf23d751622a636aa7e859baee8aae74d05"`
[INFO] running `"docker" "rm" "-f" "407b220fe0eb62554ef61fb48837adf23d751622a636aa7e859baee8aae74d05"`
[INFO] [stdout] 407b220fe0eb62554ef61fb48837adf23d751622a636aa7e859baee8aae74d05